Re: phone line noise

>     I have a hum on the phone line. Verizon has been out several times,
and
> found no problem. The hum is affecting incoming voice quality, and the
> answering machine recording is poor. They did AC voltage, stress test, DC
> volts and leakage test. All were "clean". I plugged in different phones at
> the NID, and hum was still there.(they say they don't here it)
>     After unplugging different wires and phones, I noticed the same hum
was
> coming from the computer speakers.
>     If I unplug the phone wire from the back of the computer, the hum is
> gone from the computer speakers, but not from the phone line.
>     All this tells me that the hum is on the phone line itself and causing
> interference.
>     My question is what is the tel co missing. I have DSL, but the noise
was
> there before. That hum from the computer speakers was also there for a
long
> time, but I did not relate it to the phone line. It seems The digital
> answering machine is more sensitive to the hum than an answering mach with
> tape.
>     Also, if I do a memo recording on the phone without the phone line
> connected, the recording is OK; plug the line back in, and the recording
is
> poor.
>
>     Thanks for any ideas!!

Have you had your house electrical wiring checked?  To me, this sounds like
a house that is improperly grounded (floating ground?).  Thus, audio through
your phone devices is distorted by unclean local power.  It would explain
why the phone company found nothing wrong.  It would also explain why there
is no noise without the phone line connected.  (if "ground" is
different/correct on the phone line, the noise could be a product of mixing
with the "ground" of your electrical devices, but only when a phone line is
connected to an electrical device)  Another way of looking at it . . . if
the phone line power is clean (likely) and your house power is not
(possible?), every device in your home might work OK until a phone line is
plugged into it.  If the hum is low in frequency, this would further
reinforce my suspician that there might be something wrong with the
electrical wiring, not the phone wiring.  Good luck,  -Dave