Yes, by all means clean the fibre patches at both ends... both the patch leads, and the fibre at the back of the FOBOT.. And clean any intermediate patching.... And an OTDR test can identify anything along the path that is causing higher than expected loss....
However, it may be that the easiest solution is to step up to 10GBase-ZR optics - which tend to have a power budget of around 23 dB, rather than the 10GBase-ER which typically have a power budget of ~ 15 dB. Tim. Tim Rayner Optical Engineer, AARNet Pty Ltd street address: Building 9, Banks Street, YARRALUMLA ACT 2600 postal address: GPO Box 1559, CANBERRA ACT 2601 t. +61 2 6222 3575 f. +61 2 6222 3535 e. [email protected] w. www.aarnet.edu.au Network Faults (24x7): 1300 APL NOC (1300 275 662) or [email protected] important This email and any files transmitted with it are confidential, and the rights of confidentiality in such information are not waived or lost by its mistaken delivery to you. Any dissemination, copying, use or disclosure of the email and/or such files without the permission of AARNet, or the sender, is strictly prohibited. If you have received this email in error, please contact the sender immediately and delete all copies of this transmission. ________________________________________ From: juniper-nsp [[email protected]] on behalf of Jared Mauch [[email protected]] Sent: Friday, 24 January 2014 12:36 AM To: Ali Sumsam Cc: <[email protected]> Subject: Re: [j-nsp] Power issues on 10Gig link On Jan 23, 2014, at 8:14 AM, Ali Sumsam <[email protected]> wrote: > Hi All, > > I am using a SFP-10GBase-ER for my Cisco3750X for a 10gig link going to a > Juniper MX5-T router (10GE XFP) > > > I am receiving following logs on my Cisco3750X. > > %SFF8472-5-THRESHOLD_VIOLATION: Te1/1/2: Rx power low alarm; Operating > value: -21.3 dBm, Threshold value: -20.0 dBm. > > No logs on Juniper. > > Does this mean I have to increase the power on the interface? > Or is there anything else I need to look at? > > Following are the readings from my Juniper router. > > Laser rx power high alarm threshold : 1.2589 mW / 1.00 dBm > Laser rx power low alarm threshold : 0.0158 mW / -18.01 dBm > Laser rx power high warning threshold : 1.0000 mW / 0.00 dBm > Laser rx power low warning threshold : 0.0199 mW / -17.01 dBm > You need to take a look at your span length and OTDR numbers. Was there recently a bend in the cable that caused this attenuation? Do the light levels improve when cleaned? If you replace the optic does the situation improve? Is the launch power the same in both directions, but just low on the RX side facing the Cisco? Finding the answers to these questions should resolve your alarms. - Jared _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
