Cable plant certification procedure using cable modems

Details Cable plant certification procedure using cable modems Cable plant certification procedure using cable modems

2007-07-17

2007-07-17

Kelley, Chris (Department: 2623)

Interactive video distribution systems

Video distribution system with upstream communication

Having link to external network

C725S107000, C370S241000

Reexamination Certificate

active

09493405

ABSTRACT:
A system for testing a cable network during normal operation interleaves test signals with live data traffic. Installed cable modems are used to generate the test signals. During live communication, such modems send upstream data at allotted time periods. Periodically, there are time slots when no modem is transmitting on the network. During these times, specific modems may be directed to transmit specific test signals. A controller such as a cable modem termination system directs specific modems to transmit signals at defined frequencies and powers during specific time slots. In this manner, the system can monitor the frequency response of the cable network at various locations, and thereby determine “on-the-fly” when maintenance or modification is required.

REFERENCES:
patent: 5862451 (1999-01-01), Grau et al.
patent: 5939887 (1999-08-01), Schmidt et al.
patent: 5943604 (1999-08-01), Chen et al.
patent: 6772437 (2004-08-01), Cooper et al.
Data-Over-Cable Service Interface Specifications, SP-RFI-I05-991105.

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