Phone Systems

Previous Thread
Next Thread
Print Thread
Rate Thread
#430040 09/12/07 05:04 AM
Joined: Sep 2006
Posts: 132
jettech Offline OP
OP Offline
Joined: Sep 2006
Posts: 132
I have a customer with a door phone that has been working for over a year and now is playing up it seems to get a bad feed back type noises form the door phone once a call has been hung up at the station end and it doesn’t ring properly through the door phone speaker when pressed.

The DPIM was installed in the Comms Rack and the door station was installed about 20 metres away over cat6 cable. So I tried hooking up the DPIM out at the door location to see if it was an interference issue as the application note says install DPIM as close as possible to door phone this worked better but still not perfectly.

One observation was if I was to put my finger on the P- terminal the thing would work faultlessly weather the DPIM was in the cabinet or at the door location.

So then I decided to take the DPIM and plug it into my system and it works fine here.

So I can only put it down to an interference issue at the customer’s site there is a lot of X10 power line control that may be causing the issues. Are there any other things / or additional grounding that can be done to overcome these sorts of problems?

#430041 09/12/07 08:35 PM
Joined: Sep 2006
Posts: 530
Joined: Sep 2006
Posts: 530
I've seen problems that are close to this. It turned out that there was a hole drilled in a metal door frame and one of the wires was nicked.

Samsung Dealer
#430042 09/13/07 06:21 AM
Joined: Jan 2007
Posts: 197
Joined: Jan 2007
Posts: 197
Had this a few times, definately local interference.
As Cracker said, check for new metal door/window frames close by. new high voltage cables etc.

Moderated by  Genesiscomm, nameless, pvj 

Link Copied to Clipboard
Advertising Sponsor
Most Recent 5 Post
Old Equipment Plan
by MarkAtLMFJ - 03/05/21 04:41 PM
OS 7400 OAS
by John807 - 03/05/21 04:21 PM
Pair location
by backenhiemer - 03/05/21 10:44 AM
Coaxial Cable
by dexman - 03/04/21 03:53 AM
Netlink or CCIS
by Yoda - 03/02/21 02:32 PM
Popular Topics (Views)
Forum Statistics
Most Online5,661
May 23rd, 2018
Today's Birthdays
ciccotelli, esinoob, Michael M
Newest Members
Sam Juniper, B Ledford, Jonie4, James Wright, TechnoloJay
49,425 Registered Users
Get Tech Support Now! Click the banner below
Get Tech Support Now!
EMP & Lightning Home Surge Protection
EMP - Click Here!
Top Posters (30 Days)
dexman 28
Ruben 24
pvj 11
Linked Banner to your Product or Website
EMP Shield for Commercial - Home & Vehicle
Use Coupon code SAVE - Click Here!
Who's Online Now
20 members (sundance, EV607797, backenhiemer, newtecky, Coral Tech, hbiss, nortelvoip, justbill, dexman, Bob3470, kjwiewall, jeffmoss26, PortlandTech, Touch Tone Tommy, Mercenary Roadie, Professor Shadow, nfcphoneman, JBean3329, Ruben, hitechcomm), 174 guests, and 40 robots.
Key: Admin, Global Mod, Mod
Custom Island 58
Contact Us | Telephone System Tech Support | Terms of Service

Sundance Communications is not affiliated with any of the above manufacturers.
©Copyright Sundance Communications 1998-2021
Trusted Partners