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FAQ—how to find a broken XFP

Publication Date:  2012-07-27 Views:  46 Downloads:  0
Issue Description
Q: How to find a brocken 10G SFP ?
Alarm Information
These 2 alarms appears after inserting a brocken XFP on one 10GE inyerface on the LPU :

aug 25 2011 22:12:35 ne40e-x3_r3_jebeniana %%01srm/2/nodefault(l)[13]:slot=1;pic 0 of lpu1 is failed, perhaps txbiaslowalarm of xfp21 alarm is abnormal. (reason= "l2xeeg0 xfp21 tx bias low alarm, please check and change a new xfp"
aug 25 2011 22:12:35 ne40e-x3_r3_jebeniana %%01srm/2/nodefault(l)[15]:slot=1;pic 0 of lpu1 is failed, perhaps rxpowhighalarm of xfp21 alarm is abnormal. (reason="l2xeeg0 xfp rx power high alarm, current rxpower is 0.37dbm. ")


Handling Process
After doing a self loop on 10 Gbit/s XFP optical module (XFP-10G-sm1550-80km), an alarm appear and the Rx power on this interface stay the same ( either this interface is connected to another one or not).

The XFP-10G-sm1550-80km send a high Tx power value. When doing a local loop on this interface this Tx value will genarate a high Rx power. this will damage the XFP.

Root Cause
null

Suggestions
Do not do a self loop on this type of XFP, because  TX power of this xfp module is far higher than RX power. when we do a self loop, the XFP module was broken by itself..


END