JPH0626385B2 - Subscriber line test method for PCM carrier - Google Patents

Description

Description: INDUSTRIAL APPLICABILITY The present invention has been incorporated between a subscriber telephone and a switching device.
The present invention relates to a subscriber line test method for a PCM carrier.

SUMMARY OF THE INVENTION The present invention provides a switching contact for inserting a subscriber line test device, which will be described later for each subscriber, between a carrier and a subscriber line on the subscriber side of a PCM carrier, and a switching contact of the switching contact. A subscriber line test unit for testing a subscriber line connected via the switching contact and a modulation / demodulation unit connected to the transport unit via the switching contact. It is equipped with a subscriber line test device consisting of and a switching contact for connecting the test command device described later and a switch for switching the switching contact and the subscriber side on the switch side of the PCM carrier device for each channel. And a control circuit for controlling the control circuit, and a test command between the modulation / demodulation unit connected to the carrier unit via the switching contact and the modulation / demodulation unit on the subscriber side via the modulation / demodulation unit. Transfer of test result data A test command device composed of a test operation unit for receiving data is connected, and an arbitrary subscriber line is connected to the subscriber line test unit, and a subscriber line test unit is connected by a channel corresponding to the subscriber. Test finger commands and test result data can be exchanged between test operation units.

Any subscriber line can be tested from the station where the PCM carrier on the exchange side is installed.

When a plurality of subscriber telephones scattered in a sparsely populated area remote from the station where the exchange is installed are accommodated in the exchange through a PCM carrier, the subscriber line test is performed on the subscriber side.
After going to the station where the carrier is installed and disconnecting the carrier from the subscriber line, the subscriber line tester is connected to the subscriber line.

Since the carrier equipment on the subscriber side is usually installed in a small unmanned station remote from the exchange, the above-mentioned conventional subscriber line test method requires a lot of time and labor, and the efficiency of maintenance work is improved. It has the drawback of making it worse. Also, because the test cords of the subscriber line tester are connected to the connector section to which the subscriber lines are connected for testing, in order to test multiple subscriber lines, the measurement cords must be switched for each subscriber line. Must be
It also has the drawback of being extremely complicated.

Therefore, it has been earnestly desired that a subscriber line test can be easily performed from a transfer device on the exchange side.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention is intended to reduce the time and labor required for a test by allowing an arbitrary subscriber line to be tested from the exchange side without going to the carrier device on the subscriber side. Is.

Constitution of the invention The subscriber line test method for the PCM carrier of the present invention is described below for each subscriber on the subscriber side of the PCM carrier, in the PCM carrier interposed between the subscriber telephone and the exchange. A switching contact for inserting the subscriber line test device between the carrier section and the subscriber line and a control circuit for controlling the switching operation of the switching contact are provided, and the subscriber line connected through the switching contact is provided. It is equipped with a subscriber line test unit for testing the subscriber line test unit and a modulation / demodulation unit connected to the carrier unit via the switching contact, and the switch side of the PCM carrier unit corresponds to each channel, A switching contact for connecting a 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. Modulation and demodulation section And a test command device configured to exchange test instructions and test result data with the modulation / demodulation unit on the subscriber side via the modulation / demodulation unit. It is characterized in that an arbitrary subscriber line can be tested by operation.

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

1 (A) and 1 (B) are block diagrams showing a subscriber side PCM carrier and an exchange side PCM carrier in one embodiment of the present invention, respectively.

As shown in FIG. 1 (A), a plurality of subscriber telephones 1 are connected to the subscriber side PCM carrier via subscriber lines 2 and 3, respectively. Switching contacts 6 and 7 and switching contacts 11 and 12 are provided between the line terminals a and b and the transport unit 15, and the subscriber telephone 1 normally operates through the switching contacts 6 and 7 to the subscriber interface circuit. 10 is connected to both ends of the subscriber interface circuit 10, and the call lines 8 and 9 and the switching contacts 11 and 1
2 and the capacitors 13 and 14 are connected to the corresponding channels of the transport unit 15. Subscriber interface circuit 10
Performs power supply to the subscriber telephone set 1, transmission of a calling signal, detection of an off-hook signal, and the like. It has a predetermined resistance value for direct current and high impedance for alternating current. Therefore, the voice signal between the subscriber telephone set 1 and the carrier section 15 includes the communication lines 8 and 9, the switching contacts 11 and 12, and the capacitor 1.
Transmitted through 3,14.

In normal times, the off-hook signal detected by the subscriber interface circuit 10 is input to the control circuit 16 through the signal line 17, and the control circuit 16 converts the off-hook signal or the like into, for example, a 2-bit binary signal, and the data line 18 is supplied. Through transport section 15
To a signal line by converting a 2-bit binary signal input from the transport unit 15 via the data line 19 into a calling signal or the like.
Send to subscriber interface circuit 10 via 20. Transport section 15
Is a multiplex of the audio signal of each channel input via the capacitors 13 and 14 and the binary signal input from the data line 18 to be converted into a PCM signal of 2 megabits / second and sent to the transmission line 21, In addition, 2 megabits /
The second PCM signal is demodulated into a voice signal and a binary code signal, and the voice signal is sent to the line terminals a and b through the corresponding channel capacitors 13 and 14 and the switching contacts 11 and 12, and the binary code signal is the data. It is supplied by the line 19 to the control circuit 16 of the corresponding channel.

