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

  • From: agathon <hreidmarkailen@xxxxxxxxx>
  • To: si-list <si-list@xxxxxxxxxxxxx>
  • Date: Wed, 29 Aug 2007 17:00:25 -0700

* 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.

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
3. Up to date publications on this?  (Besides references in the above DCon

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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