Interference on Analogue phones?

[yriou]

Hi all,

I have a IP 412 deployed for a while now in a rather long building. A few Avaya analogue extensions are causing me problems, there are interfering noise during calls, not always though.

I tried different handset/port module but nothing solves it. The only common point between the 3-4 extensions is that they are at the opposite side of the building as the IPO412 and in the same area. The lenght of CAT5 is probably about 150 mtrs which seems to be within accetable length to carry analogue calls.

Can something interfere with the calls? Anyone ever experienced this?

Thanks,

 

[tlpeter]

It could be that the cables are running next to powercables
You should check that
150m is not far so that should not be a problem at all

ACA - Implement IP Office
ACS - Implement IP Office
ACA - Voice Services Management
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[robboardman]

what version of software are you using, we had a similar problem with intermittent noise on analog extensions, Avaya provided a PB to fix so you might want to try upgrading first

the POTS units needed 6.0(73405) a 4.07 PB

Robb

 

[tnlcom]

If it's analogue your using it is probably picking up RF interference from a radio station etc. Try moving the phones to different cables or even shorten them by a foot or so and yes make sure they are not running parallel to existing power cables but sometimes this is unavoidable.

If you can plug the phone into the port on the phone system and get no interference it is the length of cable and RF causing the problem and not the software level as Robboardsman has suggested. You can get RF filters to put on the end of the socket nearest the phone. Try changing to a BT analogue phone these are usually better prtected against RF than other manufacturers. Long lines can often cause this problem.

Failing that upgrade it to digital phones!

 

[yriou]

Great advices there guys, will try all this tomorrow!

 

[Westi]

If you have straight cat 5 cables from one end to the other then you can ground the remaining pairs on BOTH ends and it acts as a shield and will help with EMI problems

Joe W.

FHandw., ACA, ACS

If you can't be good, be good at it!