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I'll start with my votes:
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1) Should we accommodate crossover cables, i.e. take either polarity of power? (more cost in the PD)
yes_____ no__X___
in order to save cost, let's accept straight through cables only
2) Should we require having a non-linear component in series with the signature resistor for discovery?
yes_____ no__X___
probably not necessary
3) Should we pick one and only one pair at this time to send power?
yes__X___ no_____
If yes, then pick one: 1236__X___ 4578_____
I think that it will be hard enough to agree on one pair, let alone both.
It seems that 1236 will give the widest acceptance, let's leave use of the other pair open for the future.
4) Should we specify power for both pairs, with the second pair being optional for higher power?
yes_____ no__X___
same reasons, leave the second pair for the future
5) Should we leave open the possibility of using the second pair for power in the future?
yes__X___ no_____
Yes, allow for higher power in the future
6) If we were to allow power on both pairs,
should we make discovery on each pair independent of the power on the other pair?
yes__X___ no_____
Yes, the 2 pairs should be independent
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-----Original Message-----
From: Brooks, Rick [SC5:321:EXCH]
Sent: Tuesday, November 21, 2000 7:23 AM
To: stds-802-3-pwrviamdi@xxxxxxxx
Subject: it's time for another poll
OK,
we have decided one thing, but there are many other items that we have not really agreed to yet.
I wanted to take a non-binding poll to see what people are thinking.
In order to facilitate this, I have compiled several PD front end schematics for your enjoyment.
I show the needed polarity diodes and the under-voltage lockout circuit, followed by some kind of power supply.
The under-voltage lockout circuit could close the series load FET at the same time as opening the signature FET,
but that is of course optional.
These circuits help to illustrate how many components are needed for the various options.
Please look at this file before proceeding:
<http://www.ieee802.org/3/af/public/documents/pd_configs1.pdf>
*************************************************************************************
Please reply with you votes, or comments on these questions:
1) Should we accommodate crossover cables, i.e. take either polarity of power? (more cost in the PD)
yes_____ no_____
2) Should we require having a non-linear component in series with the signature resistor for discovery?
yes_____ no_____
3) Should we pick one and only one pair at this time to send power?
yes_____ no_____
If yes, then pick one: 1236_____ 4578_____
4) Should we specify power for both pairs, with the second pair being optional for higher power?
yes_____ no_____
5) Should we leave open the possibility of using the second pair for power in the future?
yes_____ no_____
6) If we were to allow power on both pairs,
should we make discovery on each pair independent of the power on the other pair?
yes_____ no_____
*************************************************************************************
This poll is certainly not official or binding, I'm just trying to get some discussion and opinions going.
thanks,
- Rick