Optical power checked with power meter at FMS is OK, But MUT_LOS alarm recived on OAU101 connected after FIU.
MUT_LOS alarm oberved, it means Multichannel LOS
After doing the basic anallysis we came to know that there some problem at last ILA site.
One FLE sent to last ILA site with OSA,OPM,Patchcords & attenuator.
We checked the OAU MON port with OSA, results OK.
But when we cconnected the OSA at FMS IN port, then we checked the patchcord between OAU101 OUT to DFIU WRC.
After replacing the patchcord problem got resolved
we checked the optical power is recived on FMS out port, Also we checked the last ILA site OAU101 MON port with OSA, ALL channel are OK.
But these channels not recived at OTM location.
Internal fiber connectivity should be done very carefully & fiber routing should be clean.
durring the internal fiber connection all patch cords should be cleaned with fiber cleaner