JP2007158900A - Customer premise network system, adapter for ip telephony which is used for the system, linking unit and terminal modem - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a customer premise network system in which a telephone line is utilized as a common cable for transmission and power supply, wiring cost of transmission and power supply can be reduced, and customer premise transmission whose transmission rate is higher and stable is possible. <P>SOLUTION: The customer premise network system 1 is constituted of the telephone lines 4, a linking unit 6 and an adapter 5 for IP telephony. The telephone lines 4 are installed by branching into each part stores 3a-3d in a home to which stores telephone call signals are transmitted. In the linking unit 6, mutual conversion between an external signal of an external network and a predetermined customer premise network signal is enabled, and connection to the telephone line 4 is performed in order to superimpose the customer premise network signal on the telephone line 4. In the adapter 5, mutual conversion between signal component for IP telephony contained in the customer premise network signal and a telephone call signal is enabled, the telephone call signal is returned and superimposed on the telephone line 4, and connection to the telephone line 4 is performed in order to supply power source via the telephone line 4 to both a telephone device 8 and the linking unit 6 which are connected to the telephone line 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a home network system that uses a telephone line for transmitting a call signal as a shared cable, and an IP telephone adapter, a connection unit, and a terminal modem device used in this system.

  Currently, there are connection systems such as ISDN (Integrated Services Digital Network), ADSL (Asymmetric Digital Subscriber Line), and FTTH (Fiber To The Home) using an optical fiber, among them, among which FTTH is a communication speed. However, it is spreading year by year because of its high speed and high communication stability. With the spread of FTTH and the rise of digital home appliances, in-home network systems aimed at high-speed communication between devices in the home are attracting attention.

According to this, each home appliance and personal computer are placed on the same network so that each device can be used in cooperation, or a home gateway is installed and connected to the Internet to control the home appliance from the outside. (See Patent Document 1).
On the other hand, IP telephones have become widespread in recent years. The main realization method is to install a terminal adapter (TA) for an IP telephone that can communicate with an external network in the house and connect a telephone to the adapter via an existing telephone line.

JP 2001-338213 A

As one of means for constructing the in-home network system, power line communication (PLC) using an existing power line wired in each room in the home as a common communication medium is known. This power line communication has the advantage that there are many connection points and a high degree of freedom in selecting the location where the terminal device is used, but on the other hand, the complexity of the wiring route affects the transmission characteristics and tends to cause variations in the transmission speed. .
In view of this, it is conceivable to construct a home communication network capable of high-speed and stable home communication by using a telephone line having better transmission characteristics than a power line as a common communication medium in the home.

  However, the telephone line also has a function as a power cable for supplying power to the telephone, but unlike the power line, it is not a general-purpose power cable for supplying power to various electric devices other than the telephone. . For this reason, even if the telephone line is used as a common communication medium in the house, it is used as a terminal unit for a local terminal such as a connection unit that is a subscriber termination device that communicates with an external network or a personal computer or a home appliance other than a telephone. Requires a unique power source that is driven by power supply from the power line.

Therefore, even if the telephone line is used as a common communication medium in the house, the connection unit and the terminal modem device need to be connected not only to the telephone connection terminal but also to the power outlet. If the power supply wiring is also taken into consideration, the wiring cannot be simplified so much.
In addition, in the FTTH, when the subscriber does not like the outer wall construction for drawing the optical fiber into the house, it is necessary to install the connection unit on the outer wall outside the house or under the eaves. If there is no power outlet, it will be necessary to construct a new power source, which will increase the construction cost.

  In view of such a situation, the present invention makes it possible to use a telephone line with good transmission characteristics as a common cable for communication and power supply, thereby reducing the wiring cost of communication and power supply, and at a higher transmission speed. An object is to provide a home network system capable of stable home communication.

In order to achieve the above object, the present invention takes the following technical means.
That is, the in-home network system of the present invention uses a telephone line installed in each room in the home to transmit a call signal and an external signal transmitted through a cable leading to the external network to a predetermined home network. It is mutually convertible into a home network signal based on the system, and is included in the home network signal superimposed on the telephone line and the connection unit connected to the telephone line to superimpose the home network signal on the telephone line Signal components for an IP phone can be converted into a call signal, the call signal is returned to the telephone line and superimposed, and the telephone line is connected to both the telephone connected to the telephone line and the connection unit. And an IP telephone adapter connected to the telephone line to supply power through the telephone line.

