JP2003319013A - Communication controller, communication system, and communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication controller for controlling between terminal devices that communicate through a network and connecting them, regardless of physical lines on the network side. <P>SOLUTION: A first communication interface 221 is connected to a communication device, and a second communication interface 222 is connected to a terminal device 23. A receive control unit 224a obtains a received signal, which is received by the communication device from a server 6, through the first communication interface 221, and a main control unit 226 controls the transmission of the received signal to the terminal device 23 through the second communication interface 222 on the basis of the control information. A transmission control unit 224b obtains a transmission signal from the terminal device 23 through the second communication interface 222, and the main control unit 226 controls the transmission of the transmission signal to the server 6 through the first communication interface 221 on the basis of the control information. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control device, a communication system and a communication method. In particular, the present invention relates to a communication control device, a communication system, and a communication method for controlling communication between a terminal device and a partner device such as a server with which the terminal device communicates via a network.

[0002]

2. Description of the Related Art Conventionally, there has been a communication system using an ISDN communication network as a communication system using a communication control device. FIG. 19 is an explanatory diagram showing the configuration of a conventional communication system 601. As shown in FIG. 19, a conventional communication system 601 is installed in a subscriber premises system 602, a two-core metallic cable 603 which is a physical line for connecting the subscriber premises system 602 to the network side, and an exchange. It was composed of a line accommodation device 604 accommodating the two-core metallic cable 603, an ISDN communication network 605, and a plurality of servers 606.

A subscriber home system 602 includes a communication control device 621, a DSU (Digital Service Unit) 622, a terminal device 623 such as a personal computer for communicating with a partner device such as the server 6, and a subscriber. An alarm terminal device 624 that detects an abnormality in the house and notifies the server 6 of an emergency, a communication control device 621, and a DSU 62
2 core metallic cable 625 connecting 2 and DS
It was composed of a 4-core metallic cable 626 connecting the U 622 and the terminal device 623, and a cable 627 connecting the communication control device 621 and the alarm terminal device 624.

The communication control device 621 includes a line accommodation device 604 on the network side and a D in the subscriber home system 602.
It was provided at a point U between SU622 and connected to each other. The communication control device 621 mainly monitors the D channel and relays the communication between the line accommodation device 604 and the DSU 622. Communication system 60 using ISDN communication network
1, the transmission rate at point U is 320 kbit / s,
16 kb depending on the transmission speed of D channel that is mainly monitored
It / s, the communication speed was lower than that of the IP communication network and the like, and the control was easy. Also, the communication control device 621
Was also connected to the alarm terminal device 624. for that reason,
The alarm terminal device 624 includes a communication control device 621 between the terminal device 623 and the network side line accommodation device 604.
Was able to connect through.

On the other hand, no communication system using an IP (Internet Protocol) communication network uses a communication control device like the ISDN communication network. Therefore, like the communication system 601, the alarm terminal device 624 is provided between the terminal device 623 and the network side line accommodation device 604.
Was unable to connect and control. Therefore, if you want to build a communication system that includes an alarm terminal,
An alarm terminal device is directly connected to a terminal device such as a personal computer, or a terminal device such as a personal computer having a function as an alarm terminal device is used. Such a terminal device uses PPP (Point to Point Protocol) for mutual communication between points or PPP as a communication protocol for establishing a data link.
I was using oE (PPP over Ethernet).

20 to 22 are explanatory views showing the structure of a communication protocol of a communication system using a conventional IP communication network. 20 shows a case where the terminal device 701 is connected to an IP communication network via a bridge type ONU (Optical Network Unit) 702a, and FIG. 21 is a case where the terminal device 701 is a bridge type xDSL (xDigitalSub).
22 is a case of connecting to an IP communication network via a subscriber line (modem) 702b. In FIG. 22, the terminal device 701 is a bridge type CATV (Community Antenna Televisio).
n) A case of connecting to the IP communication network via the modem 702c. FIG. 23 is a sequence diagram showing a procedure of a communication method in a communication system using a conventional IP communication network. In FIG. 23, the terminal device 701 has a bridge type ONU 702a, an xDSL modem 702b, and a CATV.
The figure shows the case of connecting to the IP communication network via any of the modems 702c.

As shown in FIGS. 20 to 22, the terminal device 7
01 is ONU 702a, xDSL modem 702b, C
I was connected to the ATV modem 702c using a 10 / 100BASE-T cable and Ethernet. or,
The ONU 702a, the xDSL modem 702b, and the CATV modem 702c are the network side line accommodation device 703.
a, 703b and the head end 703c are connected using the ATM layer, and the server 704 is connected using the bridge and AAL5. Then, the terminal device 701 displays P
A data link is directly established and connected to the server 704 on the network side by using PP or PPPoE, and the IP layer or TCP (Transmission Control) included in the IP packet is connected.
Communication was performed using the control information of the rol Protocol) layer.

As shown in FIG. 23, the procedure of the communication method is as follows. First, the ONU 702a, the xDSL modem 702b,
CATV modem 702c and line accommodating devices 703a, 70
3b and the head end 703c, the line accommodation device 7
03a, 703b, head end 703c, and server 70
4 and each connect using the ATM layer (S70).
1). Next, the terminal device 701, ONU 702a, xDS
L modem 702b and CATV modem 702c are turned on
U702a, xDSL modem 702b, CATV modem 702c and server 704 are respectively in Ethernet
t (registered trademark) (Ethernet (registered trademark)), AAL
5 / Connect using bridge (S702). Finally, the terminal device 701 and the server 704 are the PPPoE,
A data link is established using PPP and a direct connection is made (S703), (S704). Then, the terminal device 701
Uses the control information of the IP layer and the TCP layer included in the IP packet to directly transmit / receive the IP packet to / from the server 704 for communication (S705).

Also, a bridge type xDSL modem 70
2b, etc., and router type xDSL modem 802
The communication system using is also used. FIG. 24 is an explanatory diagram showing a configuration of a communication protocol of another communication system using the conventional IP communication network. FIG. 24 shows a case where the terminal device 801 is connected to the IP communication network via the router type xDSL modem 802. Figure 25
FIG. 6 is a sequence diagram showing a procedure of a communication method in another communication system using the conventional IP communication network. Note that FIG. 25 shows a case where the terminal device 801 is connected to the IP communication network via the router type xDSL modem 802.

As shown in FIG. 24, the terminal device 801 is
The xDSL modem 802 was connected via a 10 / 100BASE-T cable and Ethernet, and the xDSL modem 802 established a data link with the server 704 on the network side by using PPPoE and PPP. Then, the xDSL modem 802 communicates with the server 704 using the control information of the IP layer included in the IP packet.

In the procedure of the communication method, as shown in FIG. 25, first, steps (S801) and (S802) similar to steps (S701) and (S702) are performed. Next, the xDSL modem 802 and the server 704 make the PPP
A data link is established and connected using oE and PPP (S803, S804). Then, the terminal device 801
Can connect to the server 704 and IP via the xDSL modem 802.
Packets are transmitted and received (S805) and (S806).
At this time, the xDSL modem 802 uses the control information of the IP layer included in the IP packet to communicate with the server 704 and the IP.
They were sending and receiving packets and communicating.

[0012]

However, in the conventional communication system using the IP communication network, the terminal device 70 is used.
1 and the server 704, the communication control device 621 such as the communication system 601 using the ISDN communication network did not exist. Further, when the terminal device 701 is connected to the IP communication network via the bridge type ONU 702a, xDSL modem 702b, and CATV modem 702c,
The terminal device 701 and the server 704 are PPPoE, PPP
The terminal device 701 and the server 704 establish a data link and establish a data link, and directly connect to each other to perform communication. Therefore, the terminal device 70
1 and the server 704, the ONU 702a, the xDSL modem 702b, and the CATV modem 702c exist, but they are the IP layer and TCP included in the IP packet.
Looking at the layer control information, the communication between the terminal device 701 and the server 704 could not be controlled.

The terminal device 801 is a router type xD.
When connecting to the IP communication network via the SL modem 802, the xDSL modem 802 and the server 704 use the PPPo
E and PPP were used to establish a data link for communication. Therefore, although the xDSL modem 802 existing between the terminal device 801 and the server 704 can see the control information of the IP layer included in the IP packet, it can only perform a very basic routing process. Therefore, the xDSL modem 802 cannot control the communication performed between the terminal device 801 and the server 704, and cannot see the control information of the TCP layer.

Therefore, in the conventional communication system using the IP communication network, the terminal devices 701 and 801 and the server 704 are provided.
However, there is a problem in that it is not possible to control communication between the other device and the like. Especially ONU702
In the case of optical communication using a, the maximum communication speed at present is about 100 Mbit / s, xDSL modem 702b, C
When using the ATV modem 702c, the communication speed is extremely high at the maximum of about 10 Mbit / s at present,
It has been very difficult to control by looking at the contents of information communicated between the terminal device and the partner device. Furthermore, between the terminal devices 701 and 801 and the network side line accommodating devices 703a and 703b and the head end 703c,
There is a problem that other terminal devices such as an alarm terminal device cannot be connected and controlled.

Further, in order to solve the above problems, a conventional ISDN has been added to a conventional communication system using an IP communication network.
It is possible to apply the communication control device 621 of the communication system 601 using the communication network 605. However, similar to the communication system 601, the line accommodation device 604 on the network side and the DS of the subscriber home system 602
The communication control device 621 is provided at a position corresponding to U622.
Connection, that is, the line accommodating device 703a on the network side and the ON provided on the terminal device 701 side.
Between the U702a and the network side line accommodation device 70
3b and the xDSL modem 702b provided on the terminal device 701 side, and the network side headend 703.
c and the CATV modem 7 provided on the terminal device 701 side
If you try to connect a communication control device with 02c,
The following problems arose.

As shown in FIG. 20, the line accommodation device 703.
The physical layer connecting a and the ONU 702a is an optical fiber. On the other hand, the physical layer connecting the line accommodation device 703b and the xDSL modem 702b is a two-core metallic cable as shown in FIG. Furthermore, the head end 7
The physical layer connecting 03c and the CATV modem 702c is a coaxial cable as shown in FIG. In this way, the network side line accommodating devices 703a and 703b
The head end 703c, the ONU 702a, the xDSL modem 702b, and the CA that are provided on the terminal device 701 side and are connected to the IP communication network to transmit and receive signals to and from the server 704.
The physical layer for connecting to a communication device such as the TV modem 702c differs depending on the type of the communication device. Incidentally, the physical layer is not limited to the wired one, and may be a wireless one.

Therefore, the communication control device is installed in the terminal device 70.
In order to connect between 1,801 and the server 704,
Communication devices such as the ONU 702a, the xDSL modem 702b, and the CATV modem 702c, and the line accommodation device 703a,
It is necessary to prepare a communication control device having a physical layer suitable for each type of physical line for each physical line on the network side that connects devices on the network side such as 703b and head end 703c. That is, it is necessary to prepare a communication control device having a communication protocol whose physical layer is completely different for each physical line on the network side.

Therefore, according to the present invention, the communication between the terminal device and the partner device with which the terminal device communicates via the network can be controlled between the two, and is not affected by the physical line on the network side. It is an object of the present invention to provide a communication control device that can be connected to a network, a communication system using the communication control device, and a communication method. Further, another invention is to provide a communication control device capable of connecting and controlling another terminal device between the terminal device and a network, a communication system using the communication control device, and a communication method. To aim.

[0019]

A communication system according to the present invention is a communication system for controlling communication between a terminal device and a partner device with which the terminal device communicates via a network. A communication device provided on the terminal device side and connected to a network for transmitting and receiving signals to and from a partner device, and a communication control device provided between the terminal device and the communication device to control communication between the terminal device and the partner device. With.

The communication control apparatus according to the present invention controls the communication between the first communication interface section connected to the communication apparatus, the second communication interface section connected to the terminal apparatus, and the terminal apparatus and the partner apparatus. And a communication control unit for controlling the communication. Further, the communication control unit acquires a reception signal received by the communication device from the partner device via the first communication interface unit, and a transmission signal transmitted from the terminal device via the second communication interface unit. Based on the control information included in the received signal, the transmission of the received signal to the terminal device via the second communication interface unit is controlled, and based on the control information included in the transmitted signal, It is characterized by controlling transmission to the partner device via the first communication interface unit. According to such a communication system and communication control device, the first communication interface unit connects to the communication device, and the second communication interface unit connects to the terminal device. Therefore, the communication control device includes the terminal device and the communication device. Can be connected between. Therefore, the communication control device can be connected without being affected by the physical line on the network side.

Further, the communication control unit acquires the reception signal received by the communication device from the partner device via the first communication interface unit, and based on the control information included in the reception signal, the second reception signal. Control the transmission to the terminal device via the communication interface unit. Further, the communication control unit acquires the transmission signal transmitted from the terminal device via the second communication interface unit, and determines the first communication interface unit of the transmission signal based on the control information included in the transmission signal. Control the transmission to the other device via the.

Therefore, the communication control device is provided with the first communication interface section and the second communication interface section, so that the terminal control unit and the partner apparatus are connected so as to interrupt each other, and the terminal unit and the communication control unit are connected. It is possible to perform control such as acquisition of a transmission signal and transmission of a reception signal between the communication control device and the communication device, and control of acquisition of a reception signal and transmission of the transmission signal between the communication control device and the partner device. That is, the communication control device can individually and independently control the communication between the terminal device and the communication control device and the communication between the communication control device and the partner device. Therefore, the communication control device can control the communication between the terminal device and the partner device between them. or,
In this way, the communication control device can independently control communication between the terminal device and the communication control device and communication between the communication control device and the partner device, so that the communication speed is high. However, it is possible to control it sufficiently.

Further, the communication control section generates a signal addressed to the partner device addressed to the partner device, and based on the control information included in the signal addressed to the partner device and the control information included in the transmission signal, the signal addressed to the partner device and It is preferable to control the transmission of the transmission signal to the partner device via the first communication interface unit. According to this, the communication control device itself can generate a signal addressed to the partner device. Further, the communication control unit controls the transmission to the partner device based on the control information included in the signal addressed to the partner device and the transmission signal, so that the signal addressed to the partner device by the communication control device itself and the terminal device It is possible to control the transmission of the transmission signal addressed to the device to the partner device.

