[SI-LIST] fiber-weave effect alive and well?

  • From: Gregory R Edlund <gedlund@xxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Thu, 30 Aug 2007 15:53:15 -0500

I would be interested in reading a paper that demonstrates measured jitter 
hit from fiber weave, i.e. apples-to-apples comparison for a specific 
application with and without the fiber-trace alignment.
Anyone have a good reference?

Greg Edlund
Senior Engineer
Signal Integrity
IBM Global Engineering Solutions
3605 Hwy. 52 N, Dept. HDC
Rochester, MN 55901

> [Original Message]
> From: agathon <hreidmarkailen@xxxxxxxxx>
> To: si-list <si-list@xxxxxxxxxxxxx>
> Date: 8/29/2007 5:47:36 PM
> Subject: [SI-LIST] fiber-weave effect alive and well?
> * I've reviewed DesignCon 05,07 material on fiber-weave effect.
> * A 10G (802.3ap) PHY vendor claims their demo setup used FR408 (Dk/Df =
> 3.77/0.012) for backplane sections and a total channel of 1meter.
> * FR408, as far as I know, still has the basic weave/resin construction,
> though perhaps less Dk delta.
> Q:
> 1. Huh?  What happened?  Did the PHY vendor call in the wizard kids from
> Hogworts?  What is the current reality?
> 2. Any knowledge of Rogers4350?  Ie: a different construction?  Weave
> effect?
> 3. Up to date publications on this?  (Besides references in the above 
> material.)
> Also, I see no mention of the weave effect on authoritative things from
> 802.3ap people on commsdesign or elsewhere, from 2004 on.

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