RE: Cat 5 Pinouts

["Keith Doxey" <ukha@xxxxxxx>]

I always use 7&8 for power feeding sometimes in conjunction with the
Green
pair.

eg.

WHITE/Brown = 0V
BROWN/White = +12V

or

WHITE/Brown = -12V
BROWN/White = +12V
GREEN/White = 0V

Some ISDN connectors actually have 48V on the brown pair so I think
anything
that was in anyway sensitive to voltage would avoid the 4th pair.

For your application I would have

WHITE/Brown = 0V
BROWN/White = +12V
BLUE/White = Signal.

That avoids pairs 2 & 3 which are used for ethernet. Phone will not be
damaged by the output of your circuit.

Fit the lowest possible fuse you can to the output of your PSU just to be
on
the safe side.

Keith

-----Original Message-----
From: Robert Chasmer [mailto:robert.chasmer@xxxxxxx]
Sent: 14 February 2002 16:17
To: 'ukha_d@xxxxxxx'
Subject: [ukha_d] Cat 5 Pinouts


Could anyone recommend a safe RJ45 pinout to use for distributing 12v.
Basically I want to connect Nigel's IR circuit up via my patch pannel,
which
means I need 3 wires:-
1) +12v
2) 0v
3) Signal

I want to avoid any problems if I accidently patched the IR box to either
my
Hub or Telephone points.

I've found a number of guides describing what is used for a network and
even
a BT patch:-
* http://www.cpe.surrey.ac.uk/support/utp.htm

* http://www.rogerssystems.com/store/tech/how-to-cat5.cfm

*
http://www.bluemax.net/techtips/networking/Wiring_Tips/Wiring100TX/colorcode
standards.htm

Based on these I think the following pins are used (please correct me)
(1) Network(Tx+)
(2) Network(Tx-)
(3) Network(Rx+)
(4) BT(Line-A)
(5) BT(Line-B)
(6) Network(Rx-), BT(Bell)
(7)
(8)

This leaves me to believe I could use pins 7 & 8 safely, but I need one
more.  I wired up my patch pannel for the phone about a year ago, so I
can't
remember what pins I used but I'll check when I get home.

Any ideas?

Also I want to buy some RJ45 / Cat 5 sockets to fit neatly in some small
boxes I'm put the IR boards in.   Anyone know if maplins sell small Cat 5
sockets that I could mount in a small box.


Rob
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