JPS61276462A - Subscriber line test system for pcm carrier equipment - Google Patents

Abstract

PURPOSE:To allow the exchange side to execute the subscriber line test easily and quickly by transmitting and receiving a test instruction and a test result data between a subscriber line test section and a modulator/demodulator section of the exchange side. CONSTITUTION:The test circuit for optional subscriber lines 2, 3 is formed by operating a switch 50 so as to apply switching connection to switching contacts of an optional corresponding channel of a PCM carrier of the exchange side and a PCM carrier equipment of the subscriber side. Then a test operation section 39 is operated to send various test instructions from a modulation/ demodulation section 40 of the exchange side and they are received by a modulation/demodulation section 44 of the subscriber side. A subscriber test section 47 conducts various tests of the subscriber lines 2, 3 according to the inputted test instructions and the test result data are transferred to the modulation/demodulation section 40 through the modulation/demodulation section 44. Thus, the maintenance personnel discriminates the test result of optional subscriber lines depending on the output data from the modulation/demodulation section 40.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a subscriber line testing system in a PCM carrier interposed between a subscriber telephone and a switching device.

Summary of the Invention The present invention provides a switching contact on the subscriber side of a PCM transport device for inserting a subscriber line test device to be described later for each subscriber between the transport section and the subscriber line, and a control circuit for controlling the switching operation, a subscriber line testing section for testing the subscriber line connected via the switching contact, and a modulation/demodulation section connected to the transport section via the switching contact. Equipped with subscriber line testing equipment consisting of.

The exchange side of the PCM transport device is equipped with a switching contact for connecting the test command device described later, a switch for switching the switching contact, and a control circuit for controlling the control circuit on the subscriber side, corresponding to each channel. and a test operation section that sends and receives test commands and test result data to and from the modulation and demodulation section on the subscriber side via the modulation and demodulation section connected to the transport section via the switching contact. and a test command device.

An arbitrary subscriber line is connected to the subscriber line test section, and test commands and test result data can be exchanged between the subscriber line test section and the test operation section through the channel corresponding to the subscriber. It is.

Any subscriber line can be tested from the central office where the PCM transport device on the exchange side is installed.

Conventional technology When a plurality of subscriber telephones scattered in a depopulated area far from the central office building where the exchange is installed is accommodated in the exchange via a PCM carrier, the subscriber line test is performed using the P on the subscriber side.
After going to the office building where the CM transport device is installed and disconnecting the transport device from the subscriber line, a subscriber line tester is connected to the subscriber line.

Since the subscriber side carrier equipment is usually installed in a small unmanned station remote from the switching center, the conventional subscriber line testing method described above requires a lot of time and effort, and it is difficult to improve the efficiency of maintenance work. It has the disadvantage of making things worse. In addition, in order to test by connecting the measurement cord of the subscriber line tester to the connector part to which the subscriber line is connected, 2. To test multiple subscriber lines, change the connection of the measurement cord for each subscriber line. It is necessary to
It also has the disadvantage of being extremely complicated.

For this reason, there is a strong desire to be able to easily perform subscriber line testing from a transfer device on the exchange side.

Problems to be Solved by the Invention The present invention aims to reduce the time and labor required for testing by making it possible to test any subscriber line from the exchange side without going to the subscriber side transport device. It is.

Structure of the Invention The subscriber line test method of the PCM transport device of the present invention is as follows for each subscriber on the subscriber side of the PCM transport device, which is interposed between a subscriber telephone set and an exchange. A switching contact for inserting the subscriber line test device between the carrier and the subscriber line and a control circuit for controlling the switching operation of the switching contact are provided, and the subscriber line connected via the switching contact is provided. The system is equipped with a subscriber line test device consisting of a subscriber line test section for testing the PCM and a modem section connected to the carrier section via the switching contact, and the exchange side of the PCM carrier device is equipped with a A switching contact for connecting the test command device described later, a switch for switching the switching contact, and a control circuit for controlling the control circuit on the subscriber side are provided, and connected to the transport unit via the switching contact. the switch and the above-mentioned test command device; The present invention is characterized in that it is possible to test any subscriber line by operating the test operation section.

