[c-nsp] Fiber GBIC Question

[Jay Ford]

On Mon, 27 Mar 2006, Paul Stewart wrote:
> We have a pair of 2950's that are going to be connected over single-mode
> fiber shortly...  Single mode is the only option for us.
>
> The distance is going to be only about 200 feet roughly (carrier-hotel)
> and the only GBIC that supports a really short distance seems to be
> multi-mode.  If I use a WS-G5486 they are rated at 6.2 miles but that
> seems to be the shortest single mode option... Do I need to put
> attenuators in place then?
>
> Just wondering as this seems to be common in carrier-hotels where single
> mode is only option sometimes.....

For Cisco's 1000BASE-LX/LH, the hottest launch power of -3 dBm is within the
receive window (-3 to -19 dBm), so you don't have to attenuate even for short
distances.

See the docs for the GigEther interfaces for the full transmit & receive
specs.

________________________________________________________________________
Jay Ford, Network Engineering Group, Information Technology Services
University of Iowa, Iowa City, IA 52242
email: jay-ford at uiowa.edu, phone: 319-335-5555, fax: 319-335-2951