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




I give up, I'm  jumping in.  It's hard to read all of this and not comment.
 Many doubt it will be a defacto standard because it has not been shown to
be robust enough, there is not one solution for mid-span powering, and many
of us are finding the announcement is only confusing customers and I
suspect making them shy away from any adoption, or even experiments, until
IEEE has a standard.  I believe historically in Ethernet any solutions at
odds with the IEEE standards have a limited market size and life.  Things
change, but "those who don't learn from history are doomed to repeat it".
In Ethernet IEEE standards have history on their side.
\Paul



At 02:22 AM 5/5/2000 MDT, Paul Yew wrote:
>
>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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