JPS5854704B2 - Network pseudo fault detection method for electronic exchanges - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting a pseudo failure in a switching network that occurs when a subscriber repeatedly goes on-hook and off-hook.

In conventional electronic exchanges, faults in subscriber lines and networks are detected by inspection means shown in FIG.

That is, when the subscriber SUB takes the handset off-hook, the line relay LR knows this, and the central control unit (not shown) performs a first inspection at point A of the trunk TRK in order to establish a connection with the trunk TRK via the network NW. Operate 5CN1 to check continuity.

The continuity of the path including the subscriber line and the exchange network is checked, but often when this test is started the subscriber SUB goes on-hook, in which case the test returns a non-continuity result.

Therefore, if the inspection at point A of the trunk TRK is repeated several times and the disconnection continues, there is a risk that a failure will occur in the network NW.
Operate CN2.

After disconnecting 8 points on the network side of line relay LR, the continuity state of the subscriber line is checked by looking at the subscriber SUB side.

At this time, if the subscriber SUB remains on-hook, the subscriber line is disconnected, and it can be determined that the subscriber has gone on-hook to abandon the call, but it may go off-hook again following the above-mentioned on-hook, and in that case, the subscriber It is determined that the communication line is in good continuity, and the conclusion is that the fault is within the network NW.

If a subscriber repeats on-hook and off-hook operations in this way unconsciously due to forgetting the dialed number, etc., the timing may coincide with the testing process by the hardware for connecting to the exchange, and a failure may occur. In some cases, maintenance personnel were alerted to the occurrence of a failure even when the system was not installed.

FIG. 2 shows an operation timing chart of FIG. 1.

Time t. goes off-hook for the original subscriber call,
tl is on-hook due to premature abandonment, T1 is the time to create a connection path between the subscriber and the trunk in hardware, t2 is the trunk monitoring relay inspection start time, T2 is the inspection time, t3
is the start time of the second inspection means after disconnecting the network I/work circuit for inspection of the subscriber line, T3 is the hard operation time, t4 is the off-hook time of the subscriber again, and t5 is the subscriber line continuity. @Eclipse start time, T4 indicates the judgment time.

Depending on the subscriber's habits, the period from time tl to t4 is 1 to 1.
In many cases, the time is 2 seconds, and in this case, it is easy to match the operation timing of the inspection means shown in FIG.

The purpose of the present invention is to improve the above-mentioned drawbacks and to:1. An object of the present invention is to provide a method for detecting a pseudo-failure that can continue the switching connection operation when a network pseudo-fault occurs in an exchange.

Examples of the present invention will be described below.

FIG. 3 shows a timing chart in the present invention.

In FIG. 3, the operation up to time t3 is the same as in FIG. 2.

At time t5, the continuity state of the subscriber line is inspected and if it is found to be normal, the connection at point B in FIG. 1 is subsequently made at time t5, and the operation of the first inspection means is performed again at point A.

If the conduction state is normal at that time, it is known that there is no abnormality in the network NW, and that the failure determined at time T2 was a pseudo failure.

Therefore, all you have to do is continue the connection operation at the exchange.
There is no need to issue an alarm when a network failure occurs.

If the first test means fails again in its operation, it is determined that there is a real failure in the network NW.

Note that the time T3 in FIG. 3 refers to the re-inspection judgment time of the first inspection means.

In this way, according to the present invention, even when there is no fault in the exchange network due to unconsciously repeated on-hook/off-hook operations by the subscriber, it is no longer determined that there is a fault.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the connection of inspection means in an electronic exchange, FIG. 2 is an operation timing chart of FIG. 1, and FIG. 3 is an operation timing chart of the present invention. SUB------Subscriber, NW---Network, TRK---Trunk LR------
Line relay SCN...Inspection means.

Claims (1)

[Claims] 1 comprising a first testing means for testing the continuity state of a path including a subscriber line and an exchange network; and a second testing means for testing the continuity state of only the subscriber line;
In the method of detecting a fault in the network by sequentially operating the test means, if the first test means shows poor continuity and the second test means shows normal continuity, then the first test means is sequentially operated. A method for detecting network pseudo faults in an electronic exchange, characterized in that when the switch is activated and continuity is normal, it is assumed to be a network pseudo fault, and the switch connection operation is continued.