Embodiments of the Invention Next, one embodiment of the present invention will be described in detail with reference to the drawings.

FIGS. 1A and 1B are block diagrams showing a subscriber-side PCM transport device and an exchange-side PCM transport device, respectively, in one embodiment of the present invention.

As shown in FIG. 1A, a plurality of subscriber telephones 1 are connected to the subscriber side PCM transport device through respective subscriber lines 2.3. Switching contacts 6, 7 and switching contacts 11.12 are interposed between each line terminal a, b and the transport section 15, and under normal conditions, the subscriber telephone 1 is connected to switching contacts 6, 7 and 11.12.
The subscriber interface circuit IO is connected to the subscriber interface circuit IO through the subscriber interface circuit IO.

Both ends of the ace circuit IO are connected to communication lines 8, 9 . Switching contact 11.
12 and are connected to the corresponding channels of the conveyor 15 through capacitors 13 and 14. Subscriber interface circuit! 0 has a predetermined resistance value with respect to direct current and has a high impedance with respect to alternating current, which performs power supply to subscriber telephone a1, sending of a calling signal, detection of an off-hook signal, etc.

Therefore, the voice signal between the subscriber telephone fil and the transport section 15 is as follows:
Communication line 8.9, switching contact 11.12 and capacitor 1
3.14.

In normal times, the off-hook signal detected by the subscriber interface circuit 10 is input to the control circuit 18 through the signal line 17, and the off-hook signal is input to the control circuit 18 through the signal line 17. 6 converts an off-hook signal or the like into, for example, a 2-bit binary signal and sends it to the transport section 15 through the data line 18, and also from the transport section 15 to the data line 18.
The 2-bit binary signal inputted through the subscriber interface circuit 10 is converted into a calling signal, etc., and sent to the subscriber interface circuit 10 through the signal line 20. The transport unit 15 multiplexes the audio signals of each channel input via capacitors 13 and 14 and the binary signal input from the data line 18, converts it into a 2 Mbit/sec PCM signal, and sends it to the transmission line 21. The 2 megabit/second PCM signal input from the transmission line 22 is demodulated into an audio signal and a binary code signal, and the audio signal is sent to the capacitor 13, 14 of the corresponding channel and the switching contact 11.
．． 12, etc., to line terminals a and b, and the binary code signal is supplied to the control circuit IB of the corresponding channel via a data line 18.

As shown in FIG. 1(B), the PCM transport device on the exchange side has a configuration similar to that described above, and connects channels corresponding to each subscriber line of the transport unit 33 to the exchange interface circuit 2.
8 to the exchange 23, and the exchange 23 accommodates each subscriber line in correspondence. Therefore, the transmission and reception of signals between the exchange 23 and each telephone subscriber 1 and the transmission of voice signals are carried out by the carrier unit 1.
5.33, but since it has no direct relation to the present invention, its explanation will be omitted. Each channel of the transfer unit 33 on the exchange side has a switching contact 29 .
30 and wires 24 and 25, it is normally connected to the exchange 23, but when the switching contacts 29 and 30 are switched, it is connected to the modem section 40. The switch 50 is a switch for operating a relay operating circuit 51 provided for each channel, and when the relay operating circuit 51 operates, the switching contacts 29 and 3Q are switched to the dotted line side in the figure. Further, a switching instruction is issued from the relay operation circuit 51 via the switching instruction line 52, and the control circuit 34 converts the switching instruction into a binary code signal and inputs the signal to the conveying section 33 through the data line 38. The transport unit 33 transmits the switching instruction to the carrier 5 on the subscriber side by putting it on a 2 Mbit/sec PCM signal. Returning to FIG. 1A, the carrier section 15 on the subscriber side restores the switching instruction to a binary code signal and supplies it to the control circuit 16 through the data line 19. When the control circuit 1B on the subscriber side receives a switching command using the binary code signal, it transmits the relay operating circuit 5 through the switching command signal line 53.
4 to operate switching contacts 11.12 and 6.
7 to the dotted line side in the figure. By the above-described operation, the modem section 40 on the exchange side and the modem section 44 on the subscriber side are connected through corresponding channels, and the subscriber line test section 47 is connected to the subscriber line 2.3. That is, by operating the switch 50, the switching contacts 6, 7, 11, 12, 29, 30 of any corresponding channel of the exchange side PCM transport device and the subscriber side PCM transport device are switched to the dotted line side and connected. A test circuit for the subscriber line 2.3 can be formed.

