Nortel Networks Corporation

Glenn Eng

John Cornelius Lynch

Andre M Cyr

Michael Pothier

David Cairns

A system for re-establishing synchrony with data that was synchronous data in a source device but for which synchrony is lost when the data is transmitted over an asynchronous and unreliable medium to a destination device. The system includes buffering of the data received in the destination device from the asynchronous network, readout of the buffers according to a clock, and adjusting the rate of the clock in the destination device according to the rate of transmitting the data from the source device. The clock rate is thus adjusted to re-establish synchrony, and the clock may be used to control synchronous handling of the received data within the destination device.

System and method for synchronizing with data received over an unreliable asynchronous medium

There is no common clock between two system over an asynchronous interface, such as an asynchronous network or bus. The rate of data transmission of constant bit rate data from one system can be considered constant when averaged over time. A receive system can synchronize its system clock by using timing information derived by counting received packets over a predetermined period of time.

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Belleville, Canada

Glenn Eng