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US 7,602,811 B2Granted
Synchronization in a communication system
AssigneeCambridge Broadband Limited
InventorsJohn David Porter, Benedict Russell Freeman
Life of this patent
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AssigneeCambridge Broadband Limited
InventorsJohn David Porter, Benedict Russell Freeman
Estimating the term…
A packet switched communications system and method for transmitting synchronous data from a source module (4) to a terminating module (8) over a network comprising plurality of modules (4, 5, 7, 8) interconnected via transmission links (2, 6, 9). Each module operates with a clock of nominal frequency that is not synchronized with the clocks of the other module(s) and has a single input and one or more outputs. The method includes determining the phase difference between the input clock and the output clock of each module, and transmitting the phase difference to the terminating module (8) in the network. The received accumulated phase difference at the terminating module (8) is used to lock the output clock at the terminating module to the input clock at the source module.
A packet switched communications system for transmitting synchronous data from a source module to a terminating module over a network, the network comprising plurality of modules interconnected via transmission links, each module the network having a clock of nominal frequency that is not synchronized with the clocks of the other module(s) in the network and having a single input and one or more outputs where all the outputs of each module are phase locked to each other but are not synchronized with respect to the input, means for determining an accumulated phase difference between an input clock and an output clock of each module, means for transmitting the accumulated phase difference to the terminating module, and means for utilizing the received accumulated phase difference at the terminating module to lock an output clock at the terminating module to an input clock at the source module.
A method of recovering clock signals in a packet switched communications network, the network comprising a plurality of modules interconnected via transmission links, each module having a clock of nominal frequency that is not synchronized with the clocks of the other module(s), each module having a single input and one or more outputs, wherein all the outputs of each module are phase locked to each other but are not synchronized with the input, the method comprising the steps of:
Dependencies are inferred from the claim text.