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Interfarence between managment power & traffic power

Publication Date:  2012-07-25 Views:  52 Downloads:  0
Issue Description








Even if OAU out is shut off, still far end OAU receives optical power at IN.





 



Alarm Information






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Handling Process








We added 10db attenuator on ST2 TM port of last ILA, Now if we shut off laser then we recive not receive power at OAU IN port, MUT_LOS is observed on OAU.










Root Cause

In case of shorter span distance or low optical fiber loss between ILA to ILA or ILA to OTM, We have observed the interference b/w OSC & Channel power.
For example:-
When we measure the optical power on below ports of FIU
In case of OAU out LASER ON in LAST ILA,Power measured on FIU
TC is -9 dB
TM is -15dB

OAU out LASER OFF in last ILA,Power measured on FIU

TC is -33 dB
TM is -15dB

As per ideal scenario power at TC should be -60.


 



Suggestions

 

If span distance & loss is low then we should add attenuator on TM of ST2 card . Now the ST2 Tx power is degraded & it will not interfere with traffic.




 



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