Further, the communication control device is provided with a third communication interface unit for connecting to a terminal device other than the terminal device, and the communication control unit extracts information required by the other terminal device from the received signal. , It is preferable to transmit to another terminal device via the third communication interface unit. According to this, the communication control device is connected between the terminal device and the communication device, and by including the third communication interface, it is possible to connect another terminal device between the terminal device and the network. it can. Then, the communication control unit can control the other terminal device by extracting the information required by the other terminal device from the received signal and transmitting the information to the second terminal device.

Further, the communication control unit acquires information from another terminal device via the third communication interface unit, generates a signal addressed to the partner device based on the acquired information, and outputs the signal addressed to the partner device. It is preferable to control the transmission of the signal addressed to the partner device and the transmission signal to the partner device via the first communication interface unit based on the control information contained in the control information and the control information contained in the transmission signal.

According to this, the communication control unit can acquire information from another terminal device and generate a signal addressed to the partner device based on the acquired information. Then, the communication control unit controls the transmission to the partner device based on the control information included in the partner device signal and the transmission signal,
Based on the information acquired from the other terminal device, the communication control device can control the transmission of the signal addressed to the partner device and the transmission signal addressed by the terminal device to the partner device to the partner device. Further, the information acquired from another terminal device can be notified to the partner device.

Further, it is preferable that the communication control section performs control by using the control information of the IP layer as the control information. According to this, it is possible to transmit a transmission signal, a reception signal, or a signal addressed to the partner device based on the destination address and the source address included in the IP layer control information, the information indicating the priority such as the service type and the traffic class, and the like. It becomes possible to control.

Further, the communication control unit uses TCP as control information.
Control may be performed using layer control information. According to this, a transmission signal, a reception signal, a signal addressed to the partner device, based on information indicating whether or not the destination port number and the source port number included in the control information of the TCP layer include emergency data such as a flag, and the like. It becomes possible to control the transmission of. Furthermore, since the TCP layer is a higher layer than the IP layer, it is possible to perform finer control of a higher level.

Further, it is preferable that the communication control section establishes a data link between the terminal device and the communication control device and a data link between the communication control device and the partner device. According to this, the communication control device can take a form in which a data link is established with the terminal device and the communication control device and the terminal device are directly connected. Similarly, the communication control device can take a form in which a data link is established with the partner device and the communication control device and the partner device are directly connected. Therefore, in such a form, the communication control device can independently control communication between the terminal device and the communication control device and communication between the communication control device and the partner device.

Further, when the communication device establishes a data link with the partner device, the communication control unit controls the data link between the terminal device and the communication control device and between the communication control device and the communication device. It is preferable to establish a data link.
According to this, since the communication device establishes the data link with the partner device, the communication control unit establishes the data link with the communication device and transmits the transmission signal to the partner device. It may be controlled and transmitted to the communication device. As a result, the transmission signal controlled by the communication control unit is transmitted from the communication device to the partner device, and the communication control device controls the communication between the terminal device and the partner device between the terminal device and the partner device. it can.

Further, the communication control unit transmits the received signal to the second communication interface without changing the source MAC (Media Access Control) address and the destination MAC address of the control information included in the received signal. To the terminal device via the communication unit and transmits the transmission signal to the partner device via the first communication interface unit without changing the source MAC address and the destination MAC address of the control information included in the transmission signal. It is preferable. According to this
The communication control device can relay a transmission signal or a reception signal at the MAC sublayer level without using a MAC address unique to the communication control device existing between the terminal device and the partner device.

Further, a line for connecting the terminal device and the communication device without using the first communication interface unit and the second communication interface unit, and a connection destination of the communication device for the first communication interface unit and the line. Between the second communication interface unit and the line to switch the connection destination of the terminal device, an abnormality detection unit for detecting an abnormal state of the communication control device, and a detection result of the abnormality detection unit. Based on the above, it is preferable to include a switching control unit that controls the switching unit.

According to this, when an abnormality occurs in the communication control device, the abnormality detection unit detects the abnormal state of the communication control device, and the switching control unit controls the switching unit based on the detection result. . The switching unit, under the control of the switching control unit, connects a connection destination of the terminal device or the communication device without using the first communication interface unit and the second communication interface unit, and the first communication interface unit. And the second communication interface unit. Therefore, even if some abnormality occurs in the communication control device, the terminal device and the communication device can be connected via the line to continue the communication between the terminal device and the partner device.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

[Configuration of Communication System] FIG. 1 is an explanatory diagram showing a configuration of a communication system 1a according to the embodiment of the present invention, and FIG. 2 is another communication system 1b according to the embodiment of the present invention. FIG. 3 is an explanatory diagram showing the configuration of FIG. 3, and FIG. 3 is an explanatory diagram showing the configuration of still another communication system 1c according to the embodiment of the present invention. First, the communication system 1a will be described. As shown in FIG. 1, the communication system 1a includes a subscriber premise system 2a, an optical fiber 3a, a line accommodation device 4a, an IP communication network 5, and a plurality of servers 6. In addition, the subscriber home system 2a is the ONU 21a.
, Communication control device 22, terminal device 23, alarm terminal device 24, 10 / 100BASE-T cable 251,
252 and a cable 26. In the communication system 1a, the subscriber premises system 2a to the IP communication network 5
Use a fiber optic network to connect to.

Next, the configuration on the network side will be described. The optical fiber 3a is a physical line for connecting the subscriber home system 2a to the IP communication network 5. The line accommodating device 4a is installed at an exchange or the like, and the optical fiber 3
It is a line accommodation device that accommodates a. IP communication network is IP
It is a network that communicates according to (Internet Protocol). The server 6 is a partner device with which the terminal device of the subscriber home system 2a communicates via a network such as the IP communication network 5. As the server 6, for example, a PPP server or the like can be used. Server 6
Is provided by a provider (telecommunication carrier), a security company, or the like. Here, the server 6 obtains information from the alarm terminal device 24 installed in the subscriber's house, gives an instruction to the alarm terminal device 24 based on the information, and causes a fire in the subscriber's house or intrusion of a suspicious person. It is responsible for a part of the security service that discovers etc. and protects the subscriber's home. Server 6
For example, the alarm terminal device is instructed to transmit images inside the subscriber's home, switch surveillance cameras installed in the subscriber's home, and confirm a predetermined situation. The partner device with which the terminal device communicates via a network such as the IP communication network 5 is not limited to the server 6 and may be a terminal device or the like used by an individual user.

Next, the subscriber home system 2a will be described. The subscriber home system 2a is a system provided in the home of a subscriber who subscribes to a communication service such as an optical fiber network. The ONU 21a is a communication device which is provided on the side of the terminal device 23 used by the subscriber and which is connected to a network such as the IP communication network 5 and transmits / receives a signal to / from the server 6 which is a partner device. One of the ONUs 21a is connected to the optical fiber 3a, and is connected to the IP communication network 5 via the optical fiber network. The ONU 21a is an optical network termination device provided on the side of the terminal device 23 in the optical fiber network. The other of ONU21a is 10 / 100BASE-T
It is connected to the cable 251 and is connected to the communication control device 22 via the 10 / 100BASE-T cable 251.

The ONU 21a includes an optical fiber 3a and an IP.
The signal transmitted from the server 6 is received via the communication network 5, and the signal transmitted from the communication control device 22 is transmitted to the server 6. The ONU 21a performs E / O conversion such as converting an electric signal into an optical signal or converting an optical signal into an electric signal. Therefore, the ONU 21a converts the received optical signal into an electric signal, transmits the electric signal to the communication control device 22, converts the electric signal transmitted from the communication control device 22 into an optical signal, and transmits the optical signal to the optical fiber 3a. Further, in the present embodiment, the ONU 21a uses a bridge type that connects one terminal device.

The communication control device 22 controls the communication between the terminal device 23 and the server 6 which is a partner device with which the terminal device 23 communicates via the IP communication network 5. Communication control device 22
One of them is connected to the 10 / 100BASE-T cable 251, and is connected to the ONU 21a via the 10 / 100BASE-T cable 251. The other side of the communication control device 22 is connected to the 10 / 100BASE-T cable 252, and is connected to the terminal device 23 via the 10 / 100BASE-T cable 252. The terminal device 23 is a terminal device used by the subscriber, and for example, a personal computer or the like can be used. The terminal device 23 communicates with the server 6 by transmitting a signal to the server 6 or receiving a signal from the server 6 via the IP communication network 5. The terminal device 23 is a 10 / 100BASE-T cable 25.
2 and connect to 10 / 100BASE-T cable 252
It connects to the communication control apparatus 22 via.

The alarm terminal device 24 is another terminal device connected to the communication control device 22 in addition to the terminal device 23. The alarm terminal device 24 is installed in the subscriber's house and detects an abnormality such as a fire or intrusion of a suspicious person in the subscriber's house. Further, the alarm terminal device 24 transmits an image in the subscriber's house, switches the surveillance camera installed in the subscriber's house, and confirms a predetermined situation based on an instruction from the server 6. The alarm terminal device 24 transmits abnormality information such as an abnormality detection result, response information such as an image based on an instruction from the server 6 and a result of confirmation of the situation to the communication control device 22 to notify it. or,
The alarm terminal device 24 acquires the instruction from the server 6 via the communication control device 22. The alarm terminal device 24 is connected to the communication control device 22 via a cable 26. In addition to the terminal device 23, other terminal devices connected to the communication control device 22 include a care terminal device for confirming the survival and health of the subscriber, and an emergency call for making an emergency call regarding the survival of the subscriber. There are welfare terminal devices such as notification terminal devices. A terminal device that requires high reliability, such as the alarm terminal device 24 and the welfare terminal device, is connected to the communication control device 22.

10/100 BASE-T cable 251
Is a transmission line connecting the communication control device 22 and the ONU 21a, and is a 10 / 100BASE-T cable 252.
Is a transmission line connecting the terminal device 23 and the communication control device 22. 10/100 BASE-T is Ether
It is one of the standards related to the transmission medium used for net (Ethernet), and uses twisted pair (UTP) for a cable to perform baseband transfer, and through a device called a collecting device (hub) for connecting the cable, It is specified as a cable used when constructing a LAN by connecting each device in a star shape. 10 / 100BASE-T cable 25
1 and 252 use a two-core twisted pair wire to separate an upstream signal and a downstream signal for independent communication.
The upstream communication speed is 10/100 Mbps, and the downstream communication speed is 10/100 Mbps. Thus, the terminal device 23 and the communication control device 22, and the communication control device 22 and the ONU
21 / a as a transmission line connecting to 100a BAS
By using the E-T cables 251, 252, it is possible to independently transmit an upstream signal and a downstream signal, and the communication control device 22 can easily separate the upstream signal and the downstream signal. It is preferable because it can be controlled. The cable 26 is a transmission line that connects the alarm terminal device 24 and the communication control device 22. The cable 26 may be a transmission line that performs either serial transmission or parallel transmission, and a generally used external bus or the like can be used.

Next, the communication system 1b will be described. As shown in FIG. 2, the communication system 1b includes a subscriber home system 2b, a two-core metallic cable 3b, a splitter 7b, a line accommodation device 4b, an IP communication network 5,
It is composed of a telephone network 8b and a plurality of servers 6. or,
The subscriber premises system 2b includes a splitter 27b and xD.
SL modem 21b, communication control device 22, and terminal device 2
3, the alarm terminal device 24, and 10 / 100BASE-T
It is composed of the cables 251, 252, the cable 26, and the subscriber telephone terminal equipment 28b. In the communication system 1b, an xDSL network is used to connect the subscriber home system 2b to the IP communication network 5.

First, the configuration on the network side will be described. The two-core metallic cable 3b is a physical line for connecting the subscriber home system 2b to the IP communication network 5. The line accommodating device 4b is a line accommodating device installed in a switching center or the like and accommodating the two-core metallic cable 3b. For example, the line accommodation device 4b is a DSLAM (DSL A
ccess Multiplexer) etc. are used. Splitter 7b
Is a filter that superimposes and separates a low-frequency telephone signal and a high-frequency data signal. The splitter 7b separates the signal transmitted from the subscriber home system 2b, transmits the separated low frequency signal to the telephone network 8b, and transmits the high frequency signal to the line accommodation device 4b. Also, the splitter 7
b is a low-frequency signal from the telephone network 8b and the line accommodation device 4
The high frequency signal from b is superimposed and transmitted to the subscriber home system 2b. The IP communication network 5 and the server 6 are the same as those of the communication system 1a, and therefore, the same reference numerals are given and description thereof is omitted.

Next, the subscriber home system 2b will be described. The subscriber home system 2b is a system provided in the home of a subscriber who has subscribed to a communication service such as an xDSL network. The splitter 27b is provided on the side of the terminal device 23 used by the subscriber and is connected to the xDSL modem 21b, the subscriber telephone terminal device 28b, and the two-core metallic cable 3b. The splitter 27b separates the signal transmitted from the network side, transmits the separated low frequency signal to the subscriber telephone terminal device 28b, and transmits the high frequency signal to xDSL.
It is transmitted to the modem 21b. Further, the splitter 27b superimposes the low frequency signal from the subscriber telephone terminal device 28b and the high frequency signal from the xDSL modem 21b, and transmits them to the network side.

The xDSL modem 21b is a communication device which is provided on the side of the terminal device 23 used by the subscriber and which is connected to a network such as the IP communication network 5 and transmits / receives signals to / from the server 6 which is a partner device. One of xDSL21b is
Connect to a two-core metallic cable, splitter 27b,
It connects to the IP communication network 5 via the xDSL network. xDSL
The other of the modems 21b is connected to the 10 / 100BASE-T cable 251, and is connected to the communication control device 22 via the 10 / 100BASE-T cable 251. xDS
The L21b receives the signal transmitted from the server 6 via the two-core metallic cable 3b and the IP communication network 5, and transmits the signal transmitted from the communication control device 22 to the server 6. The xDSL modem 21b transmits about 25k of digital information.
The signal is converted into a signal having a frequency of about Hz to 1 MHz, and vice versa. Therefore, the xDSL modem 21b
Converts the received signal having a frequency of about 25 kHz to 1 MHz into digital information, transmits the digital information to the communication control device 22, and transmits the digital information transmitted from the communication control device 22 to a signal having a frequency of about 25 kHz to 1 MHz. And is transmitted to the splitter 27b. xDSL modem 21
As the b, for example, xTU-R (xDSL transceiver
Unit, Remote terminal end) etc. can be used. Further, in the present embodiment, the xDSL 21b uses a bridge type that connects one terminal device.

