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It is likely that you either have a grounded connector, possible pinched between a duct or water pipe or, in a previous life, there may have been a 10 VAC transformer connected for a Trimline or Princess telephone that is connected to the pair on which you are working.

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Until you can determine WHAT TYPE of metallic fault exists, you cannot begin to clear it.

A digital volt-ohm meter costs about ten bucks. And guess what? It's re-usable AND a tax deduction.


Arthur P. Bloom
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Originally Posted by Touch Tone Tommy
If you happen to know the test number to remove CO battery for a minute or two, use your meter on the Telco side too.
Oh such a thing exists? How handy.

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My guess in this instance is that there is an imbalance on the line that isn't present at the NID because it is due to a high-resistance open (faulty splice on one side of the cable pair). That additional bit of inside wiring added to the circuit is just enough to bring out the noise. If it's clear at the NID and not after the inside wiring is connected, you're going to have a hell of a time getting the telco to accept responsibility.


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Well I managed to find a 2nd cross connect block in a store room. The first two pairs have the same buzzing sound. Again switch to another pair; the third pair was a good clear dial tone. So I got the user back up. Still not sure where the fault is at, but every time it rains some phone wire in this building goes south.

Again guys ty for your advice.

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Sounds like an unbalance in the interior wiring. Hopefully it's twisted pair and not quad. If it's quad you'll need to replace it.
Quad is not twisted pair. The other thing that you can look for is bridged taps on that pair (or try another pair or cable).
If it appears to be related to rain, you should replace the cable, really.

Unbalance happens when both conductors aren't the same length electrically (which is usually the same as physically).


Last edited by Joe Talbot; 12/11/19 10:10 PM.
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Analog phones work just fine on quad wire, as do digital phones. I wouldn't be ripping out quad just because.

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