JPH1175229A - Stationary terminal equipment at side of telephone network subscriber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a loss in a high frequency signal sent/received as a radio signal and to facilitate the installation of the subscriber side stationary terminal in the telephone network system where subscriber channels are configured with radio channels. SOLUTION: An outdoor circuit section 64 is contained in an antenna protection case 60 to configure them integrally as an antenna unit 50. That is, a subscriber's unit 52 is made small and light by containing part of its functions to the antenna unit 50. A high frequency signal is converted into a base band signal at a radio section 80 of the outdoor circuit section 64 and the antenna unit 50 and the subscriber's unit 52 are connected by a 2-wire cable. Through the constitution above, the loss in the high frequency signal is suppressed and the limitation of the installed position of the subscriber's unit is relaxed together with the small sized and light weight configuration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone network in which a subscriber line is constructed by a radio line, such as a PHS wireless local loop system (hereinafter, referred to as a PHS-WLL system). The present invention relates to a fixed terminal device installed on the user side.

[0002]

2. Description of the Related Art At present, PHS (Personal Handyphone Sy
Simple mobile phone systems called stems) are rapidly expanding. In the PHS, small radio base stations are arranged at various points in a service area, and the area is divided into microcells having a radius of about 100 to several hundreds of meters. In each microcell, the subscriber uses a PHS terminal to communicate with a radio base station that is in charge of the microcell via a radio line, and the radio base station is connected to a communication partner by a public network such as an ISDN line.

[0003] In this PHS, since the area shared by each radio base station is a small area called a micro cell, the transmission power of the radio base station may be small, so that it can be downsized and the cost of equipment and construction can be reduced. Is achieved. Further, even if different microcells use the same frequency, problems such as interference hardly occur, so that there is an advantage that the number of users that can be accommodated in a predetermined frequency band can be increased.

[0004] The PHS-WLL system uses such a PH.
It is a telephone communication network newly proposed by applying the advantages of S. FIG. 5 is a schematic system configuration diagram of an example of the PHS-WLL system. The central office is connected to a carrier network 4. A WLL access controller 6 (hereinafter abbreviated as WAC) is connected to the central office 2 and a PCM (Pulse Code) transmitted at 64 kbps.
Modulation) signal is 32 kbps A in WAC6.
The signal is converted to a DPCM (Adaptive Differential PCM) signal, and the PHS is transmitted through an optical cable or wireless line 8.
Is transmitted to the WLL cell station 10 (hereinafter abbreviated as WCS) corresponding to the base station.

On the other hand, a subscriber places a WLL subscriber unit 12 (hereinafter referred to as WS
Abbreviated as U. ) Is installed on the telephone network subscriber side fixed terminal device, and the fixed terminal device may be a subscriber telephone (otherwise, a facsimile terminal, a computer, etc.).
4 are connected by a wiring cable.

[0006] The PHS-WLL system applies PHS to a line between the WCS 10 and the WSU 12. That is, the WCS 10 and the WSU 12 are, for example, time-division multiple access (TDMA) using radio waves having a frequency of about 1 to 3 GHz. Therefore, the 32 kbps ADPCM signal addressed to a certain subscriber transmitted to the WCS 10 is transmitted, for example, by time division multiplexing with a signal addressed to another plurality of subscribers. WSU12
Receives this and performs processing such as taking out a signal addressed to itself.

FIG. 6 is a schematic diagram showing a WSU installed at a subscriber's house. As described above, WCS 10 and WSU
The radio wave transmitted to and received from the WSU 12 has a frequency in the quasi-microwave band, for example, so that the antenna 20 of the WSU 12 has directivity and is installed toward the WCS 10. Since this antenna 20 is installed outdoors, it can be stored in an antenna protection case 22 in order to avoid the influence of weather and the like, specifically, to prevent damage to the antenna due to wind, rain, snow, and salt damage on the coast. It is considered.

[0008] The WSU main unit 24 is installed in a subscriber's house and operates using, for example, a 100 V commercial power supply. W
The SU main body 24 and the antenna 20 are connected by a coaxial cable 26 that easily transmits a high-frequency signal. WS
A telephone 28 and the like are connected to the U body 24 by a two-wire cable 30.