One of the communication control devices 22 is 10 /
Connected to 100BASE-T cable 251, 10/1
It is substantially the same as the communication system 1a except that it is connected to the xDSL modem 21b via the 00BASE-T cable 251.
Since the / 100BASE-T cables 251, 252 and the cable 26 are the same as those in the communication system 1a, the same reference numerals are given and description thereof will be omitted.

Next, the communication system 1c will be described. As shown in FIG. 3, the communication system 1c includes a subscriber premise system 2c, a coaxial cable 3c, and a head end 4.
c, the video server 9c, the receiving device 10c, and the CAT
V-modem 7c, gateway 8c, IP communication network 5
And a plurality of servers 6. In addition, the subscriber home system 2c includes a distributor 27c and a CATV modem 21.
c, communication control device 22, terminal device 23, alarm terminal device 24, and 10 / 100BASE-T cable 25
1, 252, cable 26, CATV tuner 28
c and a television 29c. Communication system 1
In c, the CATV network is used to connect to the IP communication network 5 from the subscriber home system 2c. CATV is a cable broadcasting service for television, and was developed for the purpose of enabling television viewing even in areas where it is difficult to receive radio waves for terrestrial television broadcasting, such as mountainous areas and areas with low population density.

First, the configuration on the network side will be described. The coaxial cable 3c is a physical line for connecting the subscriber home system 2c to the IP communication network 5. The head end 4c sends out a broadcast signal from the video server 9c and the receiving device 10c and a data signal from the CATV modem 7c to the coaxial cable 3c. The head end 4c also transmits a data signal to the IP communication network 5 transmitted from the coaxial cable 3c to the CATV modem 7c. The video server 9c is a server that performs independent broadcasting of CATV broadcasting stations, and the receiving device 10c receives broadcasting of other broadcasting stations.

The CATV modem 7c modulates a data signal into a signal in a predetermined frequency band and transmits it to the head end 4c. The CATV modem 7c is, for example, a QAM (Quad
rature Amplitude Modulation). Also, the CATV modem 7c demodulates the data signal from the head end 4c and transmits it to the gateway 8c. The head end 4c, the video server 9c, the receiving device 10c, and the CATV modem 7c are also connected by a coaxial cable. The gateway 8c connects the CATV network and the IP network 5. The IP communication network 5 and the server 6 are
Since it is the same as the communication system 1a, the same reference numerals are given and description thereof is omitted.

Next, the subscriber home system 2c will be described. The subscriber home system 2c is a system provided in the home of a subscriber who has subscribed to a communication service such as a CATV network. The distributor 27c is provided on the side of the terminal device 23 used by the subscriber and includes the CATV modem 21c and CAT.
The V tuner 28c and the coaxial cable 3c are connected. The distributor 27c distributes the signal transmitted from the network side. The distributor 27c transmits the data signal from the server 6 to the CATV modem 21c and the broadcast signal from the receiving device 10c or the video server 9c to the CATV tuner 2.
8c. The distributor 27c also transmits the signal transmitted from the CATV modem 21c to the coaxial cable 3c. The broadcast signal transmitted to the CATV tuner 28c is output to the television 29c, a monitor or the like.

The CATV modem 21c is a communication device which is provided on the side of the terminal device 23 used by the subscriber and which is connected to a network such as the IP communication network 5 and transmits / receives a signal to / from the server 6 which is a partner device. One of the CATV modems 21c is connected to the coaxial cable, and the distributor 27c, CATV
It connects to the IP communication network 5 via the network. CATV modem 2
The other side of 1c is the 10 / 100BASE-T cable 25
1/100 / 100BASE-T cable 251
It connects to the communication control apparatus 22 via. The CATV modem 21c uses the coaxial cable 3c and the IP communication network 5 to
The communication control device 2 receives the signal transmitted from the server 6.
The signal transmitted from 2 is transmitted to the server 6. CATV
The modem 21c modulates a data signal into a signal in a predetermined frequency band and demodulates the modulated signal. Therefore, the CATV modem 21c demodulates the received modulated signal and transmits it to the communication control device 22, modulates the signal transmitted from the communication control device 22 and transmits it to the distributor 27c. The CATV modem 21c is, for example, a QAM (Quadra
ture Amplitude Modulation) Performs modulation, etc. Further, in the present embodiment, the CATV modem 21c uses a bridge type that connects one terminal device.

One of the communication control devices 22 is 10 /
Connected to 100BASE-T cable 251, 10/1
Substantially the same as the communication system 1a except that it is connected to the CATV modem 21c via the 00BASE-T cable 251.
Since the / 100BASE-T cables 251, 252 and the cable 26 are the same as those in the communication system 1a, the same reference numerals are given and description thereof will be omitted.

[Communication Protocol of Communication System] Next, the communication protocol of the communication systems 1a to 1c will be described. FIG. 4 is an explanatory diagram showing a configuration of a communication protocol of the communication system 1a according to the embodiment of the present invention, and FIG. 5 shows a configuration of a communication protocol of another communication system 1b according to the embodiment of the present invention. FIG. 6 is an explanatory diagram showing the configuration of the communication protocol of still another communication system 1c according to the embodiment of the present invention.

As shown in FIGS. 4 to 6, the terminal device 23,
The communication protocols of the communication control device 22 are as follows: from lower to higher, 10 / 100BASE-T, Ethernet
(Ethernet), PPPoE, PPP, IP, TCP
It is composed of layers. Ethernet is a protocol standardized by IEEE802.3. PPPoE is a function of PPP
It is a protocol for use through Internet (Ethernet), and IETF (Internet Engineering Task F
RFC (Request For Comments) 251
It is standardized as 6. PPP is a protocol for point-to-point mutual communication. IP is a protocol that provides a connectionless datagram service. TCP is a protocol that provides highly reliable communication between ports by connection-oriented communication.

The communication protocol of the ONU 21a is as follows:
It is composed of layers such as ASE-T and Ethernet (Ethernet), and the network side is optical fiber, ATM layer, AAL5, bridge, Ethernet.
It is composed of a layer called t (Ethernet). xDS
The communication protocol of the L modem 21b is the communication control device 22.
The side is the same as the ONU 21a, and the network side is
From bottom to top, 2-core metallic cable, ATM
Layer, AAL5, bridge, Ethernet (Ethernet). The communication protocol of the CATV modem 21c is O on the communication control device 22 side.
Similar to the NU 21a, the network side is composed of layers such as a coaxial cable, an ATM layer, an AAL5, a bridge, and an Ethernet (Ethernet) in order from the lower order to the higher order.

In FIGS. 4 to 6, AAL5 and Ether
The rnet (Ethernet) is shown as straddling the bridge to indicate that the Et from the communication control device 22 is
The bridge encapsulates the Ethernet (Ethernet) frame with the AAL5 protocol, passes it to AAL5, and transmits the data to the network side. The bridge decapsulates the data encapsulated with the AAL5 protocol from the network side. Ethernet
It means that the data is transmitted to the communication control device 22 side by passing it to (Ethernet). The ATM layer adds the 5-byte header information to the 48-byte user data passed from the upper AAL5 to create an ATM cell, passes it to the physical layer, and the ATM received from the physical layer.
Disassemble the cell and pass it to AAL5. The AAL5 performs division and assembly of ATM cells.

The communication protocol of the line accommodation device 4a is such that the ONU 21a side is an optical fiber,
It is composed of a layer called ATM layer, and the server 6 side is A
It is composed of a TM physical layer and an ATM layer. The communication protocol of the line accommodation device 4b is the same as that of the line accommodation device 4a on the server 6 side.
It is composed of a layer called TM layer. The communication protocol of the head end 4c is the same as that of the line accommodation device 4a on the server 6 side, and the CATV modem 21c side is composed of layers of a coaxial cable and an ATM layer in order from the lower order to the higher order. The ATM physical layer converts information into information on a physical medium for transmitting the information, transmits the information, and passes the information to the ATM layer as an ATM cell.

The communication protocols of the server 6 are ATM physical layer, ATM layer, AAL5, bridge, Ethernet (Ethernet), PPPoE,
It is composed of layers such as PPP, IP, and TCP. Here again, the AAL5 and the Ethernet (Ethernet) are illustrated as straddling the bridge. The reason is that the bridge encapsulates the Ethernet (Ethernet) frame transmitted by the server 6 with the AAL5 and AAL5.
Data is sent to the network side, and the bridge decapsulates the data encapsulated by AAL5 from the network side to the Ethernet side.
It means that the server 6 receives the data by passing it to (Ethernet).

At the physical layer level, the terminal device 23
And communication control device 22, communication control device 22 and ONU 21
a, xDSL modem 21b, CATV modem 21c are connected by 10 / 100BASE-T, and ONU2
1a and the line accommodation device 4a are connected by an optical fiber and an ATM layer, and the xDSL modem 21b and the line accommodation device 4 are connected.
b is connected by a two-core metallic cable and an ATM layer, and the CATV modem 21c and the head end 4c are connected by a coaxial cable and an ATM layer.
The a, 4b, the head end 4c and the server 6 are connected by the ATM physical layer and the ATM layer.

At the lower layer level of the data link layer, the terminal device 23 and the communication control device 22 and the communication control device 22 are turned on.
The U21a, xDSL21b, and CATV modem 21c are connected by Ethernet (Ethernet),
The ONU 21a, xDSL 21b, CATV modem and server 6 are connected by a bridge and AAL5. At the upper layer level of the data link layer, the terminal device 23 and the communication control device 22, and the communication control device 22 and the server 6 are connected by PPP and PPPoE, and the data link between the terminal device 23 and the communication control device 22. , Establishes a data link between the communication control device 22 and the server 6. Then, the terminal device 23 and the communication control device 22, and the communication control device 22 and the server 6 perform communication at the IP layer level and the TCP layer level, respectively.

[Configuration of Communication Control Device] Next, the communication control device 22 will be described in more detail. FIG. 7 is a block diagram showing the configuration of the communication control device 22 according to the embodiment of the present invention. As shown in FIG. 7, the communication control device 22 is
First communication interface unit 221, second communication interface unit 222, and alarm terminal interface unit 22
3, a reception control unit 224a, a transmission control unit 224b,
Downstream signal information processing unit 225a and upstream signal information processing unit 2
25b, a main control unit 226, an abnormality detection unit 227, a switching control unit 228, relays 229a and 229b,
It is composed of lines 230a and 230b.

The first communication interface section 221 has O
NU21a, xDSL modem 21b, CATV modem 2
1c or other communication device. The first communication interface unit 221 acquires a reception signal received by the ONU 21a, the xDSL modem 21b, and the CATV modem 21c from the server 6 via the 10 / 100BASE-T cable 251, and transmits the reception signal to the reception control unit 224a. Further, the first communication interface unit 221 acquires from the transmission control unit 224b the transmission signal transmitted from the terminal device 23 and the partner device signal generated by the communication control device 22 and addressed to the server 6, and obtains 10 / 100BASE-T cable 251, ONU 21a, xDSL modem 21b, CAT
It is transmitted to the V modem 21c.

The second communication interface section 222 is connected to the terminal device 23. Second communication interface unit 2
Reference numeral 22 denotes the transmission signal transmitted from the terminal device 23.
/ 100BASE-T cable 252,
It is transmitted to the transmission control unit 224b. In addition, the second communication interface unit 222 is connected to the ONU 21a, xD from the server 6.
The received signals received by the SL modem 21b and the CATV modem 21c are acquired from the reception control unit 224a, and
The terminal device 23 via the 0BASE-T cable 252
Send to.

The alarm terminal interface unit 223 is a third communication interface unit that connects to other terminal devices other than the terminal device 23. Alarm terminal interface unit 223
From the server 6 to the ONU 21a and the xDSL modem 21
b, information required by the alarm terminal device 24 included in the reception signal received by the CATV modem 21c, for example, transmission of an image of the subscriber's home from the server 6, switching of surveillance cameras installed in the subscriber's home, An instruction such as confirmation of a predetermined situation is acquired from the main control unit 226 and transmitted to the alarm terminal device 24 via the cable 26. Further, the alarm terminal interface unit 223 acquires information such as an abnormality detection result, an image, and a status confirmation result from the alarm terminal device 24 via the cable 26, and transmits the information to the main control unit 226.

The reception controller 224a and the transmission controller 224
b, the downlink signal information processing unit 225a, the uplink signal information processing unit 225b, and the main control unit 226 function as a communication control unit that controls communication between the terminal device 23 and a partner device such as the server 6. The reception control unit 224a receives O from the server 6.
NU21a, xDSL modem 21b, CATV modem 2
The reception signal received by 1c is acquired from the first communication interface unit 221 and transmitted to the downlink signal information processing unit 225a. Further, the reception control unit 224a acquires an instruction for transmitting the reception signal to the terminal device 23 from the main control unit 226 via the downlink signal information processing unit 225a, and according to the instruction, transmits the reception signal to the second communication interface. It is transmitted to the unit 222 and is transmitted to the terminal device 23 via the second communication interface unit 222.

The transmission control unit 224b sends the transmission signal transmitted from the terminal device 23 to the second communication interface unit 2
22 and transmits to the upstream signal information processing unit 225b. In addition, the transmission control unit 224b uses the upstream signal information processing unit 2
Server 6 generated by the communication control device 22 itself from 25b
A signal addressed to the other device addressed to is acquired. Also, the transmission control unit 2
24b acquires a transmission signal from the terminal device 23 and an instruction for transmitting a signal addressed to the partner device to the server 6 from the main control unit 226 via the upstream signal information processing unit 225b. Then, the transmission control unit 224b transmits a transmission signal or a signal addressed to the partner device to the first communication interface unit 221 according to the instruction, and transmits the signal to the server 6 via the first communication interface unit 221.

