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Posted by Stephen Sprunk on May 4, 2006, 6:29 pm
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> My beginner level understanding tells me that yes, there will always be
> a preamble as stated in the 802.3 specs.
>
> The preamble is always the first part of the transmission on the wire,
> even in FDX mode.
>
> Not sure what you mean by long distance communication, my simple
> explanation is that the preamble is "NIC to NICs" or seen in a single
> collision domain.
>
> So account for the preamle in the LAN segments, if your calculating BW
> across the WAN I would say it is not to be considered.
However, aren't there "frame packing" considerations when passing large
numbers of very small frames at 1GE and above? i.e. the preamble precedes
each transmission, but there may be more than one frame per preamble?
S
--
Stephen Sprunk "Stupid people surround themselves with smart
CCIE #3723 people. Smart people surround themselves with
K5SSS smart people who disagree with them." --Aaron Sorkin
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