Chinese
English
This section describes the phenomenon, impact on the system, possible causes, tools needed for troubleshooting, precautions, and processing steps when OSN3500 grounding faults cause service interruption. You can use the meter to test whether the grounding resistance value of BGND and PGND meets the requirements of the index, and you can also use the meter to check whether the waveform of the docking signal is deformed and distorted. Check whether the grounding row of the user's computer room has good contact. If the contact is good, continue with the next step; otherwise, re-ground. Check whether the contact between the transmission equipment cabinet and the grounding row of the room is good. If contact is good, continue to the next step; otherwise, re-ground. Check that the front and side doors of the cabinet make good contact with the cabinet. If contact is good, continue to the next step; otherwise, re-ground. Check that the subracks are making good contact with the cabinet. If contact is good, continue to the next step; otherwise, re-ground. Check that the signal cable is well grounded. If the grounding is good, continue to the next step; otherwise, re-ground. Check whether the grounding of DDF and ODF is good. If the grounding is good, continue to the next step; otherwise, re-ground. Low-order channel errors are generated at the site due to loose grounding cables, which can be resolved by reconnecting the protective ground.
Product Description: OptiX OSN 3500
OptiX OSN 3500
OptiX OSN 3500 II
Fault Class
Error Code
Phenomenon Description
The transmission network consists of five sites in the MSP ring, and the sites are named Site1, Site2, Site3, Site4, and Site5 in counterclockwise order; Site1 is the gateway, and the other sites and Site1 have only 2M services; the clock source of Site1 is the external clock source, and the other sites track the westbound line. When querying the alarms and performance, it is found that the low-order channels of Site1, Site2 and Site3 have a large number of BERs. At the same time, Site4 and Site5 also have a small number of BERs in their low-order channels.
Cause Analysis
All sites have low-order channels with false codes. There may be the following reasons, which need to be investigated one by one.
- All sites have business with Site1, so the problem is likely to be in Site1. for Site1 site, it is very unlikely that all PQ1 veneers have problems, and it is likely to be a line board SL16 problem.
- The fan may have failed, leading to high-order channel misrouting, which in turn leads to low-order channel misrouting.
- Site1 may have problems with the 2M cables and cables and cable-to-cable connections.
Operation Procedure
- Query historical performance data. Reset the performance and then query the current performance. the error code still exists.
- Query all site circuit boards, no higher order channel BERs were found.
- Checked fans, no abnormality found, BER still exists.
- Check the environment of the equipment, and found that the protective ground is loose. Tighten the protective ground wire, and then query the performance, no error code was found.
Reference Information
None.
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!