The downlink signal information processing unit 225a is connected to the server 6
The reception signals received by the ONU 21a, the xDSL modem 21b, and the CATV modem 21c from the reception control unit 224a.
The information such as the Ethernet (Ethernet) frame included in the received signal is extracted and transmitted to the main control unit 226. In addition, the downlink signal information processing unit 225a
Acquires an instruction for transmitting a reception signal to the terminal device 23 from the main control unit 226, and transmits the instruction to the reception control unit 224a.

The upstream signal information processing unit 225b acquires the transmission signal transmitted from the terminal device 23 from the transmission control unit 224b, extracts information such as Ethernet (Ethernet) frame contained in the transmission signal, and the main control unit. Two
26. In addition, the upstream signal information processing unit 225b
From the main control unit 226, the communication control device 22 itself obtains information on the destination device addressed to the server 6 and generates a signal on the destination device including the information on the destination device, and transmits the signal to the transmission control unit 224b. In addition, the upstream signal information processing unit 225b
The main control unit 226 acquires a transmission signal from the terminal device 23 and an instruction to transmit a signal addressed to the partner device to the server 6, and transmits the transmission signal to the transmission control unit 224b.

Next, the main controller 226 will be described.
Since the processing performed by the main control unit 226 is diverse, it will be described separately for some items.

(Establishment of data link) Main controller 226
Controls the establishment of a data link between the terminal device 23 and the communication control device 22, and the establishment of a data link between the communication control device 22 and the server 6. The main controller 226 uses the PPP
It has a communication control function that establishes a data link using oE and PPP to perform communication.

(Processing for Received Signal) Main Control Unit 226
From the server 6 to the ONU 21a and the xDSL modem 21
b, the transmission of the reception signal received by the CATV modem 21c to the terminal device 23 is controlled. Specifically, the main controller 22
6 acquires information such as an Ethernet (Ethernet) frame included in the received signal from the downlink signal information processing unit 225a. FIG. 8 is an explanatory diagram illustrating an Ethernet (Ethernet) frame 100. As shown in FIG. 8, the Ethernet (Ethernet) frame 100 includes an Ethernet header 101 and an Ethernet header 101.
It is composed of an rnet payload 102 and a checksum 103. In FIG. 8, an Ethernet frame 100, an Ethernet payload 102, a PPP
The number attached next to the oE payload 105a represents the length of each field.

When the main controller 226 controls the transmission of the reception signal at the Ethernet (Ethernet) level, that is, the MAC sublayer level, the information of the Ethernet header 101 is used as the control information included in the reception signal. use. Ethernet header 101 is Ether
A destination MAC address that represents a destination that transmits the rnet frame 100, a source MAC address that represents a source that transmits the Ethernet frame 100, and ETH
It is composed of ERTYPE. The MAC sublayer is LA
It corresponds to the lower sublayer of the data link layer that defines the transmission control technology used by N and the like. In the MAC sublayer, Ether
It defines the format of the net frame, the transmission / reception method, the error detection method, and the like. There are several types of access control methods used in the MAC sublayer, but in Ethernet,
The CSMA / CD method is used. The MAC address is an address unique to each device, and is an address that identifies each device when performing communication at the MAC sublayer level. MA
The C address is generally represented by a combination of a number unique to each manufacturer managed and assigned by IEEE and a number uniquely assigned to each device by each manufacturer.

The main control section 226, in particular,
Control is performed using the destination MAC address and the source MAC address included in the t header 101. Main control unit 2
If the transmission destination MAC address of the Ethernet frame of the received signal represents the terminal device 23, 26 determines to send the received signal to the terminal device 23, and the downlink signal information processing unit 225a sends the received signal to the terminal. Instruct the device 23 to transmit. At this time, the transmission source MAC address of the Ethernet header 101 included in the received signal is ONU 21a, xDSL 21b, CATV modem 21.
c and the destination MAC address represent the terminal device 23. The main control unit 226 does not change the transmission source MAC address and the transmission destination MAC address as they are, and receives the reception signal via the second communication interface unit 222.
3, the transmission source MAC address may be replaced with the MAC address of the communication control device 22, the downlink signal information processing unit 225a may be transmitted, and the reception signal may be transmitted to the terminal device 23.

On the other hand, the main control section 226 controls the Et of the received signal.
If the destination MAC address of the hernet frame represents the communication control device 22 and the received signal is addressed to the communication control device 22, it is determined that the received signal is processed by the communication control device 22, and the downlink signal is received. Information processing unit 225
No instruction is sent to a regarding the transmission of the received signal.

When the main control unit 226 controls the transmission of the reception signal at the PPPoE level, the Ethernet frame 100 acquired from the downlink signal information processing unit 225a.
From the Ethernet payload 102,
Ethernet is used as control information included in the received signal.
The information of the PPPoE header 104 included in the payload 102 is used. As shown in FIG. 8, Ethernet
The payload 102 has a PPPoE header 104 and a PP
It is composed of a PoE payload 105. PPPoE
The header 104 includes a version, type, code, session ID, and payload length. PPPoE payload 105a in case of PPP session stage
Consists in particular of a PPP protocol identifier and a PPP payload. The main control unit 226 mainly uses the PPPoE.
Control is performed using the session ID included in the header 104. The session ID is a unique ID given to each device when the discovery stage is completed.

Further, when the main control unit 226 controls the transmission of the received signal at the IP layer level, the Ethernet frame 100 acquired from the downlink signal information processing unit 225a.
Then, the encapsulation is released and the IP packet is extracted. FIG. 9 is an explanatory diagram illustrating packet formats of the IP packets 200 and 210. FIG. 9A shows IPv4.
9 shows a packet format of an IP packet 200 of (Internet Protocol Version 4), and FIG.
(B) is IPv6 (Internet Protocol Version
6 shows a packet format of the IP packet 210 of 6). The IP packets 200 and 210 are composed of IP headers 201 and 211 and data 202 and 212.

When the main control unit 226 controls the transmission of the received signal at the IP layer level, the I information included in the IP packets 200 and 210 is used as the control information included in the received signal.
The information in the P headers 201 and 211 is used. In the case of IPv4, as shown in FIG. 9A, the IP header 201 is
Version, header length, service type, packet length,
It consists of an identification number, a flag, a fragment offset, a TTL (Time To Live), a protocol number, a header checksum, a source IP address, a destination IP address, and an option.

The version indicates that the version of the IP packet 200 is 4. The header length indicates the length of the IP header 201. The service type indicates the characteristics of the service requested by the IP packet 200. The service type is PRE that represents the priority of the IP packet 200.
CEDENCE, D indicating that the delay is not delayed as much as possible, T indicating that high throughput is required, R indicating that high reliability is required, and requesting that the cost is minimized. It is divided into an unused subfield M, which indicates that P that represents the priority
RECEDENCE indicates that the larger the value, the higher the importance, and represents the priority level from 0 to 7. The packet length represents the length of the IP packet 200.

The identification number (Identification) represents an ID for identifying the IP packet. The flag indicates whether or not the fragment can be used. The fragment offset represents the position in the original data. TTL is an IP packet 200
Represents the maximum period that can live on the Internet. T
TL is set by the sender and is set to 1 every time it passes through the gateway.
Drawn one by one. When the TTL becomes 0, the IP packet 200 is discarded. The protocol number is data 202
Data to which higher level protocol should be passed, and data 20
2 format is specified. The header checksum is
It represents the checksum of the header 201. The source IP address represents the IP address of the source that transmits the IP packet 200, and the destination IP address is the IP packet 20.
It represents the IP address of the destination to which 0 is transmitted. The option specifies an option to add special processing to the transmission of the IP packet 200.

On the other hand, in the case of IPv6, as shown in FIG. 9B, the IP header 211 includes a version, traffic class, flow label, payload length, extension header type, maximum hop count, source IP address, transmission Destination IP
It consists of an address and an optional extension header.
The version indicates that the version of the IP packet 210 is 6. The traffic class is used to perform priority control, and represents the priority of the IP packet 210 and the like. The flow label is an identifier for a data flow used to realize traffic control at the IP layer. Flow labels can be used for videos and VoIP (Voice Over I).
It is used for transmitting an IP packet 210 having a severe allowable delay time such as P). The payload length is IP packet 210
Represents the length of. The type of extension header is the IP header 211
Represents the area following.

The maximum number of hops represents the maximum period during which the IP packet 210 can live on the Internet. The maximum number of hops is the same as TTL. The source IP address represents the IP address of the source that transmits the IP packet 210, and the destination IP address is the IP packet 210.
Represents the IP address of the transmission destination. The optional extension header represents a specified optional header.

In the case of IPv4, the main controller 226 mainly
It is preferable to control using the TTL, the source IP address, the destination IP address, and the service type included in the IP header 201. In the case of IPv6, it is preferable that the main control unit 226 mainly controls using the maximum number of hops, the source IP address, the destination IP address, the flow label, and the traffic class included in the IP header 211.

When the TTL or the maximum number of hops of the IP packet 200, 210 of the received signal is 0, the main control section 226 discards the IP packet 200, 210 and the downlink signal information processing section 225a receives the IP packet 200, 210. No instructions will be given regarding signal transmission. Further, when the destination IP address of the IP packet 200 or 210 of the received signal represents the terminal device 23, the main control unit 226 determines to send the received signal to the terminal device 23, and the downlink signal information processing unit. 22
5a is instructed to transmit the received signal to the terminal device 23. In the case of IPv6, the main control unit 226 looks at the flow label and if the next transfer destination of the IP packet 210 is the terminal device 23, the downlink signal information processing unit 225a.
May be instructed to transmit the received signal to the terminal device 23.

Further, the main control section 226 determines the IP of the received signal.
Service type of packet 200 and IP packet 21
Looking at traffic class 0, IP packet 200,
The downlink signal information processing unit 225a is instructed to determine the priority order of transmitting 210 to the terminal device 23, and to transmit the reception signal including the IP packets 200 and 210 having high priority order to the terminal device 23 first. For example, the main controller 226
Gives an instruction to preferentially transmit the IP packet 200 having a large value of PRECEDENCE indicating the priority order, or preferentially transmit the IP packet 200 requesting not to be delayed as much as possible. As the reception signal to be preferentially transmitted to the terminal device 23, for example, VoIP
For example, the received signal includes information such as voice information and moving image information, which includes information whose quality is significantly deteriorated due to delayed arrival such as voice interruption and video interruption. When there is no difference between the service type of the IP packet 200 of the received signal and the priority order indicated by the traffic class of the IP packet 210, the main control unit 226, in the order in which the reception control unit 224a acquires the received signal, That is, the received signal is the server 6
From the downlink signal information processing unit 22 so that the received signals are transmitted to the terminal device 23 in the order of arrival from the communication control device 22 to the terminal device 23.
Instruct 5a.

On the other hand, the main control section 226 determines the IP of the received signal.
When the destination IP addresses of the packets 200 and 210 represent the communication control device 22 and the received signal is addressed to the communication control device 22, it is determined that the received signal is processed by the communication control device 22, Downlink signal information processing unit 225
No instruction is sent to a regarding the transmission of the received signal. In the case of IPv6, the main control unit 226 may judge that the received signal is processed by the communication control device 22 when there is no next transfer destination by looking at the flow label.

Further, when the main control unit 226 controls the transmission of the received signal at the TCP layer level, the Ethernet frame 10 acquired from the downlink signal information processing unit 225a.
From 0, the encapsulation is released and the TCP packet is extracted. FIG. 10 is an explanatory diagram illustrating the packet format of the TCP packet 300. TCP packet 300
Is composed of a TCP header 301 and data 302.

When controlling the transmission of the received signal at the TCP layer level, the main control section 226 uses the TCP included in the TCP packet 300 as the control information included in the received signal.
The information in the header 301 is used. As shown in FIG.
The TCP header 301 includes a source port number, a destination port number, a sequence number, an ACK number, a data offset, a reservation, a flag, a window size, a header checksum, an urgent pointer, and an option.

The source port number is TCP packet 30.
Indicates the port number of the sender that sends 0. The destination port number indicates the port number of the destination to which the TCP packet 300 is transmitted. The sequence number indicates the transmission start position in the transmission data buffer. The ACK number indicates the sequence number up to the point where it could be received. The data offset indicates the start position of the data 302 of the TCP packet 300. The reservation is a reserve area. The flag is used for validating the other fields of the TCP header 301 and for controlling the connection, and is 1 when the flag is valid,
Set to 0 to invalidate. U that indicates that the flag contains urgent data and requests priority transmission
A indicating that the RG and ACK number fields are valid
CK, PSH used to promptly pass the TCP packet 300 to the application layer, RST requesting forced disconnection of the connection, SYN requesting synchronization of sequence numbers, and FIN requesting end of transmission.

The window size represents the number of bytes that can be continuously transmitted without confirming the response from the other party. The header checksum is used for detecting an error in the TCP header 301.
The urgent pointer indicates the position where the urgent data ends in the window, that is, how far the urgent data is. The option specifies an optional function of TCP.

The main control section 226 mainly uses the TCP header 30.
It is preferable to control using the source port number, the destination port number, and the flag included in 1. Main control unit 22
When the destination port number of the TCP packet 300 of the received signal indicates the port number of the terminal device 23, 6 determines to send the received signal to the terminal device 23, and the downlink signal information processing unit 225a notifies the The received signal is sent to the terminal device 23.
Instruct to send to.

Further, the main controller 226 controls the TC of the received signal.
By looking at the flag of the P packet 300, it is determined whether the URG is 1 and the TCP packet 300 indicates that it contains urgent data. Main controller 226
When it is determined that the TCP packet 300 includes the urgent data, the instruct the downlink signal information processing unit 225a to transmit the reception signal including the TCP packet 300 to the terminal device 23 first. . The main controller 22
6 does not include the TCP packet 3 urgent data of the reception signal, in the order in which the reception control unit 224a acquires the reception signal, that is, the reception signal is transmitted from the server 6 to the communication control device 2
The downlink signal information processing unit 225a is instructed to transmit the received signal to the terminal device 23 in the order in which the signal arrives at 2.

