JPS63209238A - System for supervising stuff multiplexing device - Google Patents

Abstract

PURPOSE:To reduce the scale of a supervisory circuit and to improve reliability by adding a bit of parity information to a stuff pulse in a multiplexing format and checking a parity bit. CONSTITUTION:Stuffing is executed by the 'misalignment' of a phase difference and a stuff pulse is inserted in accordance with a high-order group multiplexing format. The stuff pulse is used as a parity bit, the number of marks of the data bit until the stuff pulse is inserted is counted, and in the case of an even number, '1' is inserted as the parity bit or '0' is inserted. Respective low-order group signals count the number of marks in parity checking circuits 81, 82-8n, check an even parity or an odd parity and obtain the matching with the parity bit. Here, when a hard fault exists, the matching cannot be obtained and the can be discovered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a system for monitoring equipment failures in stuff multiplexing equipment used in digital communication systems, and in particular to a system for monitoring equipment failures in stuff multiplexing equipment used in digital communication systems, and in particular, for monitoring equipment failures without changing the entire approved frame format. ,
The present invention relates to a method for monitoring a stuff multiplexing device that allows monitoring to be performed without affecting its characteristics.

[Conventional technology]

An example of a conventional monitoring method for a stuff multiplexer is shown in FIG. 2 and will be described.

In the figure %11,1! ...1n is an input terminal to which a low-order group input signal is applied, 21 p 21 ...2n
3 is a stuffing circuit, 3 is a multiplexing circuit, 4 is a separation circuit, 5.
.

5, . . . 5n is a destuffing circuit, a, 6. ...
- 6n is a comparison circuit, and T is an output terminal from which a high-order group output signal is obtained.

After multiplexing in the input signal full multiplexing circuit 3, the multiplexed signal is demodulated again to the original input signal and compared with the input signal in the comparison circuits 61 to 6n to check whether there is any difference. The process to be performed is configured as follows.

[Problem that the invention seeks to solve]

In the conventional stuff multiplexer monitoring method described above, the amount of hardware is about the same scale as the main signal multiplexing circuit, so the cost is high, the mounting space is large, and the reliability of the monitoring circuit is low. There was a problem that it deteriorated.

[Means for solving problems]

The stuff multiplexer monitoring method of the present invention adds parity information to the stap pulse on the frame format of the stuff multiplexer, and monitors the parity bit so that hardware failures in the equipment itself can be diagnosed. This is what I did.

[For production]

In the present invention, parity information is added to the stuff pulse in the multiplex format, and all failures in the hardware of the multiplex circuit are monitored by checking the parity bit. Examples of the invention will be described in detail.

FIG. 1 is a block diagram showing an embodiment of a monitoring method for a stuff multiplexer according to the present invention.

In Fig. 1, the same reference numerals as in Fig. 2 indicate corresponding parts, and 8Hp B! ...8n is a parity check circuit.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

First, the low-order group input signals applied to the input terminals 1, . ~2nK E-synchronization is performed, at which time E-stuff ink is performed for a phase difference of 1, and stuff pulses are inserted according to the higher-order group multiplexing format. Since this stuff pulse is erased in the receiving side device, the mark signal %l_l and space signal %01 of that bit need not be defined.

Therefore, this stuff pulse is used as a parity bit, the number of data bit marks is counted until the stuff pulse is inserted, and if the number is even, *I ft' is inserted as a parity bit (odd parity method), or 10' is inserted. I decided to insert it (even high IJ tee method).

Next, the signals Lv-multiplexed into the multiplexing circuit 3 in this way are sent out from this device, but on the other hand, a part is branched to the monitoring system, is inversely F-transformed to the separation circuit 4, and is converted into a low-order group. Separated into signals. Here, each low-order group signal is processed by a parity check circuit 8. ．． 8. ~8n, the number of marks is counted, even parity or odd parity is checked, and consistency with the validity bit is determined. Here, if there is a hardware failure (hardware failure), the consistency will be lost and the failure can be discovered.

〔Effect of the invention〕

As explained above, the present invention is a method for monitoring hardware failures in a multiplexing circuit by adding all parity information to stuff pulses in a multiplexed format and checking the parity bit. This has the effect of reducing the scale of the circuit and improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a monitoring method for a stuff multiplexer according to the present invention, and FIG. 2 is a block diagram showing an example of a monitoring method for a conventional stuff multiplexer. 21-2n...stuff circuit, 3...multiplexing circuit, 4...separation circuit, 8. ~8n...Parity check circuit.

Claims (1)

[Claims] A monitoring method for a stuff multiplexer, characterized in that parity information is added to the stuff pulse on the frame format of the stuff multiplexer, and by monitoring the parity bit, it is possible to diagnose hardware failures in the stuff multiplexer itself. .