Re: [SI-LIST] : 2.5Gbps across a backplane?

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From: Vinu Arumugham (vinu@cisco.com)
Date: Wed Oct 11 2000 - 09:40:46 PDT


Broadside coupling usually means significant coupling between the signal
conductors of the differential pair. However, many backplane connectors may have
little coupling between the signals of a differential pair.

For optimal performance, the type of coupling used on the board may have to be
compatible with the type of coupling in the connector.

Thanks,
Vinu

Michael Nudelman wrote:

> Todd:
>
> First, do not use FR-4.
> Try something else. We do, and it works without equalization. And the backplane
> is huge. The traces' runs are up to few feet. Also try to use broadside
> coupling; if your skin losses are high, this helps a bit.
>
> Mike.
>
> Todd Derego wrote:
>
> > I'm working to take a present 1.25Gbps backplane to 2.5Gbps or
> > faster. Any thought on transceivers with preemphasis and/or adaptive
> > equalization to help get 2.5Gbps or better across a long FR4 backplane? The
> > eye looks pretty collapsed at 2.5Gbps but I have seen some products the
> > drive across a twisted pair and seem to recover a signal from something that
> > does look much like a signal.
> > Thanks!
> > Todd
> >
> > Todd DeRego
> > Senior Signal Integrity Engineer
> > Lucent Technologies INS
> > 200 Nickerson Road
> > Marlborough MA 01752
> > (508) 786-2168
> > tderego@lucent.com
> > >
> >
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