On the other hand, the main controller 226 controls the TC of the received signal.
When the destination port number of the P packet 300 indicates the port number of the communication control device 22, it is determined that the communication control device 22 processes the received signal, and the downlink signal information processing unit 225a receives the received signal of the received signal. Do not give instructions regarding transmission.

The main control unit 226 controls the ONU 2 from the server 6.
1a, xDSL modem 21b, CATV modem 21c received signal is addressed to the communication control device 22, when it is determined that the received signal is processed by the communication control device 22, first, the IP packet 200, It is determined whether or not the data 202 and 212 of 210 and the data 302 of the TCP packet 300 include information required by the alarm terminal device 24. When determining that the information required by the alarm terminal device 24 is included, the main control unit 226 performs the following processing. From the data 202, 212, 302, the main control unit 226 transmits information regarding the instruction from the server 6 such as transmission of images inside the subscriber's house, switching of surveillance cameras installed in the subscriber's house, and confirmation of a predetermined situation. Take it out. The main control unit 226 transmits the extracted information to the alarm terminal interface unit 223, and transmits it to the alarm terminal device 24 to notify it. The main controller 226 controls the alarm terminal device 24 accordingly.

On the other hand, the main control section 226 controls the alarm terminal device 2
When it is determined that the information required by the communication control device 4 is not included in the data 202, 212, and 302, the communication control device 2
It is determined whether or not information such as an instruction for 2, for example, an instruction of a response to the reception of the signal from the server 6 is included. When the main control unit 226 determines that the information such as the instruction to the communication control device 22 is included, the main control unit 226 assembles the destination device address information including the response content to the server 6 according to the instruction. The main control unit 226 controls the communication control device 22 itself by performing processing such as transmitting the assembled destination device information to the upstream signal information processing unit 225b. When the main control unit 226 determines that the information such as the instruction to the communication control device 22 is not included, the main control unit 226 does not particularly process the received signal.

(Assembling information for destination device) Main controller 2
26 assembles the destination device address information to the destination device such as the server 6. The main control unit 226 assembles the Ethernet frame 100 as the destination information. The main control unit 226 uses the alarm terminal interface unit 22.
When the abnormal information such as the abnormal detection result, the image based on the instruction from the server 6, the response information such as the result of the confirmation of the situation is acquired from the alarm terminal device 24 via 3, or the received signal from the server 6 is received. When making a response,
The t-frame 100 is assembled.

First, the main control section 226 determines the information acquired from the alarm terminal device 24 and the content of the response to the server 6.
It is stored in the data 301 of the TCP packet 300. Next, the main controller 226 adds the TCP header 3 to the data 300.
01 is added to assemble the TCP packet 300.
At this time, when the information stored in the data 301 is the information acquired from the alarm terminal device 24, or the information that needs to be transmitted with priority to the server 6, the main control unit 22
6 sets the URG of the flag of the TCP header 301 to 1,
It is indicated that the emergency data is included, and the position where the emergency data ends in the window is stored in the emergency pointer.
Further, the main control unit 226 stores the port number of the communication control device 22 in the transmission source port number, and stores the port number of the server 6 in the transmission destination port number.

Next, the main controller 226 sends the IP header 20
1 and 211 are added to the TCP packet 300, and IP
Assemble the packets 200 and 210. At this time, the main control unit 226 sets the transmission destination IP address to the I of the server 6.
Store the P address. The main control unit 226 is a source IP
The IP address of the communication control device 22 or the IP address of the terminal device 23 is stored in the address. Further, the main control unit 226 controls the data 2 of the IP packets 200 and 210.
The priority order and the requested service are determined according to the information stored in 01 and 211, that is, the information stored in the data 301, and are stored in the service type in the case of IPv4 and in the traffic class in the case of IPv6. The main controller 226
When the information stored in the data 201 and 211 is information acquired from the alarm terminal device 24, etc., it is necessary to prioritize transmission to the server 6, and therefore a high priority is stored in the service type and traffic class. .

Finally, the main control section 226 determines that the
The et header 101 is added to the IP packets 200 and 210 to assemble the Ethernet frame 100. At this time, the main control unit 226 stores the MAC address of the server 6 in the destination MAC address. The main control unit 226 stores the MAC address of the communication control device 22 or the MAC address of the terminal device 23 in the transmission source MAC address. The main control unit 226 sends the assembled Ethernet frame 100, which is the information addressed to the partner device,
It is transmitted to the upstream signal information processing unit 225b.

(Processing Related to Transmission Signal and Signal to Destination Device) The main controller 226 controls the transmission of the transmission signal transmitted from the terminal device 23 to the destination device such as the server 6.
Further, the main control unit 226 controls the transmission of the signal to the partner device including the information to the partner device assembled by the main control unit 226 to the partner device such as the server 6. Specifically, the main controller 226
Acquires information such as the Ethernet (Ethernet) frame 100 included in the transmission signal from the upstream signal information processing unit 225b. Regarding the signal addressed to the partner device, the main control unit 226 is the information addressed to the partner device assembled by itself.
The Ethernet frame 100 is used as it is.

The main control unit 226 is included in the transmission signal and the destination device signal when controlling the transmission of the transmission signal and the destination device signal at the Ethernet (Ethernet) level, that is, the MAC sublayer level. As control information, Et
The information of the hernet header 101 is used. The main control unit 226 particularly controls using the transmission destination MAC address and the transmission source MAC address included in the Ethernet header 101. The main control unit 226 informs the upstream signal information processing unit 225b of the Eth of the transmission signal and the signal addressed to the partner device.
The server 6 indicated by the destination MAC address of the ernet frame 100 is instructed to transmit the transmission signal and the signal addressed to the partner device. At this time, Eth included in the transmission signal
The source MAC address of the Internet header 101 represents the terminal device 23, and the destination MAC address thereof represents the server 6. The main control unit 226 uses the transmission source MAC address,
The transmission signal is transmitted via the first communication interface unit 221 to the server 6 without changing the destination MAC address as it is.
The transmission source MAC address may be replaced with the MAC address of the communication control device 22, and the transmission signal may be transmitted to the upstream signal information processing unit 225b and the transmission signal may be transmitted to the server 6.

When the main control unit 226 controls the transmission of the transmission signal and the signal addressed to the partner device at the PPPoE level, the main control unit 226 acquires the Ethernet obtained from the upstream signal information processing unit 225b.
t-frame 100 or Ethere assembled by yourself
From t frame 100, Ethernet payload 1
02 is extracted, and the information of the PPPoE header 104 included in the Ethernet payload 102 is used as the control information included in the transmission signal and the signal addressed to the partner device. The main control unit 226 mainly controls using the session ID included in the PPPoE header 104.

Further, the main control unit 226, when controlling the transmission of the transmission signal and the signal addressed to the partner device at the IP layer level, receives the Ethernet obtained from the upstream signal information processing unit 225b.
t-frame 100, Ethernet assembled by itself
The IP packet is extracted from the frame 100 by decapsulating. When controlling the transmission of the transmission signal and the signal addressed to the partner device at the IP layer level, the main control unit 226 uses the IP included in the IP packets 200 and 210 as the control information included in the transmission signal and the signal addressed to the partner device. Header 201,2
Use 11 information.

In the case of IPv4, the main controller 226 mainly
It is preferable to control using the TTL, the source IP address, the destination IP address, and the service type included in the IP header 201. In the case of IPv6, it is preferable that the main control unit 226 mainly controls using the maximum number of hops, the source IP address, the destination IP address, the flow label, and the traffic class included in the IP header 211.

When the TTL or maximum number of hops of the IP packets 200 and 210 of the transmission signal and the signal addressed to the partner device is 0, the main control unit 226 discards the IP packets 200 and 210, and the upstream signal information processing unit 225b. However, it does not give an instruction regarding the transmission of the transmission signal or the signal addressed to the partner device.
In addition, the main control unit 226, the upstream signal information processing unit 225b
The IP packet 200 of the transmission signal and the signal addressed to the partner device,
The server 6 indicated by the destination IP address of 210 is instructed to transmit the transmission signal and the signal addressed to the partner device.
In the case of IPv6, the main control unit 226 transmits the transmission signal and the signal addressed to the partner device to the server 6 that is the transfer destination of the IP packets 200 and 210 indicated by the flow label so as to transmit the upstream signal information processing unit. You may instruct 225b.

Further, the main control section 226 determines the service type of the IP packet 200 of the transmission signal and the signal addressed to the partner device,
Looking at the traffic class of the IP packet 210,
The upstream signal information processing unit determines the priority of transmitting the packets 200 and 210 to the server 6, and transmits the transmission signal including the IP packets 200 and 210 having a high priority and the signal addressed to the partner device to the server 6 first. Instruct 225b. For example, the main control unit 226 uses the PRE indicating the priority order.
It is instructed to preferentially transmit the IP packet 200 having a large CEDENCE value, or preferentially transmit the IP packet 200 requesting not to be delayed as much as possible.

For example, in a normal state where the alarm terminal device 24 does not detect an abnormality, and the communication control device 22 has only a transmission signal from the terminal device 23, the main control unit 22
6 is configured to transmit a transmission signal including information such as voice information such as VoIP and video information, in which quality deterioration is remarkable due to delay in arrival such as voice interruption, video interruption, and the like. Then, the upstream signal information processing unit 225b is instructed. If there is no difference in the priority of the service type of the IP packet 200 of the transmission signal and the traffic class of the IP packet 210, the transmission controller 224.
The upstream signal information processing unit 225b is instructed to transmit the transmission signals in the order in which b acquires the transmission signals, that is, in the order in which the transmission signals arrive from the terminal device 23 to the communication control device 22.

When the alarm terminal device 24 detects an abnormality, even when the transmission signal from the terminal device 23 arrives at the communication control device 22 first, the abnormality detection result or , The upstream signal information processing unit 225b is instructed to first transmit the signal addressed to the partner device, which includes information such as the image and the confirmation result of the situation. However, if the transmission signal is VoIP
Voice information such as, and when information such as video information whose quality deterioration is remarkable due to delay in arrival is included in the quality of the transmission signal and the urgency of the information included in the signal addressed to the partner device, The priority order of the transmission signal and the signal addressed to the partner device is determined, and the upstream signal information processing unit 225b is instructed.

Further, the main control section 226 controls the transmission of the transmission signal and the signal addressed to the partner device at the TCP layer level.
Ethernet acquired from the upstream signal information processing unit 225b
From the et frame 100 and the Ethernet frame 100 assembled by the communication control device 22 itself, the TCP packet 300 is extracted by decapsulating. Main control unit 22
6 controls the information of the TCP header 301 included in the TCP packet 300 as the control information included in the transmission signal and the signal addressed to the partner device when controlling the transmission of the transmission signal and the signal addressed to the partner device at the TCP layer level. use.

The main controller 226 mainly uses the TCP header 30.
It is preferable to control using the source port number, the destination port number, and the flag included in 1. Main control unit 22
6 instructs the upstream signal information processing unit 225b to transmit the transmission signal to the server 6 indicated by the transmission signal and the destination port number of the TCP packet 300 of the signal addressed to the partner device.

Further, the main control section 226 looks at the flags of the TCP packet 300 of the transmission signal and the signal addressed to the partner device,
When it is determined that the CP packet 300 includes the emergency data, the uplink signal information processing unit 225b is instructed to transmit the transmission signal including the TCP packet 300 and the signal addressed to the partner device to the server 6 first. do. Note that the main control unit 226 transmits the transmission signals in the order in which the transmission signals arrive from the terminal device 23 to the communication control device 22 when there is no difference in the priority order of the transmission signal and the signal addressed to the partner device. It instructs the upstream signal information processing unit 225b.

Incidentally, the main control section 226 determines that the Ethernet
Which of the control information (MAC sublayer), IP layer, and TCP layer is used to control the transmission of the reception signal, the transmission signal, and the signal addressed to the partner device can be appropriately set. For example,
From the beginning, the main control unit 226 may be provided with only the control function based on the control information of the IP layer or the control function based on the control information of the TCP layer. or,
The main controller 226 may have both a control function based on the control information of the IP layer and a control function based on the control information of the TCP layer. In this case, control using only IP layer control information, control using only TCP layer control information,
Either the control using both the IP layer control information and the TCP layer control information may be set, and the setting may be changed as necessary. Alternatively, the main controller 2
The control unit 26 may determine which control is to be performed depending on the situation and switch the control. Since the TCP layer is an upper layer than the IP layer, if the control is performed using the control information of the TCP layer, the higher and finer control becomes possible. I
If control is performed using both the control information of the P layer and the control information of the TCP layer, finer control becomes possible.

Further, when the main control section 226 assembles the information addressed to the partner device, the source IP address is set to the terminal device 23.
It is also possible to appropriately set whether the IP address is the IP address of the communication control device 22 or the IP address of the communication control device 22.
The main control unit 226 may have a function of using one of the IP address of the terminal device 23 and the IP address of the communication control device 22. In addition, the main controller 226
It may have a function of using both IP addresses. In this case, the IP address to be used can be set to only the IP address of the terminal device 23, only the IP address of the communication control device 22, or both IP addresses, and the setting can be changed as necessary. Good. Alternatively,
The main control unit 226 may determine which to use depending on the situation and switch the mode.

For example, at present, an IP address is often used in the IPv4 protocol. However, IPv4
Manages address resources with 32 bits, and the maximum number of devices that can be identified is about 4.3 billion, which is small. Therefore, due to the fear that address resources will be exhausted more quickly than expected due to the rapid spread of the Internet in recent years, I
In reality, it is difficult to assign a P address. Therefore, when using IPv4, the communication control device
In some cases, the address cannot be assigned. Therefore, in that case, the IP address of the terminal device 23 is stored in the source IP address. The server 6 which has received the signal addressed to the partner device includes T included in the signal addressed to the partner device to identify the sender.
The source port number of the CP layer can be used.

On the other hand, in the future, in order to solve the IP address shortage, the address resource is managed by 128 bits, and the maximum number of devices that can be identified can be made virtually infinite.
It is expected that communication will be performed using the Pv6 protocol. According to IPv6, the IP address can be assigned to each device relatively easily. Therefore, when using IPv6, it is conceivable that an IP address can be given to the communication control device 22 as well. Therefore, in that case, the transmission source I
The IP address of the communication control device 22 is stored in the P address. The server 6 that has received the signal addressed to the partner device can use the source IP address of the IP layer included in the signal addressed to the partner device as it is for identifying the sender.

