JPS61171240A - Line check device of automobile telephone base station - Google Patents

Abstract

PURPOSE:To attain normal talking between a base station and other location and to conduct the line test by providing a line switch having a signal loopback function and a wired line connector having a signal loopback function of a wired line of the base station to a mobile set. CONSTITUTION:In conducting the line check, when a test signal from a control section 21 of an automobile telephone exchange station is transmitted, the test signal enters a transmitter 4 through a private line 3 and a wired line connector 14. The test signal is transmitted from the transmitter 4 in a transmission frequency fT, received by a radio equipment main body 17 of a mobile set through a directional coupler 15 and a duplexer 16, the signal goes to a voice band frequency signal, which enters a line switch 18. In checking private lines 3, 8 the connector 14 is activated by using a loopback control signal from a base station control section 26 receiving the control section 21 to apply the check of the control section 21 and lines 3, 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is directed to a wired line between a switching center and a base station using a test signal for maintenance of a mobile phone base station.

The present invention also relates to a line inspection device for a car telephone base station that tests a comprehensive wired line including a transmitter/receiver in the base station.

(Prior Art) Conventionally, there was a device of this type as shown in Fig. 3 (see Utility Application No. 183436/1983). 3 is a dedicated line connecting the test signal generator 2 of the inspection vehicle 1 and the transmitter 4; 5 is a frequency converter that converts the transmitting frequency fT of the transmitter 4 into the receiving frequency fR of the receiver 7; 6; 8 is a local frequency oscillator connected to the frequency converter 5, which oscillates a frequency equal to the difference between the transmitting frequency fT and the receiving frequency fR to operate the frequency converter 5. 8 is the receiver 7 and A dedicated line 9 connects with the inspection vehicle 1, and 9 is a control signal generator provided in the inspection vehicle 1, which operates the local frequency oscillator 8 through the dedicated line 10.11 is a control signal generator provided in the inspection vehicle 1. This is a Uv meter that is used to display the test signal returned from the receiver 7. Reference numeral 12 is a transmitting antenna, and 13 is a receiving antenna.

Next, the operation will be explained. When a test signal is sent out from the test signal generator 2 provided in the inspection vehicle 1, this test signal passes through the dedicated line 3, enters the transmitter 4, and is transmitted from the transmitter 4 at the transmission frequency fT. .

At that time, the test signal of the transmission frequency fT is input to the frequency conversion device 5, and in this frequency conversion device 5, the transmission frequency fT is The test signal is converted to the reception frequency fR of the receiver 7 and sent to the receiver 7. The test signal received by the receiver 7 is sent back to the inspection vehicle 1 through the dedicated line 8, and the line status is displayed on the UV meter 11 provided in the inspection vehicle 1.

[Problem that the invention seeks to solve]

Since the conventional inspection system is configured as described above, it is uneconomical to install equipment only for line inspection at the base station. It only checks the continuity status of the overall line for the car, and if there is a problem, it will tell you if it is a wired line problem or not.
There was a problem in that maintenance personnel at the inspection vehicle were unable to determine whether the fault was with the transmitter/receiver.

This invention was made to solve the above-mentioned problems, and it is possible to inspect the line of the base station and make telephone calls between the base station and other places, and also to prevent the failure of the wired line in the event of a failure. It is an object of the present invention to provide a line inspection device for a mobile phone base station that allows maintenance personnel to distinguish whether the failure is caused by a fault in the transmitter/receiver of the base station, or a failure in the transmitter/receiver of the base station.

[Means for solving problems]
J The line inspection device for a car telephone base station according to the present invention adds a test signal generation and line status display function to the exchange 11m section, and a car phone mobile unit is provided at the base station to perform transmission and reception between the mobile phone unit and the base station. The mobile station is equipped with a line switching device that connects the mobile device to the base station and also has a function of returning signals to the mobile station, and a wired line connecting device that has a function of returning only the wired line signal of the base station.

[Effect]

In this invention, a mobile device installed in the base station can make a call between the base station and other places, and a line switching device installed in the mobile device allows the mobile device to perform loopback operations to inspect the general wired line. Furthermore, the wired line connection device disconnects the wired line from the transmitter/receiver and only the wired line signal is looped back, making it possible to test the loopback of the wired line between the base station and the switching center.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a line inspection device for a car telephone base station according to an embodiment of the present invention, in which 21 has an added function of generating a test signal and displaying the line status based on the test signal input from the outside. Control unit of car telephone exchange,
4.7 is a base station transmitter and receiver for making calls between a car phone and a home phone, etc.; 22.24 is a base station control device that sends and receives various control signals for making calls. Transmitter and receiver, 3.8 is a telephone transceiver 4.7
23.25 A dedicated line connecting the exchange control unit 21 and the
27 and 28 are wired lines connecting the control transceivers 22 and 24 and the exchange control unit 21, and 27 and 28 are combiners and distributors.

Further, 15 is a directional coupler that takes out the transmission signal from the transmitter 4.22 of the base station, 20 is a directional coupler that sends the folded test signal to the receiver 7.24 of the base station, 14
is provided in the middle of the dedicated line 3.8, and is normally used for connection transmission/reception #IA4. a wired line connection device that connects 7 and the exchange control unit 21 and returns a signal from the exchange control unit 21 to the exchange control unit 21 when a return control signal is received;
7.19 is a radio main body (transmitter/receiver) and control unit (handset) of a mobile phone installed in a base station; 16 is a transmitter/receiver for communication and control; 4.22.7
．． A duplexer 18 is provided in the middle of the line between the radio device body 17 and the control unit 19, and normally connects the radio device body 17 and the control unit 19 to perform return control. When a signal is received, a line switching device returns the signal from the radio main body 17 to the radio main body 17, and 26 is a wired line connection device 14 based on a command from the exchange control unit 21 during line inspection.
Alternatively, 12.13 is a control unit of a base station in which a function of generating a return control signal is added to the line switching device 18, and 12.13 is a transmitting antenna and a receiving antenna.

