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OSN3500 causes the SEP1 veneer to constantly report AU_AIS alarms due to the mismatch between the J1 and C2 overhead bytes of the docking device, so you need to pay attention to the consistency of the overhead byte settings when docking.
Impact on the system
ThisalarmcausesAU-3 service interruption.
Possible Causes
The upstream site received MS_AIS, R_LOS, R_LOF, B2_EXC, AU_AIS, and B3_EXC alarms.
1. the opposite end station sends a partial fault.
2. This station receives partial failure.
3. Failure of the cross-board of the opposite end station.
Related ProductsOptiX OSN 3500
OptiX OSN 3500 II
Phenomenon Description
After the OptiX OSN 3500 device is configured with a SEP1 single board and docked with data devices from other vendors, AU-AIS alarms are constantly reported.
Cause Analysis
1. For NG-SDH equipment, the alarm of the standby time slot is not detected in the pass-through state, which is inconvenient for fault localization, and if service interruption occurs after the inversion, it is necessary to loop back to locate the faulty site.
2, in the normal state, if you need to detect whether the standby time slot is normal, you can configure the service that passes through and hang up the table to test, for the standby time slot configured with the service, NG-SDH detects the alarm.
3, although under normal circumstances METRO5000, OCS and NG-SDH equipment group multiplexing section of the ring network is not a problem, but the special circumstances of the subtle differences as maintenance engineers should also know.
Operation Steps
- Login to T2000 and select "Network Element Manager".
- Select SEP1 board in the board tree, and select "Configuration > Overhead Management > VC3 Channel Overhead" in the function tree.
- Select the "Tracking Byte J1" and "Signal Flag C2" tabs, respectively, and check the J1 and C2 overhead bytes sent by the docking device, and find that they do not match the default values of Huawei devices. After resetting the overhead bytes to make them consistent, the AU-AIS alarm disappeared.
The technical information in this chapter and the related SDH equipment troubleshooting procedures are provided by Shenzhen Optical Transmission Network Technology Co. Huawei SDH optical transmission equipment, SDH transmission equipment sales phone: 13430988088 Welcome to call!
