Re: Technical Material for DTE Pwr via MDI
As the editor of the 802.9f document, I can assure you that while there was
a straw poll taken related to some technical issued contained in it, it was
not circulated for a successful ballot. The environment for this work was
slightly different from the 802.3 work under consideration in that the
powering was to provide for the circuit switched portion of 802.9 without
the packet portion of the interface. That being said, it does however
address in embryonic form the issues that need to be considered within the
context of this group.
I'll see you in York.
Cisco Systems Inc.
At 01:52 PM 9/23/99 , Geoff Thompson wrote:
>Among the technical activities that we will have to undertake in the DTE
>Pwr Study Group and the Task Force that will follow is a survey of the
>constraints to the problem we are trying to solve and a survey of proposed
>I am providing two documents in that context only.
>P802.9f Draft 7
>Despite the documents finished appearance please do not consider this
>document in any other context than as offered above. To my knowledge there
>was never any formal balloting in 802.9 on the document. 802.9, the group
>and the project have both gone away. The 802.9f project was withdrawn and
>the PAR was cancelled. Most importantly, there was no systematic review of
>the document during its development by 802.3. It MAY have valuable
>material, but whatever is there has to be validated by our group in the
>context of our own problem. The document is retrievable from:
>FDDI TP-PMD Annex I (informative)
>One of the major constraints on the generating a solution to the DTE power
>problem is the "common mode termination" of unused pairs that is commonly
>found on 100BASE-Tx implmentations (including 10/100). There is remarkably
>little on this in the standards literature. The one place where it shows up
>at all (and in rather minimal and unsatisfactory form) is the reference
>above. The document is retrievable from:
>I expect both of these items to be useful during our technical discussions.
>I look forward to seeing you in York.
>| Geoffrey O. Thompson |
>| Chair IEEE 802.3 |
>| Nortel Networks, Inc. M/S SC5-02 |
>| 4401 Great America Parkway |
>| P. O. Box 58185 |
>| Santa Clara, CA 95052-8185 USA |
>| Phone: +1 408 495 1339 |
>| Fax: +1 408 988 5525 |
>| E-Mail: gthompso@xxxxxxxxxxxxxxxxxx |
>| Please see the IEEE 802.3 web page at |
Cisco Systems Inc.