JPH04150632A - Signal line monitor - Google Patents

Abstract

PURPOSE:To detect even a fault caused in a pre-stage circuit of a synchronizing signal generating means of a duplicate device by comparing data signals of signal lines in duplicate at a simplex equipment and informing the result of comparison to duplex equipments. CONSTITUTION:A data signal outputted from transmission internal circuits 12A, 12B in duplicate in a transmitter 11 being a duplicate wavelength is added with a synchronizing signal and an act/standby signal by synchronizing signal generating means 13A, 13B, and sent to a receiver 15 being a simplex equipment via respective signal lines 14A, 14B. Then the simplex equipment 15 compares the synchronizing signals and the data signals of the duplicate signal line 14, informs the result of comparison to the duplicate equipment 11, in which a fault is detected. Thus, in the case of a fault of a pre-stage circuit of a synchronizing signal generating means 13, it is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal path monitoring device for a system in which a duplexer and a duplexer are connected.

[Conventional technology]

For example, the internal transmission circuit of a transmitter is duplicated, the signal path is also duplicated, and data is transmitted to a single receiver. The signal monitoring device in such a system independently monitors data on each signal path.

That is, a synchronization signal generation means is provided in the transmitting device corresponding to each duplex transmission internal circuit, and the synchronization signal is used independently in each signal path to check the synchronization of the signal path and the normality of the data. Was. For example, monitoring was performed using checks, CRC checks, etc.

[Problem to be solved by the invention]

However, in the above-mentioned conventional signal path monitoring device, the synchronization of the signal path and the normality of the data are monitored independently in each signal path, but it is difficult to compare the contents of the duplicated data signals. has not been done.

Therefore, even if a fault occurs in the circuit before the synchronization signal generation means in the transmitting device, which is a duplex device, the fault cannot be detected because the synchronization signal is attached to the faulty data. Yes.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a signal path monitoring device that can detect a failure even if it occurs in a circuit preceding a synchronization signal generating means.

[Means to solve the problem]

The signal path monitoring device of the present invention includes synchronization signal generating means for adding a synchronization signal to data signals from each duplexed transmitting internal circuit provided in a transmitting device that is a duplexing device, and a receiving device that is a duplexing device. a synchronization signal monitoring means provided in the device for receiving the data signals to which synchronization signals have been added by the synchronization signal generation means via signal paths and monitoring the synchronization signals; and a fault detection means provided in the duplexing device for diagnosing the duplexed transmission internal circuit when the data signals do not match among the signals received by the means. .

[Effect]

That is, in the signal path monitoring device of the present invention, the duplexer adds a synchronization signal to the data signal, the duplexer compares the synchronization signal and each data signal of the duplexed signal path, and the comparison result is sent to the duplexer. Notify and perform failure detection. Therefore, even if there is a failure in the circuit at the front stage of the synchronization signal generating means, it is possible to detect it.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. The transmitting device 11, which is a duplex device, has transmitting internal circuits 12A, 1
2B is duplicated, each transmitting internal circuit has 12A,
Synchronizing signal generating means 13 for 12B. 13B is provided. That is, the data signals output from the transmitting internal circuits 12A and 12B are transmitted to each synchronizing signal generating means 13.
At A and 13B, a synchronizing signal and ACT/SBY are added, and the signals to which the synchronizing signal is added are sent to the receiving device 15, which is a multiplexing device, via respective signal paths 14A and 14B. Therefore, the transmitting internal circuit 12A
, 12B are the same while the transmitter 11 is normally operating synchronously.

Here, in the present invention, CCITT (International Telegraph and Telephone Consultative Committee) recommendation 0.704 is used as an example of the synchronization signal. Also, the act/standby signal, which is a system selection signal of the duplexing device, is mapped to a specific bit S○ bit of the synchronization signal. Note that the act is a so-called operating system, and indicates the system of the duplex device selected by the duplex device.
Standby means a system on standby, and indicates each system of a duplexing device that is not selected.

Next, the receiving device 15, which is a duplexing device, has − units of receiving internal circuits 16. The signals received via the signal path 14 are received by each synchronization signal monitoring means 17, and the synchronization signal monitoring means 17 monitors the frame synchronization of the signal path 14 and the parity check and CRC check of the data. Determine the health of the signal.

Further, the synchronization signal monitoring means 17 inputs the data signal to the system selection circuit 18 and the speech signal monitoring means 19. When inputting to the system selection circuit 18, the act/standby signal is dropped from the synchronization signal and sent to the system selection circuit 18.

