JP2003152757A - Receptacle with lan switch function and network setting method in power line communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a receptacle with a LAN switch function and a network setting method convenient for building up a wiring system in an office floor. SOLUTION: The power line communication router 1 is connected to a terminal 4 via a receptacle 2 with a LAN switch function. The power line communication router 1 issues an IP address to each terminal 4 so that the range of IP addresses is not in duplicate via the receptacle 2 with the LAN switch function. The receptacle 2 with the LAN switch function gives one issued IP address to one terminal 4. Further, the power line communication router 1 is provided with an inter-network routing function for IP packets. Moreover, the receptacle 2 with the LAN switch function has a switching function of the IP packets. A UPS (uninterrupted power supply) 3 with a power line communication function separately supplies power and an information signal to the terminals 4 and acts like an uninterrupted power supply.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outlet having a LAN switch function and a network setting method in a power line communication system which is convenient when constructing a wiring system on an office floor.

[0002]

2. Description of the Related Art Conventionally, for example, in order to construct a power and information wiring system on an office floor, a power wiring system is laid by a distribution board or a power cable as an interior construction work of a building, and an information wiring system is a communication system. Router as construction,
Each work was carried out separately, such as laying HUB and information cables.

[0003]

[Problems to be Solved by the Invention] For example, since the construction work is divided into two parts, such as interior work and communication work, it takes time to adjust each work implementation plan, and floor materials such as in the case of a free access floor are used. Since it had to be peeled off every time construction was carried out, the construction period could be lengthened.

When the floor layout is changed, it is necessary to reconstruct the information wiring system. Further, the network system administrator needs to reconfigure the network such as reallocating the IP address and re-understand the system configuration. As described above, when moving the position of the terminal, especially when frequently moving the position of the terminal, there is a problem that the expenditure for the infrastructure construction work is large and the burden on the network system administrator is large. there were.
The present invention has been made in view of the above circumstances, and an object thereof is to provide an outlet with a LAN switch function and a network setting method in a power line communication system, which is convenient when constructing a wiring system on an office floor.

[0005]

The present invention has been made to achieve the above object, and the present invention is to provide a plurality of terminals connected by a power line that carries a superposed wave in which an information signal is superposed on an electric power carrier. An outlet with a LAN switch function for relaying between an information device and an information device, the separating / superposing means for separating an information signal from the superimposed wave and superimposing the information signal on an electric power carrier, the MAC address of each terminal, MAC that describes the correspondence with the port to which the terminal is connected
When the storage unit that stores the address table and the IP packet including the destination MAC address are received via the separation / superposition unit, the MAC address table and the IP
From the destination MAC address of the packet, recognize the port connected to the terminal that is the destination of the IP packet,
Switching means for transmitting the IP packet via the recognized port and the separating / superimposing means.

As a result, IP packets can be efficiently exchanged between the terminals. In particular, when exchanging information between terminals connected to the same outlet with the LAN switch function, packets are not transmitted before the outlet with the LAN switch function, which leads to prevention of increase in unnecessary network traffic.

Further, in the present invention, in the above invention, IP address requesting means for transmitting information regarding the number of IP addresses to be issued to the information equipment through the separating / superimposing means, and a plurality of information issued by the information equipment. Received via the separating / superimposing means, and the received I
And an IP address assigning means for transmitting the P address to the terminal via the separating / superimposing means.

As a result, the power line communication router can recognize the number of IP addresses to be issued. As an effect, since the outlet having the LAN switch function notifies the number of IP addresses on behalf of a plurality of terminals, it is possible to prevent network congestion that occurs when each terminal requests the issuance of an IP address.

Further, the present invention is a switching method implemented by an outlet having a LAN switch function for relaying a plurality of terminals connected by a power line carrying a superposed wave in which an information signal is superposed on a power carrier and a power line communication router. Then, the process of storing the MAC address table in which the correspondence between the MAC address of each terminal and the port to which the terminal is connected is stored, and the information signal is separated from the superimposed wave from the terminal, and the separation is performed. An IP packet included in the information signal and including a destination MAC address
When the packet is received, the IP address of the IP is determined from the MAC address table and the destination MAC address of the IP packet.
Recognizing a port connected to a terminal which is a destination of the packet and transmitting the information signal including the IP packet by superimposing the information signal including the IP packet on the power carrier through the recognized port. And

[0010]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. First, power line communication will be described. Power line communication is a communication method in which a superposed wave in which an information signal is superposed on a power carrier is carried using a power line so that communication can be performed without separately disposing a communication line. In this embodiment, a network is constructed using this power line communication method.

