Description of the problem

A bureau reports an error in configuring one-way broadcast service, prompting: cross-connection source time slot conflict, error code: 38746.

Process

Troubleshooting steps.

1, suspected network element data and network management data is not synchronized, remote guidance after uploading network element data is not resolved.

2、Return to the cross-connection configuration error interface, check the business occupancy situation to determine whether the time slot conflict.

3、Return to the operation log, network element database to analyze whether the data is abnormal.

Return to cross-configuration screenshot.

Requirement: Configure a unidirectional VC4-64C service from port 1 of slot 6 to port 1 of slot 8. Checking the configured services, we find that there are already 64 unidirectional VC4-64C services from port 1 of slot 6 to port 1 of slot 16, so there is a time slot conflict in the report.

Root Cause

For NGSDH equipment unidirectional broadcast service characteristics.

Receiving direction.

Each time slot can be configured only once for the host time slot.

Outgoing Direction.

If A sends B to VC4 level, then A then sends C must also use VC4 level (or VC4 can pass through the level of business, such as VC12/VC3), can not use VC-64C, otherwise it will be reported as a time slot conflict, that is, the trigger cause of this problem. The same applies to other levels of service.

After A configures the VC4 level service in the sending direction, if the A host direction has not yet configured the service, then the A host direction can configure other level services such as VC4-64C or VC12, which are not subject to the limitation of the service level in the A sending direction. For example, the VC12 level service in the first line of the screenshot in the description of the processing above can still be configured to go from 7-slot-1 to 16-slot-1 after configuring the unidirectional VC4 level service from 6-slot-1 port to 16-slot-1 port in the second line. After configuring the one-way VC4 level service from slot 6 port 1 to slot 16 port 1 in the second row, the VC12 level service from slot 7 port 1 to slot 6 port 1 can still be configured.

Solution

Modifying the cross-connect can be configured properly.

Recommendations and Summary

Understand the cross-cutting nature of unidirectional services and configure them correctly.

NGSDH equipment one-way broadcast service characteristics.

Receiving direction.

Each time slot can be configured only once for the host time slot.

Outgoing Direction.

If A sends B to VC4 level, then A then sends C must also use VC4 level (or VC4 can be transmitted to the level of business, such as VC12/VC3), can not use VC-64C, otherwise it will be reported as a time slot conflict, that is, the trigger cause of this problem. Other levels of business is the same.

After A configures the VC4 level service in the sending direction, if the host in the A host direction has not yet configured the service, then the A host direction can configure other levels of service such as VC4-64C or VC12, and is not subject to the restrictions on the service level in the A sending direction.

Failure to understand the characteristics of the sending and receiving directions may lead to human misjudgment that the time slot is not used but the service cannot be configured, resulting in misdirection of the problem processing to the network element database.

The technical information and SDH equipment troubleshooting procedures in this chapter are provided by Shenzhen Optical Transmission Network Technology Company Limited ( www.opticaltrans.com), please retain! Huawei SDH Optical Transmission Equipment,SDH Transmission Equipment Sales