Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate
2005-01-25
2005-01-25
Ho, Duc (Department: 2665)
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
C370S356000, C370S389000, C725S111000
Reexamination Certificate
active
06847635
ABSTRACT:
A method to use the data packet carrying ability of cable TV networks as described in DOCSIS to accurately and quickly transmit a voice call from a cable user to another user over a cable TV cable. The cable telephone, or cable modem, is given the ability to detect when voice activity from the subscriber is above and below a predetermined value. When the cable modem has voice activity, the cable modem knows that it will have a continuous stream of voice data packets which need to be sent very quickly and very accurately to the CMTS. Therefore, the cable modem requests a periodic stream of time slots from the CMTS. When the cable modem detects no voice activity or a silence period from the subscriber, the cable modem indicates that the periodic stream of time slots is no longer needed and the CMTS stops providing the periodic stream of time slots. When voice activity of the subscriber resumes, the cable modem again request the periodic stream of time slots, and transmits the voice data packets or cells in these time slots.
REFERENCES:
patent: 6236653 (2001-05-01), Dalton et al.
patent: 6570855 (2003-05-01), Kung et al.
3Com Corporation
McGlew and Tuttle , P.C.
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