Method and apparatus for measuring quality of upstream...

Details Method and apparatus for measuring quality of upstream... Method and apparatus for measuring quality of upstream...

2005-05-17

2005-05-17

Bocure, Tesfaldet (Department: 2631)

Pulse or digital communications

Testing

C375S257000, C370S459000, C725S111000

Reexamination Certificate

active

06895043

ABSTRACT:
A media access control (MAC) unit in a CMTS assigns a normal time slot to a cable modem being tested for its upstream transmission quality. An FFT generator or engine operating in conjunction with the CMTS is informed of this normal time slot. A dummy time slot, not assigned to any cable modem, is created and the FFT generator is informed of the dummy time slot. A number of FFT measurements of the upstream channel are generated during the normal time slot and during the dummy time slot. FFT measurements of the upstream spectrum taken during the normal time slot are compared to FFT measurements taken during the dummy time slot. Through this comparison, undesirable noise spurs, if any, can be detected in the upstream spectrum caused by the cable modem being tested.

REFERENCES:
patent: 5832032 (1998-11-01), Overbury
patent: 5862451 (1999-01-01), Grau et al.
patent: 5926479 (1999-07-01), Baran
patent: 5943604 (1999-08-01), Chen et al.
patent: 6141317 (2000-10-01), Marchok et al.
patent: 6574797 (2003-06-01), Naegeli et al.

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