According to the home network system of the present invention, the connection unit converts the external signal transmitted to the cable leading to the external network into a predetermined home network signal and superimposes it on the telephone line. The existing telephone line can be used as it is as a common cable for communication for configuring the network.
For this reason, a home communication network can be easily and economically constructed without newly laying a communication cable, and the wiring cost of communication can be reduced. In addition, since the telephone line has better transmission characteristics than the power line, it is possible to perform stable home communication with a higher transmission speed.

Further, according to the home network system of the present invention, in the IP telephone adapter, the IP telephone signal components included in the home network signal are mutually converted into a call signal, and the call signal is returned to the telephone line and superimposed. As a result, the use of one or more telephones connected to the telephone line is ensured, and power is supplied to both the telephone connected to the telephone line and the connection unit through the telephone line. Therefore, the existing telephone line can be used as it is as a shared cable for power supply to the connection unit.
For this reason, it can be driven only by connecting the connection unit to the telephone line, and the connection to the power outlet becomes unnecessary, so that the wiring cost of the power supply can be reduced.

In particular, when the connection unit is installed outside the home, the connection unit can be driven without a power outlet outside the building, so no work is required to secure a new power supply for the connection unit installed outdoors. Thus, there is an advantage that the system introduction cost for new subscribers can be reduced.
In the home network system of the present invention, a terminal modem device that can mutually convert signal components for local terminals other than the telephone contained in the home network signal superimposed on the telephone line into local signals can be further connected to the telephone line. In this case, a local terminal such as a personal computer or a home appliance can communicate with the external network via the terminal modem device.

When such a terminal modem device is provided, if an adapter that can supply power to the terminal modem device through the telephone line is adopted as the IP telephone adapter, not only the telephone and the connection unit but also the terminal modem device The existing telephone line can be used as it is as a shared cable for power supply.
For this reason, it is possible to drive the terminal modem device only by connecting it to the telephone line, and it is not necessary to connect to the power outlet, so that the wiring cost of the power source can be reduced.

  By the way, since the polarity of the power supply voltage is usually reversed (inverted) in the telephone in order to detect the incoming call of the incoming terminal, the incoming call is required to make the IP telephone adapter function as the power supply for the telephone. Sometimes it is necessary to provide the IP telephone adapter with a polarity switching section for reversing the power supply voltage. However, since the present invention allows the IP telephone adapter to function as a power source for the connection unit and the terminal modem device, when a voltage whose polarity is reversed when the telephone is called is applied to the connection unit or the terminal modem device as it is. Inconveniently, these cannot be driven properly.

  Therefore, it is desirable to provide a polarity unifying unit that unifies the power supply voltage to the same polarity as that in the normal state even in the case of switching the polarity due to an incoming call, in the connection unit or terminal modem device supplied with power from the IP telephone adapter via the telephone line. . In this case, even an IP telephone adapter that switches the polarity for polarity switching can appropriately drive modem equipment (connection unit and terminal modem device) that does not require polarity switching. The adapter can function effectively as a comprehensive power source.

The IP telephone adapter of the present invention includes a terminal connection unit to which a local terminal cable other than a telephone is connected, and a signal component for a local terminal other than the telephone included in a home network signal superimposed on the telephone line. It is also possible to adopt a device provided with a local signal conversion unit capable of mutually converting into a local signal.
In this case, the local terminal can be communicated with an external network by connecting a local terminal such as a personal computer or home appliance with a local terminal cable connected to the terminal connection unit, and the IP telephone adapter. Can also have the function as a terminal modem device.

  As described above, according to the present invention, a telephone line with good transmission characteristics is used as a common cable for communication and power supply, so that the wiring cost for communication and power supply can be reduced, and the transmission speed is higher and stable in the home. Communication is possible.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows the overall configuration of a home network system 1 according to an embodiment of the present invention, and FIG. 2 shows a connection unit 6 used in the system 1. 3 shows an IP telephone adapter 5 used in the system 1, and FIG. 4 shows a terminal modem device 7 used in the system 1.
As shown in FIG. 1, the network system 1 according to the present embodiment uses an optical fiber 2 that is a communication cable leading to an external network, and provides FTTH (Fiber To The Home) that provides integrated services such as an IP phone and the Internet. ), And the optical fiber 2 is drawn into the site of the user's house 3. That is, the network system 1 is constructed in a subscriber home 3 that is a terminal side of a passive optical network (PON) that is an optical subscriber communication system.