Further, the main control section 226 transmits the source MAC address and the destination MAC address included in the received signal and the transmitted signal without changing them, or transmits the source MAC address included in the received signal and the transmitted signal. Communication controller 2
Whether the MAC address of 2 is transmitted to the terminal device 23 or the server 6 can be set appropriately. In addition, the main control unit 226 also appropriately sets whether the source MAC address is the MAC address of the terminal device 23 or the MAC address of the communication control device 22 when assembling the destination device information. You can When the source MAC address included in the received signal or the transmitted signal is not replaced with the MAC address of the communication control device 22, or when the source M
When the MAC address of the terminal device 23 is used as the AC address, the communication control device 22 uses the communication control device 22.
It is possible to relay a transmission signal or a reception signal at the MAC sublayer level without using a unique MAC address.

The main control section 226 controls the MAC of the terminal device 23.
A function of using either the address or the MAC address of the communication control device 22 may be provided. Further, the main control unit 226 may have a function of using both MAC addresses. In this case, the MAC address to be used can be set to only the MAC address of the terminal device 23, only the MAC address of the communication control device 22, or both MAC addresses, and the setting can be changed as necessary. Good. Alternatively, the main control unit 226 may determine which one to use depending on the situation and switch.

For example, the server 6 on the network side and the ONUs 21a and xDSL of the subscriber home systems 2a to 2c.
Communication is performed when the MAC address is mutually recognized between the modem 21b, the CATV modem 21c, and the terminal device 23, and communication is performed while monitoring whether another device is physically connected between them. The MAC address of the controller 22 cannot be used. In such a case, the main control unit 226 needs to use the MAC address of the terminal device 23. In addition to the above, the main control unit 226 uses the abnormality detection unit 227.
From the switching control unit 228, the abnormality detection result is acquired and transmitted to the switching control unit 228.
7 is also acquired and transmitted to the abnormality detection unit 227.

The lines 230a and 230b are used for the terminal device 23.
And a communication device such as the ONU 21a, the xDSL modem 21b, the CATV modem 21c, etc. without connecting the first communication interface unit 221 and the second communication interface unit 222. The line 230a is used for upstream communication and transmits a transmission signal or the like from the terminal device 23 to the server 6. The line 230b is used for downstream communication and is used for the ONU 21a, the xDSL modem 21b, and the CAT.
Received signals and the like received by the V-modem 21c from the server 6 are transmitted. Both ends of the lines 230a and 230b are connected to the relay 22.
9a and 229b.

The relay 229a is connected to the ONU 21a and xDS.
The connection destinations of the communication devices such as the L modem 21b and the CATV modem 21c are the first communication interface unit 221 and the line 23.
0a, 230b, the relay 229b,
The connection destination of the terminal device 23 is the second communication interface unit 2
22 is a switching unit that switches between the line 22 and the lines 230a and 230b. The relay 229a includes the first communication interface unit 221, lines 230a and 230b, and 10 /
ONU21 via 100BASE-T cable 251
a, xDSL modem 21b, CATV modem 21c are connected, and turned on according to the instruction of the switching control unit 228.
U21a, xDSL modem 21b, CATV modem 21
Switch the connection destination of c. The relay 229b includes the second communication interface unit 222 and the lines 230a and 230b.
And is connected to the terminal device 23 via the 10 / 100BASE-T cable 252, and switches the connection destination of the terminal device 23 according to the instruction of the switching control unit 228.

The abnormality detector 227 detects an abnormal state of the communication control device 22. The abnormality detection unit 227 cannot normally operate the communication control device 22 due to an abnormal state of the communication control device 22, such as a failure or a power failure of the communication control device 22 or a voltage drop when operating with external power supply. Detect the situation. When the abnormality detection unit 227 detects an abnormal state,
The switching control unit 228 is notified of the detected abnormal state via the main control unit 226. Also, the abnormality detection unit 227
May detect a change after detection of the abnormal state and notify the switching control unit 228. The notification of the change may be performed periodically, or an instruction from the switching control unit 228 may be acquired via the main control unit 226 and may be performed according to the instruction. The change in the abnormal state detected by the abnormality detecting unit 227 includes, for example, elimination of the abnormal state and restoration to a normal state, occurrence of another abnormal state, deterioration of the abnormal state, and the like.

The switching control unit 228 is used by the abnormality detection unit 22.
The relays 229a and 229b are controlled based on the detection result of No. 7. The switching control unit 228 uses the abnormality detection unit 227.
When the ONU 21a and the xDSL modem 21 receive a notification from the main control unit 226 regarding the detection of an abnormal state.
b, the connection destination of the communication device such as the CATV modem 21c is the first.
From the communication interface unit 221 to the lines 230a, 23
The relays 229a and 229b are instructed to switch the connection destination of the terminal device 23 from the second communication interface unit 222 to the lines 230a and 230b.

Further, the switching control section 228 notifies the main control section 22 from the abnormality detection section 227 that the abnormal state has been resolved and the normal state has been restored.
ONU 21a, xDSL modem 2 when received via
1b, the connection destination of the communication device such as the CATV modem 21c is switched from the lines 230a and 230b to the first communication interface unit 221, and the connection destination of the terminal device 23 is changed to the line 230.
The relays 229a and 229b may be instructed to switch from the a, 230b to the second communication interface unit 222. Further, the switching control unit 228 uses the abnormality detection unit 2
When the notification of the detection of the abnormal state is received from 27, the abnormality detection unit 227 may be instructed to notify the subsequent change of the abnormal state.

The abnormality detecting section 227, the switching control section 228, the relays 229a and 229b, the line 230 as described above.
According to a, 230b, even if some abnormality occurs in the communication control device 22, the terminal device 23 and the ONU 21a,
The xDSL modem 21b and the CATV modem 21c can be connected via the lines 230a and 230b, and the communication between the terminal device 23 and the server 6 can be continued. for that reason,
It is possible to minimize the influence on other devices configuring the communication systems 1a to 1c.

[Communication Method] Next, the communication systems 1a to 1
A communication method performed by using b will be described. First, the procedure for establishing a data link will be described. FIG. 11 is a sequence diagram showing a procedure for establishing a data link according to the embodiment of the present invention. As shown in FIG. 11, first, ON
U21a and line accommodation device 4a, xDSL modem 21b and line accommodation device 4b, CATV modem 21c and head end 4c, line accommodation device 4a and server 6, line accommodation device 4b and server 6, head end 4c and server 6 And each connect using the ATM layer (S10
1).

Next, the terminal device 23 and the communication control device 22, the communication control device 22 and the ONU 21a, the communication control device 22 and the xDSL 21b, the communication control device 22 and the CATV.
The modem 21c is connected to each other using Ethernet (Ethernet), the ONU 21a and the server 6,
xDSL modem 21b and server 6, CATV modem 21
c and the server 6 are connected using the AAL 5 and the bridge (S102). Next, the terminal device 23 and the communication control device 22 are connected to each other, and the communication control device 22 and the server 6 are connected to each other using PPPoE (S103). Finally, the terminal device 22 and the communication control device 22, and the communication control device 22 and the server 6 are connected using PPP respectively, and the communication control device is connected between the terminal device 23 and the communication control device 22. An independent data link is established between the server 22 and the server 6 (S104). That is, the terminal device 23 and the communication control device 22 are directly connected, and the communication control device 22 and the server 6 are directly connected.

Next, a communication method in normal time when the alarm terminal device 24 does not detect an abnormality will be described. Figure 1
FIG. 2 is a sequence diagram showing a procedure of a communication method in normal times according to the embodiment of the present invention. 12 to 15, the IPv4 IP packet 200a will be described as an example. Step (S201) to step (S20)
4) is step (S101) to step (S104)
Similar to the above, first, the data link is established.

Next, the terminal device 23 transmits a transmission signal including the IP packet 200a addressed to the server 6 (S2).
05). The transmission control unit 224b of the communication control device 22 acquires the transmission signal via the second interface unit 222, and the uplink signal information processing unit 225b extracts Et from the transmission signal.
The Ethernet (Ethernet) frame 100 is taken out and transmitted to the main control unit 226. The main control unit 226 uses the E
IP packet 200 from the Internet frame 100
The transmission control unit 224b is instructed to take out a and transmit the transmission signal including the IP packet 200a to the server 6 represented by the transmission destination IP address of the IP header 201, the transmission destination port number of the TCP header 301, and the like. Then, the transmission control unit 224b causes the first communication interface unit 221 to
The transmission signal including the IP packet 200a is transmitted to the server 6 via the server 6 and is received by the server 6 (S206).

When the server 6 receives the transmission signal from the terminal device 23, the IP packet 200 of the response thereto is received.
A signal including b is transmitted to the terminal device 23 (S2
07). The signal transmitted from the server 6 is the ONU 21a
And a reception control unit 224a of the communication control device 22 which is received by the xDSL modem 21b and the CATV modem 21c.
Is turned on via the first communication interface unit 221.
U21a, xDSL modem 21b, CATV modem 21
The received signal received by c is acquired. The downlink signal information processing unit 225a extracts the Ethernet (Ethernet) frame 100 from the received signal and transmits it to the main control unit 226. The main control unit 226 extracts the IP packet 200b from the Ethernet frame 100, and sends the destination IP address of the IP header 201 and the TCP header 30.
See the destination port number of 1. The main control unit 226 determines that the destination IP address and the destination port number are the terminal device 23.
Therefore, the reception control unit 224a is instructed to transmit the reception signal including the IP packet 200b to the terminal device 23. Then, the reception control unit 224a uses the second communication interface unit 221.
A reception signal including the IP packet 200b is transmitted to the terminal device 23 via the (S208).

Next, a communication method at the time of abnormality when the alarm terminal device 24 detects abnormality will be described. Figure 13
It is a sequence diagram which shows the procedure of the communication method at the time of abnormality which concerns on embodiment of this invention. Steps (S301) to (S304) are the same as steps (S101) to (S104), and the data link is first established. Also, steps (S305) and (S306)
Is the same as steps (S205) and (S206).

When the alarm terminal device 24 detects an abnormality (S
307), and transmits the abnormality information such as the abnormality detection result to the communication control device 22 for notification (S308). The communication control device 22 acquires the notification of abnormality information from the alarm terminal device 24 via the alarm terminal interface unit 223. The main control unit 226 stores the abnormality information in the data 301 of the TCP packet 300, and the TCP header 301 and the IP header 2
01 is added to assemble the IP packet 200c.
Finally, the main control unit 226 determines that the Ethernet header 1
01 is added to the IP packet 200c, and the
Assembling the et frame 100, the upstream signal information processing unit 2
25b. The upstream signal information processing unit 225b uses the I
A signal addressed to the partner device including the P packet 200c is generated and transmitted to the transmission control unit 224b. In addition, the main controller 226
Destination IP of the IP header 201 of the IP packet 200c
The transmission control unit 224b is instructed to transmit the signal addressed to the partner device including the IP packet 200c to the server 6 represented by the address, the destination port number of the TCP header 301, and the like. Then, the transmission control unit 224b transmits a signal addressed to the partner device including the IP packet 200c to the server 6 via the first communication interface unit 221 (S309).

Since the server 6 receives the transmission signal from the terminal device 23 first (S306), the server 6 transmits the signal including the IP packet 200b in response to the signal to the terminal device 23 (S310). The signal transmitted from the server 6 is the ONU 21a, the xDSL modem 21b, the CA.
The communication control device 22 is received by the TV modem 21c.
Of the ONU 21a or the xDSL modem 21 via the first communication interface unit 221.
b, the received signal received by the CATV modem 21c is acquired. Then, the main control unit 226, the IP packet 200b
IP packet 2 based on the destination IP address of the IP header 201 and the destination port number of the TCP header 301
The reception control unit 224a is instructed to transmit the reception signal including 00b to the terminal device 23. Then, the reception control unit 224a transmits a reception signal including the IP packet 200b to the terminal device 2 via the second communication interface unit 221.
3 (S311).

Next, the server 6 performs the step (S309).
In response to a signal addressed to the other device from the communication control device 22 received in step 1, an IP packet including instruction information such as transmission of an image in the subscriber's home, switching of surveillance cameras installed in the subscriber's home, and confirmation of a predetermined situation. Assemble 200d. Then, the server 6 sends a signal including the IP packet 200d,
The data is transmitted to the communication control device 22 (S312). The signal transmitted from the server 6 is received by the ONU 21a, the xDSL modem 21b, and the CATV modem 21c,
The reception control unit 224a of the communication control device 22 receives the ONU 21a and the xD via the first communication interface unit 221.
The reception signals received by the SL modem 21b and the CATV modem 21c are acquired.

Then, the main control section 226 determines the destination IP address of the IP header 201 of the IP packet 200d,
Looking at the destination port number of the TCP header 301, since the received signal including the IP packet 200d is addressed to the communication control device 22, the received signal is transmitted to the communication control device 22.
It is decided to process with. Next, the main control unit 226 sets the IP
Information required by the alarm terminal device 24 included in the packet 200d, that is, information such as an instruction from the server 6 is extracted. The main control unit 226 transmits the information such as the fetched instruction to the alarm terminal interface unit 223, and transmits the information to the alarm terminal device 24 to notify it. Accordingly, the main control unit 226 controls the alarm terminal device 24 (S313).

The alarm terminal device 24 takes an image and confirms the situation based on an instruction from the server 6.
The alarm terminal device 24 displays response information such as images and confirmation results,
It is transmitted to the communication control device 22 and notified (S314). The communication control device 22 acquires the notification of the response information from the alarm terminal device 24 via the alarm terminal interface unit 223. Then, the communication control device 22 performs the step (S30
IP packet 200 including response information in the same manner as 9)
e is assembled, a signal addressed to the other device including the IP packet 200e is generated and transmitted to the server 6 (S315).