FIG. 1 is a diagram for explaining the system configuration of this embodiment. In this figure, 1 is a power line communication router. The power line communication router 1 is connected to the power main line,
Each power line communication router 1 has a plurality of LANs (Lo
cal Area Network) The outlet 2 with a switch function is connected. The power line communication router 1 has a function of managing an IP address given to each terminal 4. The power line communication router 1 also has a function of routing IP packets (information signals) between networks. These functions will be described later. The power trunk line to which the power line communication router 1 is connected carries a superposed wave in which an information signal is superposed on a power carrier. Therefore, the power line communication router 1 obtains electric power and an information signal by the superposed wave.

The outlet 2 with LAN switch function has a plurality of outlet ports, and each outlet port has
UPS (Uninterrupted Pos.) With power line communication function described later
wer Supply, uninterruptible power supply) 3 is connected. L
The outlet 2 with the AN switch function has a function of assigning the IP address assigned by the power line communication router 1 to each terminal 4. Further, the outlet 2 with a LAN switch function also has a switching function of IP packets between terminals. These functions will be described later.

The power line communication router 1 is connected to the outlet 2 having a LAN switch function, and the power line carries a superposed wave in which an information signal is superposed on a power carrier. Therefore, the outlet 2 with the LAN switch function obtains electric power and information signal by the superposed wave.

Reference numeral 3 is a UPS with a power line communication function. The UPS 3 with a power line communication function has a function of separating and demodulating an information signal from a superposed wave and separately supplying the power and the information signal to the terminal 4. Further, it has a function of superimposing the information signal transmitted from the terminal 4 on the electric power carrier wave and transmitting it to the outside. In this embodiment, in order to transmit the information signal, 10Ba
It is assumed that the se-T connects the UPS 3 with the power line communication function and the terminal 4.

Reference numeral 4 is a terminal such as a personal computer. 5 is a network, which is not shown,
Terminal 4 connected to outlet 2 with AN switch function
Etc. Reference numeral 7 denotes a commercial power supply source. However, in the present embodiment, the power supply source is not limited to commercial power, and private power generation or power supplied from another device or the like may be used. Reference numeral 6 is a power line communication device. As described above, the power trunk line to which the power line communication router 1 is connected carries the superimposed wave of the power carrier and the information signal. The electric power communication device 6 superimposes the information signal on the electric power carrier and provides the superposed wave to the electric power main line.

Reference numeral 8 denotes a system administrator terminal, which is a terminal for the network system administrator of this embodiment to manage and grasp the network status. The system administrator terminal 8 is connected to the power line communication router 1. Here, the configuration of each device constituting the system shown in FIG. 1 will be described.

(1) Power Line Communication Router 1 FIG. 2 is a diagram showing the configuration of the power line communication router 1. In this figure, 11 is a power line communication module, which has a function of separating and demodulating an information signal from a superimposed wave, and further modulating the information signal and superimposing it on a power carrier. 12 is an interface card. The power line communication module 11 and the interface card 12 exist as a pair, and each power line communication module 11 is connected to the outlet 2 with a LAN switch function or the power line communication router 1.

Reference numeral 13 is a memory. Reference numeral 14 denotes a flash memory, and the flash memory 14 incorporates an OS (Operating System) for a power line communication router.
In the operation of the power line communication router 1 described later, this OS program for the power line communication router is operated by the CPU (Central Processi).
It is realized by being executed by the ng unit) 15.
Reference numeral 16 denotes a power supply unit, and the electric power carrier wave separated by the power line communication module 11 is carried into the power supply unit 16 and used for the operation of each unit constituting the power line communication router 1.

The power line communication router 1 stores a routing table in the flash memory 14 or the like. This routing table contains interface cards 12
Card number and the network address of another power line communication router 1 connected to the interface card 12. The information described in the routing table is acquired when the power line communication router 1 is connected to another power line communication router 1 or the like, or the power line communication router 1 is used by another power line communication router 1
This is information acquired from the IP address included in the packet when the packet from the etc. is received, and the details will be described later.

The information signal separated by the power line communication module 11 is temporarily stored in the memory 13 received via the interface card 12 and processed by the CPU 15. Further, the power carrier waves separated by the power line communication module 11 are carried to the power supply unit 16 by the power line connecting between the power line communication modules 11. The information signal transmitted from the interface card 12 is the power supply unit 16
Is transmitted from the power line communication module 11 by being superimposed on the power carrier from

(2) Outlet 2 with LAN Switch Function Next, the configuration of the outlet 2 with LAN switch function will be described with reference to FIG. In the outlet 2 with a LAN switch function, 21 is a port power line communication module. Although not shown, the UPS 3 with a power line communication function is connected to the outlet 2 with a LAN switch function through a port, and one port power line communication module 21 is connected to one port. The port power line communication module 21 separates the information signal from the superimposed wave,
It has a function of demodulating, modulating an information signal and superimposing it on a power carrier. The outlet 2 with the LAN switch function manages the port to which the UPS 3 with the power line communication function is connected by the port number.

