Stratus Technologies Bermuda Ltd.

Other

Garth Dylan Wiebe

An apparatus and method for fault-tolerant and spread spectrum clocking. In one embodiment a master clock synthesizer circuit generates an output clock signal of varying frequency within a predetermined range of frequencies. A slave clock synthesizer circuit is provided to track the output clock signal generated by the master clock synthesizer circuit. If the master clock synthesizer circuit fails or generates an invalid output clock signal, the slave clock synthesizer circuit takes over and functions as the master clock synthesizer circuit. In one embodiment a method of fault-tolerant spread spectrum clocking includes generating a first digital data stream; receiving the first digital data stream, a first input reference signal and a first clock signal in a master clock synthesizer circuit; generating an first output clock signal of varying frequency by the master clock synthesizer circuit in response to the first digital data stream and the first clock signal.

Apparatus and method for redundant and spread spectrum clocking

Methods and apparatus for transporting digital audio-related signals over point-to-point, non-circuit-switched, non-packet-based, local area connections. In one example, multiple digital audio-related signals are combined as a time division multiplexed (TDM) serial bit stream. In addition to the one or more multiplexed digital audio-related signals, the TDM serial bit stream also may be encoded with other information that pertains to one or more of the digital audio-related signals being multiplexed (e.g., data rates of the signals, various data type or status information, timing or other synchronization information, etc.). In one aspect, the TDM serial bit stream is transmitted and received via conventional packet-based network physical layer transceivers (e.g., Ethernet transceivers) that are particularly configured and controlled to transmit and receive essentially continuous bit streams rather than data packets. In another aspect, a 'digital audio snake' comprising multiple terminal units that each employs one or more packet-based transceivers is implemented by stringing together two or more such terminal units as a daisy chain connected by a communication medium.

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Maynard, MA, United States of America

Garth Dylan Wiebe