Optical communications – Multiplex – Broadcast and distribution system
Reexamination Certificate
2011-07-05
2011-07-05
Bello, Agustin (Department: 2613)
Optical communications
Multiplex
Broadcast and distribution system
C398S154000
Reexamination Certificate
active
07974532
ABSTRACT:
A system and method for management of bandwidth in a fiber optic, ethernet-based, TDMA communications system. A request/grant process is used to control the use of upstream bandwidth. A sense of time must therefore be shared by a headend and remote end-user devices. The invention provides for a gigabit media-independent interface in a media access controller to detect start-of-frame delimiters in incoming data. This allows for synchronization of a headend and end-user devices. The invention also allows for phase locking a transmit bit rate, at a headend, to the headend's clock. Transmitted data can the be used downstream to derive a local clock. Synchronization can also be maintained by the use of synchronization bytes in MPEG frames and/or variable length frames. Efficient bandwidth usage can also be facilitated by the use of maximum data units in allocating bandwidth in unsolicited grants, and by allowing flexible fragmentation and/or prioritization of internet protocol (IP) packets.
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International Search Report for Application No. PCT/US02/21044 mailed Jul. 17, 2003, 8 pgs.
Gummalla Ajay Chandra V.
Pantelias Niki R.
Sala Dolors
Bello Agustin
Broadcom Corporation
Sterne Kessler Goldstein & Fox P.L.L.C.
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