The in-home network system 1 of the present embodiment uses an existing telephone line 4 for transmitting an analog call signal as a transmission path for various electrical signals obtained by converting an optical signal transmitted to the optical fiber 2, and It is shared as a power supply current carrying path to the connection unit 6 and the terminal modem device 7, and this existing telephone line 4 is branched and wired in advance into a plurality of rooms 3a to 3d in the subscriber house 3. .
The connection unit 6 that functions as a subscriber-side terminating device is installed outside the subscriber's house 3 (outer wall or eaves, etc.), and the optical fiber 2 is connected to the connection unit 6. In the subscriber's home 3, the existing telephone line 4 communicating from the inside of the home to the outside of the home is connected.

Among the plurality of rooms 3a to 3d in the house, an IP telephone adapter 5 having a comprehensive power supply function for the telephone 8 and the modem devices (connection unit 6 and terminal modem device 7) is installed in one room 3a. Has been. In the other rooms 3b to 3d, a terminal modem device 7 and a telephone 8 are installed, and these are also connected to the telephone line 4, respectively.
As shown in FIG. 2, the connection unit 6 of the present embodiment includes an internet communication system modulation / demodulation unit 11, a home network communication system modulation / demodulation unit 12, a power supply unit 13, And a control unit (CPU) 14 that integrally controls each unit.

The optical fiber 2 is connected to the internet communication system modem 11 of the connection unit 6. The modulation / demodulation unit 11 includes, for example, an ONU (Optical Network Unit) and a media converter (MC), and is a device that mutually converts optical signals transmitted to the optical fiber 2 into digital electrical signals.
The internet communication system modulation / demodulation unit 11 is directly connected to the home network communication system modulation / demodulation unit 12, and the modulation / demodulation unit 12 converts the digital electrical signal modulated / demodulated by the internet communication system modulation / demodulation unit 11 into a predetermined home network communication. It consists of a modem that modulates and demodulates a high-frequency home network signal (several MHz to several tens of MHz) based on a system (for example, OFDM system).

Therefore, in the connection unit 6 of this embodiment, each of the modems 11 and 12 receives an optical signal that is an external signal including a signal component for IP telephone and a signal component for terminal equipment other than the telephone 8 such as the personal computer 54. A function as a network signal conversion unit is provided which is converted into a home network signal as it is without being separated into each signal component and superimposed on the telephone line 4.
A telephone line connection unit 15 to which the existing telephone line 4 is connected is provided on the outer wall portion of the housing 10 of the connection unit 6. The connection unit 15 includes a home network communication system modulation / demodulation unit 12, a power supply unit 13, and the like. Are connected in parallel.
The connection unit 6 of this embodiment is a filter built-in type. That is, a low-pass filter 16 is interposed between the power supply unit 13 and the telephone line connection unit 15, and a high-pass filter 17 is interposed between the home network communication system modulation / demodulation unit 12 and the connection unit 15.

As shown in FIG. 6A, the low-pass filter 16 allows signals in the telephone use band (300 Hz to 4 KHz) to pass, but passes signals in the use band (several MHz to several tens of MHz) of the home network communication system. This prevents the noise in the band used in the home network communication system from being propagated to the power supply unit 13. As the low-pass filter 16, for example, a circuit configuration (not shown) in which connection portions of a plurality of coils connected in series to each signal line of the telephone line 4 are connected in parallel with a capacitor can be adopted.
Since the low pass filter 16 of the connection unit 6 is for removing noise to the power supply unit 13, in order to remove high frequency components generated at the time of inversion when dialing or transmitting dial pulses, As shown by a broken line in FIG. 6A, it is preferable to use a device that does not pass a signal in the telephone use band (300 Hz to 4 KHz). In this case, however, it is necessary to allow the disadvantage that the capacity and size of the filter 16 are increased.

