3Com switches and 1000Base SX problem

Archived from groups: comp.dcom.lans.ethernet (More info?)

In article <1121402726.494900.289690@f14g2000cwb.googlegroups.com>,
<flamingjay@gmail.com> wrote:
:I have a strange problem. Our customer has multimode fiber installed
:between wiring closets. They have 3Com 3300 series switches and 4007
:switches both with 1000BaseSX ports. 3300s can connect to 3300 from
:closet to closet, 4007 can connect to 4007 from closet to closet, but
:if you take the same fiber and plug in 3300 to 4007, it won't even get
:link. If you plug in a 3300 to a 4007 just with a 6' patch fiber, it
:will work.

You might have explored this already...

but that sounds like it might be a difference between the transmit
and receive pairing. Did you try exchanging the pair members in
one place?
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