[cisco-voip] Radio CrossTalk

[Jeff Garvas]

Do you hear this radio signal if you plug a regular phone into the POTs
lines?

It seems very unlikely that you're getting RFI from a tower a mile away.
What type of radio signal is it?  Broadcast AM/FM ?



On Thu, Oct 22, 2009 at 3:26 PM, STEVEN CASPER <SCASPER at mtb.com> wrote:

>  A couple of days ago, we implemented IPT at a site that was previously
> using a Norstar system.  After conversion to IPT, the site has been
> experiencing radio across all their phone lines that terminate to an FXO
> card in a 2811.  There is a radio tower approximately 1 mile away from the
> branch.  We have taken the following actions to try to resolve this issue.
>
> From the Dmarc, we validated no radio was coming into the branch.
>
> We eliminated any bridge taps and created straight run (Cat5 cables) from
> the Dmarc to the router FXO ports.
>
> We added ground wire from the router to a nearby water pipe.
>
> We went through each phone line and eliminated the thought of one of the
> lines causing the issue.
> Does anyone have any other suggestions that we can try?  Interesting that
> we did not experience this problem on the Norstar.
>
> Steve
>
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