If you're getting phone lines
from a box of some type it's possible that you're reading this
because your phone system isn't working right on that box - even if it worked fine on
the old real phone lines or
a box from a different provider.
You usually can't hear
data noise. It's on frequencies above voice frequencies.
But the computer(s) inside the phone equipment (all
phone equipment is a computer these days), like single line
feature phones, modems and KSU-less phones that don't
need a central box to work, can sometimes hear the data
noise and do strange things.
What strange things?
It will be different with every piece of phone equipment
that's susceptible to the noise. It just causes the
computer(s) inside the phone equipment to operate
The company who made the
phone equipment didn't test to see what their equipment
would do if there was garbage above voice frequencies,
because there never has been garbage over voice frequencies
on real copper phone lines.
How do you know data
noise is causing the problems? You don't. Until you
put one of our Data Noise Filters
in-front of the phone equipment to see if the problems
You can't hear, taste or
smell the data noise. You can see it on an
oscilloscope, but that's not easily hooked up in the field.
The Data noise is common mode
noise. That means it's the same on the tip as the ring. So
if you were to plug a standard single line phone into the
jack on the fake phone line box you won't hear the noise
- It's at too high a
- The noise is
probably the same on each wire (tip and ring, called common mode), you couldn't hear it.
Once you plug the fake phone
line into your telephone equipment, that's plugged into the
wall, there's now a difference between the noise on the tip
and ring because the phone equipment has a reference to
ground through the AC power. You still probably can't hear the noise,
but the phone equipment may hear it and it may be causing
the computer in the phone equipment to do strange things.
The easiest thing to do is
plug a Data Noise Filter
in-series with each phone line coming from the fake phone
line box. If you're a technician you
should definitely carry both the
Data Noise Filter and
the Data Noise Filer+ with you, so you can
diagnosis the problem.
We now have two versions of
the Data Noise Filter...
the Regular and
+ versions. Which one do
you need? I don't know! They use
slightly different technology, and the
Data Noise Filter+ blocks
out lower frequencies of data noise.
You need to
carry them both!
There's no way
to know which one will work until you try.
an exact science since all of the makes and models
of the boxes that provide fake phone lines work differently.
Data Noise can be coming down
all of the lines...
If you put a
Data Noise Filter on
just one line but have the other lines connected
without the Data Noise Filter,
that may let enough garbage into the system on the other
lines (without the Filters)
to cause strange stuff.
If you disconnect all the
other lines and put the Data
Noise Filter on the remaining connected line,
that would be a valid test to see if the strange stuff
stops. You can move the filter to other lines as a test,
making sure you disconnect any lines that don't have a
Data Noise Filter on
them during testing.
Sometimes the more lines that
are connected to the phone equipment from the fake phone
line box, the more data noise is sent into the system. You
may not have a problem when one or two lines are connected,
but you'll have problems when one more line is added because
the data noise is over the threshold that causes the
computer in the phone equipment to go nuts.
Sometimes a particular phone
line (like just Line 1) will bring the data noise into the
phone equipment, and other lines won't. It depends how close
the components or even the traces on a circuit board are to
the components or traces going to the CPU.
AT&T / Avaya has had problems
with their equipment being susceptible to data noise on
their stuff for years. In the old days they sold the 90A
Attenuator. It was basically the same as our
Data Noise Filter,
except our Data Noise Filters
do a better job attenuating the data noise.
The 90A Attenuator
came with a goofy cord. We can make you a 90A Attenuator
if you want one, but because of the goofy cord it's a little
more expensive than the Data Noise
Filters. I can't think of any reason for you to
buy that instead of one of the two types of
phones that you'd buy in the Office-Biggie or Biggie-Mart
store like Panasonic, AT&T (which is really V-Tech), RCA /
GE and other multi-line phones (2 or more lines) that don't
need a phone system central box (KSU) to work together
really don't like Data Noise on Line 1. The
lights or intercom won't work, the phones many not ring, or
some other symptom may occur.
Cordless phones generally
aren't effected because they communicate with each other by
radio - not on the wire from the fake phone line.
actually generate and use their own data on Line 1
above voice frequencies, so you can't
put a Data Noise Filter
right at the phone on Line 1 (the line that's normally used
to communicate between phones). If you do the lights,
intercom and ringing will no longer work between the phones.
BUT, that's the
same symptom you'll get from connecting the KSU-less
phone's Line 1 to a fake phone line box that puts out
Data Noise. The Data Noise from the fake phone line box
interferes with the real data being used to communicate
between the KSU-less phones. So the features are
intermittent or don't work at all.
With these types of phones it's critical that you only plug the
Data Noise Filter in
at the box with the fake phone line,
behind the phone or at the wall jack for the phone.
If you put the Data Noise Filter
anywhere between any of the
phones, particularly on the first line, it will block the
communications between the phones. Putting it right at the box will
make sure it's not between any of the phones.
Which of the two
versions of Data
Noise Filters do
you need for KSU-less Phones?
There's no way to know until you try one of them to see if
it clears your problem.
You really need
to carry at least one of each in your car or truck!
Click HERE to go to our
Data Noise Filter Page