Digital data transmission system

Details Digital data transmission system Digital data transmission system

H - Electricity

04

J

363/17

H04J 3/06 (2006.01)

Patent

CA 2019649

A digital data transmission system comprises at least two data sub-systems connected to respective data termination units interconnected via a time-division multiplexed communications network having an internal system clock. The DTUs are part of the communications network and have their internal timing slaved to the network. The data sub-systems have independent timing from the communications network and therefore data sub-systems clocks will be liable to drift relative to the DTU clocks. The incomin data stream is applied to a FIFO memory, whose state is used to identify overate or underate conditions in the the transmitting sub-system. Clock adjustment data is transmitted with communications data in a superframe consisting of n frames of m bits each (where n, m are integers), and the received data steam is adjusted in accordance with said clock adjustment data to compensate the received bit stream for overate or underrate conditions.

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