JPH0537486A - Line quality monitoring system - Google Patents

Abstract

PURPOSE:To transmit the exact line quality information of reception to a counter station and to monitor the line quality of transmission at the own station equipment. CONSTITUTION:When a receiving DS3 signal S7 is received by a separator circuit 2 and a frame having error is detected, an own station multiplexer 1 transmits a detecting signal pulse to a counter 3 and executes counting-up. This total count value is outputted to a coder 5 by a trigger from a monitor timer clock generating circuit 4, turned to a binary code and outputted to a multiplexer circuit 6, and a transmitting DS3 signal S8 inserted to the C-bit of a transmitting signal frame is transmitted to a counter station multiplexer 11. At the counter station multiplexer 11, quality monitor information made into the binary code is extracted from the C-bit of the transmitting DS3 signal S8 received by the separator circuit 12, and the quality of a transmission line is monitored.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the North American Hierarchy D
A line quality monitoring method that is used in a transmission device having an S3 signal interface to transmit the line quality information at the time of reception to the opposite station when monitoring the line quality and at the same time monitor the line quality at the time of transmission by the local device Regarding

[0002]

2. Description of the Related Art Conventionally, in a transmission apparatus provided with a North American Hierarchy DS3 signal (44.736 Mb / s) interface, a frame stuff control bit (C -Bi
t) is used to transmit the line quality monitoring information at the time of reception from the opposite station via the transmission line. In this case, while the received signal containing the erroneous frame is being received, the transmission D
The C-bit of the frame of the S3 signal is set and the line quality information is transmitted to the opposite station.

[0003]

By the way, in such a conventional line quality monitoring system, the transmission signal and the reception signal are not synchronized. Therefore, the number of erroneous reception frames and the number of transmission frames in which the C-bit is set are different, and a difference occurs between the quality monitoring information of the own station and the information obtained by other stations. However, there was a drawback that it was not possible to monitor the line quality accurately.

The first object of the present invention is to provide the opposite station with
An object of the present invention is to provide a line quality monitoring method capable of transmitting quality information at the time of accurate reception.

A second object of the present invention is to provide a line quality monitoring system capable of accurately monitoring the quality of a transmission line of a local station device.

[0006]

SUMMARY OF THE INVENTION In order to achieve the first object, the line quality monitoring system of the present invention uses a transmission DS from its own station.
In the line quality monitoring method of transmitting the line quality information at the time of reception to the opposite station by using the stuff control bits of the frame of the three signals, the self station is
Counting means for obtaining a count value of the number of error frames in the received signal, coding means for converting the obtained count value into a binary code, and count value of the binary coded error frame number Is inserted into the stuff control bit in the transmission DS3 signal and is transmitted.

Further, in order to achieve the second object, in addition to the above-mentioned structure, the opposite station is provided with a transmission DS from the transmission means.
2 from the stuff control bit of the 3 signal frame
It is provided with a separation monitoring information transmitting means for extracting the quality monitoring information coded into a base number and obtaining the quality monitoring information for the transmission line.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the line quality monitoring system of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of the embodiment, which is an example applied to an asynchronous digital multiplexer having a DS3 signal interface on the high-speed line side.

In this example, the reception station information is output, and the transmission information is input. The own station multiplexer 1 and the opposite station multiplexer 1
1 is provided.

The local station multiplexer 1 receives the transmission information, detects the error frame and outputs the detection signal pulse to the separation circuit 2, and counts up the detection signal pulse, and the count value is triggered. A counter 3 is provided for outputting. Further, in the own station multiplexer 1, a monitor timer clock generating circuit 4 for transmitting a trigger, a coder 5 for converting the count value into a binary code, and an error frame converted into a binary code are transmitted. There is provided a multiplexing circuit 6 which is inserted into the C-bit of the frame and is sent out as a transmission DS3 signal S8.

The opposite station multiplexer 11 is also the own station multiplexer 1.
It has the same configuration as that of the above, and is provided with a separation circuit 12, a counter 13, a monitor timer clock generation circuit 14, a coder 15, and a multiplexing circuit 16.

The operation of this configuration will be described below.

The own station multiplexer 1 is the opposite station multiplexer 1
The received DS3 signal S7 from 1 is received by the separation circuit 2.
When the separating circuit 2 detects an erroneous frame, it sends a detection signal pulse to the counter 3.

The counter 3 counts up when a detection signal pulse is input, and outputs a count value at that time to the coder 5 by a trigger from the monitor timer clock generation circuit 4.

The coder 5 converts the count value into a binary code and outputs it to the multiplexing circuit 6, which inserts it into the C-bit of the transmission signal frame and outputs it as the transmission DS3 signal S8. It is sent to the opposite station multiplexer 11. The opposite station multiplexer 11 separates the transmission DS3 signal S8 from the demultiplexing circuit 1
2 is received and the binary coded quality monitoring information is extracted from the C-bit of the transmitted DS3 signal S8. As a result of this extraction, the opposite station multiplexing device 11 sends its own D
The quality of the line transmitting the S3 signal S8 is monitored.

Similarly, in the own station multiplexer 1, the demultiplexing circuit 12 and the counter 1 of the opposite station multiplexer 11 are also provided.
3, monitor timer clock generation circuit 14, coder 15
By the operation through the and multiplex circuit 16, it is possible to monitor the quality of the line transmitted by the local station device.

[0018]

As is apparent from the above description, the line quality monitoring system of the present invention corresponds to the first object and determines the number of error frames in a received signal for every predetermined basic unit time. Since it is counted, converted into a binary code, and inserted into the C-bit of the frame of the transmission DS3 signal for transmission,
The effect is that the line quality information at the time of reception can be accurately transmitted to the opposite station.

Further corresponding to the second purpose, the opposite station is
Since the quality monitoring information of the transmission line is obtained by extracting the quality monitoring information coded from the C-bit of the transmission DS3 signal from the transmission means, the quality monitoring of the transmission line of the own station device can be accurately performed. Has the effect.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a line quality monitoring system of the present invention.

[Explanation of symbols]

1 Local station multiplexer 2 separation circuit 3 counter 4 Monitor timer clock generation circuit 5 coder 6 multiple circuits 11 Opposite station multiplexer S7 reception DS3 signal S8 transmission DS3 signal

Claims (2)

[Claims] 1. A line quality monitoring system for transmitting line quality information at the time of reception to an opposite station by using a stuff control bit of a frame of a DS3 signal transmitted from the own station, wherein the own station is a predetermined base. Counting means for obtaining a count value of the number of error frames in the received signal for each unit time, coding means for converting the obtained count value into a binary code, and the binary coded above. A line quality monitoring system comprising: a transmission means for inserting a count value of the number of error frames into a stuff control bit in the transmission DS3 signal for transmission. 2. A line quality monitoring method for monitoring line quality at an opposite station that has transmitted line quality information at the time of reception by using a stuff control bit of a frame of a DS3 signal transmitted from the own station. Is a counting means for obtaining a count value of the number of error frames in a received signal transmitted from another station for every predetermined basic unit time, and a coding for converting the obtained count value into a binary code. Means, transmission means for inserting the binary coded count value of the error frame number into the stuff control bit in the transmission DS3 signal for transmission, and the opposite station for transmitting from the transmission means. Separation monitoring information transmitting means for extracting the quality monitoring information coded in binary from the stuff control bit of the frame of the DS3 signal to obtain the quality monitoring information of the transmission line. Line quality monitoring system which is characterized the door.