Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

interface TeGig, xfp remains up with low Rx DBm

Hi, anyone knows why the interface remains up, when is receiving a lower power than the expected. Can we avoid this ?? how ?

SPA-1X10GE-L-V2  with XFP-10GLR-OC192SR

The Receiver sensitivity (maximum)  is 10GLR SR-1: -12.6 dBm

We were receiving -20 but, the interface remain up.

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

interface TeGig, xfp remains up with low Rx DBm

i think its normal, many times observed in lab during re-ceates, photodiode stops sensing beyond its recevier senstivity but the light is enough to show the port UP and also no issues with frames/traffic.

but you may observe errors after sometime.

example:

many ONS-XFPs (full tunable) recevier senstivity is around -26dBm, but they remain UP with low optical power close to -29, -30, few times power shown -40 (means no optical power) by system.

so its normal.

3 REPLIES
Cisco Employee

interface TeGig, xfp remains up with low Rx DBm

i think its normal, many times observed in lab during re-ceates, photodiode stops sensing beyond its recevier senstivity but the light is enough to show the port UP and also no issues with frames/traffic.

but you may observe errors after sometime.

example:

many ONS-XFPs (full tunable) recevier senstivity is around -26dBm, but they remain UP with low optical power close to -29, -30, few times power shown -40 (means no optical power) by system.

so its normal.

New Member

interface TeGig, xfp remains up with low Rx DBm

Hi ! thanks very mych for your response.Do you think we can tune this, to avoid this situation ??

Cisco Employee

interface TeGig, xfp remains up with low Rx DBm

no its not possible to tune it.

but yes we can set some threshold so that will get alarms when it goes below certain level.

this we can do on ONS equipments, need to check for routers and switches.

502
Views
0
Helpful
3
Replies