From: Todd Derego (TDerego@nexabit.com)
Date: Wed Oct 11 2000 - 08:16:20 PDT
I don't want to use FR4 but I'm kinda stuck with a backplane I didn't have
anything to do with and they would like to go faster without changing the
backplane. I'm not sure this will work but have to make sure it won't before
I go and design a new backplane. It already has broadside coupling in the
backplane. I can change the plug in cards as I need to and luckly I see a
lot of opportunity there, but I don't know it if will be enough or not.
> -----Original Message-----
> From: Michael Nudelman [SMTP:email@example.com]
> Sent: Wednesday, October 11, 2000 11:12 AM
> To: Todd Derego
> Cc: firstname.lastname@example.org
> Subject: Re: [SI-LIST] : 2.5Gbps across a backplane?
> First, do not use FR-4.
> Try something else. We do, and it works without equalization. And the
> 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.
> 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?
> > 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
> > 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
> > email@example.com
> > >
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