JPH0520020B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a communication line continuity test method for a time-division electronic exchange, and particularly to a communication line continuity test method suitable for isolating faults in communication line equipment.

[Background of the invention]

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

In FIG. 3, two channel devices A and B are shown, and each channel device A, B is composed of an upstream channel device A _U , B _U and a downstream channel device A _D , B _D , respectively. It is made up of. The data signal sent from the terminal device A is transmitted to the terminal device B through the upstream channel devices A _U and _BU and the downstream channel devices B _{D and AD} . . In addition, each of the conventional communication path devices A and B has a call path return function within the device, and the test number from the pattern generator PG is looped back within the communication path device B, and also within the communication path device A. The pattern checker PC returns the returned test signal. 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, for example, even if a loop continuity test is performed in device B and the result is "OK," and a loop continuity test is performed in device A and the result is "NG," there is a 100% probability that the fault is in device A. There is a problem in that it cannot be determined that it is occurring internally. 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 path continuity test method that reduces the amount of hardware and makes it possible to completely isolate faults.

[Summary of the invention]

In the present invention, the frame phases of the respective signals propagating on the uplink path and the downlink path between the communication path devices are made equal, and the signals propagating in the downlink path are looped back to the uplink path and within the folding section. Perform a continuity test on existing communication line equipment.

In this way, there is no need to provide a return function within the communication path device, so the amount of hardware is reduced accordingly.
Since the signal is looped back outside the communication path device, it becomes possible to isolate the fault.

[Embodiments of the invention]

An embodiment of the present invention will be described below 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 channel device A is composed of an upstream channel device A _U and a downstream channel device A _D , and the channel device B is composed of an upstream channel device B _U and a downstream channel device B _D. ing. The output signal of the pattern generator PG that generates the test signal for the continuity test is transmitted to the downstream channel device _D , the channel 10, and the downstream channel device.
The data is sent to the pattern checker PC via A _D , the communication path 11, the upstream communication path device _AU , the communication path 12, and the upstream communication path device _BU . Also,
A communication path 13 is provided for returning the test signal from the middle of the communication path 10 and returning it to the upstream communication path device _BU . In the upstream communication path device B _U , there is a communication path 12.
Alternatively, a selector 2 is provided for switching the signal from the communication path 13 and inputting the signal to the pattern checker PC.

Inter-device interface (not shown) of upstream communication path devices A _U and B _U and downstream communication path devices A _D and B _D
The frame phases of the signals propagating through the communication paths 10 and 12 between the respective devices are made equal, for example, as shown in FIG. 2, by an interface of a device (not shown).

In the signal (communication path data) shown in FIG. 2, one frame consists of 32 time slots, and each time slot consists of 8 bits. and,
The position of the first bit 0 at time slot zero (TS0) of the communication path data between the upstream communication path devices A _U and B _U and the time slot zero of the communication path data between the downstream communication path devices B _D and _{A D.} The position of the first bit 0 in (TS0) is made equal. In this way, making the frame phases equal can be easily achieved in an electronic exchange that employs a time division system.

When a fault occurs and it is necessary to isolate the fault between channel device A and channel device B, selector 2 is switched in synchronization with the frame signal (Figure 2) to identify the test signal from pattern generator PG. Only the time slot of PG → B _D →
Perform a continuity test on the route B _U → PC. Uplink channel data from channel device A and channel device B
Since both phases of the downstream communication path data from the communication path device A are equal, switching by the selector 2 is possible, and if the result is "OK", it can be determined that there is a communication path failure in the communication path device A. 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 A 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 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. 3 is a phase diagram of channel data for explaining an embodiment of the method of the present invention, and FIG. 3 is a connection configuration diagram of a channel device for explaining a conventional channel continuity testing method. A _U , B _U ... Uplink communication path equipment, A _D , B _D ... Downlink communication path equipment, Party A, Party B... Terminal equipment, PG...
Pattern generator, PC...Pattern checker, 1...Phase matching circuit, 2...Selector, 1
0, 11, 12, 13...Call path.

Claims (1)

[Claims] 1 in a time division electronic exchange, first and second uplink channel devices, first and second downlink channel devices, and coupled to the first downlink channel device;
a signal generating device that generates a test signal for a continuity test; a first channel that guides the signal of the signal generating device to the second downstream channel device via the first downstream channel device; , the signal on the first communication path guided to the second downstream communication path device is transmitted to the first communication path device.
a second communication path leading to the upstream communication path device; and a third channel guiding the signal of the second communication path guided to the first upstream communication path device to the second upstream communication path device. a fourth communication path that guides the signal of the first communication path to the second upstream communication path device;
provided in the second upstream communication path device, receiving signals from the third and fourth communication paths;
a cell selector for selecting a signal on a communication path; and means for guiding the signal selected by the selector to a checking device; A communication path continuity testing method characterized in that the signal on the first communication path is returned to the check device via the selector, and the communication path existing within the return section is tested.