A pulse transformer 22 protects the PHY chip 23 and the MAC chip 24 from a surge current. 23 is a PHY chip,
Shape the waveform of the received information signal. Reference numeral 24 denotes a MAC chip, which routes the received IP packet based on the MAC address table stored in the memory 28. The MAC address table describes the port number to which the terminal 4 is connected via the UPS 3 with the power line communication function and the MAC address of the terminal 4. The information listed in the MAC address table is
This is information that the outlet 2 with the LAN switch function acquires from the MAC address included in the packet received from the terminal 4 via the UPS 3 with the power line communication function,
Details will be described later.

A power line communication module 25 has a function of separating and demodulating an information signal from a superposed wave and modulating the information signal to superimpose it on a power carrier. Reference numeral 26 is a power supply unit, and the electric power carrier wave separated by the port power line communication module 21 is carried into the power supply unit 26 and used for the operation of each unit constituting the outlet 2 with the LAN switch function.

27 is a CPU. 28 is a memory. As for the operation of the outlet 2 with a LAN switch function, which will be described later, the outlet OS with a LAN switch function stored in the memory 28 is loaded into the memory 28, and the CPU 2
It is realized by executing 7.

(3) UPS3 with Power Line Communication Function Next, the function of the UPS3 with power line communication function will be described with reference to FIG. In the UPS 3 with a power line communication function, 31 is a power line communication module, which has a function of separating and demodulating an information signal from a superposed wave and modulating the information signal and superimposing it on a power carrier. Reference numeral 32 is an input transformer, which makes the voltage of the input power carrier wave a voltage that meets the regulation. A rectifying unit 33 rectifies the output of the input transformer 32. A smoothing unit 34 smoothes the output of the rectifying unit 33 and outputs it as a pulsating direct current voltage. A storage battery 35 charges electric power.

Reference numeral 36 is a non-instantaneous-interruption changeover switch, which is SW
-A361, SW-B362, SW-C363 "O
Control N "and" OFF ". When the power is normally supplied, the non-interruptible changeover switch 36 is set to SW-A3.
61 and SW-B362 are closed, that is, the "ON" state, and SW-C363 is opened, that is, the "OFF" state. In the normal state, electric power is transferred to the terminal 4 via the input transformer 32, the rectifying unit 33, the smoothing unit 34, the inverter unit 37, the output transformer 38, and the like, and is charged in the storage battery 35. If the power transfer is interrupted despite not performing the normal termination procedure, the non-instantaneous-interruption changeover switch 36 instantly puts the SW-A 361 in the open state (OFF state). That is, SW-B36
2 is set to the “ON” state, and SW-A361 and SW-C3
63 is set to the “OFF” state. As a result, the storage battery 35
Discharge the electric power charged to. Also, the input transformer 32,
Rectifying unit 33, smoothing unit 34, power storage unit 35, inverter unit 3
7. If a failure occurs in any or all of the output transformers 38, etc., the non-instantaneous-interruption changeover switch 36 is set to SW-A3.
61 and SW-B362 in the "OFF" state, SW-C3
63 is turned on. As a result, power can be supplied to the terminal 4 while avoiding a faulty place. 37
Is an inverter unit that converts direct current (DC) discharged from the storage battery 35 into alternating current (AC). Reference numeral 38 is an output transformer, which makes the voltage of the electric power from the inverter unit 37 a voltage that meets the regulation of the terminal 4.

(4) Power Line Communication Device 6 Next, the configuration of the power line communication device 6 will be described. The configuration of the power line communication device 6 is shown in FIG. As shown in FIG. 5, the power line communication device 6 includes at least a modulation / demodulation circuit 61. The modulation / demodulation circuit 61 supplies power carriers carried by power lines from any power supply source such as commercial power 7, a router (not shown), a power distribution panel (not shown), and a private power generator (not shown) from outside the floor. Communication line, a router (not shown), a terminal adapter (not shown), and the like, which modulates and superimposes information signals from all information signal supply sources, and sends the superimposed wave of the power carrier and the information signal to the power trunk line. . Further, the modulation / demodulation circuit 61 of the power line communication device 6 can separate and demodulate the information signal from the superimposed wave carried by the power trunk line, and can carry the information signal and the power carrier wave with the communication line and the power line. This allows
The power line communication router 1 can obtain power and information signals from the power mains.

The communication system of this embodiment has the following functions: A) Automatic network setting function B) Routing function and switching function C) Network status display function Each function will be described below.

A) Automatic Network Setting Function In the network configuration shown in FIG. 6, the operation of the power line communication router 1 and the outlet 2 with a LAN switch function for automatically setting the network will be described with reference to FIGS. . In FIG. 6, there is a power line communication device 6 (not shown) between the power line communication router 1 and the commercial power source 7, and the power main line carries a superposed wave in which a communication signal is superposed on a power carrier. There is.

