The quality of DSL phone line filters

6 replies [Last post]
Offline
Joined: Dec 19 2003
Posts: 832

I've recently had a few downs and ups, experience wise with DSL filters and thought that I'd share what I'd learned. Basically, the basic low end ones don't eliminate much of the audible line noise/RF interference. I've been working with DSL connections, over AT&T lines (formerly SBC, Hey! What ever happened to the anti-trust/AT&T/Bell Telephone/break-up ?!?!) and Earthlink.

Earthlink is generally alright to deal with, not great. However, an AT&T employee/friend of the family clued me in the that the filters that they sent with the installation kit is sub-par. Seeing what he installed, I contacted the web-store from that company (Excelsus), and bought the even higher end, RFI elimating version of the filters, installed them, and things cleared right up, and the voice signal even seemed to be stronger than before any of this installation activity. The model of the filters that I went for are Z-275P2J, and I strongly recommend it. BTW I'm running a wireless LAN at 1.2 Mhz and some wireless phones at the same frequency which I understand can cause some interference, but the new filters took care of that issue.

Mutant_Pie

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.
Dr. Webster's picture
Offline
Joined: Dec 19 2003
Posts: 1687
Re: The quality of DSL phone line filters

mutant_pie wrote:

BTW I'm running a wireless LAN at 1.2 Mhz...

Say what?

__________________

Applefritter Admin

Offline
Joined: Feb 23 2005
Posts: 233
Filters are for voice...Right?

You know that the filters are to keep the DSL signal OUT of the voice lines, not to decrease the noise on the line, right?

coius's picture
Offline
Joined: Aug 25 2004
Posts: 1975
Re: The quality of DSL phone line filters

Dr. Webster wrote:
mutant_pie wrote:

BTW I'm running a wireless LAN at 1.2 Mhz...

Say what?

I think that is supposed to be "GHz"

__________________

See my PB540c 33Mhz serve a website! http://yui-ikari.coius.info/

gobabushka's picture
Offline
Joined: Apr 26 2004
Posts: 494
DSL is sent on the same line

DSL is sent on the same line as voice, just a different frequency, much higher than we can hear. So it could help with voice quality.

__________________

"I reject your reality and substute my own!!!" -Adam Savage, MythBusters

moosemanmoo's picture
Offline
Joined: Aug 17 2004
Posts: 686
For the record, WiFi and many

For the record, WiFi and many portable phones use the 2.4GHz spectrum.
IIRC, DSL is above 200 KHz, a range that nobody could ever hear.

__________________

Join the chat on irc.freenode.com, channel #applefritter.

Offline
Joined: Dec 19 2003
Posts: 832
Corrections mostly correct. . .

The frequency of the LAN is 2.4 Ghz. However the new filters that I installed not only block the DSL signal, they also clear out some Radio Frequency Interference (RFI).

Fast typing + waking up too early on a Saturday = erroneous info posted.

Mutant_Pie