FIG. 7 is a schematic block diagram showing the configuration of a conventional WSU. The WSU main unit 24 is mainly composed of a radio unit 4 for transmitting / receiving a radio signal and modulating / demodulating a TDMA signal.
0, a subscriber interface unit 4 that modulates a radio signal or processes a baseband signal demodulated from the radio signal
2. A control unit 44 for controlling them and a power supply unit 46 for supplying power to them are built in one housing. The radio unit 40 and the antenna 20 are connected by a coaxial cable with little loss of a high-frequency signal. The control unit 44
These are controlled via a bus connected to the radio unit 40 and the subscriber interface 42. In general, the radio unit 40 and the subscriber interface 42 are connected using four or more signal lines for simultaneously transmitting and receiving signals in both directions. On the other hand, the subscriber interface 42 and the telephone 28 are connected by a two-wire cable according to the specifications of the telephone 28.

The control unit 44 also controls a light emitting diode (LED) for displaying the operating state of the WSU. Further, a switch for setting an operation mode and the like and a connector for connecting a maintenance console for operation inspection are provided on the housing of the WSU main body, and these are connected to the control unit 44.

The power supply section 46 includes a converter for converting a commercial AC power supply to a DC power, and a battery for backing up the operation at the time of a power failure or the like.

[0012]

As described above, the conventional WSU has its main body installed in a house. This WSU body 2
4 and the antenna 20 are connected by a low-loss coaxial cable, but the loss is not so small.
From the distance from the building to the room and from the point of entry into the room
There is a problem in that the transmission quality is increased according to the distance to the U main body, resulting in deterioration of transmission quality and the like. On the other hand, in order to avoid this problem, if the WSU main body is installed as close as possible to the place where the coaxial cable is led indoors and the wiring distance of the coaxial cable indoors is shortened, the installation place of the WSU main body is restricted. Cause problems.

Another problem is that the size and weight of the WSU body are not sufficiently reduced. Therefore, for example, when mounting the WSU body on an indoor wall, the strength of the wall must be taken into consideration, which is another constraint on the installation location, and special consideration and labor are required for installation work. There was a problem that there is a possibility. In addition, there is an opinion that the existence of such a device indoors impairs the aesthetics of the room, especially among individual subscribers, and that there is a problem in arranging furniture and the like, and there are also problems in the living environment. Was.

Further, in order to perform maintenance of a WSU or the like, it is necessary to connect a maintenance console to the indoor WSU body, and maintenance work must be adjusted to the convenience of the subscriber, resulting in poor maintenance work efficiency. There was also.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in particular, it has been proposed to reduce the loss of high-frequency signals from an antenna to the WSU main body to improve communication quality, and to improve communication quality.
An object of the present invention is to provide a telephone network subscriber-side fixed terminal device that facilitates installation work and maintenance work of an SU.

[0016]

SUMMARY OF THE INVENTION A telephone network subscriber-side fixed terminal device according to the present invention is provided in a telephone network in which a subscriber line is constructed wirelessly, and is installed at a subscriber's home to connect the subscriber telephone to the subscriber line. A fixed terminal device connected to a telephone network subscriber side, comprising: an antenna unit having the wireless transmitting / receiving antenna; and a subscriber home unit connected between the antenna unit and the subscriber telephone. The antenna unit includes a wireless circuit unit that performs modulation and demodulation to mutually convert a radio frequency signal and a baseband signal, and the transmitting / receiving antenna in close proximity to each other. It has a built-in baseband circuit for converting between signals and input / output signals at the subscriber telephone.

In the telephone network subscriber-side fixed terminal device according to the present invention, the antenna unit and the subscriber home unit include:
An interface circuit for converting a transmission signal between the wireless circuit unit and the baseband circuit unit into a two-wire transmission system is provided, and the antenna unit and the subscriber unit are connected by a two-wire cable. It was done.

In the telephone network subscriber-side fixed terminal device according to the present invention, the antenna unit has a control circuit unit for controlling the radio circuit unit and the baseband circuit unit, and the two-wire cable includes: The control signal is transmitted between the baseband circuit section and the control circuit section.

In the telephone network fixed terminal device according to the present invention, the antenna unit has a power supply unit for supplying power to the radio circuit unit and the baseband circuit unit. The power supply to the band circuit unit is performed by superimposing on a signal transmitted on a wiring connecting the antenna unit and the subscriber home unit.

In the telephone network subscriber-side fixed terminal device according to the present invention, the antenna unit has a connector to which a maintenance console is connected when the device is inspected.