Here, for convenience of explanation, each of the two outlets 2 with a LAN switch function will be described as an outlet 2a with a LAN switch function and an outlet 2b with a LAN switch function. Further, the terminal 4 connected to the outlet 2a with the LAN switch function via the UPS 3 with the power line communication function is a terminal 4a, and the terminal 4 connected to the outlet 2b with the LAN switch function via the UPS 3 with the power line communication function is a terminal. 4b.

In advance, the network system administrator has set the network of the power line communication router 1 (N in the figure).
W) Set the address. The network address here is, for example, "999.999.999", and in this case, the power line communication router 1 is "999.999.999.
An IP address in the range of “000 to 999.999.999.999” can be given.

A unique address of, for example, 64 bits is assigned to the outlet 2a with LAN switch function and the outlet 2b with LAN switch function at the time of shipment. This unique address is for one LAN
One is assigned to each outlet 2 with a switch function, and each has its own address. Further, the unique address includes information on the number of outlets of the outlet 2 with the LAN switch function.

FIG. 7 is a diagram for explaining the operation when the terminal 4a changes the IP address. This kind of operation
This is performed when the power line communication router 1, the outlet 2a with a LAN switch function, and the outlet 2b with a LAN switch function find a network change in the check at the time of restart.

First, the power line communication router 1 transmits an outlet presence confirmation signal ("HelloConsent") to the outlet 2a with a LAN switch function (step S10 in FIG. 7). LAN that has received the outlet presence confirmation signal
The outlet 2a with a switch function transmits its unique address ("ReturnConsent") (step S11 in FIG. 7).

Although not shown in FIG. 7, the power line communication router 1 also transmits an outlet presence confirmation signal to the outlet 2b with a LAN switch function. The outlet 2b with the LAN switch function transmits its own unique address to the power line communication router 1. In this manner, the power line communication router 1 recognizes the number of outlets 2 with LAN switch function connected to the power line communication router 1 and collects the unique address of each outlet 2 with LAN switch function.

The power line communication router 1 which has received the unique address recognizes the number of outlets of the outlet 2a having the LAN switch function from the unique address, gives the IP addresses corresponding to the number of outlets ("AwardNW"), and transmits (Fig. 7). Step S12).

LA connected to the power line communication router 1
When the number of outlets 2 with the N switch function is plural, IP addresses are given from the smallest unique address of the outlets 2 with the LAN switch function. Here, LAN from the outlet 2b with LAN switch function
Since the outlet 2a with a switch function has a smaller unique address, it is assumed that the outlet 2a with a LAN switch function is first given an IP address.

The network address of the power line communication router 1 is, for example, "999.999.999". In that case, for example, an IP address in the range of “999.999.999.131 to 999.999.999.133” is supplied to the outlet 2a having the LAN switch function and the outlet 2 having the LAN switch function is used.
An IP address in the range of "999.999.999.148 to 999.999.999.150" is assigned to b. In this way, the power line communication router 1 prevents the IP address ranges given to the outlets 2 with LAN switch functions from overlapping.

The outlet 2a having the LAN switch function, which has received the IP address, confirms whether to change the IP address to each terminal 4a connected to the outlet 2a having the LAN switch function ("IsChangeIP"). A signal is transmitted (step S13 in FIG. 7).

Here, each terminal 4a is assumed to have transmitted an IP address change request ("ChangeIP") for reporting that it desires to change the IP address (step S14 in FIG. 7). At this time, the terminal 4a
And the MAC address that uniquely identifies the interface card of FIG.

Upon receiving the request for changing the IP address, the outlet 2a with a LAN switch function transmits an intention confirmation ("Accept") for reporting that the request for changing the IP address of each terminal 4a is confirmed to each terminal 4a ( Step S15 in FIG. 7). Further, the received MAC of each terminal 4a
The MAC address table in which the address and the port number to which the terminal 4a is connected are described in association with each other is created and stored in the memory 28a. In addition, the outlet 2a with a LAN switch function is connected to the power line communication router 1 by an IP
An address change request ("ChangeIP") is transmitted (step S16 in FIG. 7). At this time, the unique address of the outlet 2a with the LAN switch function and the MAC address of the terminal 4a are included in the transmission.

When the power line communication router 1 receives the IP address change request ("ChangeIP") and the MAC address of the terminal 4a, the table which describes the IP address and the MAC address assigned to the outlet 2a with the LAN switch function for each unique address. (Hereinafter referred to as address table) is created. An example of the creating method will be briefly described. For example, assume that an IP address in the range of "999.999.999.131 to 999.999.999.133" is assigned to the outlet 2a with a LAN switch function. Further, it is assumed that three MAC addresses are transmitted from the outlet 2a having the LAN switch function.

The outlet 2 with LAN switch function is
Since the IP address is assigned in ascending order of the terminal 4 having the smallest MAC address, the terminal having any MAC address
You can see which IP address was assigned. The power line communication router 1 associates the MAC address of each terminal 4 with the IP address "999.999.999.131 to 999.999.999.133" and assigns them to the outlet 2 with a LAN switch function.
It is described in the address table in association with the unique address of a.

