JP2962064B2 - Separate multiplex system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a demultiplexing multiplex system, and more particularly to
DH (Synchronous Digital Hi)
SOH (Section Overhead) used as a transmission line for network management of an error
The present invention relates to a system for separating and multiplexing bytes.

[0002]

2. Description of the Related Art Conventionally, in this kind of demultiplexing multiplex system, as shown in FIG.
TM-N (Synchronous Transport)
tModule-N) SOH is separated from 101
The overhead data 102 and the clock 103 are output from the H separation circuit 1 to the line monitoring circuit 5.

The line monitoring circuit 5 receives the data 102 and the clock 103 output from the SOH separation circuit 1, terminates the line monitoring information (data 102) sent from the preceding section, and adds its own station information to the line monitoring information. Line monitoring information.

The line monitoring circuit 5 adds new line monitoring information generated by adding the line monitoring information of its own station to the SOH multiplexing circuit 6.
Is output to the SOH multiplexing circuit 6 as data 106 synchronized with the output clock 110 from the SOH. The SOH multiplexing circuit 6 converts the data 106 from the line monitoring circuit 5 into a transmission signal STM-N.
And output to the rear section.

In such a conventional separation multiplex system,
When a device failure occurs in the line monitoring circuit 5, the network management transmission line is disconnected, so that there is a disadvantage that not only the own station but also the network in the forward section cannot be managed.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned drawbacks of the prior art, and is intended to provide a demultiplexing / multiplexing system capable of managing a network other than its own station even if an equipment failure occurs in a line monitoring circuit. For the purpose of providing.

[0007]

A separation multiplexing system according to the present invention separates line monitoring information from a transmission signal, and outputs the line monitoring information of the own station added to the line monitoring information separated by the separating unit. A separation multiplexing system including a line monitoring unit, and a multiplexing unit that multiplexes an output of the line monitoring unit into a transmission signal, wherein the detection unit detects a failure of the line monitoring unit, and responds to a detection result of the detection unit. Means for transmitting the line monitoring information separated by the separating means to one of the line monitoring means and the multiplexing means.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. In the figure, an SOH separation circuit 1 separates an SOH from a transmission signal STM-N101 and outputs overhead data 102 and a clock 103 to an interface circuit 2.

When the interface circuit 2 does not receive the alarm signal 111 from the line monitoring circuit 3, that is, when the line monitoring circuit 3 is in a normal state, the data 102 and the clock 103 from the SOH separating circuit 1 are converted into the data 104 and the clock 105, respectively. The clock 110 from the SOH multiplexing circuit 4 is output to the line monitoring circuit 3 as the clock 107. The interface circuit 2 is a line monitoring circuit 3
Is output to the SOH multiplexing circuit 4 as data 108.

On the other hand, when the interface circuit 2 receives the alarm signal 111 from the line monitoring circuit 3, that is, when an equipment failure occurs in the line monitoring circuit 3, the data 102 and the clock 103 from the SOH separation circuit 1 are transmitted to the data 10.
8 and the clock 109 are output to the SOH multiplexing circuit 4. That is, when an equipment failure occurs in the line monitoring circuit 3, the interface circuit 2 changes the connection destination of the data 102 and the clock 103 from the SOH separating circuit 1 from the line monitoring circuit 3 to the SOH multiplexing circuit 4.

The line monitoring circuit 3 receives the data 102 and the clock 103 from the SOH separation circuit 1, terminates the line monitoring information (data 102) sent from the preceding section, and adds the line monitoring information of its own station to the line monitoring information. Add line monitoring information.

The line monitoring circuit 3 outputs new line monitoring information generated by adding the line monitoring information of its own station to the interface circuit 2 as data 106 synchronized with the clock 107 from the interface circuit 2. The line monitoring circuit 3 is provided with a function of detecting a power failure or various processing abnormalities in its own circuit, and outputs a warning signal 111 to the interface circuit 2 and the SOH multiplexing circuit 4 when a severe equipment failure is detected. .

When the SOH multiplexing circuit 4 does not receive the alarm signal 111 from the line monitoring circuit 3,
Is normal, the data 108 from the interface circuit 2 is multiplexed on the transmission signal STM-N and output to the rear section.

The SOH multiplexing circuit 4 includes a line monitoring circuit 3
When the alarm signal 111 is received, that is, when a device failure occurs in the line monitoring circuit 3, the interface condition of the SOH is changed to the Contra-Dir (Contra-Dir).
section) to Co-Direction (Co-Dir)
action). Thereafter, the SOH multiplexing circuit 4 stops outputting the clock 110, inputs the data 108 and the clock 109 from the interface circuit 2, and multiplexes the data 108 with the transmission signal STM-N and outputs the multiplexed signal to the rear section.

As described above, when the line monitoring circuit 3 causes a device failure, the alarm signal 111 is output.
11, the connection destination of the line monitoring information sent from the preceding section is changed from the line monitoring circuit 3 to the SOH multiplexing circuit 4 by the interface circuit 2, and the interface condition of the SOH multiplexing circuit 4 is changed from the contra direction to the・
By changing to the direction, the line monitoring information up to the section in front of the line monitoring circuit 3 in which the equipment failure has occurred can be transmitted to the rear section. Therefore, even if a device failure occurs in the line monitoring circuit 3, it is possible to manage a network other than the own station.

[0017]

As described above, according to the present invention, when a failure is detected in the line monitoring means for adding the line monitoring information of the own station to the line monitoring information separated from the transmission signal and outputting the same, the transmission is performed. By multiplexing and transmitting the line monitoring information separated from the signal to the transmission signal, it is possible to manage a network other than the own station even if a device failure occurs in the line monitoring circuit.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional example.

[Description of Signs] 1 SOH separation circuit 2 Interface circuit 3 Line monitoring circuit 4 SOH multiplexing circuit

Claims (1)

(57) [Claims] 1. Separating means for separating line monitoring information from a transmission signal, line monitoring means for adding the line monitoring information of its own station to the line monitoring information separated by the separating means, and outputting the line monitoring information, A multiplexing means for multiplexing an output of the means to a transmission signal, wherein the detecting means detects a failure of the line monitoring means, and is separated by the separating means according to a detection result of the detecting means. Means for transmitting line monitoring information to one of the line monitoring means and the multiplexing means.