Anybody ever come across this? We provided a cat5 backbone in a resdidence for voice and data as part of a larger project. There is no phone system...just regular old phones. Line 1 at the NID is crystal clear. All the jacks in the house are terminated in the basement on a 110 block. As we punch down the first jack on the 110 block we get a slight buzz on line 1. As we punch down more jacks onto the 110 the buzz grows in intensity until the line is rendered almost useless. We have changed the feed to the NID and punched down all the jacks in varying orders and combinations multiple times. We've got hundreds of installs out there which include voice & data but we've never seen this before. Any ideas?

Is there some interference coming in from another device or system within close proximity?

If you can identify possible sources try to eliminate them 1 by 1.

Just a shot in the dark.Hope this helps.

Ground unused pairs on each of the extensions?

The interference thing is what I've been contemplating but I didn't want to cloud the question. I'm thinking that as I add more jacks I'm adding more linear feet of cat5 and increasing the size of my "antenna" picking up the interference. The only problem is that line 2 which is terminated on the same block and travels over the same cat5 remains crystal clear. I actually used the trick of tuning an AM radio down into the low AM bands and wandering the house. This will usually pick up noisy motors and such. Nothing was out of the ordinary. That is, if you can get within 3 or 4 feet of the motor without the radio getting extremely noisy then that motor is likely not the culprit. I just don't know.

Are there any DSS receivers in the house that are attached to CO1? We've got a similar situation with a house that we recently completed where the DSS receivers render whatever line they are connected to very noisy. Even routing the DSS receivers through a line switching device (CommSwitch) has not solved the problem. This house has RCA DRD480RH receivers. I've never run into this issue on other models of receivers.

Brad

DSL?? T1 or other data?

You might also try connecting all your extenions, then removing them one by one...starting with number one, as it's the one that starts the buzzing...

One other thing...do you have a security system with line seizure connected? If so...disconnect it completley, and then continue if the problem persists...if you're using a pre-built punch down block that has dip switches to activate/de-activate such a feature, check that too...

good luck

avdude

That's too weird...All 4 DSS receivers are RCA DRD480s...I don't know what the heck that means but I'll remove them from Line 1 and see if that helps...Thanks for the clue big time.

I'll check RJ31 on security as well...not sure if guys did this yet. I'll let you know what we discover. Thanks.

What fixed it at my house 8 years ago (before I started doing phone systems) was putting one of those "network interface" blocks on each incoming line. It looks like a surface mount connecting block with the little circular door that slides over the RJ11 jack to keep it in place. I think it's called a "half-ringer".

Nowadays it's in the form of a module inside the grey box they put on the side of your house, half of which is "locked" for phone co. access.

Doug @ HomeWorks

This message was edited by deb1919 on 06/04/04 18:06.

we saw this alot when the sony SAT-B65s rolled out. Try putting 9V power supply on the line. The model we use is a PS2R. Its specifically designed to boost voltage on a phone line.

JT, is this a retro job? Older phone wiring already in place with some jacks daisy-chained? When you say "punch down the first jack", is this any jack that you pick at random, or is it a specific jack? Are the jacks all new? Did this problem exist before new stuff was added? Is the NID a bonafide NID, or an old block with metal studs? I've spent some time slogging around phones; this is interesting. I'll check back tomorrow, but meantime look for two possibilities (along with all other suggestions so far): a long piece of silver satin being used for an extension that was run by the homeowner, then closely inspect the pins in all the jacks. Make sure there are no pins out of place, touching each other.
Jeff
Jeff

P.S. regarding
Jeff
Jeff
I have not cloned myself; there is still only one of me. It's been an 18.5 hour day.
(The original) Jeff