After the test circuit is formed, the test operation section 38 is operated to send out various test commands, and the test commands are sent out from the modem section 40 on the exchange side and received by the modem section 44 on the subscriber side. . The subscriber line testing section 47 performs various tests on the subscriber lines 2 and 3 according to test commands input from the modulation/demodulation section 44, and the test result data is sent to the modulation/demodulation section 44 on the subscriber side.
The signal is transferred to the modulation/demodulation section 40 on the exchange side. Therefore, the maintenance person can determine the test result of any subscriber line 2.3 based on the data output from the modulation/demodulation section 40.

In this embodiment, there is no need for the maintenance person to go to the PCM transport device on the subscriber side in order to test the subscriber line, and he can connect any subscriber line by turning on any switch 50 provided corresponding to the channel. The subscriber line test section 47 is connected to the subscriber line test section 47.
Since test commands and test result data can be exchanged between the switch 7 and the modem section 40 on the exchange side, each subscriber line can be tested arbitrarily or sequentially easily and quickly.

Effects of the Invention As described above, in the present invention, any subscriber line is connected to the subscriber line testing section by operating a switch corresponding to the channel, and test commands are exchanged between the subscriber line testing section and the modem section on the exchange side. Since the configuration is configured so that test result data can be exchanged, the subscriber side PC can be used for subscriber line tests.
There is no need to go to the M carrier, and the subscriber line test can be easily and quickly performed from the office building where the PCM carrier on the exchange side is installed.

[Brief explanation of the drawing]

FIG. 1(A) shows a subscriber-side PC in an embodiment of the present invention.
Block diagram showing the M transport device, (B) is the switch side P
FIG. 2 is a block diagram showing a CM transport device. In the figure, l: subscriber telephone, 2, 3: subscriber line, 6
, 7, tt, t2, 2s, 3o: v'J replacement contact, 9: Call line, 10: Subscriber interface circuit, 13
, 14: Capacitor, 15: Subscriber side carrier section, 16 2 control circuit, 17: Signal line, 18, 19: Data line, 2
0: Signal line, 21.22: Transmission line, 23: Exchange, 2
4, 25: line, 28: exchange interface circuit, 2
9.30: Switching contact, 33: Transfer unit on exchange side, 34 Two control circuits, 35.38: Data line, 38, 3? : Signal line, 39; Test operation section, 40: Modulation/demodulation section on exchange side,
43: subscriber line test equipment, 44: subscriber side modulation/demodulation section,
47: subscriber line test section, 50: switch, 51: relay operation circuit, 52: switching instruction line, 53: switching instruction signal line,
54: Relay operating circuit.

Claims (1)

[Scope of Claims] In a PCM transport device interposed between a subscriber telephone set and an exchange, a subscriber line test device to be described later for each subscriber is installed on the subscriber side of the PCM transport device to connect the transport unit and the subscriber side. A subscriber line testing section for testing a subscriber line connected via the switching contact, comprising a switching contact to be inserted between the lines and a control circuit for controlling the switching operation of the switching contact; Equipped with a subscriber line test device consisting of a modem unit connected to the transport unit via the switching contacts, and on the exchange side of the PCM transport equipment, switching contacts for connecting the test command device described later are provided for each channel. and a switch for switching the switching contact and a control circuit for controlling the control circuit on the subscriber side; a test command device comprising a test operation unit that exchanges test commands and test result data with the modulation/demodulation unit on the subscriber side; A PC characterized by being able to test railway tracks
Subscriber line test method for M transport equipment.