17 Dec
2003
17 Dec
'03
11:17 p.m.
I have heard that tapping high speed modems can be a little tricky because of the adaptive filtering done. The modems both have adaptive filters that adjust to the line as they see it. If you are tapping at some other point the filtering will not be optimimal for your case. I believe these filters take care of smearing and echos and things of that nature.
Hmm... As part of the tap, introduce just enough distortion or noise to cause the modems to fallback to a slower bit rate. This is somewhat intrusive of course and so it might be noticed, but it could make taping a line much cheaper. brad