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RE: Signal vs. Idle debate (was: Here's a new idea)




Gentlemen:

Iíve just joined the group, so this may be out of line.

IMHO, it seems that what IEEE decides may not matter. While IEEE debates the 
method that "should" be used to provide power down Ethernet cabling, Cisco, 
the leader in the industry, has announced what the solution is. Long before 
IEEE ever gets a standard agreed to and published, the following products 
will be widely used and any standard that doesnít support this de facto 
implementation will simply be ignore.

If you refer to 
http://www.cisco.com/warp/public/cc/cisco/mkt/iptel/prodlit/cippp_ds.htm you 
will find the basic specifications for Ciscoís Catalyst Inline power Patch 
Panel.  This device does mid span power insertion on pins 4&5 and 7&8.

If you refer to 
http://www.cisco.com/warp/public/cc/cisco/mkt/switch/cat/6000/prodlit/c6ipt_ov.htm 
you will find the basic specifications for Ciscoís Catalyst 6000 switch 
family which powers endpoints over pins 1&2 and 3&6.

Based on these products, Cisco has determined that endpoints will have to be 
able to be powered from the signal and/or idle wire pairs.

Obviously Cisco has determined a viable solution so why not accept it?


Paul Yew



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