Re: [802.3af] Late comment
Roger-
What I beleive we are missing is that if you tie all of the "GROUNDS"
together in a PSE
AND
If you put a voltmeter between "hot" leads from 2 different PSEs,
then is the max voltage between the leads (fault conditions included):
VportMax
VportMax - VportMin
Zero
2 X VportMax
I contend that any answer above except [2 X VportMax] is OK
and
We currently have no text to preclude [2 X VportMax].
It was agreed in Vancouver that this is a problem.
I would happy if you could point to text that would prove me wrong.
Geoff
At 09:37 AM 1/13/2003 -0800, Roger Karam wrote:
>Hi Jeff
>
>if you feel this is a must for some reason, please clarify to the group
>we defined that 3,6 is the higher potential! we are floating,
>is this not enough?
>so automatically gnd would be on 3,6... for a -48v supply
>what am i missing?
>roger
>
>
>
>At 08:47 PM 1/12/2003, you wrote:
>
>>Colleagues-
>>
>>During the meeting in Vancouver I asked the group's indulgence with
>>respect to acceptance of yet another comment from me.
>>
>>There seemed to be general agreement that the comment addressed an issue
>>that was important enough that it should be accepted.
>>
>>The comment:
>>I can find no place where there is a specification as to which side of
>>PSI is tied to ground (i.e. negative ground vs. the positive ground
>>usually found in mid-fifties British sports cars with Lucas electrics.) I
>>request that a specification be added that dictates which side of the
>>supply is grounded.
>>
>>This documents my request to add this comment to the database and address
>>it during the Santa Clara/January meeting.
>>
>>Thanks,
>>
>>Geoff
>>
>>|=========================================|
>>| Geoffrey O. Thompson |
>>| Vice Chair, IEEE 802 |
>>| Nortel Networks, Inc. M/S: P79/06/B04 |
>>| 4655 Great America Parkway |
>>| P. O. Box 58185 |
>>| Santa Clara, CA 95052-8185 USA |
>>| Phone: +1 408 495 1339 |
>>| Fax: +1 408 495 5615 |
>>| E-Mail: thompson@xxxxxxxx |
>>| Please see the IEEE 802 web page at |
>>| http://www.ieee802.org/