  Further, as shown in FIG. 6B, the high-pass filter 17 allows a signal in the use band (several MHz to several tens of MHz) of the home network communication system to pass, but a signal in the telephone use band (4 KHz or less) It consists of a filter that does not pass. As the high-pass filter 17, for example, a circuit configuration (not shown) in which a plurality of capacitor connection portions connected in series to each signal line of the telephone line 4 are connected in parallel by a coil can be employed. Instead of the high-pass filter 17, a band-pass filter that passes only the signal in the band used for the home network communication method as shown in FIG. 6C may be employed.

As illustrated in FIG. 2, the power supply unit 13 of the connection unit 6 includes a polarity unifying unit 19, a smoothing circuit 20, and a voltage stabilization circuit 21. Among these, the polarity unifying unit 19 unifies the power supply voltage to the same polarity as that in the normal state even when the polarity switching unit 38 (described later) provided in the IP telephone adapter 5 is switched at the time of an incoming call. For example, it is constituted by a diode bridge.
Further, the smoothing circuit 20 is composed of a capacitor circuit having a capacity capable of maintaining the output voltage even in the event of momentary interruption at the time of reversal of polarity, and the stabilizing circuit 21 is provided between the AC / DC converter and the DC / AC converter. It is comprised by interposing a transformer. This stabilization circuit 21 steps down the voltage of 48V supplied to the telephone line 4 to, for example, 3.3V or 1.8V for IC and supplies power to each part in the connection unit 6.

  As shown in FIG. 3, the IP telephone adapter 5 of this embodiment includes a home network communication system modulation / demodulation unit 24 and an Ethernet modulation / demodulation unit (“Ethernet” is a registered trademark; the same applies hereinafter) in one housing 23. 25, an IP telephone signal conversion unit 26, a switch 27, and a control unit (CPU) 28 that controls these in an integrated manner. Further, on the outer wall portion of the housing 23, a telephone line connecting portion 29 to which the telephone line 4 is connected and a cable for a local terminal such as a personal computer 54 or a home appliance 55 (Ethernet cable: not shown in the present embodiment). Is connected to the terminal.

The telephone line connection unit 29 is connected in parallel with the home network communication system combination modulation / demodulation unit 24 and the IP telephone signal conversion unit 26, and these are connected to the Ethernet modulation / demodulation unit 25 via the switch 27.
The home network communication system modulation / demodulation unit 24 modulates / demodulates a high-frequency home network signal (several MHz to several tens of MHz) transmitted from the telephone line 4 into a digital electrical signal by a predetermined home network communication system (for example, OFDM system). It consists of a modem. Based on the MAC address or IP address of the digital electrical signal (packet signal) demodulated by the home network communication system modulation / demodulation unit 24, the switch 27 converts the signal to either the Ethernet modulation / demodulation unit 25 or the IP telephone signal conversion unit 26. Has a switching function.

The Ethernet modulation / demodulation unit 25 includes a modem that modulates / demodulates the digital electric signal distributed by the switch 27 into an Ethernet signal which is a local signal for controlling the personal computer 54 and the home appliance 55. The IP telephone signal conversion unit 26 is composed of a modem that modulates / demodulates the digital electrical signal distributed by the switch 27 into a speech signal (4 KHz or less) that is an analog voice signal in the speech band, for example, a VoIP terminal adapter. .
Since this IP telephone signal conversion unit 26 is connected to a telephone line connection unit 29 via a low-pass filter 32 to be described later, the call signal distributed by the switch 27 and modulated by the conversion unit 26 is converted to the telephone line 4. It is superimposed on the back.

In the IP telephone adapter 5 of the present embodiment, in addition to the telephone line connection part 29 and the terminal connection part 30, a telephone connection part 31 for directly connecting an IP telephone is provided. Among these, the telephone line connection unit 29 is connected to the home network communication system modulation / demodulation unit 24 and the IP telephone signal conversion unit 26 in parallel, and the telephone connection unit 31 is connected only to the IP telephone signal conversion unit 26. .
In addition, the telephone line connection portion 29 is provided with an overcurrent prevention member 34 made of a fuse or the like in order to prevent an overcurrent caused by a short circuit caused by a failure of the connection unit 6 installed outdoors or intrusion of rainwater. The upper limit value of the overcurrent may be set, for example, as the sum of the maximum current consumption of the connection unit 6 and / or the terminal modem device 7 fed by the general power supply unit 35 described later and the maximum current consumption of the telephone 8.