Next, the alarm terminal device 24 detects an abnormality,
A communication method when giving priority to the notification of the abnormality information to the server 6 will be described. FIG. 14 is a sequence diagram showing the procedure of the communication method at the time of priority of abnormality notification according to the embodiment of the present invention. Step (S401) to Step (S
404) includes steps (S101) to (S10).
Similar to 4), the data link is first established. Next, the terminal device 23 transmits a transmission signal including the IP packet 200a addressed to the server 6 (S405).

At this point, an abnormality occurs and the alarm terminal device 24
Detects an abnormality (S406), transmits abnormality information such as the detection result of the abnormality to the communication control device 22 to notify it (S406).
407). The communication control device 22 acquires the notification of abnormality information from the alarm terminal device 24 via the alarm terminal interface unit 223. The main control unit 226 sends the abnormality information to the TC.
The P packet 300 is stored in the data 301, the TCP header 301 and the IP header 201 are added, and the IP packet 200c is assembled. At this time, the main control unit 226 determines the service type of the IP header 201 or sets the URG of the flag of the TCP header 301 to 1 so that the IP packet 200c including the abnormality information has a higher priority, and includes the emergency data. To show that. IP
In the case of v6, the main control unit 226 determines the traffic class to have a higher priority. Finally, the main control unit 226 adds the Ethernet header 101 to the IP packet 200c, and the Ethernet frame 1
00 is assembled and transmitted to the upstream signal information processing unit 225b. The upstream signal information processing unit 225b uses the IP packet 20
0c, a signal addressed to the partner device is generated, and the transmission control unit 224
b.

The main control section 226 uses the IP packet 200a.
And the service type of the IP header 201 of the IP packet 200c are compared or the flag of the TCP header 301 is checked to determine the IP packet to be transmitted to the server 6 first. Here, the main control unit 226 determines that the IP packet 200
The transmission control unit 224b transmits the signal addressed to the partner device including the IP packet 200c to the server 6 and is received by the server 6 (S408). Next, the transmission control unit 224b transmits a transmission signal including the IP packet 200a to the server 6, and the server 6 receives it (S40).
9).

Since the server 6 first receives the signal addressed to the partner device from the communication control device 22 (S408), the server 6 assembles the IP packet 200d including information such as an instruction to the alarm terminal device 24 in response thereto. Then, the server 6 uses the IP
A signal including the packet 200d is transmitted to the communication control device 22 (S410). The signal transmitted from the server 6 is the ONU 21a, the xDSL modem 21b, the CATV.
The reception control unit 224a of the communication control device 22 receives the data by the modem 21c, and the first communication interface unit 22
1 via the ONU 21a or xDSL modem 21b, C
The received signal received by the ATV modem 21c is acquired. Then, the main control unit 226 determines the IP of the IP packet 200d.
Destination IP address of header 201 or TCP header 3
Looking at the destination port number of 01, the IP packet 200d
Since the received signal including is addressed to the communication control device 22, it is determined that the communication control device 22 processes the received signal. Next, the main control unit 226 causes the IP packet 200
Information such as an instruction from the server 6 included in d is extracted, transmitted to the alarm terminal interface unit 223, and transmitted to the alarm terminal device 24 for notification (S412).

Next, the server 6 responds to the transmission signal from the terminal device 23 received later by the IP packet 20.
A signal including 0b is transmitted to the terminal device 23 (S
412). The signal transmitted from the server 6 is the ONU 21
a, an xDSL modem 21b, a CATV modem 21c, and a reception control unit 224a of the communication control device 22.
Is turned on via the first communication interface unit 221.
U21a, xDSL modem 21b, CATV modem 21
The received signal received by c is acquired. And the main controller 2
The reception control unit 224 a looks at the transmission destination IP address of the IP header 201 of the IP packet 200 b and the transmission destination port number of the TCP header 301 to transmit the reception signal including the IP packet 200 b to the terminal device 23.
And the reception control unit 224a transmits a reception signal including the IP packet 200b to the terminal device 23 via the second communication interface unit 221 (S413).

Next, a communication method for prioritizing the transmission of information from the terminal device 23 even when the alarm terminal device 24 detects an abnormality will be described. Figure 15 shows
It is a sequence diagram which shows the procedure of the communication method at the time of the terminal information priority which concerns on embodiment of this invention. Step (S501)
The steps (S504) are the same as the steps (S101) to (S104), and the data link is first established. Next, the terminal device 23 transmits a transmission signal including the IP packet 200a addressed to the server 6 (S505). Here, the IP packet 200a is V
Since the terminal device 23 includes voice information such as oIP, and information such as moving image information, whose quality deterioration is remarkable due to delayed arrival, the terminal device 23 sets the IP header 201 so that the IP packet 200a has a higher priority. The service type of In the case of IPv6, the main controller 226
Determines the traffic class to have higher priority.

At this point, an abnormality occurs and the alarm terminal device 24
Detects an abnormality (S506), the abnormality information such as the detection result of the abnormality is transmitted to the communication control device 22 to notify it (S506).
507). The communication control device 22 acquires the notification of abnormality information from the alarm terminal device 24 via the alarm terminal interface unit 223. The main control unit 226 sends the abnormality information to the TC.
The P packet 300 is stored in the data 301, the TCP header 301 and the IP header 201 are added, and the IP packet 200c is assembled. At this time, the main control unit 226 determines the service type of the IP header 201 or sets the URG of the flag of the TCP header 301 to 1 so that the IP packet 200c including the abnormality information has a higher priority, and includes the emergency data. To show that. IP
In the case of v6, the main control unit 226 determines the traffic class to have a higher priority. Finally, the main control unit 226 adds the Ethernet header 101 to the IP packet 200c, and the Ethernet frame 1
00 is assembled and transmitted to the upstream signal information processing unit 225b. The upstream signal information processing unit 225b uses the IP packet 20
0c, a signal addressed to the partner device is generated, and the transmission control unit 224
b.

The main control section 226 uses the IP packet 200a.
And the service type of the IP header 201 of the IP packet 200c are compared or the flag of the TCP header 301 is checked to determine the IP packet to be transmitted to the server 6 first. Here, the main control unit 226 determines that the IP packet 200
The transmission control unit 224b transmits the transmission signal including the IP packet 200a to the server 6,
The server 6 receives it (S508). Next, the transmission control unit 224b transmits a signal addressed to the other device including the IP packet 200c to the server 6, and the server 6 receives the signal (S50).
9).

The server 6 receives the transmission signal from the terminal device 23 first (S508), and subsequently receives the signal addressed to the partner device from the communication control device 22 (S509). Server 6
Looks at the IP header 201 and the TCP header 301 of the IP packet 200a included in the transmission signal and the IP packet 200c included in the signal addressed to the partner device, and the IP packet 2
00c is judged to contain emergency data,
By looking at the data included in the IP packet 200c, it is determined that the information is abnormal, and it is determined that the response to it should be prioritized.

Therefore, the server 6 uses the alarm terminal device 24
The IP packet 200d including the information such as the instruction to is assembled, and the signal including the IP packet 200d is transmitted to the communication control device 22 (S510). The signal transmitted from the server 6 is the ONU 21a, the xDSL modem 21b,
The reception control unit 224a of the communication control device 22 receives the data by the CATV modem 21c, and the ONU 21a or the xDSL modem 2 receives it via the first communication interface unit 221.
1b, the reception signal received by the CATV modem 21c is acquired. Then, the main control unit 226 causes the IP packet 200
destination IP address of the IP header 201 of d or TCP
By looking at the destination port number of the header 301, the received signal including the IP packet 200d is addressed to the communication control device 22, so it is determined that the communication control device 22 processes the received signal. Next, the main control unit 226 extracts information such as an instruction from the server 6 included in the IP packet 200d, transmits it to the alarm terminal interface unit 223, and transmits it to the alarm terminal device 24 to notify it (S51).
1).

Next, the server 6 sends to the terminal device 23 a signal including the IP packet 200b in response to the transmission signal from the terminal device 23 (S512). The signal transmitted from the server 6 is received by the ONU 21a, the xDSL modem 21b, and the CATV modem 21c,
The reception control unit 224a of the communication control device 22 receives the ONU 21a and the xD via the first communication interface unit 221.
The reception signals received by the SL modem 21b and the CATV modem 21c are acquired. Then, the main control unit 226 looks at the destination IP address of the IP header 201 of the IP packet 200b and the destination port number of the TCP header 301,
The terminal device 23 receives the received signal including the IP packet 200b.
The reception control unit 224a is instructed to transmit the received signal including the IP packet 200b to the terminal device 23 via the second communication interface unit 221 (S513).

[Operations and Effects of Communication System, Communication Control Device, Communication Method] According to the communication systems 1a to 1c, the communication control device 22, and the communication method according to the embodiment of the present invention, the first communication is performed. Interface part 221 is ON
U21a, xDSL modem 21b, CATV modem 21
Since the second communication interface unit 222 is connected to the terminal device 23 by connecting to the communication device such as c, the communication control device 2
2 is a terminal device 23, ONU 21a, xDSL modem 2
1b, CATV modem 21c and other communication devices. Therefore, even if the physical line on the network side is the optical fiber 3a, the communication control device 22
Either the two-core metallic cable 3b or the coaxial cable 3c can be connected. That is, the communication system 1a-
1c can connect the same communication control device 22 even if the physical lines are different. The physical line is not limited to a wired line, and may be a wireless line.

Further, the reception control section 224a acquires, via the first communication interface section 221, a reception signal received by the communication device such as the ONU 21a, the xDSL modem 21b, the CATV modem 21c from the server 6 and outputs the downlink signal information. Ether included in the received signal by the processing unit 225a
The t frame 100 is taken out, and the main control unit 226 sets Eth.
Ethernet header 101, IP headers 201 and 211 and TCP header 30 included in the Ethernet frame
Based on the control information such as 1, the reception control unit 224a is instructed to control the transmission of the reception signal to the terminal device 23 via the second communication interface unit 222.

Further, the transmission control section 224b uses the terminal device 23.
The transmission signal transmitted from the second communication interface unit 222 is acquired, and the uplink signal information processing unit 225b is acquired.
Takes out an Ethernet frame included in the transmission signal, and the main control unit 226 causes the Ethernet header 101 and the IP header 2 included in the Ethernet frame.
Regarding the transmission of the transmission signal to the server 6 via the first communication interface unit 221, the transmission control unit 224b based on the control information 01, 211, the TCP header 301, and the like.
Instruct and control.

Therefore, the communication control device 22 is provided with the first communication interface unit 221 and the second communication interface unit 222, so that the terminal device 23 and the server 6 are provided.
The connection between the terminal device 23 and the communication control device 22 is performed to control the acquisition of the transmission signal, the transmission of the reception signal, etc., and the reception between the communication control device 22 and the server 6. It is possible to perform control such as acquisition of signals and transmission of transmission signals. That is, the communication control device 22 can individually and independently control the communication between the terminal device 23 and the communication control device 22 and the communication between the communication control device 23 and the server 6. Therefore, the communication control device 22 can control the communication between the terminal device 23 and the server 6 between them.

As described above, the communication control device 22 controls the communication between the terminal device 23 and the communication control device 22 and the communication between the communication control device 22 and the server 6 individually and independently. Therefore, even if the communication speed is high, the control can be sufficiently performed. Further, the communication control device 22 uses the terminal device 2
3 is distributed to the reception control unit 224a, the transmission control unit 224b, the downlink signal information processing unit 225a, the uplink signal information processing unit 225b, and the main control unit 226. Do it. Therefore, even if the communication speed is high, technically relatively easily control of communication can be realized. In addition, since the communication systems 1a to 1c use the ONU 21a, the xDSL modem 21b, and the CATV modem 21c as communication devices, high speed communication is possible.

Further, the main control unit 226 assembles the destination device information addressed to the server 6, and the upstream signal information processing unit 225.
b generates a signal addressed to the partner device. Therefore, the communication control device 22 itself can generate a signal addressed to the server 6. Further, the main control unit 226 sends the signal to the partner device and the transmission signal to the server 6 via the first communication interface unit 221 based on the control information included in the signal addressed to the partner device and the control information included in the transmission signal. Control the transmission of. Therefore, the communication control device 22 can control the transmission of the signal addressed to the server 6 by itself and the transmission signal addressed by the terminal device 23 to the server 6 to the server 6.

Further, the communication control device 22 comprises an alarm terminal interface section 223 connected to the alarm terminal device 24. Therefore, the communication control device 22 and the terminal device 23
NU21a, xDSL modem 21b, CATV modem 2
1c and other communication devices, and by providing an alarm terminal interface unit 223, the terminal device 23 and the IP
An alarm terminal device 24 can be connected to the communication network 5. That is, the communication control device 22 uses the alarm terminal device 24.
A device other than the terminal device 23 that requires high reliability such as
It is possible to connect to the IP communication network 5 together with the terminal device 23.

Further, the main control unit 226 extracts the information required by the alarm terminal device 24 from the received signal, and transmits it to the alarm terminal device 24 via the alarm terminal interface unit 223, so that the alarm terminal device 24 is activated. Can be controlled.

Further, the main control unit 226 obtains abnormality information from the alarm terminal device 24 via the alarm terminal interface unit 223, response information to the instruction from the server 6, and the like, and based on these information, the other device Assemble address information,
The upstream signal information processing unit 225b can generate a signal addressed to the partner device. Therefore, it is possible to notify the server 6 of the abnormality information and the response information acquired from the alarm terminal device 24.

Further, the main control section 226 uses the I as the control information.
The control is performed using the IP layer control information such as the information included in the P headers 201 and 211. Therefore, the communication control device 22 determines whether the transmission signal, the reception signal, or the destination device is included in the IP headers 201 and 211 based on the information indicating the priority order such as the destination address and the source address, the service type and the traffic class, and the like. The signal transmission can be controlled.

Further, the main control section 226 uses T as the control information.
Control can also be performed using TCP layer control information such as information included in the CP header 301. Therefore, the communication control device 22 determines the transmission signal, the reception signal, and the partner device based on the information indicating whether or not the transmission destination port number and the transmission source port number included in the TCP header 301 include emergency data such as a flag. It becomes possible to control the transmission of the addressed signal. Furthermore, since the TCP layer is an upper layer than the IP layer, the communication control device 22 can perform higher-level fine control.