[0021]

Next, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment] FIG. 1 is a schematic diagram of a subscriber's house in which a WSU according to a first embodiment of the present invention is installed. The WSU according to the present invention includes an antenna unit 50 installed on the outside of a subscriber's house, for example, on an outer wall or a roof of a building, and a home unit (subscriber home unit) 52 installed on an indoor of a subscriber's house, for example. It consists of.

The antenna unit 50 has an antenna 62 and an outdoor circuit section 64 inside an antenna protection case 60. Since radio waves transmitted and received between the WCS and the WSU have, for example, a frequency in a quasi-microwave band, the antenna antenna 62 has directivity and is installed toward the WCS. The antenna 62 having directivity has, for example, a structure in which a plurality of rod-shaped beam elements are combined. On the other hand, the antenna protection case 60 is
2 is configured to wrap the whole, for example, a cylindrical shape. That is, a considerable proportion of gaps exist in the space inside the antenna protection case 60. The outdoor circuit section 64 is accommodated in a position in the gap that does not impair the function of the antenna 62. Therefore, the antenna unit 50 is connected to the outdoor circuit unit 6.
It is not necessary to increase the size of the antenna unit 4 in order to store it, and it is possible to maintain the same compact shape as the conventional antenna unit.

The outdoor circuit section 64 includes a radio section for performing mutual conversion between a high-frequency signal used for radio communication and a signal (baseband signal) having a frequency lower than that used for normal signal processing. Contains. That is, since the signal between the antenna unit 50 and the in-home unit 52 is not a high-frequency signal, there is no need to connect both units with a coaxial cable, and for example, the two units can be connected with a two-wire cable 66 or the like.

The home unit 52 is connected to an indoor, for example, a commercial 100 V power supply, and each unit of the apparatus is driven by a predetermined DC voltage generated from the power supply. The home unit 52 is connected to the telephone 68 via a two-wire cable.
Is connected.

FIG. 2 is a schematic block diagram of the WSU according to the first embodiment of the present invention. The outdoor circuit unit 64 housed in the antenna unit 50 includes a wireless unit 80 (wireless circuit unit) and a home unit interface unit 82
And a control unit 84. On the other hand, the home unit 52 includes a subscriber interface unit 90 (baseband circuit unit) and an outdoor unit interface unit 92.
, A control unit 94, and a power supply unit 96.

The radio section 80 is connected to the antenna 62 by a coaxial cable having a small loss of a high-frequency signal. By storing the outdoor circuit section 64 in the antenna unit 50, the length of the coaxial cable is extremely short. You.
Therefore, the transmission loss of the signal in this portion becomes so small as to be negligible.

The radio section 80 having the main function of the outdoor circuit section 64 includes a transmission / reception circuit 90, a modulation / demodulation circuit 92, and a TDMA control circuit 94. The transmission / reception circuit 90 includes a transmitter, a receiver, a synthesizer, and the like. The transmission / reception circuit 100 basically performs mutual frequency conversion between a high-frequency signal and a baseband signal used for wireless transmission. The modulation and demodulation circuit 102 performs modulation and demodulation using a pseudo noise (PN) code. That is, for example, at the time of reception, the modem 102
Demodulates the signal scrambled by the PN code and extracts the signal. The TDMA control circuit 104 is a circuit that performs control for transmission by the TDMA method. For example, T
At the time of reception, the DMA control circuit 104 performs processing such as taking out the slot destined for itself from the time-division multiplexed and transmitted slots, further removing the synchronization signal for adjusting the frame timing, and taking out only the transmission data.

On the other hand, a subscriber interface unit 90 having a main function of the home unit 52 includes an ADPCM encoder / decoder 110 and a subscriber circuit (SLIC: Subscriber L).
ineInterface Circuit) 112 and a power supply circuit 114. The ADPCM encoder / decoder 110 receives the ADPCM extracted by the radio unit 80 at the time of reception, for example.
The signal is converted to a linear PCM signal, and the reverse process is performed at the time of transmission.

