see if there is any residual of 8 kHz harmonics. My lines are analogic,
but
in the central exchange they are, by sure, digitized at 8kHz rate... some
digital
buzz may leak out.
The problem may be from Digital multi line systems. The trend is to
unload
phone lines and replace analog cxr systems with a system that operates
at 56 K. This allows for 2 good voice grade lines on one cable pair. This
is a better deal for the TELCOs than running additional cables .They
recommend
locally to keep these systems out of the same sheath as other digital
systems.
They can cause mutual interference.
However there should be little leaking outside of the main multi cable.
Make sure that you dont have anyone calling you when the phone line is
connected to
your computer as ring voltages can be as high at 140 volts AC
I am on such a system and have no problems other than a limit of 26 K.. I
net access
Bob K3DJC
| 