We do this all the time to get the additional range on our existing fiber
structure.. You need a special SM-MM launch cable. Cisco sells them
Mikael Abrahamsson wrote:
> I'm trying to figure out if Singlemode (LX) GBICS will work using
> Multimode cabling.
>
> Experiences so far are that if I insert MM cables into LX gbics then I do
> not get link. If I unplug the MM connector a few millimeters in one or
> both ends, then I get a link and I seem to be able to transfer data
> correctly. So far I have not seen any CRC errors on the link in question.
> (100.000 packets tested so far).
>
> The cable I'm using is only 5 meters, I'm going to try with a 100 meter
> cable later on.
>
> Does anyone KNOW if this is a setup that should work? I talked to one
> person who said that SM gbics are supposed to work the same distance in MM
> cabling as the MM gbics, ie around 500-1000 meters or so, but I have not
> heard this before.
>
> I have two reasons for this, first of all I want to know in case I ever
> have to do an emergency patch somewhere and I only happen to have MM
> cabling available. Secondly I have a case where I need to do a temporary
> setup and I only have long MM cabling and we do not use MM gbics but have
> plenty of SM gbics.
>
> SM=singlemode=LX
> MM=multimode=SX
>
> --
> Mikael Abrahamsson email: swmike@swm.pp.se
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