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When the OSN3500 performs loopback testing of cascaded services, it is necessary to simultaneously perform intra-VC4 loopback on all VC4 channels of the cascaded services to be tested.
Products
- OptiX OSN 1500A/1500B
- OptiX OSN 2500
- OptiX OSN 3500
- OptiX OSN 3500 II
- OptiX OSN 7500
Failure Category
- Other
Phenomenon Description
The 61st to 64th VC-4s of the 6-SL64 board of a customer's network OSN device are configured with a VC4-4c cascade, and need to perform a loopback test for the cascade service. The tester performs an inner loopback on the 61st VC-4 and returns a failure.
Cause Analysis
Analyzing the overhead bytes of the cascade service, it can be seen that, except for the 61st VC-4 whose "C2 Receivable" byte is "HDLC/PPP Mapping", the 62nd to 64th VC-4 whose "C2 Receivable The "C2 Receivable" byte of the 62nd to 64th VC-4 is "Unloaded". Therefore, when performing loopback test for cascaded services, it is necessary to loopback all VC4 channels of the cascade at the same time.
Operation Procedure
- On the main topology diagram of network management, select the network element that needs to be looped back, right-click, and select "Network Element Manager".
- Select the optical interface board that needs to be looped back, and then select "Configuration > SDH Interface" in the Function Tree.
- Select "By Function", and then select "VC4 Loopback" in the drop-down menu.
- Set all VC4 channels of the cascade service to be tested as VC4 inner loopback. Click Apply.
The technical information and related SDH equipment troubleshooting procedures in this chapter are provided by Shenzhen Optical Transmission Network Technology Co. Huawei SDH optical transmission equipment, SDH transmission equipment sales phone: 13430988088 Welcome to call!
