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Anonymous
Posts: 0

PoE on GbE circuits

Would someone provide a discussion of the complexities involved providing mid-span PoE on a GbE circuit?  I have read the discussion on this topic a couple of times in the CWNA study guide but I am still missing something.  It seems the book indicates it can't be done because all of the copper wires are being used.  Help, and Thanks.

Super Contributor I
Posts: 269
Registered: ‎04-04-2014

Re: PoE on GbE circuits

 

The last time I looked, midspan power injection on GB links is not standardized.  However it is not technically a standard violation to manufacture an ethernet bridge that terminates the GE segments and applies power as an endspan.  I suspect that is what the GE midspan poe "injectors" that are available on the market and claim to be "compliant" are doing.

 

 

Guru Elite
Posts: 20,812
Registered: ‎03-29-2007

Re: PoE on GbE circuits


Rquinn wrote:

Would someone provide a discussion of the complexities involved providing mid-span PoE on a GbE circuit?  I have read the discussion on this topic a couple of times in the CWNA study guide but I am still missing something.  It seems the book indicates it can't be done because all of the copper wires are being used.  Help, and Thanks.


When you say complexities, what do you mean?  There are products that do this today:  http://www.microsemi.com/products/poe-systems/single-port-midspans

 

Unless I am misunderstanding you...



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Anonymous
Posts: 0

Re: PoE on GbE circuits

[ Edited ]

Here is the statement I am trying to understand:

 GbE_PoE.png

Notice on line two where the sentence begins with "1000BaseT devices".  This is from Chapter 17 (PoE) of the CWNA study guide (PW0-104).

Guru Elite
Posts: 20,812
Registered: ‎03-29-2007

Re: PoE on GbE circuits

Hey...ask CWNP what they mean!



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

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