Each terminal 4a transmits an IP address request ("DemandIP") to request an IP address to the outlet 2a with a LAN switch function (step S17 in FIG. 7). Outlet 2a with LAN switch function
Assigns one of the plurality of IP addresses assigned from the power line communication router 1 to one terminal 4a ("AwardIP"), and transmits it (step S18 in FIG. 7). At this time, the outlet 2a with the LAN switch function is assigned from the smallest IP address in order of the terminal 4 having the smallest MAC address. Each terminal 4a
The received IP address is set as its own IP address.

The power line communication router 1 uses the LA as described above.
As many IP addresses as the number of outlets are given to the outlet 2b with the N switch function. The outlet 2b with LAN switch function gives one IP address to one terminal 4b.

Next, another operation of assigning an IP address will be described. For example, it is assumed that a certain terminal 4a has already been set with an IP address. This terminal 4a is LA
It is assumed that the power line communication router 1 connected through the N switch function outlet 2a is further connected to the LAN switch function outlet 2b by changing the floor or the like.

The power line communication router 1, which has recognized the network change due to the check at the time of restarting, sets the network again. Since the unique address of the outlet 2a with the LAN switch function is smaller than the unique address of the outlet 2a with the LAN switch function,
First, the IP address was assigned to the terminal 4b. The IP address assigned to the terminal 4b at this time is assumed to be the IP address assigned to the terminal 4a until then.

Although the IP address is given to the terminal 4a after the IP address is given to the terminal 4b, there is a case where it is not desired to change the IP address of the terminal 4a. As described above, the operation of network setting when there are two or more terminals 4 to which the same IP address is set and one terminal 4 desires to maintain the current status of the IP address will be described with reference to FIG. .

First, the power line communication router 1 transmits an outlet presence confirmation signal ("HelloConsent") to the outlet 2a with a LAN switch function (step S20 in FIG. 8). LAN that has received the outlet presence confirmation signal
The outlet 2a with a switch function transmits a unique address ("ReturnConsent") unique to the outlet 2a with a LAN switch function, which is assigned at the time of shipment, to the power line communication router 1 (step S21 in FIG. 8).

The power line communication router 1 also sends an outlet presence confirmation signal (not shown) to the outlet 2b with a LAN switch function. The outlet 2b with a LAN switch function transmits a unique address unique to the outlet 2b with a LAN switch function, which is assigned at the time of shipment, to the power line communication router 1. Similarly to the above, the power line communication router 1 creates an outlet address table in which the correspondence relationship between the MAC address and the IP address is described, and manages which terminal 4 is given which IP address.

Here, a case where the unique address of the outlet 2b with the LAN switch function is smaller than the unique address of the outlet 2a with the LAN switch function will be described. Although not shown, the power line communication router 1 is assumed to have previously given an IP address to the terminal 4b, as described above. At this time, I assigned to the terminal 4b
The P address is the same as the IP address already assigned to the terminal 4a. At this point, since the IP address of the terminal 4a is intended to be changed, there is no contradiction that the IP addresses overlap.

After assigning the IP address for the terminal 4b to the outlet 2b with the LAN switch function, the power line communication router 1 recognizes the number of outlets of the outlet 2a with the LAN switch function from the unique address, and outputs the IP address for the number of outlets. It is given ("AwardNW") and transmitted (step S22 in FIG. 8).

Upon receiving the IP address, the outlet 2a having the LAN switch function sends a signal ("IsCha" for confirming whether or not the IP address is changed to each terminal 4a connected to the outlet 2a having the LAN switch function.
ngeIP ") is transmitted (step S23 in FIG. 8).

Here, it is assumed that the terminal 4a has transmitted a message that it wants to maintain the current status of the IP address ("NotChangeIP") (step S24 in FIG. 8). The MAC address of the terminal 4a is included in the request for maintaining the current state.

LA that has received the IP address status maintenance request
The outlet 2a with the N switch function is the IP of the terminal 4a.
An intention confirmation ("Accept") for reporting the confirmation that the request for maintaining the address status is confirmed is transmitted to each terminal 4a (step S25 in FIG. 8). Next, in the power line communication router 1,
Request to maintain the current status of IP address ("NotChangeI
P ") is transmitted (step S26 in FIG. 8). The MAC address of the terminal 4a and LAN
It is assumed that the unique address of the outlet 2a with a switch function is included. The power line communication router 1 refers to the command address table and refers to the I assigned to the terminal 4b first.
Recognize that the P address needs to be changed.

The power line communication router 1 recognizes the number of outlets of the outlet 2b with the LAN switch function from the unique address, gives new IP addresses for the number of outlets ("ReAwardNW"), and transmits it (step S27 in FIG. 8). ). L that received a new IP address
The outlet 2b with the AN switch function confirms the intention to report that the new IP address is received ("Accep
t ") is transmitted to each terminal 4a (step S in FIG. 8).
28).

