Description of the problem

1, OSN3500 equipment SSN1GSCC after the failure of the main control board, replace the main control board found that some of the chain hanging off the pipe, but the business is normal

2, ECC link management can see these de-regulated network elements, and many of them are the distance of 0, and noted that the distance of zero as many as 32 network elements

3, the most common reason for this phenomenon is that these network elements of the gateway network element selection error, but check and find that the choice is correct, and the command line can not log in, to rule out the cause of the network management

4. Host version 5.21.13.47P01

Processing

1, query the ECC mode to confirm that 40, 0, 0

2, query case, before the case SC0000474622 said R1 and R2 version only supports 24-way ECC, according to the case to open the NE3500.ini file, found that it is to support 40-way ECC, the idea of a deadlock.

3, after all, with the R1 and R2 versions of the phenomenon is similar to the attitude of trying to close some of the optical port of the ECC, found that the other network elements of the ECC immediately landed up, proving that the R3 version also supports only 24-way ECC.

4, further, we note that in addition to the NE3500.ini file, there are NE3500_128.ini and NE7500.ini this more ini files, open the NE3500_128.ini file shows MaxConnect = 24

After consulting with R&D, we confirmed that NE3500_128.ini is the configuration file for N1SCC, and NE3500.ini is the configuration file for N1GSCC, so NE3500.ini shows MaxConnect=40.

5, and finally some of the network elements with the access ring in one direction of the ECC off, so that the distance is 0 network elements to maintain 24 after all the network elements to monitor normal.

Root Cause

N1GSCC only supports 24-way ECC

Solution

Replace with OSN3500 SSN1GSCC

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