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Abstract

A communications controller coupled to a synchronous network generates local clock reference signals from network clock signals. The network clock signals are used to transport data over the network at a constant rate. The controller receiving a bit stream while generating the local clock reference signals. The bit stream including program clock reference signals, the program clock reference signals being independent of the network clock signals. The program clock reference signals are extracted from the bit stream and compared, after normalization, with the local clock reference signals. If the program clock reference signals are, time-wise, in advance of the local clock reference signals, transport of the bit stream is suspended, otherwise the bit steam is transported over the network. While transport of the bit stream is suspended, data from an alternative bit stream can be transported.

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First Claim