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| Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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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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#2
Posted to sci.electronics.repair
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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 |
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#3
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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 |
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#4
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