As shown in FIG. 1 (B), the PCM transfer device on the exchange side is
With the same configuration as described above, the channels corresponding to the respective subscriber lines of the transport unit 33 are connected to the exchanges 23 via the exchange interface circuits 28, and the exchanges 23 are made to accommodate the respective subscriber lines. Therefore, signal exchange and voice signal transmission between the exchange 23 and each subscriber telephone set 1 are performed through the corresponding channels of the carrier units 15 and 33, but the description thereof is omitted because it is not directly related to the present invention. Each channel of the transfer section 33 on the exchange side is normally connected to the exchange 23 by the switching contacts 28, 30 and the lines 24, 25, respectively.
Is switched to the modulation / demodulation unit 40. The switch 50 is a relay operating circuit 51 provided for the channel.
Is a switch for operating the relay operating circuit 51
Is operated, the switching contacts 29, 30 are switched to the dotted line side in the figure. Further, a switching instruction is issued from the relay operation circuit 51 through the switching instruction line 52, and the control circuit 34 converts the above switching instruction into a binary code signal and inputs it to the transport section 33 through the data line 38. The transport unit 33 sends the switching instruction to the transport unit 15 on the subscriber side, carrying the 2 megabit / second PCM signal. Returning to FIG. 1 (A), 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 16 on the subscriber side receives the switching command by the binary code signal, the switching command signal line 53
The relay operating circuit 54 is operated through the switching contacts 11 and 12.
And the switching contacts 6 and 7 are switched to the dotted line side in the figure. By the above-mentioned operation, the modulation / demodulation unit 40 on the exchange side and the modulation / demodulation unit 44 on the subscriber side are connected by the corresponding channels, and the subscriber line test unit 47 is connected to the subscriber lines 2 and 3. . That is, by operating the switch 50, the switching contacts 6, 7, 11, 12, 29, 30 of any corresponding channels of the exchange side PCM carrier and the subscriber side PCM carrier are switched and connected to the dotted line side. Can form a test circuit for arbitrary subscriber lines 2 and 3.

After the test circuit is formed, the test operation unit 39 is operated to send various test commands, and the test commands are sent from the modulation / demodulation unit 40 on the exchange side and received by the modulation / demodulation unit 44 on the subscriber side. . The subscriber line test unit 47 performs various tests on the subscriber lines 2 and 3 according to the test command input from the modem unit 44,
The test result data is transferred to the modulation / demodulation unit 40 on the exchange side via the modulation / demodulation unit 44 on the subscriber side. Therefore, the maintenance person can judge the test result of any of the subscriber lines 2 and 3 based on the data output from the modulation / demodulation unit 40.

In this embodiment, the maintenance person does not have to go to the PCM carrier of the subscriber side to test the subscriber line, and any switch 50 provided for the channel is turned on to join the arbitrary subscriber line. Since the test command and the test result data can be exchanged between the subscriber line test unit 47 and the modulation / demodulation unit 40 on the exchange side by connecting to the subscriber line test unit 47, the test of each subscriber line can be performed arbitrarily or sequentially. The effect is that it can be performed easily and quickly.

As described above, in the present invention, an arbitrary subscriber line is connected to the subscriber line test section by a switch operation corresponding to the channel, and between the subscriber line test section and the modulation / demodulation section on the exchange side. Since it is configured so that test commands and test result data can be sent and received, the subscriber side PCM can be used for the subscriber line test.
There is no need to go to the carrier, and the subscriber line test can be performed easily and quickly from the station building where the PCM carrier on the exchange side is installed.

[Brief description of drawings]

FIG. 1 (A) is a subscriber side PCM in one embodiment of the present invention.
A block diagram showing the transfer device. The diagram (B) shows the exchange side PCM.
It is a block diagram which shows a conveying apparatus. In the figure, 1: subscriber telephone, 2, 3: subscriber line, 6,
7,11,12,29,30: Switching contacts, 8, 9: Call line, 10: Subscriber interface circuit, 13,14: Capacitor, 15: Carrier on carrier side, 16: Control circuit, 17: Signal Line, 18, 19:
Data line, 20: Signal line, 21, 22: Transmission line, 23: Switch, 2
4,25: line, 28: exchange interface circuit, 29,30: switching contact, 33: exchange side transfer section, 34: control circuit, 35,3
8: Data line, 36, 37: Signal line, 39: Test operation unit, 40: Switching side modulation / demodulation unit, 43: Subscriber line testing device, 44: Subscriber side modulation / demodulation unit, 47: Subscriber line testing unit , 50: Switch, 5
1: Relay operating circuit, 52: Switching instruction line, 53: Switching instruction signal line, 54: Relay operating circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-55-105465 (JP, A) JP-A-54-75916 (JP, A) JP-A-56-28549 (JP, A)

Claims (1)

[Claims] 1. A PC interposed between a subscriber telephone and an exchange.
In the M carrier device, on the subscriber side of the PCM carrier device, the switching contact for inserting the subscriber line test device described later for each subscriber between the carrier part and the subscriber line and the switching operation of the above switching contact are performed. A control circuit for controlling is provided, and comprises a subscriber line test unit for testing a subscriber line connected via the switching contact and a modulation / demodulation unit connected to the carrier unit via the switching contact. Equipped with a subscriber line test device, the switch side of the PCM carrier corresponds to each channel, a switching contact for connecting the test command device described later, a switch for switching the switching contact, and the control circuit on the subscriber side. A control circuit for controlling the transmission / reception of test commands and test result data between the modulation / demodulation unit connected to the transport unit via the switching contact and the modulation / demodulation unit on the subscriber side via the modulation / demodulation unit. Line Includes a test command device comprising the Hare test operating unit, PCM, characterized in that allowed the testing of the switches and the above by connexion optionally testing the operating portion of the operating subscriber line
Subscriber line test method for carrier equipment.