[cisco-voip] Radio CrossTalk

[Truelove_John]

I had same problem several years back.  I fixed the problem by putting
line filters on each phone.

Major pain and expense.  Radio waves were coming into lines from cables
in ceiling.   The cable was not shielded and I

even tried grounding each stations lines, it helped a little but didn't
fix the problem. 

Try line filters on lines going into FXO ports.

John

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of STEVEN CASPER
Sent: Thursday, October 22, 2009 3:27 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Radio CrossTalk

 

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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