BT A/B wires

[M.Joshi]

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

 

[Rich Webb]

On Tue, 3 Apr 2012 14:51:14 +0000, M.Joshi
<M.Joshi.9c10f48@diybanter.com> 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

 

[Arfa Daily]

"M.Joshi" <M.Joshi.9c10f48@diybanter.com> wrote in message
news:M.Joshi.9c10f48@diybanter.com...

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

 

[M.Joshi]

Rich Webb;2837007 Wrote:

On Tue, 3 Apr 2012 14:51:14 +0000, M.Joshi
M.Joshi.9c10f48@diybanter.com 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 respec
to
the "B" line.

--
Rich Webb Norfolk, VA

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


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M.Joshi