Description of the problem

A bureau in order to enhance the stability of the equipment, the original SDH equipmentOSN3500 single-master equipment upgraded to dual-master, the original master for the N1SCC, network element supporting version 5.21.13.47P01, the new replacement of the two master single board for the N3SCC02, version 5.21.18.50P01, due to the original master of the highest supported version of R3, and the new master does not support the downgrade for R3, so it is still in accordance with the guidebook "OptiX OSN3500 SCC to GSCC Upgrade Guidebook-B" operation, but after replacing it with the N3GSCC download, the checksum startup fails, the service is cleared, and the download fails.

Alarm message

Parameter error (received command parameter is illegal), error code: 38752

Processing

1. Plug back the N1SCC download to resume service;

2、Upgrade the spare cross EXCSA from 3.19 to 8.13, and invert the cross to the 8.13 version of the single board;

3, unplug the original primary cross EXCSA with version 3.19 (reserved for the eventuality of business recovery);

4. Replace the SDH equipmentOSN3500 N1SCC with N3GSCC and download the data, successfully;

5, upgrade the network element to the matching version.

Root Cause

There is a strict strong matching relationship between the OSN3500 versions of SDH equipment, and the R3 and R8 versions span too much, which leads to the failure of cross-checking during download, resulting in the failure.

Suggestion and Summary

1, the operation must be in strict accordance with the instructions, such as version, veneer and other discrepancies, be sure to confirm clearly one by one;

2, NG-SDH version or need to be strictly version of the supporting relationship, try to unify.

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