The IP telephone adapter 5 of this embodiment is also a filter built-in type. That is, a low pass filter 32 is interposed between the IP telephone signal conversion unit 26 and the telephone line connection unit 29, and a high pass filter 33 is interposed between the home network communication system modulation / demodulation unit 24 and the connection unit 29. Yes.
As shown in FIG. 6A, the low-pass filter 32 allows signals in the telephone use band (300 Hz to 4 KHz) to pass, but passes signals in the use band (several MHz to several tens of MHz) of the home network communication system. This prevents the high-frequency noise generated when the telephone is used or when a dial pulse is transmitted from being transmitted to the telephone line 4. As the low-pass filter 32, for example, a circuit configuration (not shown) in which connection portions of a plurality of coils connected in series to each signal line of the telephone line 4 are connected in parallel by a capacitor can be adopted.

Further, as shown in FIG. 6B, the high-pass filter 33 allows a signal in the use band (several MHz to several tens of MHz) of the home network communication system to pass, but does not pass a signal in the telephone use band (4 KHz or less). It consists of a filter that does not pass. As the high-pass filter 33, for example, a circuit configuration (not shown) in which connection portions of a plurality of capacitors connected in series to each signal line of the telephone line 4 are connected in parallel by a coil can be adopted.
Instead of the high-pass filter 33, a band-pass filter that allows only a signal in the use band of the home network communication system to pass as shown in FIG.

The IP telephone signal conversion unit 26 of the IP telephone adapter 5 is provided with a total power supply unit 35 that supplies power through the telephone line 4 to the telephone 8, the connection unit 6, and the terminal modem device 7. FIG. 5 is a circuit block diagram of the general power feeding unit 35.
This general power supply unit 35 is connected to an outlet 42 (see FIG. 1) provided in the room 3a, and generates a driving voltage for a telephone by receiving a household AC voltage, and generates a voice DC voltage. A first power feeding unit 36 for generating, a second power feeding unit 37 for generating an alternating voltage for ringing, a polarity switching unit 38 for inverting (inverting) the polarity of the power supply voltage for voice when a call is received, and a second power feeding unit 37, a relay switch 39 for turning on and off 37, and a control circuit 40 for switching and controlling the polarity switching unit 38 and the relay switch 39.

As shown in FIG. 5, the control circuit 40 connects the contact 1 and the contact 3 and the contact 2 and the contact 4 of the polarity switching unit 38 at the time of on-hook or off-hook, and connects the switching unit 38 at the time of an incoming call. Contact point 1 and contact point 4 and contact point 2 and contact point 3 are connected to each other, the polarity of the power supply voltage to the voice circuit 41 that transmits the voice signal to the telephone line 4 is reversed (inverted), and the telephone 8 is notified of the incoming call It is.
In addition, the control circuit 40 connects the contact A and the contact C of the relay switch 39 at the time of on-hook or off-hook, and connects the contact B and the contact C of the switch 39 to generate a ringing signal at the time of an incoming call. Is.

As shown in FIG. 4, the terminal modem device 7 according to the present embodiment includes a home network communication system modulation / demodulation unit 45, an Ethernet modulation / demodulation unit 46, a power supply unit 47, and each of these units in one housing 44. And a control unit (CPU) 48 for controlling the above in an integrated manner.
As in the case of the connection unit 6, the home network communication system modulation / demodulation unit 46 converts the high-frequency (several MHz to several tens of MHz) home network signal transmitted to the telephone line 4 into a predetermined home network communication system (for example, OFDM And is connected to a telephone line connection unit 49 provided in the housing 44. The Ethernet modulation / demodulation unit 46 includes a modem that modulates / demodulates the digital electrical signal processed by the home network communication system modulation / demodulation unit 13 into an Ethernet signal, and is connected to the terminal connection unit 50 to which an Ethernet cable provided in the housing 44 can be connected. Has been.