In the system selection circuit 18, the duplicated synchronization signal monitoring means 1
An act data signal is selected based on the act/standby signals received from 7A and 17B, and the selected data signal is sent to the receiving internal circuit 16.
Then, the data signal received from the system selection circuit 18 is processed.

On the other hand, the call signal monitoring means 19 detects the data signals received from the duplicated synchronization signal monitoring means 17A and 17B, respectively, as shown in FIG.
bit) are compared sequentially. Here, Dl
~D31 is a data signal, and F-ch is a synchronization signal. Also, the communication speed of this data signal is 2.048Mb
ps (bits/second), the number of TSs is 32, and the number of bits is 256.

FIG. 3 is an explanatory diagram of the synchronization signal F-ch, and as described above, the act/standby signal is mapped to the So bit. S] bit is CRC (Cycle Redundant)
This is a bit indicating an alarm, which is 0 when there is an error in the check (dancy check), and 1 when there is no error, and Sη is a spare bit. C to C2 are bits for CRC check, and A is a bit for alarm output.

Next, the comparison result by the call signal monitoring means 19 is notified to the failure detection means 21 of the transmitting device 11 via the failure notification signal path 20. During synchronous operation, the failure detection means 21 first considers that a failure has occurred in the standby system, that is, the standby system transmission internal circuit 12B, and disconnects the standby system transmission internal circuit 12B if the comparison result notifications do not match. After that, we will conduct an internal diagnosis. In the event of a diagnostic error, processing such as failure recovery of the standby transmission internal circuit 12B is performed. In addition, if the diagnosis is normal, it is assumed that a failure has occurred in the transmitting internal circuit 12A of the active system, and after switching the system, the transmitting internal circuit 12A of the old act system is diagnosed. System transmitting internal circuit 12
Processing such as failure recovery of B is performed. Also, if the diagnosis of both systems is normal, it will be determined by the maintenance personnel.

〔Effect of the invention〕

As explained above, according to the present invention, each data signal on the duplexed signal path is compared in the duplexing device, and the comparison result is notified to the duplexing device. It is possible to detect failures that occur in the preceding stage circuit.

In addition, the duplexing device is equipped with a fault detection means, and if the comparison results sent from the duplexing device do not match, the internal transmission circuit of the standby system is first diagnosed, and if it is normal, the active system and the standby system are diagnosed. Since the transmission internal circuit that was in operation is diagnosed by switching between systems, the possibility that processing will continue until t of incorrect data is reduced. moreover,
Since fault recovery is also performed for the transmission internal circuit that is determined to be faulty, the reliability of the system is improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the data format of the communication path of the present invention, and FIG. 3 is an explanatory diagram of a synchronization signal. 11... Transmitting device, 12... Transmitting internal circuit, 13... Synchronizing signal generating means, 14...
...Signal path, 5...Receiving device, 16...
7... Synchronization signal monitoring means, 8... System selection circuit, 9... Call signal monitoring means, 0... Fault notification signal path, 1. ... Fault detection means. Receiver internal circuit,

Claims (1)

[Claims] 1. In a signal path monitoring device for a system in which a duplexer and a duplexer are connected, a synchronization signal is added to the data signal from each duplexed transmission internal circuit provided in the duplexer. synchronization signal generating means, and synchronization signal monitoring means provided in the multiplexing device for receiving the data signals to which the synchronization signals have been added by the synchronization signal generation means via signal paths and monitoring the synchronization signals, respectively. and a speech signal monitoring means provided in the duplexing device for monitoring whether the data signals match or do not match among the signals received by the respective synchronization signal monitoring means; and a speech signal monitoring means provided in the duplexing device for monitoring whether the data signals match or do not match among the signals received by the respective synchronization signal monitoring means; 1. A signal path monitoring device comprising a fault detection means for diagnosing a duplex internal transmission circuit. 2. The fault detection means first diagnoses the standby transmitting internal circuit when the data signals do not match, and diagnoses the operating transmitting internal circuit when the standby transmitting internal circuit is normal. 2. The signal path monitoring device according to claim 1, wherein the signal path monitoring device switches to diagnose the transmitting internal circuit while it is in operation. 3. The signal path monitoring device according to claim 1, wherein the failure detection means has a function of performing failure recovery processing when it is determined that there is a failure in the diagnosis.