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Re: XAUI AC coupling

The Fibre Channel - Methodologies for Jitter Specification draft technical
report contains an annex which describes worst case low-frequency test
patterns and the effect of low-frequency cut-off on the eye diagram. Look
in (Annex B). I think this
contains the information you're looking for.

John Ewen

"Paul Wilson" <pwil@xxxxxxxxxxxxxxxxxx> on 09/21/2000 05:05:45 AM

Sent by:  owner-stds-802-3-hssg@xxxxxxxx

To:   stds-802-3-hssg <stds-802-3-hssg@xxxxxxxx>
Subject:  XAUI AC coupling

To all XAUI users vendors,

My appologies if this question has already been  answered.
AC coupling is part of the XAUI specification but no minimum  capacitor
size has been included. At some point all XAUI users have to answer  the
question of what capacitor size to use so I propose that it is included in
the specification. The format could be something like:

Maximum low frequency cut-off caused by AC coupling of XAUI  data: ____ Hz.
Minimum recommended AC coupling capacitor size in XAUI  channels: ____

To fill in the blanks above requires some spectral information  of the
8B10B data going over the XAUI link. Can anyone help here?

Paul Wilson
Nortel Networks