RE: Signal vs. Idle debate (was: Here's a new idea)
Gentlemen:
I’ve 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 doesn’t 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 Cisco’s 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 Cisco’s 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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