Network timing reference for an integrated services hub

Details Network timing reference for an integrated services hub Network timing reference for an integrated services hub

2006-09-12

2006-09-12

Pezzlo, John (Department: 2616)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C370S369000, C375S222000, C375S294000

Reexamination Certificate

active

07106759

ABSTRACT:
A method and apparatus for synchronizing the sampling rate of digital cells in an integrated services hub. A timing signal is extracted from an asymmetric digital subscriber line. A phase-locked loop modifies the frequency of the extracted signal and generates an adjusted timing signal. The frequency of the adjusted timing signal is compared to a predetermined value. If the frequency of the adjusted timing signal falls within a predetermined range around the predetermined value, the adjusted timing signal is used to synchronize the rate of data transfer. Otherwise, a fallback timing signal is used for synchronization. When the fallback timing signal is used, the synchronization can be improved through the use of a buffering system in which the data transfer rate is adjusted based on the amount of data in a buffer block.

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