[cisco-voip] ATA-187 and Ground? (Jason Aarons (AM))

[Mike King]

One more thing.  Check your Lightening protection fuses/breakers.  I've had
some that were faulty, and gave inconsistent results.  But I think you're
on the correct path of bad cable plant.


On Sat, Aug 24, 2013 at 3:56 PM, Jerry Ridge <jridge76 at hotmail.com> wrote:

> It could be that you have a resistive short on the wire.  You can test for
> that with a meter or toner. If you notice a toner will
> short and the tone will stop, or the light on the toner may glow dim. It's
> a dumb test but quick and dirty. It may be the tone will be muted still
> there but at a low volume.
>
> The other thing that could cause this is capacitance on the wire. The only
> way I have seen that removed is with something called a load pot, which is
> a coil to ground.
>
> It could be your wire is in water and needs to be direct burial type of
> wire or jelly filled.
>
> If you had a ground on the line you would hear a hum. If you have a bad
> ground at the power suppy or a bad filter in the power supply you will hear
> a hum.
>
> The way to test for capacitance is with an analog meter and when you hook
> it up or revers the leads you will see the meter kick.
>
> You could try replacing the ATA with a known good one and see if the ATA
> is doing it, itself.
>
>
> JeRy
>
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>
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