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Posted by Carl Navarro on February 5, 2007, 10:14 pm
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wrote:
>Does anyone know how to use a tester? I bought the Turbo Tone. It has
>instructions, but I guess I don't understand them too well. I have a
>phone line with 4 pairs. I don't know which pair is active. I just
>want the device to tell me which is active. I see "NRM" and "REV". I
>suppose that stands for Normal and Reversed. Other than that I can't
>get something basic like is the line active or not?
There is some sort of mathematical formula to figuring this out. As
was suggested you ought to RTFM. If there is an active line in the
cable, you can find it with your tongue, a meter, or the tester
clipped to earth ground. Since an active line usually has -48 volts
on the Ring and Ground on the tip, you can ground your tester/body and
touch each of the 8 wires until the tester lights up or you taste the
battery.
With any luck, the mate of the cable completes the pair.
Of course a Butt set would have done the same thing and you could just
listen for dial tone..
Normally we're talking Blue/White as the Ring and White/Blue as the
Tip.
Carl Navarro
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