The subscriber interface unit 90 and the telephone 6
8 and 2 according to the specifications of the conventional telephone 68.
It is necessary to connect with a line cable. An interface between the WSU and the telephone 68 is provided by the SLIC 112, which converts between two wires and four wires and supplies power to the telephone 68. This power is supplied by the power supply circuit 11
4, the DC voltage of -48V, for example,
This is done by superimposing the two-line signal to

The radio section 80 of the outdoor circuit section 64 and the subscriber interface section 90 of the in-home unit 52 respectively perform transmission processing and reception processing in parallel. A 4-wire cable is required for transmission between the home unit 52 and each other. However, in this apparatus, the outdoor circuit unit 64 and the home unit 52 are connected by the two-wire cable 66. Therefore, a circuit for interfacing each of the wireless unit 80 and the subscriber interface unit 90 with the two-wire cable is required. It is. The in-home unit interface unit 82 and the outdoor unit interface unit 92 are interface circuits for performing such two-wire to four-wire conversion, respectively. These interface units 82 and 92
Have multiplexing / demultiplexing circuits 122 and 124 and echo cancellers 126 and 128, respectively, and perform multiplexing and demultiplexing of transmission / reception data and control signals, and are conventionally used.

In this device, the antenna unit 50
(That is, the outdoor circuit unit 64) and the home unit 52 are connected by a two-wire cable 66. Usually, the indoor wiring of the telephone is performed by a two-wire cable, and the existing indoor wiring by two wires is used. This is because when exists, it can be used for connection between the outdoor circuit section 64 and the home unit 52. Therefore, the connection between the outdoor circuit section 64 and the in-home unit 52 is performed by, for example, a four-wire cable, so that the in-home unit interface section 82 and the outdoor unit interface section 92 are not required.

The outdoor unit interface 9
The power supply circuit 120 provided in the power supply 2 supplies power from the home unit 52 to the outdoor circuit unit 64. The power supply circuit 120
A DC voltage of, for example, several volts required for driving the outdoor circuit section 64 is generated, and is superimposed on a signal of the two-wire cable 66 and supplied to the outdoor circuit section 64.

A control unit 84 provided in the outdoor circuit unit 64
Controls the wireless unit 80 and the home unit interface unit 82 via a bus. Similarly, the control unit 94 provided in the home unit 52 controls the above-described subscriber interface unit 90 and outdoor unit interface unit 92 via a bus.

The control section 84 of the outdoor circuit section 64 has an interface for connecting a maintenance console. By providing the interface for the maintenance console in the outdoor circuit unit 64 in this manner, the maintenance worker can perform maintenance without entering the subscriber's house. That is, the maintenance worker can connect the maintenance console to the antenna unit 50 attached to, for example, the outer wall of the subscriber's house, and perform a folding test with the telephone 68 to check the operation state of the apparatus.

On the other hand, the control unit 94 of the home unit 52
A light emitting diode (L) for indicating the operation state of WSU
ED) and switches for setting operation modes and the like. These LEDs, switches, and the like are arranged, for example, in the housing of the home unit 52. Since the subscriber can grasp the status of the device, such as normal / abnormal, from the lighting state of the LED and the like, operate the switch to change the setting, or contact the telephone company to inspect and repair by a maintenance worker. Request can be performed as needed.

The subscriber interface unit 90 and the telephone 6
8 and 2 according to the specifications of the conventional telephone 68.
Connected with a line cable.

The power supply unit 96 provided in the home unit 52 includes a converter for converting a commercial AC power supply to a DC power, and a battery for backing up operation at the time of a power failure or the like.

According to the configuration of the WSU described above, the wireless unit 80 is separated from the subscriber interface unit 90 and housed in the gap between the antenna units 50, so that the home unit 52 can be reduced in size and weight and the coaxial cable can be reduced. Can be eliminated. That is, the transmission loss of the high-frequency signal is suppressed by eliminating the coaxial cable wiring, and the communication quality is improved. In-home unit 5
2 is reduced in size and weight, and the antenna unit 50 and the in-home unit 52 are connected by a two-wire cable, and are released from the restriction that the wiring distance of the coaxial cable must be suppressed. The restrictions on the position are remarkably relaxed. Specifically, it can be freely installed at a place distant from the place where it is drawn from the outdoors to the indoors, and can be installed at a place where the strength of the wall is weak, for example, without reinforcement. In relation to the arrangement of furniture and the like, the position of the furniture and the like is determined first, and then the home unit 52 can be placed in the empty space.

