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The Service Are Interrupted Due to the Off-Standard Input Jitter Tolerance at the 2M Port of the Third-Party Protocol Converter

Publication Date:  2012-07-25 Views:  42 Downloads:  0
Issue Description
At a certain office, a protocol converter that converts 2M signals into FE signals is connected to the 62PQ1 on the OptiX 2500+ for service deployment. After services are cut over, the services are migrated to the OptiX OSN 3500. When the protocol converter is interconnected to the N2PQ1 on the OptiX OSN 3500, the services are interrupted.

The version information is as follows:

OptiX 2500+: NE version, 62PQ1 board software version 6.206.20

OptiX OSN 7500: NE version, N2PQ1 board software version 3.17 
Alarm Information
Handling Process

1. Replace the protocol converter with one from another manufacturer. After that, the services become normal.

2. Test the jitter and frequency offset of the N2PQ on the OptiX OSN 3500 and the 62PQ1 on the OptiX 2500+ in the lab (see the result in the attachment). It is found that the two parameters on the two boards meet the requirement, even through the output jitter of the N2PQ1 is slightly higher than that of the 62PQ1.

3. Advise the customer to negotiate with the protocol converter manufacturer to provide the test indexes of the converter. It is found that the 2M input jitter of the protocol converter exceeds the threshold, and the threshold is just between the output jitter of the 62PQ1 and that of the N2PQ1. After the protocol converter manufacturer improves the device, the problem is rectified.