[Asterisk-Users] Power Over Ethernet for *any* ethernet switch (or hub); product idea

[Ken Alker]

Based on several threads I've read on this list, I assume that it would be 
handy to supply POE (power over ethernet) in an environment without having 
to purchase POE switches (assumed expensive) and abandon one's existing 
(familiar/custom/not-yet-expensed/etc.) switches/hubs.

Assume I have a non-POE switch with 24 RJ-45 (ethernet) ports.  I design a 
1U box that can be mounted just above/below the non-POE switch, call it a 
"POEI" (POE inserter).  This box has 48 RJ-45 ports, 24 "inputs" and 24 
"outputs".  The end user removes all the ethernet cables connected to the 
existing switch and moves them to the "outputs" of the POEI.  Next, the end 
user takes six-inch long ethernet cables and connects each (now vacant) 
port of the existing switch to the "inputs" of the POEI.

The POEI simply connects the four ethernet signals on each of its "inputs" 
(pins 1,2,3,6 on each) to the same pins on its corresponding "outputs". 
Additionally, it supplies -48VDC (maybe selectable if there are other 
voltage needs) on the appropriate pins (also maybe selectable if different 
vendors use different wiring conventions for POE) of its "outputs".

This could be an inexpensive way to provide POE without having to replace 
all of one's switches.  Additionally, this could be a nifty business 
opportunity.

Are POE switches expensive enough to warrant manufacturing above?
If not, is there a case for not having to swap out all of ones existing 
switches?

Does something like this already exist for cheap?
If so, is it any good?
If so, does it need more features?

If not, would you buy something like this?
If so, what features have I missed?
If so, what is it worth?

Daydreaming, as usual.

Ken