Further, by reducing the volume of the circuit housed in the home unit 52, for example,
The degree of freedom in terms of shape, such as making the 2 thinner, is also increased, and it is possible to provide a device with a more favorable design for the subscriber.

As described above, the wiring between the antenna unit 50 and the home unit 52 is performed not by a coaxial cable but by a two-wire cable, so that the existing telephone system used in the conventional telephone system is used. If you have a two-wire cable, you can use it. Also, when newly arranging, the two-wire cable is thinner and flatter than the coaxial cable, so that it is hardly noticeable even if the wall is crawled. It is not noticeable or impedes traffic.

The outdoor circuit section 64 includes an antenna protection case 60.
Since the antenna unit 50 is housed inside the antenna unit 50, the outdoor circuit unit 64 and the antenna 62 do not need to be separately installed, and installation work outdoors can be facilitated. In addition, since a maintenance console can be connected to the outdoor circuit section 64 to inspect the apparatus, there is no need to enter the subscriber's house, and maintenance work is facilitated.

[Second Embodiment] A schematic configuration of a WSU according to a second embodiment of the present invention is similar to that of the above-described embodiment shown in FIG. In other words, this device also has the antenna unit 5
0 and the home unit 52. Regarding the present device described below, the same components as those in the above embodiment are denoted by the same reference numerals, and the description is simplified.

The configuration of the present apparatus is basically the same as in the above embodiment. The difference is that in the present apparatus, the control of the in-home unit 52 is performed by the control unit 84 provided in the outdoor circuit unit 64. FIG. 3 is a schematic block diagram of the home unit 52 of the present apparatus. Home unit 5 by the control unit 84
By performing the control of 2, the control unit 94 of the in-home unit 52, which has been present in the above embodiment, does not exist in the present apparatus, and the size and weight of the in-home unit 52 can be further reduced. it can.

Signal transmission between the control unit 84 of the outdoor circuit unit 64 and the home unit 52 is performed via the home unit interface unit 82, the outdoor unit interface unit 92, and the two-wire cable 66. That is, the control unit 84
From the home unit interface unit 8
At 2, it is multiplexed with other data signals transmitted to and received from the wireless line and output to the two-wire cable 66. In the outdoor unit interface section 92, the control signal separated by the multiplexing / demultiplexing circuit 224 from the signal received from the two-wire cable 66 is transmitted to the ADPCM encoder / decoder 110,
It controls the LED and the like.

[Third Embodiment] Hereinafter, a WSU according to a second embodiment of the present invention will be described. This device is also divided into an antenna unit and a home unit. Regarding the present device described below, the same components as those in the above embodiment are denoted by the same reference numerals, and the description is simplified.

FIG. 4 is a schematic block diagram of the present apparatus. The basic configuration of this device is basically the same as that of the second embodiment. The difference is that the power supply unit 96 for supplying power to the device is provided not in the home unit 300 but in the outdoor circuit unit 302. Outdoor circuit section 302
The power supply part 96 provided in the antenna protection cover is housed inside the antenna protection cover using a clearance space. This allows
The home unit 300 is further reduced in size and weight.

Since the power supply section 96 is provided in the outdoor circuit section 302, a power plug is taken out from the antenna unit 304 and inserted into a power outlet provided on, for example, an outer wall of a building.

Note that, as in the second embodiment, the present apparatus has a configuration in which control of the home unit 300 is performed by the control unit 84 of the outdoor circuit unit 302. However, the configuration in which the power supply unit 96, which is a feature of the present apparatus, is provided on the antenna unit 304 side to reduce the size of the in-home unit 300 is similar to the configuration in which the in-home unit 52 includes the control unit 94 as in the first embodiment. It is possible to apply.

[0050]

According to the fixed terminal device on the telephone network subscriber side of the present invention, the radio circuit section is housed in the antenna unit, so that the home unit can be reduced in size and weight, and the wiring by the coaxial cable can be greatly reduced. And the transmission loss of the high-frequency signal is suppressed to improve the communication quality. By reducing the size of the in-home unit and the restriction that the wiring distance between the antenna unit and the in-house unit must be suppressed with a coaxial cable, the restriction on the installation position of the in-home unit is remarkably relaxed. There is an effect that. Specifically, it can be freely installed at a place distant from the place where it is drawn from the outdoors to the indoors, and can be installed at a place where the strength of the wall is weak, for example, without reinforcement. Further, since the wireless circuit portion is housed in the antenna protection case and integrally formed as an antenna unit, an effect of facilitating outdoor installation work can be obtained.

