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Question 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.
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Default 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.

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Rich Webb Norfolk, VA
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Default 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.




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M.Joshi


Why ... ?

Arfa

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Arrow

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