BT A/B wires
 

How can I identify which is the A and B wire coming in from outside?

There is no earth wire supplied.

BT A/B wires
 

On Tue, 3 Apr 2012 14:51:14 +0000, M.Joshi
wrote:


How can I identify which is the A and B wire coming in from outside?

There is no earth wire supplied.

Assuming it's RS-422, when idle the "A" line is negative with respect to
the "B" line.

--
Rich Webb Norfolk, VA

BT A/B wires
 

"M.Joshi" wrote in message
...

How can I identify which is the A and B wire coming in from outside?

There is no earth wire supplied.




--
M.Joshi


Why ... ?

Arfa

Ah no, I was referring to UK telephone line A/B wires. BT - British Telecom.