[c-nsp] Single-mode GBIC question

[Michael K. Smith - Adhost]

Hello Les:

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of les
> Sent: Friday, May 30, 2008 11:18 AM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Single-mode GBIC question
> 
> I've combed the web with no luck to the answer of my simple
question....
> 
> If you use SINGLE-MODE fiber and gbics for very short runs (same room,
> across the street), can you damage the GBICS?
> 
> What has been your experience. Oversaturation? Life-shortening? We
> typically use SM towards the telco and MM for internal but have ran
> into some legacy fiber where it's SM internal. I have electronic
> background so terminology is familiar.
> 
> thanks in advance
> -les

It depends.  :-)  If your using LX/LH optics you should be fine.  Here's
a good breakdown of TX/RX parameters on the various Cisco optics.  On an
LX/LH optics, your TX is -3 to -9.5 and your receive is -3 to -20, so
even back to back at -3 to -3 you would be okay.

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6577/product
_data_sheet0900aecd8033f885.html

Regards,

Mike