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The
case that might have driven the statement is locals that put two ethernet
channels per 4 pair cable ... This would be 2, 2 pair
implementations. It was unclear to me if we have chosen to rule this cae
out totally.
Martin
Martin Patoka Systems Engineer Texas Instruments 214-567-5487 mpatoka@xxxxxx -----Original Message-----
From: owner-stds-802-3-poep@xxxxxxxx [mailto:owner-stds-802-3-poep@xxxxxxxx] On Behalf Of Yair Darshan Sent: Wednesday, September 14, 2005 3:56 PM To: STDS-802-3-POEP@xxxxxxxxxxxxxxxxx Subject: Re: [8023-POEP] List of questions regarding cabling and connector s Hi
Steve, The meeting right now
is addressing the questions we have to the ISO/IEC
committee. Regarding the validity
of Jo's work I have also noticed this point and as I mentioned earlier his work
requires further review since few things there obviously
not reflecting our system behavior. I'll review it in details and we will
discuss more on it. Yair From:
owner-stds-802-3-poep@xxxxxxxx [mailto:owner-stds-802-3-poep@xxxxxxxx] On Behalf Of Regarding the issue of cable heating, I have a concern
about Jo Wallings analysis. In his supporting document,
"walling_2_0905.pdf" the last sentence in the second paragraph states "...under
the assumption that all pairs in all cables are energized with the same
current." This is a valid
assumption for PoE Plus, since it appears very likely that we'll use a 4-pair
system. But Jo's assumption is invalid for 802.3af since only half of
the pairs are carrying current. So I think Jo
overestimated the heat dissipation in the cables (for 802.3af) by a factor of
2. |