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RE: Chapter 46: preamble length

On transmit, a conforming implementation will send seven preamble plus the

On receive, there is no current function that will change that length, but
the concensus of the committee was to keep the option open.  (In 802.3z we
did change preamble length for idle alignment.)  The D3.0 text should make
it clear that an implementation should be tolerant to changes in preamble
length, though it can still rely on lane alignment (Start in lane 0, SFD in
lane 3).  Text was added to warn that the Start and SFD could appear in the
same column.

--Bob Grow

-----Original Message-----
From: Danielle Lemay [mailto:dlemay@xxxxxxxxxxxxxxxxx]
Sent: Monday, March 12, 2001 10:38 AM
To: stds-802-3-hssg@xxxxxxxx
Subject: Chapter 46: preamble length

Is it possible for the preamble+SFD to be less than 8 bytes ?


Danielle Lemay
Design Engineer, Nishan Systems