Outlet 2b with LAN switch function
Gives an instruction to change the IP address to each terminal 4b connected to the outlet 2b with the LAN switch function ("D
oChangeIP ") is transmitted (step S2 in FIG. 8).
9). Each terminal 4b that receives the instruction to change the IP address
Confirms willingness to follow the instruction to change the IP address ("Accep
t ") is transmitted to the outlet 2b having the LAN switch function (step S30 in FIG. 8).

Outlet 2b with LAN switch function
In the same manner as described above, one I
Assign a P address. In addition, the power line communication router 1
Similar to the above, rewrite the information of the outlet address table. When both the terminals 4a and 4b set with the same IP address desire to maintain the current IP address, the power line communication router 1 notifies the system administrator terminal 8 to that effect. The network system administrator
Recognize and respond to duplicate IP addresses.

B) Routing Function and Switching Function Regarding the routing function of the power line communication router 1 and the switching function of the outlet 2 with the LAN switch function,
This will be described with reference to FIGS. 9 and 10.

Routing Function FIG. 9 is a diagram for explaining the routing function of the power line communication router 1. The routing operation of the power line communication router 1 will be described with reference to FIG. Here, for convenience of explanation, the network 5 is referred to as the network 5a and the network 5
b and the network 5c. Further, here, the network address of the network 5a is "999.
999.997 ", the network address of the network 5b is" 999.999.998 ", and the network address of the network 5c is" 999.999.999 ".

Further, the network 5a and the network 5
b, the power line communication module 11 connected to the network 5c is a power line communication module 11a, a power line communication module 11b, and a power line communication module 11c,
Power line communication module 11a, power line communication module 1
1b, the interface card 12 connected to the power line communication module 11c, the interface card 1
2a, the interface card 12b, and the interface card 12c will be described.

It is assumed that an IP packet whose destination network address (NW address in the figure) is "999.999.997" is transmitted from the network 5a. The power line communication module 11a of the power line communication router 1 separates and demodulates the information signal from the superimposed wave carrying the IP packet,
Interface card 12a for separated information signals only
To the memory 13 via.

The flash memory 14 stores a routing table, an example of which is shown in FIG. The routing table is a table that describes a correspondence relationship between a network address of a network and a card number of an interface card to which the network is connected. The packets received by the power line communication router 1 include
It includes the IP address of the terminal 4 that transmitted the packet, the network address of another power line communication router 1 that transferred the packet, or the IP address of another information device. When the power line communication router 1 receives a packet, the power line communication router 1 is created from the network address of the IP address included in the packet or the network address included in the packet, and the information acquired when connecting to another power line communication router 1 or the like. The routing table or the routing table created from the information included in the packet received by the power line communication router 1 is compared to determine whether the network address of the received packet is described in the routing table. If the network address is already listed in the stored routing table, the card number corresponding to the network address listed in the routing table,
The network address of the received packet is further compared to determine whether they match. If they match, nothing is done, and the received packet is transferred if necessary.
When the card number corresponding to the network address described in the routing table and the network address of the received packet do not match, the correspondence between the card number and the network address in the routing table is rewritten. If the network address of the received packet is not listed in the routing table, the correspondence relationship between the card number of the interface card that received the packet and the network address of the packet is listed in the routing table. In this way, the routing table is acquired.

First, the card number of the interface card 12 connected to the destination network of the received IP packet is recognized. Here, it is assumed that the card number of the interface card 12 connected to the destination network of the IP packet is “2”. In this case, the IP packet is transmitted to the interface card 12c having the card number "2". The IP packet is superimposed on the electric power carrier in the electric power line communication module 12c via the interface card 12c, and is transmitted to the network c.

Switching Function Next, the switching operation of the outlet 2 with the LAN switch function will be described with reference to FIG.

Here, for convenience of explanation, the three terminals 4 connected to one outlet 2 with a LAN switch function are referred to as a terminal 4a, a terminal 4b, and a terminal 4c.
The power line communication module 11 for each port to which the terminal 4a, the terminal 4b, and the terminal 4c are connected is a power line communication module for port 21a, a power line communication module for port 21b, and a power line communication module for port 21c.
In addition, the pulse transformer 22 that is a surge countermeasure against the information signals from the terminals 4a, 4b, and 4c is a PHY chip 23 that matches the waveforms of the information signals from the pulse transformer 22d, the terminals 4a, 4b, and 4c.
Is a PHY chip 23d. On the contrary, each unit that acts on the information signal from the power line communication router 1 and the like is referred to as a pulse transformer 22e and a PHY chip 23e.

For example, from the terminal 4a, "99: 99: 9x: 9y: 9
It is assumed that the IP packet with the destination MAC address "9: z0" is transmitted. The information signal of the IP packet is superimposed on the power carrier by the UPS 3 with a power line communication function (not shown) and transmitted to the outlet 2 with a LAN switch function.

