one day ,before upgraging an OSN3500 equipment we did some protection test.
after we swiched the XCS board from work board to protection board ,customer said
one signal service of MSC was interrupted but other service was normal. and customer
said the signal service trace the clock to OSN3500 equipment.there was
no special alarms and performance in OSN3500 equipment except a minor alarm SYN_BAD.
finally we replaced the XCS board and swich the XCS board again ,all the service is normal.
1,check the clock configuration ,no problem.
2,hard reset the XCS board ,the alarm still appeared
3,replace the board alarm disappeared
then switch the XCS board again ,all service was normal
the signal service needs very high quality clock.but the clock module of the SXCSA board was broken ,so it can not suply high quality clock,so the signal service
was interrupted.but other service does need high quality clock,so it is normal.
when there is alarm in XCS board ,handle it at once ,and don't suppress any alarm in XCS board