The terminal modem device 7 of this embodiment is also a filter built-in type. That is, a low-pass filter 51 is interposed between the power supply unit 47 and the telephone line connection unit 49, and a high-pass filter 52 is interposed between the home network communication system modulation / demodulation unit 45 and the connection unit 49.
The filters 51 and 52 of the terminal modem device 7 are the same as the filters 16 and 17 of the connection unit 6. Further, the same power supply unit 47 of the terminal modem device 7 as the power supply unit 13 of the connection unit 6 is employed. Therefore, the same reference numerals as those in FIG. 2 are assigned to the components (the polarity unifying unit 19, the smoothing circuit 20, and the voltage stabilizing circuit 21) of the power supply unit 47 in FIG.

Returning to FIG. 1, in the home network system 1 of the present embodiment, the connection unit 6 itself does not have a terminal adapter function for IP telephones and an Ethernet conversion function, and all signal components contained in the optical fiber 2 are in a predetermined home network. It is sufficient that only the telephone line 4 is connected to the inside of the connection unit 6 on the inside of the connection unit 6 after being converted into signals and superimposed on the telephone line 4.
For this reason, the connection unit 6 is arranged outside the subscriber's house 3 (for example, the outer wall or under the eaves), and the telephone line 4 exposed to the outside from the house is connected to the connection unit 6. Therefore, according to the home network system 1 of the present embodiment, a complicated work of forming a hole for drawing the light fiber 2 into the wall of the subscriber home 3 is unnecessary, and the contractor enters the home and works. There is no need to do.

As shown in FIG. 1, an IP telephone adapter 5 is installed in one of the rooms 3 a to 3 d of the subscriber house 3. In the home network system 1 of this embodiment, the adapter 5 has both a terminal adapter function for IP telephone (IP telephone signal conversion unit 26) and an Ethernet conversion function. And the telephone 8 are connected.
On the other hand, the terminal modem device 7 and the telephone 8 are installed in the rooms 3b to 3d other than the installation room 3a of the IP telephone adapter 5, and the terminal modem device 7 can communicate with the personal computer 54 or the Internet. A home appliance 55 is connected. As shown in the room 3c in FIG. 1, the telephone 8 can be connected to the telephone line 4 through a low-pass filter 56 having a pass characteristic shown in FIG.

In the in-home network system 1 of the present embodiment (FIGS. 1 to 4) according to the above configuration, the optical signal (downstream signal) from the optical fiber 2 that is a cable leading to the external network is connected to the connection unit 6 installed outside the home. In the Internet communication system modulation / demodulation unit 11 (ONU or the like), O / E conversion is performed to form a digital electric signal. The digital electric signal is converted into a home network signal as it is without being separated into different signal components by the home network communication system modulation / demodulation unit 12 and transmitted to the home telephone line 4.
In the case of an upstream signal, the home network signal is E / O converted by tracing back the modems 11 and 12 and transmitted to the optical fiber 2.

  The in-home network signal transmitted to the telephone line 4 is demodulated into a digital electric signal by the in-home network communication system modulation / demodulation unit 24 in the IP telephone adapter 5 through the telephone line 4, and the signal is distributed by the switch 27 and the adapter. 5 is converted into an Ethernet signal and a call signal by an Ethernet modem 25 and an IP telephone signal converter 26, respectively. Among these, the Ethernet signal is converted into a home network signal by tracing back the modems 25 and 24 in the case of an uplink signal, and transmitted to the telephone line 4.

  On the other hand, the call signal is transmitted by returning the telephone line 4 on which the home network signal is transmitted to the telephone line 4 so as to be superimposed on the telephone line 8 installed in the other rooms 3b to 3d. Communication is secured. As described above, the IP telephone adapter 5 according to the present embodiment includes a telephone signal conversion function (TA function) that mutually converts signal components for IP telephone included in a home network signal into a call signal, and the call signal as a telephone. It has a function of returning to the line 4 and superimposing it.

  On the terminal modem device 7 side installed in the rooms 3b and 3d, the home network signal received from the telephone line 4 is demodulated into a digital electrical signal by the home network communication system modulation / demodulation unit 45. It is converted into a signal and transmitted to a local terminal such as a personal computer 54 or a home appliance 55. In the case of an upstream signal, the Ethernet signal is converted into a home network signal by tracing back the modems 46 and 46 and transmitted to the telephone line 4. The telephone 8 installed in the room 3c transmits and receives analog communication signals as they are using the telephone line 4 as a transmission medium.

