remote PCU---remote router----E1----ADM------STM-1----NE40-----PDSN
clock mode on NE40 is slave remote PCU connect to ADM. ADM aggreate E1 into STM-1 channel.
packets dropped on some chaanel on NE40
1.change the cpos port ,can not slove it.
2.change the cpos card and slot , still can not slove it.
3.make the looback on the remote router ,ADM, no packets lost or CRC error.
4.request the TX engineer to check the information on NMS. some alarm about clock output.it means that the clock on ne40 can not match the TX clock.Because of clock mismatch on both end, it cause CRC error and INPUT error.
request the TX guy to change clock to slave , at the same time change the clock mode on NE40 to master.the problem sloved.
1.the cpos port maybe has some problems.
2.the cpos card maybe has some problems.
3.the slot maybe problem.
4.the TDM E1 link maybe the problem
5.the clock mode maybe the problem
the clock is import fact , it can impact the quality of link .