Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate
2005-08-31
2010-11-02
Moore, Ian N (Department: 2463)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
C370S432000, C370S420000
Reexamination Certificate
active
07826491
ABSTRACT:
A distributed Cable Modem Termination System (CMTS) includes a head end, a downstream transmitter hub, and a plurality of cable modems that all establish frequency lock with a common frequency reference. The head end transmits a plurality of time stamps from the head end to the plurality of cable modems via a packet data network, the downstream transmitter hub, and cable modem network plant. Each of the plurality of cable modems performs smoothing operations on the plurality of time stamps to establish phase lock with the head end. The downstream transmitter and the plurality of cable modems perform ranging operations to establish phase lock among the plurality of cable modems. In an alternate operation, the frequency reference includes marker sequences that the devices of the distributed CMTS use to establish phase lock.
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Broadcom Corporation
Garlick Bruce E.
Garlick & Harrison & Markison
Moore Ian N
Short Shayne X.
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