  Thus, in the home network system 1 of this embodiment (FIGS. 1 to 4), the connection unit 6 converts the external signal transmitted to the cable (optical fiber 2) leading to the external network into a predetermined home network signal. Thus, since the telephone line 4 is superimposed, the existing telephone line 4 can be used as it is as a cable for configuring the home network system 1. For this reason, a home communication network can be easily and economically constructed without newly laying a cable, and the wiring cost can be reduced. In addition, since the telephone line 4 has better transmission characteristics than the power line, it is possible to perform home communication with a higher transmission speed and more stable.

  Further, according to the home network system of the present embodiment, the IP telephone adapter 5 mutually converts the IP telephone signal components included in the home network signal into a call signal, and returns the call signal to the telephone line 4. Thus, the use of one or a plurality of telephones 8 connected to the telephone line 4 is ensured. Further, the IP telephone adapter 5 is provided with a general power supply unit 35, and the power supply unit 35 allows not only the telephone 8 connected to the telephone line 4 but also the connection unit 6 and the terminal modem device 7 through the telephone line 4. Since power is supplied, the existing telephone line 4 can be used as it is as a shared cable for power supply to each modem device other than the telephone.

  For this reason, the connection unit 6 and the terminal modem device 7 can be driven simply by connecting to the telephone line 4, and connection to a power outlet is not required, so that the power supply wiring cost can be reduced. In particular, in this embodiment, since the connection unit 6 is installed outside the house, the connection unit 6 can be driven without a power outlet outdoors. For this reason, it is not necessary to construct a new power supply for the connection unit 6 arranged outdoors, and this has the advantage that the system introduction cost for a new subscriber can be reduced.

  In the home network system 1 according to the present embodiment, the IP telephone signal conversion unit 14 and the telephone 8 are connected to the telephone line 4 through the low-pass filters 32 and 56 so that the telephone call signal passes through the telephone line 4. However, noise in the use band of the home network signal is not allowed to pass through, so that high frequency components at the time of occurrence of inversion or dial pulse, which are noise generated on the telephone 8 side, are not transmitted to the telephone line 4. For this reason, the communication quality of home network communication improves. In particular, when a video streaming service is provided, the video is not disturbed by noise on the telephone 8 side, and the quality of the service is improved.

  In particular, when the dial pulse is generated, the telephone 8 has a low impedance, so that most of the home network signal flows to the telephone 8 side, so that the signal that can be received by the terminal modem device 7 is greatly attenuated and communicates only at low speed. It may become impossible or communication may not be possible. In this regard, in the present embodiment, since the low-pass filters 32 and 56 described above are provided, the use band of the home network signal is blocked from the call signal (becomes a high impedance), thereby deteriorating the communication state. Can be prevented in advance.

  Further, by connecting the home network communication system modulation / demodulation units 12, 24, 45 to the telephone line 4 through the high-pass filters 17, 33, 52, the home network signal is passed through the telephone line 4, but the use of the call signal is used. Since noise corresponding to the band is not allowed to pass through, low frequency components, which are noise on the home network communication side, are not transmitted to the telephone line 4, and thus the voice quality of the telephone is improved.

The above embodiment is illustrative and not restrictive. The scope of right of the present invention is defined by the claims, and all modifications within the scope equivalent to the configurations described therein are also included in the scope of the present invention.
For example, in the above embodiment, the terminal modem device 7 is provided in the rooms 3b and 3d. However, a network without the device 7 may be configured, and only the telephone 8 may be connected.
Further, as a subscriber communication system for communicating with the external network, not only FTTH (Fiber To The Home) using the optical fiber 2 but also ADSL (Asymmetric Digital Subscriber Line) may be adopted.

1 is an overall configuration diagram of a home network system according to an embodiment of the present invention. It is a functional block diagram of the connection unit used for the said system. It is a functional block diagram of the adapter for IP telephones used for the said system. It is a functional block diagram of the terminal modem apparatus used for the said system. It is a circuit block diagram of the total electric power feeding part of the adapter for IP telephones. (A) is a graph showing the pass characteristic of the low pass filter, (b) is a graph showing the pass characteristic of the high pass filter, and (c) is a graph showing the pass characteristic of the band pass filter.

