Pulse or digital communications – Testing
Patent
1996-01-25
1998-06-09
Chin, Wellington
Pulse or digital communications
Testing
375222, 370289, 379406, 379407, H04B 346
Patent
active
057646945
ABSTRACT:
A testing and evaluation system for efficiently qualifying individual components of a modem. A modem data pump acts as a dBm meter by measuring distortion, noise floor, and echo. The modem is coupled to a computer and a remote modem. After calibration, the remote modem may be disconnected. A resistor having a preselected resistance is coupled to the modem to allow the computer to measure the modem noise floor and distortion independent of particular telephone connections. An echo canceler coupled to the receive line allows the sum distortion and noise to be measured.
REFERENCES:
patent: 5008923 (1991-04-01), Kitamura
patent: 5359656 (1994-10-01), Kim
patent: 5408614 (1995-04-01), Thornton et al.
patent: 5512898 (1996-04-01), Norsworthy
patent: 5579305 (1996-11-01), Norrell et al.
patent: 5644594 (1997-07-01), Johnson et al.
patent: 5659581 (1997-08-01), Betts et al.
Brent Jason B.
Rahamim Raphael
Chin Wellington
Cray William C.
Oh Susie H.
Rockwell International Corporation
Tran Congvan
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