According to the telephone network subscriber-side fixed terminal device of the present invention, the antenna unit and the home unit each have an interface circuit for converting a transmission signal between them into a two-wire transmission system. As a result, if there is an existing two-wire cable used in the conventional telephone system, the existing two-wire cable can be used to install the antenna unit and the in-home unit, and the installation work is simplified. .

According to the fixed terminal device on the telephone network subscriber side of the present invention, since the control circuit for controlling the home unit is provided in the antenna unit, there is no need to provide the control circuit in the home unit. Can be further reduced in size and weight.

According to the fixed terminal device on the telephone network subscriber side of the present invention, the power supply unit is provided in the antenna unit, and power is supplied to the home unit by a signal transmitted on the wiring connecting the antenna unit and the home unit. Since the superimposition is performed, there is no need to provide a power supply unit in the home unit, and an effect that the home unit can be further reduced in size and weight can be obtained.

According to the telephone network subscriber-side fixed terminal device of the present invention, the antenna unit 50 has a connector to which the maintenance console is connected, so that the maintenance worker can inspect the device without entering the subscriber's house. Can be performed, and an effect that maintenance work becomes easy can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a subscriber's house where a WSU according to a first embodiment of the present invention is installed.

FIG. 2 is a schematic block configuration diagram of a WSU according to the first embodiment of the present invention.

FIG. 3 is a schematic block diagram of a home unit of a WSU according to a second embodiment of the present invention.

FIG. 4 is a schematic block diagram of a WSU according to a third embodiment of the present invention.

FIG. 5 is a schematic system configuration diagram of an example of a PHS-WLL system.

FIG. 6 is a schematic diagram of a subscriber's house where a conventional WSU is installed.

FIG. 7 is a schematic block diagram of a conventional WSU.

[Explanation of symbols]

50,304 antenna unit, 52,300 home unit, 60 antenna protection case, 62 antenna, 64,302 outdoor circuit section, 66 2-wire cable,
68 telephone, 80 radio unit, 82 home unit interface unit, 84, 94 control unit, 90 subscriber interface unit, 92 outdoor unit interface unit, 96 power supply unit, 100 transmission / reception circuit, 102 modulation / demodulation circuit, 104 TDMA control circuit, 110 ADP
CM encoder / decoder, 112 SLIC, 114, 12
0 feeding circuit, 122, 124 multiplexing / demultiplexing circuit, 12
6,128 Echo canceller.

Claims (5)

[Claims] In a telephone network in which a subscriber line is constructed by radio, a telephone network subscriber-side fixed terminal device installed at a subscriber's house and connecting a subscriber telephone to the subscriber line, wherein: An antenna unit having a transmitting and receiving antenna, and a subscriber home unit connected between the antenna unit and the subscriber telephone, wherein the antenna unit performs modulation and demodulation, and performs a radio frequency signal and a baseband signal. And a transmission / reception antenna disposed in close proximity to each other, wherein the subscriber unit is a baseband that converts between the baseband signal and an input / output signal at the subscriber telephone. A fixed terminal device on the side of a telephone network subscriber, comprising a circuit unit. 2. The antenna unit and the customer premises unit each have an interface circuit for converting a transmission signal between the radio circuit unit and the baseband circuit unit into a two-wire transmission system, The telephone network subscriber-side fixed terminal device according to claim 1, wherein the unit and the subscriber unit are connected by a two-wire cable. 3. The antenna unit according to claim 1, further comprising a control circuit for controlling the radio circuit and the baseband circuit, wherein the two-wire cable is connected to the baseband circuit and the control circuit. 3. The fixed terminal device according to claim 2, wherein said fixed terminal device transmits a control signal between said terminals. 4. The antenna unit has a power supply unit that supplies power to the wireless circuit unit and the baseband circuit unit, and power is supplied from the power supply unit to the baseband circuit unit through the antenna unit. The telephone network subscriber-side fixed terminal device according to any one of claims 1 to 3, wherein the transmission is performed while being superimposed on a signal transmitted on a wire connecting the subscriber home unit. 5. The telephone network subscriber side according to claim 1, wherein the antenna unit has a connector to which a maintenance console is connected at the time of inspection of the device. Fixed terminal device.