Cable modem that can prevent modem signal from transferring...

Details Cable modem that can prevent modem signal from transferring... Cable modem that can prevent modem signal from transferring...

2008-01-01

2008-01-01

Tran, Khanh C. (Department: 2611)

Pulse or digital communications

Transceivers

Modems

Reexamination Certificate

active

07315572

ABSTRACT:
A cable modem includes a CPU for controlling the entire cable modem, a PGC, for generating a modem signal with adjusted intensity, a transformer for isolating the PGC from a next stage, a low pass filter for filtering off a high-frequency component, and a selecting circuit for selectively transferring the output signal form the low pass filter to a network. In particular, the cable modem of the invention is advantageous for preventing an up-stream signal of the cable modem from transferring to an HFC network and for preventing the entire network to be shut down when an internal circuit operates abnormally.

REFERENCES:
patent: 5790806 (1998-08-01), Koperda
patent: 5835125 (1998-11-01), Bhagavath
patent: 6075972 (2000-06-01), Laubach et al.
patent: 6588016 (2003-07-01), Chen et al.
patent: 6622304 (2003-09-01), Carhart
patent: 6662368 (2003-12-01), Cloonan et al.
patent: 6674809 (2004-01-01), Kay
patent: 6895043 (2005-05-01), Naegeli et al.
patent: 7159236 (2007-01-01), Abe et al.

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