Multiplex communications – Fault recovery – Bypass an inoperative switch or inoperative element of a...
Reexamination Certificate
2008-06-17
2010-11-30
Jung, Min (Department: 2472)
Multiplex communications
Fault recovery
Bypass an inoperative switch or inoperative element of a...
C370S252000, C375S222000
Reexamination Certificate
active
07843810
ABSTRACT:
According to a first aspect, in a time period after a line card switchover, a CMTS router makes each ranging opportunity in a bandwidth allocation map effectively wider by padding mute areas, which no modem can use, before and after a ranging opportunity. This is to keep a ranging packet of one modem from colliding with transmissions from other modems that may have incorrect timing offset after a switchover. According to a second aspect, the CMTS router sends a modem affected by a switchover one or more unsolicited requests to adjust its timing offset in an effort to keep the modem from going offline.
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Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, with International Search Report and Written Opinion attached, issued in PCT/US2009/001270, dated Sep. 30, 2009 (12 pages).
Cisco Technology Inc.
Hamilton Brook Smith & Reynolds P.C.
Jung Min
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