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All, at the July plenary we established an Ad Hoc
on Mid-Span powering issues. As of the close of the July plenary, the
members of the Ad Hoc were:
Michel
Bohbot, , Chris DiMinico, Dan Dove, Robert
Love, Mike McCormick, Larry Miller, Sterling Vaden. In my
presentation, Mid-Span
Insertion and Generic Cabling Standards, I presented a "pregnant
snake" configuration that had noise from the dc-power coupled onto the signal
pairs as the only signal impairment. That presentation discussed the
wiring assumptions to be considered for any powering configuration.
I
invite all who are interested in this issue to join the AdHoc and help us
determine the following:
What
is the noise budget allocated to coupling from the dc powering circuitry and
what is the rationale for that allocation?
What
other configurations do you wish to consider? For each, develop a model
that shows the relevant signal imairments. We will then need to develop a
budget for the impairments germain to that configuration.
Since
the list of attendees with email addresses is not yet posted, I ask of both the
listed members and new volunteers to the Ad Hoc to send me an e-mail note
stating you will be participating. I will send a note to all that respond
in a few days with an email list of all members to date, so that we can each
create a Mid-Span Powering Ad Hoc email list to use in sending emails to each
other.
We
should be able to establish a signal impairment budget along with the rationale,
for each configuration we propose. Hopefully that work will be complete in
advance of the September interim 802.3af meeting, and we can generate a short
presentation of our results for that interim.
Best regards,
Robert D. Love
President, LAN Connect Consultants 7105 Leveret Circle Raleigh, NC 27615 Phone: 919 848-6773 Fax: 720 222-0900 email: rdlove@ieee.org |