Note that the control unit 21 of the above-mentioned exchange center. Control transceiver 22.24 in the base station. The base station control unit 26 and the control wire lines 23, 25 are normally used for controlling a car telephone system, and are not newly provided.

Next, the operation will be explained. The radio main body 17 of the mobile device in the base station is always connected to the transmitter 4 and the receiver 7 by the duplexer 16, and the radio main body 17 of the mobile device and the control unit 19 are connected to the line switching device 18.
Once connected, the mobile device can be used as a regular telephone.

When performing line inspection, when a test signal is sent from the control unit 21 of the mobile telephone exchange, this test signal is transmitted to the dedicated line 3. Through the wired line connection device 14, the transmitter 4
to go into. This test signal is transmitted from the transmitter 4 at a transmission frequency fT.
directional coupler 15 and duplexer 1.
6, the signal is received by the radio main body 17 of the mobile device, becomes a voice band frequency, and enters the line switching device 18. Here, the radio main body 17 of the mobile device is set to the frequency of the telephone transmitter 7, which is tested in advance by a control signal from the control transmitter 22. In addition, the line switching device 18 is connected to the mobile device in response to a return control signal from the base station control section 26 which has received a command from the switching center control section 21 . Connect the 1□0 receiver to the IMless device body, the 8-tone voice output terminal, and the 8-tone voice input terminal. Then, the test signal input to the line switching device 18 is looped back and input to the transmission audio input terminal of the mobile unit's radio unit 17, and the transmission frequency f of the mobile unit is changed from the mobile unit to the transmission frequency f of the mobile unit.
R, the test signal passes through the duplexer 16 and the directional coupler 20 and enters the base station telephone receiver 7.The test signal is then transmitted from the telephone receiver 7 to the wired line connection section 14.
．． It passes through the dedicated line 8 and is returned to the control unit 21 of the mobile telephone exchange, where the line status is inspected.

In addition, when inspecting the dedicated line 3.8, the wired line connection device 14 is operated by a return control signal from the base station control unit 26 that has received a command from the exchange control unit 21. 21° Dedicated transmission line 3. Line inspection of the dedicated reception line 8 and the exchange control unit 21 can be performed.

Note that the operations of the communication system and control system are the same as those conventionally known, so detailed explanation thereof will be omitted.

In the device of this embodiment as described above, since the mobile phone is provided in the base station, it is possible to make telephone calls between the base station and other locations. In addition, we have added a line inspection function to the switching center control unit, and we have also made it possible for the telephone mobile device to send a test signal from the telephone transmitter in the base station to the telephone receiver, making it possible to conduct line inspections. Since we installed a wired line connection device with a signal loopback function in the dedicated line of the telephone transmitter/receiver, when a line failure occurs, the switching center can determine whether it is a failure of the wired line or the base station's transmitter/receiver. Easily distinguishable by maintenance personnel.

In addition, in the above embodiment, a case was shown in which the conduction state of the line was tested, but as shown in FIG. By connecting the transmitters 31 and 32, the electrical performance of the transmitter and receiver can be tested.

〔Effect of the invention〕

As described above, according to the present invention, the function of generating a test signal and displaying the line status is added to the exchange control unit, and the base station is provided with a mobile phone mobile device, which is connected to the transmitter/receiver of the base station. In addition, a line switching device that provides the mobile device with a signal loopback function and a wired line connection device that has the signal loopback function of the base station's wired line are installed, so that the connection between the base station and other locations is In addition to being able to make normal calls, it also allows for line tests and is effective in determining the location of a failure.

[Brief explanation of drawings]

Fig. 1 is a connection diagram showing the configuration of a line inspection device for a car telephone base station according to an embodiment of the present invention, Fig. 2 is a connection diagram showing another embodiment of the invention, and Fig. 3 is a connection diagram of a conventional car telephone base station. FIG. 2 is a connection diagram showing a line inspection device of a base station. In the figure, 3 is a dedicated line, 4 is a call transmitter, 7 is a call receiver, 8 is a dedicated line, 14 is a wired line connection device,
16 is a duplexer, 17 is a radio device body of a mobile device, 1
Reference numeral 9 designates a control unit of the mobile device, 18 a line switching device, 21 a switching center control section, 22 a control transmitter, 24 a control receiver, and 26 a base station control section. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A dedicated line between the exchange control unit that generates a test signal and displays the line status based on the test signal input from the outside, the base station telephone transceiver, and the exchange control unit A wired line connection device is installed in the base station, which connects the telephone transmitter/receiver and the exchange control unit, and returns the signal from the exchange control unit to the exchange control unit when a return control signal is received. a duplexer that connects the base station's communication and control transmitter/receiver to the radio unit of the mobile phone, and a duplexer that connects the radio unit of the mobile phone and the control unit. A line switching device that connects the radio main body and the control unit and returns the signal from the radio main body to the radio main body when a return control signal is received, and a wired line connection device or a line switching device for line inspection. 1. A line inspection device for a car telephone base station, comprising: a base station control section having an added function of generating a return control signal;