* swmike@swm.pp.se (Mikael Abrahamsson) [Fri 16 Nov 2001, 16:21 CET]:
> I'm trying to figure out if Singlemode (LX) GBICS will work using
> Multimode cabling.
It does. We did this extensively at HAL2001, with equipment from Cisco,
Juniper, Extreme and Foundry, with links over 300 meters of bad MM cable
with wonky connectors. (Sorry, University of Twente, but that's how it is!)
A "mode attenuation patch cord" is a half SM half MM patch cord, where
the SM part connects to the TX on the GBIC. If you use them (you should,
I still think; we didn't and fought a few days with rotten links and
extreme packet loss until we had found what worked), use them on both
ends. We ended up not finding them until the weekend had started, and
by then we had found a combination of cables that did work until the end
of the three-day event.
Check the archives of the HAL2001 FHQ (Field Headquarters) mailing lists
at <URL:http://www.hal2001.org/mailman/listinfo/hal-fhq> for some
discussion and a summary of the network there that I wrote afterwards.
By the way, LX doesn't equal single-mode; and if you use a cable that's
longer than 5 meters your chances may already improve.
-- Niels.
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