The port power line communication module 21a of the outlet 2 having the LAN switch function separates and demodulates the information signal from the superimposed wave. The separated information signal (IP packet) is shaped by the PHY chip 23d for transmission distortion,
It is transported to the MAC chip 24.

A MAC address table, an example of which is shown in FIG. 10, is read from the MAC chip 24. The MAC address table describes the correspondence between the MAC address of the terminal 4 and the port number of the port to which the terminal 4 is connected.

The destination MAC address of the IP packet is MA
If it is listed in the C address table, the MAC
Recognize the port number to which the address should be sent. Here, it is assumed that the destination MAC address of the received IP packet is that of the terminal 4b connected to the port number "2". In this case, the IP packet is transmitted to the port power line communication module 21b connected to the port number "2". Power line communication module for port 21
b superimposes the received IP packet on the power carrier and transmits it to the terminal 4b.

It is also assumed that, for example, the terminal 4c sends out an IP packet having a destination MAC address of "99: 99: 9x: 9y: 98: z9". The information signal of the IP packet is superimposed on the power carrier by the UPS 3 with a power line communication function (not shown) and transmitted to the outlet 2 with a LAN switch function.

Similarly to the above, the power line communication module 21c for the port of the outlet 2 with the LAN switch function is
An information signal is separated from the superimposed wave and demodulated. The separated information signal (IP packet) has its transmission distortion shaped by the PHY chip 23d and is carried to the MAC chip 24.

The MAC address table shown in FIG. 10 is read from the MAC chip 24. This MAC
As described above, the address table is created when the IP address is given and stored in the memory 28.
The destination MAC address "99: 99: 9x: 9y: 98: z9" is
It is not listed in the read MAC address table. In this case, the IP packet is transmitted to the power line communication module 25 via the PHY chip 23e and the pulse transformer 22e in order to be transmitted to another outlet 2 with a LAN switch function or the power line communication router 1. The power line communication module 25 superimposes the received IP packet on the power carrier and transmits it to another outlet 2 with a LAN switch function or the power line communication router 1.

C) Network Status Display Function Here, the network status display function will be described with reference to FIG.

In FIG. 11, the power line communication router 1 is connected with a network system administrator operating terminal 8. FIG. 12 shows a functional block diagram of the network system administrator operation terminal 8. In this figure, 81 is a communication interface. Reference numeral 82 is a network information acquisition unit. 83 is an output unit.

When the network status display button displayed on the screen of the network system administrator operating terminal 8 is clicked, the network information acquisition unit 82 causes the power line communication router 1 to which the network system administrator operating terminal 8 is connected. To get the address table. In the address table, as described above, I
The P address and the MAC address are described in association with the unique address of the outlet 2 with a LAN switch function.

Network system administrator operating terminal 8
Obtains the address table for each LAN
The IP address range given to the outlet 2 with a switch function and the MAC address of the terminal 4 connected to each outlet 2 with a LAN switch function are recognized.

The network information acquisition section 82 refers to the acquired address table and recognizes the IP address of each terminal 4. Next, using the recognized IP address, it is confirmed whether or not each terminal 4 is in a communicable state by, for example, a "ping" command that can inspect the connection to the computer. Next, the computer name of the terminal 4 is acquired by executing the command for acquiring the computer name for the terminal 4 whose connection has been confirmed. In this way, the IP address of the terminal 4 and the terminal information such as the computer name of the terminal 4 are acquired.

The output unit 83 uses the address table and the terminal information, the IP address of each terminal 4, the computer name of each terminal 4, the range of the IP address of each outlet 2 with LAN switch function, the network of the power line communication router 1. The network status of the network constituted by the power line communication router 1 connected to the network system administrator operation terminal 8 such as an address is recognized.

Next, the output unit 83 uses a predetermined format or the like, as shown in the “output screen” of FIG. 11, as an example, the IP address of each terminal 4, the computer name of each terminal 4 ( In Figure 11, "Watanabe",
"Takagi", etc.), the IP address range of each outlet 2 with LAN switch function, the network address of the power line communication router 1 and the like are output to the output device of the system administrator terminal 4. The computer name here is W
A computer name for identifying each computer in a network connecting information terminals installed with Windows (registered trademark).

In the above embodiment, in order to acquire the terminal information, the address table is first acquired and then the computer name of each terminal is acquired. However, the present invention is not limited to this. For example, the network address of the power line communication router 1 is "999.999.999". Execute a command (“ping” etc.) that requests a response to all IP addresses of this network address, that is, the IP address “999.999.999.0 to 999.999.999.999”, and set the IP address that responded to the command. Alternatively, the terminal information may be acquired by executing a command that acquires the computer name.

