Description of the problem

The customer opens to test the external loopback function of the SLQ16 single board of Huawei OSN3500 device:

Scenario 1: SSN1SLQ16 single board connects to the meter first and then loops back externally, los disappears, no alarms on the meter

SSN4SLQ16 single board connects to the meter first and then loops back out, los disappears, and the meter has no alarm.

Scenario 2: SSN1SLQ16 board connects to the meter first and then connects to the external loopback, los disappears, no alarm on the meter.

SSN4SLQ16 single board connects to the meter first, then connects to the meter again, los disappears, the meter reports HPUNEQ alarm.

OSN3500 device version is 5.21.18.44, SSN4SLQ16 version is 7.85, SSN1SLQ16 version is 7.16.

Alarm information

HP_UNEQ

Processing

1. 10PCS SSN4SLQ16 purchased by the customer all have this problem, to rule out a single single board failure.

2、After R&D confirmed that it is caused by hardware defects. This problem can be avoided by connecting the meter before loopback or by pre-configuring the services on SSN4SLQ16.

When the SSN4SLQ16 board is configured with the service, loopback first and then connect the meter, after the los disappears, there is no alarm on the meter.

3. R&D plans to release R10 version at the end of June 2011 to solve this problem.

Root Cause

1. Veneer failure

2、Software problem

Suggestions and Summary

SSN1SLQ16 veneer is discontinued, customer needs to purchase SSN4SLQ16 veneer instead.

This issue has no effect on the operation of the existing network, only need to inform the customer to pay attention to it during the test.

The related technical information and SDH equipment troubleshooting procedures in this chapter are collected and organized by Shenzhen Optical Transmission Network Technology Company Limited (www.opticaltrans.com), please retain! Our company specializes in the sale of Huawei SDH optical transmission equipment,SDH transmission equipment.