JPS60206238A - Circuit monitoring system - Google Patents

Abstract

PURPOSE:To monitor a circuit on on-line basis without spoiling the performance of transmission by allocating time slots for monitoring circuit abnormality and a transmission error in a frame, and controlling bits in repeating sections corresponding to them and transmitting them to the next sections. CONSTITUTION:Repeaters 2, 3, and 4 and a slave circuit terminator 5 collates CRC bits C3, frame by frame, to reset the time slot (TS)C2 for transmission error monitoring in case of the occurrence of a transmission error and send it to the next section. Further, the TSC1 for circuit abnormality monitoring is reset in case of an up frame step-out state and sent out to the next section. When a down frame step-out state occurs, frame transmission to the next section is stopped under time-division direction control. A master circuit terminator 1 monitors said TSC1 and TSC2 to monitor circuit abnormality and a transmission error, and the step-out state of a repeater 2 is specified unless an up frame is detected. When the TSCs C1 and C2 are both bits ''1'', the terminator 1 sets the TSC1 and TSC2 to ''1'' and a down frame is sent out to monitor the TSC1 and TSC2 of the up frame, so that the all sections are monitored.

Description

Detailed Description of the Invention Technical Field The present invention relates to a line monitoring method in a system that is configured with two line terminators and a plurality of repeaters and performs communication (i4) using a time division direction control method. Technology> Conventionally, a code conversion method has been commonly used as an example of a method for monitoring an abnormal state of a communication@line.Furthermore, it has been common to monitor transmission errors on a line offline.

The code conversion method described above has the disadvantage that it requires as many codes as there are relay sections in order to specify the data intervals to be transmitted.

<Object of the invention> Therefore, an object of the present invention is to provide a system that does not lose transmission transparency;
Another object of the present invention is to provide a line monitoring method that is capable of specifying a section where a failure occurs.

<Constitution of the Invention> The present invention uses a frame in which a time slot for monitoring line abnormalities and a time slot for monitoring transmission errors are multiplexed into an information time slot, and monitors line abnormalities and transmission errors at repeaters and line terminators. The bits of the relay section in the retrospective abnormality monitoring time slot and the transmission error monitoring time slot are controlled and transmitted to the next relay section.

〈Example 1〉Explanation of an embodiment of the present invention below with reference to Figure 1. Figure 1 is a block diagram of a system to which an embodiment of the present invention is applied, and the case where there are 8 repeaters is explained. It shows all 2 lines (M all lines 7). Figure 2 shows the Q that saves the present invention.
This is an example of a frame format, where F is a frame synchronization pattern, C1 is a time slot for abnormal line acuity, and C
2 is a time slot for transmission error monitoring, C3 is error monitoring 01 is also a C bit% D is a data bit. Theory F Q
+j = 5 units, the frame sent out in the direction of the slave line terminator 5 is the downlink frame, and the frame sent out in the direction of the line terminator l is the uplink frame.

Next, the operation of this embodiment will be explained. The repeater 2.84 and the slave line terminator 5 perform a complete cyclic check on the frame they receive, check it with the 01LO pit C3, and use the transmission error monitoring time slot C when a transmission error occurs.
2 is reset and sent to the next section. Furthermore, when the frame synchronization is completed, the signal occupies the line abnormality monitoring time slot and sends it to the next section. When the downlink frame is out of synchronization, frame transmission to the next section is stopped by 1 time division direction control. The mask line terminator I monitors the occurrence of line abnormalities and transmission errors by monitoring the line abnormality monitoring time slot L and the transmission error monitoring time slot C2. If the upstream frame is not installed on the mask circuit line 4a, repeater 2
It can be determined whether the synchronization is near or not. Time slot C1 for line abnormality monitoring, time slot C for transmission error monitoring
If both of 2 and 2 are 1 bit, the mask line terminator l sends the circuit error 'lδ monitoring time slot 01. Time slots for monitoring transmission errors (4) 02e and 02e are both connected to the town, and the downlink frame is sent out, and time slots for monitoring line abnormalities are set for 7 rays and 7) G! I, it is possible to monitor time slot 02 for error monitoring and to monitor 'C' throughout the entire interval. To identify the section in which a fault has occurred, monitor 1-1 line abnormality''/+, allocate bits only for the relay section to time slot C! for r11, transmission error monitoring time slot C2, and This is done by the slave line terminator 5 resetting only the bits in the relevant section.Also, the time slot KO+ for IgI line abnormality monitoring and the time slot C2 section for transmission error monitoring are made into multiple 7 frames for detection. is also possible.

<Effects of the Invention> The present invention allocates time slots for monitoring line abnormalities and transmission errors in a frame, performs 1LKI elJ on the bits of the relevant relay section of these monitoring time slots, and transmits them to the next relay section. As a result, it is possible to perform online/monitoring of communication lines without losing transmission transparency, and it is also possible to identify between IKs where a failure has occurred.

[Brief explanation of the drawing]

No. 1- is a block diagram of a system to which an embodiment of the present invention is applied; No. 213! J is a diagram showing an example of a frame format for implementing the present invention. l: Mask episode #l! Terminator, 2. δ, 4. Repeater. 5 = slave line terminator, F: 7 slave line synchronization pattern. C is a time slot for line abnormality monitoring. C2: Transmission error monitoring time slot Os: 01LC bit, D: Data bit.

Claims (1)

[Claims] Consists of two line terminators and multiple repeaters,
In a system that performs communication using a time-division direction control method, repeaters 4 and line terminators detect line abnormalities and A line monitoring system characterized by monitoring transmission errors, performing ftNJ'jR of the pits in the section in the line abnormality monitoring time slot and the transmission error monitoring time slot, and transmitting the results to the next repeating section.