atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services Cabling Telephones Systems Wiring buzzing induced on analog phone system

It's not 60cycle - i delt with that crap when i played in a band and had to chase down ground loops and other annoying noise in the guitar amps.
Will try all that is suggested - we got 70inches of snow on the ground here where i live so i doubt i will be doing the trace walk until next June!

I'm guessing that the original loop doesn't like the extra 600-700 feet of cable tied to it. It gives you a chance for an extra antenna. Try connecting only the remote building to the line and listen for background noise. If it goes away, your solution might be a small phone system where you are feeding an extension to the remote building.

For fun, you could do some research on bridge lifters here

In the C.O. days, we used to use them on party lines. It was great for hanging 4 separate cables on the same line, or an answering service to the customer's main number. Bridge lifters are probably made of unobtainium, but somewhere I have a single unit that weighs a lot and does such a feature. It may show up in the next 2 months.


Carl

So, what happens when you kill the power to the outbuilding? I can tell you from experience AC power induction isn't always a 60hz hum, I've heard buzzing, clicking and different harmonics on induction. It was a pretty big issue in the sandhills as you can't always get a good ground.

i tried grounding the un-used pairs - no difference - just a low level buzz/hum that is audible on both ends of the conversation. I will try killing the power in the out building next.

What would a guy recommend for getting phone signal to out building 600ft away?

Did you also ground the shield?

Let's find out what the problem is first. POTS travels for miles on twisted pairs without problems. I assume you are connected directly to the POTS terminals of a cable modem or similar and not a copper POTS line from the phone company? My thinking is that the line is not properly balanced to which you are connected. Wouldn't surprise me with a cable modem.

-Hal

That's a good point to mention, Hal. It is true that output ports on IADs, VoIP ATAs, EMTAs and other telephony toys are often used to emulate a real POTS line, but they often don't work.

I had an installation that called for the reuse of a pair in an existing 300 pair aerial cable to send a POTS line from an EMTA. This pair had carried a digital station on a Nortel system to a regular jack. It didn't take long to determine that Spectrum Cable's Arris EMTA lacked the horsepower to push clean dial tone that far. We obtained Viking Electronics' TBB-1B, which is a great per-line device that was developed specifically for these situations. Of course, you will need one per line.

HERE IS THE LINK FOR IT.

Well done, Ed!

Sam