JPS61141246A - Channel continuity test method - Google Patents

Abstract

PURPOSE:To decrease the amount of hardware and to attain a complete fault bracketing test by making frame phases of signals transmitted to an incoming channel and an outgoing channel of a time division electronic exchange equal so as to apply loopback to the outgoing channel to the incoming channel. CONSTITUTION:The channel equipment A consists of an incoming channel equipment AU and an outgoing channel equipment AD, and a channel equipment B consists of an incoming channel equipment BU and an outgoing channel equip ment BD. An output signal of a pattern generator PG generating a continuity test signal is fed to a pattern checker PC via the equipment BD, the channel 10, the equipment AD, the channel 11, the equipment AU, the channel 12 and the equipment BU. Further, a channel 13 reflecting a test signal on the way of the channel 10 and returning it to the equipment BU is provided. The equip ment BU is provided with a selector 2 switching a signal from the channel 12 or 13 and inputting it to the checker PC. The frame phase of the signal transmitted through the channels 10, 12 are made equal by using an interface IF between the equipments AU and BU and an IF between the equipments AD, BD, the test signal from the PG is switched by the selector 2 at the occurrence of a fault to locate the fault to the incoming and outgoing channels.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a communication path continuity test method for a time-division electronic exchange, and more particularly to a communication path continuity test method suitable for fault isolation IK of a communication path device.

[Background of the invention]

A conventional communication line continuity test method will be explained with reference to TGS diagrams.

Two channel devices A and B are shown in FIG. 3, and each channel device A and B is an upstream channel device Aσ and Bσ
and downlink route survey equipment AD, BD. The data signal sent from the terminal device A is transmitted to the uplink channel devices Aa, Brr and the downlink channel device BD-
A! The data is transmitted to the terminal device B through the terminal B. In addition, each of the conventional communication path devices A and B has a communication path return function within the device, and the test signal from the pattern generator circle is returned within the communication path device B.
Alternatively, the test signal is returned at the input of the communication path device and the returned test signal is inspected by the pattern checker PC. Note that numerals 1 and 2 indicate a phase matching circuit and a selector, respectively.

This conventional test method has the disadvantage that the amount of hardware is large because the test signal is returned by a return mechanism constituted by a shift register, memory, etc. provided in the communication path device. Furthermore, even if, for example, a folded continuity test is performed in device B and the result is ``OK'', and a folded continuity test is conducted in device A and the result is ``NG'', the result will be 100%.
There is a problem in that it cannot be determined that a failure has occurred in device A with a probability of . That is, for example, if a failure occurs in the hardware that exists between the return point P in the B device and the output point Q from the B device to the communication path, this cannot be detected.

As described above, conventional testing methods have the disadvantage that they require a large amount of hardware and cannot completely isolate faults.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a communication line continuity test method that requires only a small amount of hardware and can completely isolate faults.

[Summary of the invention]

In the present invention, the frame phases of the signals propagating on the uplink channel and the downlink channel between communication channel devices are made equal, and the signals propagating on the downlink channel are looped back to the uplink channel. Then conduct a continuity test on the communication path equipment located within the turnaround section.

In this way, since there is no need to provide a loopback function within the communication path device, the amount of hardware is reduced accordingly, and since the signal is looped back outside the communication path device, failures can be isolated. Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a connection configuration diagram of an embodiment of a communication path device to which the communication path continuity testing method according to the present invention is applied.

The communication channel device is composed of an upstream channel device AI7 and a downstream channel device AD, and the channel device B is composed of an upstream channel device B and a downstream channel device BD. has been done.

The output signal of the pattern generator that generates the test signal for the continuity test is transmitted to the downlink channel equipment BDe channel 10.
Downlink channel device AD1 channel 11. Uplink channel equipment AV9 channel 12. The trap is configured so that it is sent to the pattern checker PC via the uplink channel device Bυ.

Furthermore, a communication path 13 is provided which loops back the test signal from the middle of the communication path 10 and returns it to the upstream survey channel device BU.

A selector 2 is provided in the uplink channel device Bv for switching the signal from the channel 12 or 13 and inputting the signal to the pattern checker PCK.

The inter-device interfaces (not shown) of the uplink channel devices AU and B(l) and the device interfaces (not shown) of the downlink channel devices AD-BD allow the signals propagating on the communication path 10.12 between each device to be The frame phases are made equal, for example, as shown in FIG.

In the signal (communication path data) shown in FIG. 2, one frame consists of 52 time slots, and each time slot consists of 8 bits. And upstream channel device A
Time slot zero (TS
o) and the time slot 0 (
The position of the first bit 0 in TSO) is set equal to the position of the first bit 0 in TSO). In this way, making the frame phases equal can be easily achieved in an electronic exchange that employs a time division system.

If a fault occurs and it is necessary to isolate the fault between the communication path device and the communication path device B, a frame signal (Figure 2)
Switch selector 2 in synchronization with , return the test signal from the pattern generator only in a specific time slot, and perform a continuity test on the route PG-+BD-4Bσ→PC. Uplink channel data from the channel equipment person,
Since both phases of the downlink clear channel data from communication path device B are equal, switching by selector 2 is possible, and if the result is "■", it is determined that there is a communication path failure in the communication path device. I can judge.

If the continuity test result is "NG", it can be determined that the communication path device B is at fault, and if a communication path failure occurs after this communication path device B is replaced, it is determined that the communication path device person is also at fault. can.

〔Effect of the invention〕

According to the present invention, since it is possible to isolate the damage to the communication path device when a failure occurs, it is possible to improve the maintainability of the time division electronic exchange. In addition, since the loop is looped between the communication path devices rather than within the communication path device, the number of hardware parts is reduced compared to the conventional method, and economical efficiency is also improved.

[Brief explanation of the drawing]

FIG. 1 is a connection configuration diagram of an embodiment of a communication path device to which the communication path continuity test method according to the present invention is applied; FIG. 2 is a phase diagram of communication path data illustrating an embodiment of the method of the present invention; The figure is a connection configuration diagram of a communication line device for explaining a conventional communication line continuity test method. Ag + Bg... Upward survey channel device A3), BD.
・・Downstream channel equipment A, B・・Terminal device PG・・・Pattern generator PC・・Pattern checker・・Phase matching circuit 2・・Selector

Claims (1)

[Claims] In a time-sharing electronic exchange equipped with a plurality of communication path devices,
The frame phases of the respective signals propagating on the uplink communication path and the downlink communication path between communication path devices are made equal, and the signals propagating on the downlink communication path are looped back to the uplink communication path so that the signals remain within the folding section. 1. A communication path continuity test method characterized by conducting a continuity test of a communication path device.