sundance-communications.com/forum Forums Computers & Programming Computers, Software, Accessories dsl filter

hello guys i got stumped today. customer has a dsl line that works fine. they also have a stand alone phone on the same line. they have a filter but jit gets static. when i take the line out of the dsl modem the static goes away. they have a filter one it and i tried 3 filters i had with me and nothing seemed to help. any ideas. thanks dave

Tried 3 filters....but did you plug one into each other then into the jack? May be so close to CO that it's a hot line.

no i put them on one at a time. but i had the one the customer had at the jack and then put mine on by the phone. i could try putting a few on to see what happens. nothing to loose. thanks dave

no that didnt do the trick. a friend said it could be the modem but i dont know how to test it. it is a verizon modem. dave

I see this all the time. A less than perfect joint somewhere between the CO and the customer, or a bad joint or modular plug within the customer premises can rectify some of the DSL signal, resulting in noise down in the voice band. The filter does nothing to stop it, because the noise is within the freq. range that the filter is designed to pass.

Electronic phones can also be much more sensitive about noise in general...

These can be some of the most difficult problems to solve. Try connecting the modem directly to the demarc, after disconnecting all customer wiring. Let it sync up, then clip on your butt set, draw dial tone, and listen for noise. If it is quiet, unhook your butt set and hook up the customer's phone, again directly to the demarc.

If you determine the noise to be originating after the demarc, then look for aging modular plugs and/or jacks, etc.

If the source of the noise is within the outside plant, and audible on your butt set, then Verizon might fix it. If it is within the OSP but only audible on the customer's phone, then getting V to fix it may be a lot harder...

Good luck with your endeavors.

Jim
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Speaking from a secure undisclosed location.

What modem is it?

Some of them are more prone to creating interference than the others...

Have you tried different phones on that filter? Same reults?

i did try a differant phone and im not sure what modem it is but i will find out when i go back to put the modem in the phone room. thanks for the ideas. dave

I have a speedstream modem, It causes a HUGE amount of noise on the line. Last month i got fed up, no combination of filters and things could fix the issue. Called MA belle on an unrelated issue (damaged demarc) the tech said "there is a lot of noise on this line, let me put in a DSL switch" since he did that we havnt had a problem, and it was FREE

You might need a whole house filter. I've used those when I worked at a CLEC, mainly at businesses that have devices that call out, like credit card terminals, and such. The inline filters just don't work on those devices.

https://www.homephonewiring.com/splitters.html