Explanation of symbols

1 Home network system 2 Optical fiber (cable)
3 subscriber's house (house)
3a room 3b room 3c room 3d room 4 telephone line 5 adapter for IP telephone 6 connection unit 7 terminal modem device 8 telephone 11 Internet communication system modem (network signal converter)
12 Home network communication system modem (network signal converter)
13 Power Supply Unit 15 Telephone Line Connection Unit 26 IP Telephone Signal Conversion Unit 29 Telephone Line Connection Unit 24 Home Network Communication System Modulation / Demodulation Unit 25 Ethernet Modulation / Demodulation Unit (Local Signal Conversion Unit)
30 Terminal connection unit 35 Total power supply unit 46 Ethernet modulation / demodulation unit (local signal conversion unit)
47 Power supply unit 49 Telephone line connection unit 50 Terminal connection unit

Claims (11)

A telephone line that is branched and installed in each room in the house to transmit a call signal;
An external signal transmitted through a cable connected to an external network can be converted into a home network signal based on a predetermined home network system, and the home network signal is connected to the telephone line so as to be superimposed on the telephone line. A connection unit;
The IP telephone signal component included in the home network signal superimposed on the telephone line can be converted into a call signal, and the call signal is superimposed on the telephone line and connected to the telephone line. An IP telephone adapter connected to the telephone line to supply power to the telephone and the connection unit through the telephone line;
A home network system characterized by comprising: A terminal modem device capable of mutually converting a signal component for a local terminal other than the telephone contained in the home network signal superimposed on the telephone line into a local signal is further connected to the telephone line;
The home network system according to claim 1, wherein the IP telephone adapter can supply power to the terminal modem device through the telephone line. The IP phone adapter includes a polarity switching unit that reverses a power supply voltage when an incoming call is received,
The in-home network system according to claim 2, wherein the connection unit, the terminal modem device, or both of them include a polarity unifying unit that unifies the power supply voltage to the same polarity as that in the normal state even when the call is reversed. A telephone line connection to which a telephone line for transmitting a call signal is connected;
A telephone signal conversion unit capable of mutually converting signal components for IP telephone included in a home network signal superimposed on the telephone line into the call signal and superimposing the call signal back to the telephone line;
A connection unit capable of mutually converting an external signal transmitted through a cable leading to an external network into a home network signal and connected to the telephone line to superimpose the home network signal on the telephone line; and A general power supply unit capable of supplying power to the connected telephones through the telephone line;
An IP phone adapter for use in a home network system that uses a telephone line as a shared cable. A terminal connection part to which a cable for a local terminal other than a telephone is connected;
5. The IP telephone according to claim 4, further comprising: a local signal conversion unit capable of mutually converting a signal component for a local terminal other than the telephone included in the home network signal superimposed on the telephone line into a local signal. adapter. A terminal modem device capable of mutually converting a signal component for a local terminal other than the telephone contained in the home network signal superimposed on the telephone line into a local signal is further connected to the telephone line;
The IP telephone adapter according to claim 4 or 5, wherein the total power supply unit can supply power to the terminal modem device through the telephone line.   The IP telephone adapter according to any one of claims 4 to 6, wherein the general power supply unit includes a polarity switching unit that reverses a power supply voltage when an incoming call is received. A telephone line connection to which a telephone line for transmitting a call signal is connected;
A network signal converter capable of mutually converting an external signal transmitted to a cable leading to an external network into a home network signal and superimposing the home network signal on the telephone line;
A power supply unit that drives each unit by power supply from the telephone line;
A connection unit for use in a home network system that uses a telephone line as a shared cable.   The connection unit according to claim 8, wherein the power supply unit includes a polarity unifying unit that unifies the power supply voltage to the same polarity as that in a normal state even when the incoming call is reversed. A telephone line connection to which a telephone line for transmitting a call signal is connected;
A terminal connection part to which a cable for a local terminal other than a telephone is connected;
A local signal conversion unit capable of mutually converting a signal component for a local terminal other than a telephone included in a home network signal superimposed on the telephone line into a local signal;
A power supply unit that drives each unit by power supply from the telephone line;
A terminal modem device for use in a home network system that uses a telephone line as a shared cable.   The terminal modem device according to claim 10, wherein the power supply unit includes a polarity unifying unit that unifies the power supply voltage to have the same polarity as that in a normal state even when a call is reversed.

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