Multiplex communications – Pathfinding or routing – Through a circuit switch
Reexamination Certificate
2007-10-23
2007-10-23
Jung, Min (Department: 2663)
Multiplex communications
Pathfinding or routing
Through a circuit switch
C370S360000, C370S366000, C370S386000
Reexamination Certificate
active
10176819
ABSTRACT:
The invention provides a method and system for operating a switch, in which incoming data cells are converted from parallel to serial for synchronous input to a switch interconnect, converted from serial to parallel for parallel switching, converted from parallel to serial for synchronous output from the switch interconnect, and converted from serial to parallel for output. The switch interconnect and its input and output interfaces are controlled by a single frequency source, so that all serial data communication paths into and out of the switch interconnect are phase synchronized to within one clock cycle. A single frequency source for the switch system is coupled to the input interfaces, to output interfaces, and to the switch interconnect. The input interfaces each include a PLL which synchronizes to the single frequency source once for all serial communication to the switch interconnect. The switch interconnect includes one PLL for each input interface which synchronizes to the serial input from that input interface, and one PLL for each output interface which synchronizes to the single frequency source once for all serial communication to the output interface. Similarly, the output interfaces each include a PLL which synchronizes to the serial output from the switch interconnect. The switch interconnect is coupled to the single frequency source and operates in phase therewith.
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Epps Garry P.
Laor Michael
Cesari and McKenna LLP
Cisco Technology Inc.
Jung Min
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