The memory 28 is a non-volatile memory such as a hard disk device, a magneto-optical disk device, a flash memory, a read-only storage medium such as a CR-ROM, or a volatile memory such as a RAM (Random Access Memory). The original memory composed of sex memory, or a combination of these.

Each section in FIG. 12 may be realized by dedicated hardware, and each section is composed of a memory and a CPU (central processing unit) to realize the function of each section. The function may be realized by loading the program into the memory and executing it.

Further, a program for realizing the functions of the respective parts in FIG. 12 is recorded in a computer-readable recording medium, and the program recorded in this recording medium is read by the computer system and executed. May be. The “computer system” mentioned here includes an OS and hardware such as peripheral devices. Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and includes a design and the like within a range not departing from the gist of the present invention.

[0085]

As described above, the LA according to the present invention
According to the outlet with N-switch function and the network setting method, the following effects can be obtained.・
Since communication can be performed only with the power line, it is not necessary to wire the communication line. Therefore, the communication construction cost and the communication line fee can be deleted, and the cost of LAN switch articles and the like can be reduced, so that the infrastructure construction cost can be reduced. -Since the IP address can be assigned automatically, the system administrator's time and effort for network setting is reduced and the load is lightened.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a configuration of a power line communication router 1 in the same embodiment.

FIG. 3 is a diagram showing a configuration of an outlet with a LAN switch function in the same embodiment.

FIG. 4 is a diagram illustrating a U with a power line communication function in the embodiment.
It is a figure which shows the structure of PS3.

FIG. 5 is a diagram showing a configuration of a power line communication device 6 in the same embodiment.

FIG. 6 is a system configuration diagram of an operation of automatically setting a network in the same embodiment.

FIG. 7 is a diagram illustrating an operation of automatically setting a network in the same embodiment.

FIG. 8 is a diagram illustrating an operation of automatically setting a network in the embodiment.

FIG. 9 is a diagram illustrating a routing function of the power line communication router 1 in the same embodiment.

FIG. 10 is a diagram illustrating a switching function of the outlet 2 with a LAN switch function in the same embodiment.

FIG. 11 is a diagram illustrating a network status display function in the same embodiment.

FIG. 12 is a diagram showing a configuration of a network system administrator operating terminal 8 in the same embodiment.

[Explanation of symbols]

1: Power line communication router, 11: Power line communication module,
12: interface card, 13: memory, 14:
Flash memory, 15: CPU, 16: power supply unit, 2:
Outlet with LAN switch function, 21: Power line communication module for port, 22: Pulse transformer,
23: PHY chip, 24: MAC chip, 25: power line communication module, 26: power supply unit, 27: CPU, 2
8: Memory, 3: UPS with power line communication function, 31: Power line communication module, 32: Input transformation unit, 33: Rectification unit, 34: Smoothing unit, 35: Storage battery, 36: Non-interruption changeover switch, 361: SW- A, 362: SW-B, 36
3: SW-C, 37: Inverter unit, 38: Output transformer unit, 4: Terminal, 5: Network, 6: Power line communication device, 61: Modulation / demodulation circuit, 7: Commercial power, 8: Terminal for system administrator, 81 : Communication interface, 82: network information acquisition unit, 83: output unit

Claims (3)

[Claims] 1. An outlet with a LAN switch function for relaying between a plurality of terminals and information equipment connected by a power line carrying a superposed wave in which an information signal is superposed on an electric power carrier, and separating the information signal from the superposed wave. In addition, a demultiplexing / superimposing unit that superimposes an information signal on a power carrier, a storage unit that stores a MAC address table that describes the correspondence relationship between the MAC address of each terminal and the port to which the terminal is connected, When an IP packet including a destination MAC address is received via the separating / superimposing means, the port connected to the terminal which is the destination of the IP packet is recognized from the MAC address table and the destination MAC address of the IP packet. Switching means for transmitting the IP packet through the recognized port and the separating / superimposing means And an outlet with a LAN switch function. 2. An IP address requesting means for transmitting information on the number of IP addresses to be issued to the information device via the separating / superimposing means, and a separation / superimposing of a plurality of IP addresses issued by the information equipment. I for receiving via the means and transmitting the received IP address to the terminal via the separating / superimposing means I
The LA according to claim 1, further comprising: a P address assigning unit.
Outlet with N switch function. 3. A switching method carried out by an outlet having a LAN switch function, which relays between a plurality of terminals connected by a power line carrying a superposed wave in which an information signal is superposed on a power carrier and a power line communication router, wherein: A process of storing a MAC address table in which the correspondence between the MAC address of the terminal and the port to which the terminal is connected is stored, and an information signal is separated from the superimposed wave from the terminal and included in the separated information signal. IP packet to be transmitted to the destination MA
When the IP packet including the C address is received, the MA
From the C address table and the destination MAC address of the IP packet, the port connected to the terminal that is the destination of the IP packet is recognized, and the information signal including the IP packet is transmitted as a power carrier through the recognized port. A switching method comprising: