JPS63211855A - Subscriber circuit interface device - Google Patents

Abstract

PURPOSE:To make the device advantageous in the economy by providing a subscriber line drawing switch to a subscriber circuit and a standby subscriber circuit and connecting the subscriber line side terminal of the standby subscriber circuit to a subscriber circuit test line. CONSTITUTION:Various test to each subscriber circuit are conducted in the process of the incoming or outgoing connection to a subscriber and a fault of a subscriber circuit 101 is found out by the test. If a fault is found out, the maintenance personnel gives a command instruction to turn off the drawing switch 105 of the subscriber circuit 101 and to turn on a test switch 109, to acquire an idle standby subscriber circuit 103, for example, to turn on the switch 107 and to turn off a test switch 111, on the other hand. Thus, the connection path comprising subscriber A- test switch 109 of subscriber circuit 101- subscriber circuit test line 13- drawing switch 107- inside of standby subscriber circuit 103 is formed in this way.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a subscriber circuit interface device for a digital electronic exchange, which is particularly economical and can be used even when the number of subscribers and the number of subscriber types increases. The present invention relates to a subscriber circuit interface device that can be easily adapted.

[Conventional technology]

FIG. 2 is a block diagram showing a portion of a digital electronic exchange using a conventional subscriber circuit interface device. The subscriber lines 211, 212.22 and the subscriber circuit switch interface device 25 are connected by a subscriber circuit interface device 23.24. The subscriber circuit interface device 23 has a subscriber circuit 231,
232, its subscriber line test terminal 231 a
, 232a are connected in duplicate, and subscriber circuit test line 2
7 to the input side of the test circuit selection switch 26. In addition, these subscriber line test terminals 231a
, 232a are test sui.

It is connected to subscriber line 21L212 through channels 233 and 234.

Subscriber circuit interface device 24 connects subscriber circuit 24
1,242 and backup subscriber circuits 243, 244, and subscriber line test terminals 241a to 241a of these subscriber circuits.
244a are connected in duplicate and are connected to the input side of the test circuit selection switch 26 via the subscriber circuit test line 28. Furthermore, the subscriber line side terminals 243 b and 244 b of the backup subscriber circuits 243 and 244 are connected to the output side of the test circuit selection switch 26 .

For example, if the subscriber circuit 231 fails, it is switched to a backup subscriber circuit as follows.

Various tests for each subscriber circuit are performed during the process of incoming or outgoing connection to the subscriber, and failures in the subscriber circuit 231 are discovered through these tests. If a failure is found, the maintenance person issues a command to, for example, supplement the vacant spare subscriber circuit 244, or replace the test switch 23.
Turn on 3. On the other hand, the test circuit selection switch 26 is connected to the subscriber circuit test line 27 on the input side and the connection line to the backup subscriber circuit 244 on the output side. As a result, a connection path from subscriber A to the test switch 233 of the subscriber circuit 231 to the subscriber circuit test line 27 to the test circuit selection switch 26 to the backup subscriber circuit 244 is formed. Also,
The station data for subscriber A is transferred from the subscriber circuit 231 to the backup subscriber circuit 244, and the backup subscriber circuit 244 controls outgoing connection processing from subscriber A or incoming connection processing to subscriber A. It is done by

[Problem that the invention seeks to solve]

As described above, in a digital electronic exchange using a conventional subscriber circuit interface device, switching to a backup subscriber circuit is performed using a test circuit selection switch.

Therefore, this switch needs to have the same number of output terminals as the backup subscriber circuits, which increases the cost.

Further, when adding a spare subscriber circuit due to an increase in the number of subscribers, etc., the addition becomes difficult if there are insufficient output terminals of the switch.

Furthermore, if this switch is configured with an electronic switch, a compensation circuit must be provided because a voltage drop occurs due to the electronic switch.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a subscriber circuit interface device that solves these problems, is economical, and can easily accommodate the addition of backup subscriber circuits.

[Means for solving problems]

The present invention provides a subscriber circuit interface of a digital electronic exchange that is provided with a subscriber circuit and a spare subscriber circuit that connect subscriber line test terminals in duplicate and connect to the subscriber circuit test line. The apparatus is characterized in that the subscriber circuit and the backup subscriber circuit each include a subscriber line lead-in switch, and a subscriber line side terminal of the backup subscriber circuit is connected to the subscriber circuit test line.