Further, the main control section 226 uses the PPPoE, PP
It has a communication control function of establishing a data link between the terminal device 23 and the communication control device 22 and a data link between the communication control device 22 and the server 6 by using P. Therefore, the communication control device 22 establishes a data link with the terminal device 23, and the communication control device 22 and the terminal device 23.
It can take the form in which and are directly connected. Similarly, the communication control device 22 can take the form of establishing a data link with the server 6 so that the communication control device 22 and the server 6 are directly connected.
Therefore, the communication control device 22, in such a form, performs communication between the terminal device 23 and the communication control device 22,
The communication between the communication control device 22 and the server 6 can be controlled independently.

[Modification] The present invention is not limited to the above embodiment, but various modifications can be made. Figure 1
FIG. 6 is an explanatory diagram showing a configuration of a communication protocol of the communication system according to the modified example of the present invention. The communication system according to this modification includes a terminal device 423, a communication control device 422, and xD.
Except for the SL modem 421, it is the same as the communication system 1b according to the above embodiment.

The xDSL modem 421 is a router type xDSL modem capable of connecting a plurality of terminal devices and having an IP layer level routing function. The communication protocol of the xDSL modem 421 is from the lower order to the higher order.
The communication control device 422 side is 10 / 100BASE-T,
It is composed of Ethernet (IP) and IP layers, and the network side is a two-core metallic cable, ATM layer, AAL5, bridge, Ethernet.
t (Ethernet), PPPoE, PPP, IP.

As described above, the xDSL modem 421 has the P
Since it has the layers PPoE, PPP, and IP, PPPo
By using E and PPP, a data link can be established with the server 6 and communication with the server 6 at the IP layer level can be performed. Therefore, when a communication device such as a router type xDSL modem 421 is used, the communication control device 4
22 can omit the communication control function of establishing a data link with the server 6 and communicating by using PPPoE or PPP.

As a result, as shown in FIG. 16, the communication protocols of the communication control device 422 are as follows.
10 / 100BASE-T, Ethernet, IP,
It is composed of a layer called TCP. According to this, xDSL
Since the communication protocol on the communication control device 422 side of the modem 421 is also composed of layers such as 10 / 100BASE-T, Ethernet (Ethernet), and IP, the communication control unit of the communication control device 421 uses Ethernet to A data link can be established with the xDSL modem 421.

Further, the communication control device 422 uses the PPPoE,
Since the communication control function for establishing a data link and communicating with the server 6 using PPP is omitted, the terminal device 4
23 also uses PPPoE, PPP to communicate control device 4
It is possible to omit the communication control function for establishing a data link with 22 and performing communication. As a result, as shown in FIG. 16, the communication protocol of the terminal device 423 is 10 / 100BASE-T, Ethernet in order from the lower order to the higher order.
It is composed of t, IP, and TCP layers. According to this, the communication control unit of the communication control device 422 is
By using et, a data link can be established with the terminal device 423.

The procedure of the communication method in this communication system is as shown in FIG. FIG. 17 is a sequence diagram showing the procedure of the communication method of the communication system according to the modification of the present invention. As shown in FIG. 17, first, the xDSL modem 421 and the line accommodation device 4b are connected to each other.
b and the server 6 are connected to each other using the ATM layer (S601). Next, the terminal device 423 and the communication control device 422, and the communication control device 422 and the xDSL 421.
Are connected to each other using Ethernet (Ethernet), and the xDSL modem 421 and the server 6 are connected to each other.
Connect using AAL5 and bridge (S60
2). Accordingly, the terminal device 423 and the communication control device 42
The data link with 2 is established.

Next, the xDSL modem 421 and the server 6 connect using PPPoE (S603). Finally, the xDSL modem 421 and the server 6 connect using PPP, and a data link is established between the xDSL modem 421 and the server 6 (S604). After that, the terminal device 423 sends the IP packet 200a addressed to the server 6 to the server 6.
A transmission signal including is transmitted (S605). The communication control device 422 acquires the transmission signal, and transmits the IP packet 200a to the server 6 represented by the transmission destination IP address of the IP header 201 included in the IP packet 200a, the transmission destination port number of the TCP header 301, and the like from the transmission signal. A transmission signal including the signal is transmitted (S606). Upon receiving the transmission signal including the IP packet 200a from the communication control device 422, the xDSL modem 421 receives the I signal included in the IP packet 200a.
The routing processing is performed based on the destination IP address of the P header, and the transmission signal including the IP packet 200a is transmitted to the server 6 (S607).

According to this, since the xDSL modem 421 has established the data link with the server 6, the communication control unit of the communication control device 422 is able to operate the xDSL modem 421.
A data link is established between the server 6 and the transmission signal server 6
Transmission to the xDSL modem 421 may be controlled. As a result, a transmission signal controlled by the communication control unit of the communication control device 422 is transmitted from the xDSL modem 421 to the server 6, and the communication control device 422 connects the terminal device 423 and the server 6 to the terminal device 423. Server 6
Control the communication to and from.

The communication control device 522 shown in FIG. 18 may be used in place of the communication control device 22. FIG. 18 is a block diagram showing the configuration of the communication control device 522 according to the modification of the present invention. In the communication control device 522, the main control unit 5226 performs all the processes performed by the downlink signal information processing unit 225a, the uplink signal information processing unit 225b, and the main control unit 226 in the communication control device 22. According to this, the configuration of the communication control device 522 can be simplified. The communication control device 522 is substantially the same as the communication control device 22 according to the above-mentioned embodiment except for the main control unit 5226, and thus the same reference numerals as those in FIG. .

[0167]

As described above, according to the present invention,
A communication control device that can control communication between a terminal device and a partner device with which the terminal device communicates via a network, and can be connected without being affected by a physical line on the network side, and its communication A communication system and a communication method using a control device can be provided. According to another invention, a communication control device capable of controlling by connecting another terminal device between the terminal device and the network,
A communication system and communication method using the communication control device can be provided.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a communication system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of another communication system according to the exemplary embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a configuration of still another communication system according to the exemplary embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a configuration of a communication protocol of the communication system according to the exemplary embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a configuration of a communication protocol of another communication system according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a configuration of a communication protocol of still another communication system according to the embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a communication control device according to an embodiment of the present invention.

FIG. 8 is an explanatory diagram illustrating an Ethernet frame according to the embodiment of the present invention. Is.

FIG. 9 is an explanatory diagram illustrating a packet format of an IP packet according to the embodiment of the present invention.

FIG. 10 is an explanatory diagram illustrating a packet format of a TCP packet according to the embodiment of the present invention.

FIG. 11 is a sequence diagram showing a procedure for establishing a data link according to the embodiment of the present invention.

FIG. 12 is a sequence diagram showing a procedure of a communication method in normal times according to the embodiment of the present invention.

FIG. 13 is a sequence diagram showing a procedure of a communication method at the time of abnormality according to the embodiment of the present invention.

FIG. 14 is a sequence diagram showing a procedure of a communication method at the time of priority of abnormality notification according to the embodiment of the present invention.

FIG. 15 is a sequence diagram showing a procedure of a communication method when terminal information is prioritized according to the embodiment of the present invention.

FIG. 16 is an explanatory diagram showing a configuration of a communication protocol of a communication system according to a modified example of the present invention.

FIG. 17 is a sequence diagram showing a procedure of a communication method of a communication system according to a modified example of the present invention.

FIG. 18 is a block diagram showing a configuration of a communication control device 522 according to a modification of the present invention.

FIG. 19 is an explanatory diagram showing a configuration of a conventional communication system.

FIG. 20 is an explanatory diagram showing a configuration of a communication protocol of a communication system using a conventional IP communication network.

FIG. 21 is an explanatory diagram showing a configuration of a communication protocol of a communication system using a conventional IP communication network.

FIG. 22 is an explanatory diagram showing a configuration of a communication protocol of a communication system using a conventional IP communication network.

FIG. 23 is a sequence diagram showing a procedure of a communication method in a communication system using a conventional IP communication network.

FIG. 24 is an explanatory diagram showing a configuration of a communication protocol of another communication system using the conventional IP communication network.

FIG. 25 is a sequence diagram showing a procedure of a communication method in another communication system using the conventional IP communication network.

[Explanation of symbols]

1a, 1b, 1c, 601 Communication system 2a, 2b, 2c, 602 Subscriber home system 3a Optical fiber 3b, 603, 625 Two-core metallic cable 3c Coaxial cable 4a, 4b, 604, 703a, 703b Line accommodation device 4c, 703c Head End 5 IP communication network 6,606,704 Server 7b, 27b Splitter 7c, 21c, 702c CATV modem 8b Telephone network 8c Gateway 9c Video server 10c Receiver 21a, 702a ONU 21b, 421, 702b, 701, 802 xDSL
Modem 22, 422, 522, 621 Communication control device 23, 423, 623, 801 Terminal device 24, 624 Alarm terminal device 26, 627 Cable 27c Distributor 28b Subscribed telephone terminal device 28c CATV tuner 29c Television 100 Ethernet frame 101 Ethernet header 102 Ethernet payload 104 PPPoE header 200, 210, 200a to 200e IP packet 201, 211 IP header 202, 212, 302 Data 221 First communication interface unit 222 Second communication interface unit 223 Alarm terminal interface unit 224a Reception control unit 224b Transmission Control unit 225a Downstream signal information processing unit 225b Upstream signal information processing unit 226, 5226 Main control unit 227 Abnormality detection unit 228 Switching control unit 22 9a, 229b Relay 230a, 230b Line 251, 252 10/100 BASE-T cable 300 TCP packet 301 TCP header 605 ISDN communication network 622 DSU 626 4 core metallic cable

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuaki Tone             1-12-1 Dogenzaka, Shibuya-ku, Tokyo NTT Corporation             T Electronics Co., Ltd. (72) Inventor Yasuhisa Ikeda             1-12-1 Dogenzaka, Shibuya-ku, Tokyo NTT Corporation             T Electronics Co., Ltd. F-term (reference) 5K030 GA05 JL08 KA13                 5K034 AA20 FF02 HH06 KK21 KK27

Claims (12)

[Claims] 1. A communication control unit for controlling communication between a terminal device and a partner device with which the terminal device communicates via a network, the communication device being provided on the terminal device side and being connected to the network, the partner device. A first communication interface unit connected to a communication device that transmits and receives signals to and from a previous terminal device, and the communication control unit receives the communication device from the partner device. The received signal is obtained via the first communication interface unit, the transmitted signal transmitted from the terminal device is obtained via the second communication interface unit, and control information included in the received signal is obtained. The transmission of the received signal to the terminal device via the second communication interface unit, based on the control information contained in the transmitted signal. A communication control device for controlling transmission of a transmission signal to the partner device via the first communication interface unit. 2. The communication control unit generates a signal addressed to the partner device addressed to the partner device, and based on control information included in the signal addressed to the partner device and control information included in the transmission signal, the partner device. The communication control device according to claim 1, wherein transmission of the device-destined signal and the transmission signal to the partner device via the first communication interface unit is controlled. 3. A third communication interface unit for connecting to a terminal device other than the terminal device, wherein the communication control unit extracts information required by the other terminal device from the received signal, The communication control device according to claim 1, wherein the communication control device transmits to the other terminal device via the third communication interface unit. 4. The communication control unit acquires information from the other terminal device via the third communication interface unit, and based on the acquired information, transmits a signal addressed to the partner device to the partner device. Generated to the partner device via the first communication interface unit of the partner device signal and the transmission signal based on the control information contained in the partner device signal and the control information contained in the transmission signal The communication control device according to claim 3, wherein the communication control device controls the transmission of the. 5. The communication control device according to claim 1, wherein the communication control unit performs control using IP layer control information as the control information. 6. The communication control device according to claim 1, wherein the communication control unit performs control using TCP layer control information as the control information. 7. The communication control unit establishes a data link between the terminal device and the communication control device and a data link between the communication control device and the partner device. The communication control device according to claim 1. 8. When the communication device establishes a data link with the partner device, the communication control unit includes a data link between the terminal device and the communication control device, and the communication control device. 7. The communication control device according to claim 1, wherein a data link between the communication control device and the communication device is established. 9. The communication control unit includes a source MAC address and a destination MAC of control information included in the received signal.
The reception signal is transmitted to the terminal device via the second communication interface unit without changing the address, and the transmission source MAC address and the transmission destination MAC address of the control information included in the transmission signal are not changed. 9. The communication control device according to claim 1, wherein the transmission signal is transmitted to the partner device via the first communication interface unit. 10. A line that connects the terminal device and the communication device without using the first communication interface unit and the second communication interface unit, and a connection destination of the communication device is the first line. A switching unit that switches between a communication interface unit and the line, and switches a connection destination of the terminal device between the second communication interface unit and the line, and an abnormality detection unit that detects an abnormal state of the communication control device. 10. The communication control device according to claim 1, further comprising: a switching control unit that controls the switching unit based on a detection result of the abnormality detection unit. 11. A communication system for controlling communication between a terminal device and a partner device with which the terminal device communicates via a network, the terminal device being provided on the terminal device side, and being connected to the network. A communication device that is connected to perform signal transmission / reception with the partner device; and a communication control device that is provided between the terminal device and the communication device and that controls communication between the terminal device and the partner device, The communication control device, a first communication interface unit connected to the communication device, a second communication interface unit connected to the terminal device, a reception signal received by the communication device from the partner device,
Acquired via the first communication interface unit, the transmission signal transmitted from the terminal device is acquired via the second communication interface unit, based on control information included in the received signal, Controlling transmission of a reception signal to the terminal device via the second communication interface unit, and based on control information included in the transmission signal, the transmission signal via the first communication interface unit. A communication system comprising: a communication control unit that controls transmission to a partner device. 12. A communication method using a communication control device for controlling communication between a terminal device and a partner device with which the terminal device communicates via a network, the communication control device comprising: A terminal device, which is provided on the terminal device side, acquires a reception signal received by the communication device from the partner device between a communication device that is connected to the network and transmits and receives a signal to and from the partner device, Obtain a transmission signal transmitted from, based on the control information included in the reception signal, control the transmission of the reception signal to the terminal device, based on the control information included in the transmission signal, the transmission A communication method comprising controlling transmission of a signal to the partner device.