[Asterisk-Users] [OT] Old Building Needs a New Telephone System

[Harry McGregor]

802.3AF calls for power to be on the data wires

http://standards.ieee.org/getieee802/download/802.3af-2003.pdf

Table 33C.1 and 33C.2 on page 90 clearly states that in mode A

Terminal A is on pin 3
Terminal B is on pin 6
Terminal C is on pin 1
Terminal D is on pin 2

There is a mode B which uses 4,5,7,8

Endpoint based POE may support either A or B, while midspan can only
support option B (Page 29).

			Harry

On Mon, 2004-11-08 at 13:53 -0700, Kevin P. Fleming wrote:
> Paul Rodan wrote:
> > It actually uses 2 wires for positive and 2 wires for ground/negative? So
> > it's combing 2 wires (instead of 1) to deliver more power? 
> 
> I believe so, although apparently there is a configuration where the 
> power is present on the data wires instead... I've never seen that though.
> 
> > Which 2 are positive and which 2 are negative/ground? 
> 
> I do not know for sure... I'm looking at a page that says 4/5 are 
> positive, and 7/8 are negative. It must be correct, because it's a page 
> on how to build your own injectors/splitters :-)
> 
> http://www.nycwireless.net/poe/
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-- 
Harry McGregor, Computing Manager
Tucson Support Group - U.S. Geological Survey
University of Arizona - Environment and Natural Resource Building
520-670-5574 (office) - hmcgregor at espri.arizona.edu
520-661-7875 (Cell) - hmcgregor at usgs.gov

The opinions/statements expressed herein are my own and should
not be taken as a position, opinion, or endorsement of the
University of Arizona or the U.S. Geological Survey.