〔Example〕

Next, one embodiment of the present invention will be described. FIG. 1 shows a block diagram of this embodiment. This subscriber circuit interface device 10 includes subscriber circuits 101 and 102 as a plurality of subscriber circuits of different subscriber types, and also includes backup subscriber circuits 103 and 104 as backup subscriber circuits.
It is equipped with Subscribers A, B and subscriber circuits 101, 10
2 are connected by subscriber lines 11 and 12, respectively.

Each subscriber circuit 101, 102 and each backup subscriber circuit 1
A subscriber line lead-in switch (hereinafter referred to as a lead-in switch) 10 is installed on the subscriber line side of 03 and 104, respectively.
5 to 108 are provided. In addition, the subscriber line test terminals 101a to 104a of each subscriber circuit are all connected in multiple ways,
It is connected to various test circuits via the subscriber circuit test line 13. The subscriber line side terminals 103 b and 104 b of the backup subscriber circuits 103 and 104 are connected to the subscriber circuit test line 1.
Connect to 3.

Each subscriber circuit is provided with subscriber line test switches (hereinafter referred to as test switches) 109 to 112, and the subscriber line and subscriber line test terminals 101 a to 101 are connected to each other via these.
104a, respectively.

In normal operating conditions, the pull-in switches 107 and 108 of the backup subscriber circuits 103 and 104 are turned off, and when the subscriber circuits 101 and 102 are in an idle state for call processing, the test switches 109 and 110 are turned off and pulled-in. Switches 105 and 106 are turned on.

For example, if subscriber circuit 101 fails, it is switched to a spare subscriber circuit as follows. Various tests for each subscriber circuit are performed during the process of incoming or outgoing connection to the subscriber.
Failures are discovered through this test. When a failure is found, the maintenance person issues a command to turn off the lead-in switch 105 of the subscriber circuit 101 and turn on the test switch 109, while, for example, supplementing the vacant spare subscriber circuit 103 and turns on the lead-in switch 107. , the test switch 111 is turned off. As a result, subscriber A - subscriber circuit 101 test switch 109 - subscriber circuit test line 13 - lead-in switch 107 - standby subscriber circuit 103
A connection path called internal is formed. Further, the station data for subscriber A is transferred from the subscriber circuit 101 to the backup subscriber circuit 1.
03, and the subscriber circuit device number is changed to the number of the backup subscriber circuit device.

When subscriber A makes a call in this state, the loop of subscriber A is detected by the backup subscriber circuit 103 through the route.

Since the station data has already been transferred to the backup subscriber circuit 103 as described above, call processing proceeds while checking against the station data, and an outgoing connection is established.

Further, when performing a line test for subscriber A in response to a request from the test circuit, the test switch 111 of the backup subscriber circuit 103 is turned on, but the subscriber circuit test line 13 - test switch 109 - subscriber A Various tests can be conducted through these routes.

The case where the subscriber circuit 101 connected to subscriber A and the backup subscriber circuit 103 are switched has been described above.
Switching can be performed in the same manner in the case of the subscriber circuit 102 connected to subscriber B and the backup subscriber circuit 104.

〔Effect of the invention〕

As explained above, in the subscriber circuit interface device of the present invention, the subscriber circuit and the backup subscriber circuit are each provided with a subscriber line lead-in switch, and the line test terminals of the subscriber circuit and the backup subscriber circuit are all dual-type. The subscriber circuit test line is connected to the subscriber circuit test line, and the subscriber circuit test line is further connected to the subscriber line side terminal of each backup subscriber circuit.

As a result, it is possible to switch to the backup subscriber circuit without using a test circuit selection switch, and there is no need to control this switch, which is advantageous in terms of economy. Furthermore, even if the number of subscribers and the number of subscriber types increases, it can be easily handled.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of a digital electronic exchange using a conventional subscriber circuit interface device. 10... Subscriber circuit interface device IL 12... Subscriber line

Claims (1)

[Claims] (1) A subscriber circuit interface device for a digital electronic exchange that is equipped with a subscriber circuit and a spare subscriber circuit that connect subscriber line test terminals in duplicate and connect to the subscriber circuit test line, and that connects to the subscriber line. In the subscriber circuit, the subscriber circuit and the backup subscriber circuit are provided with a subscriber line lead-in switch, and a subscriber line side terminal of the backup subscriber circuit is connected to the subscriber circuit test line. Interface device.