Time division digital switching system

Details Time division digital switching system Time division digital switching system

H - Electricity

04

Q

344/25

H04Q 11/04 (2006.01)

Patent

CA 1110745

ABSTRACT The invention disclosed pertains to time division switching systems used in digital telephone switching and in data communication. In prior, systems, the maximum number of simultaneous connections between pairs of subscribers is half the number of time slots in a communication path. The present invention permits the degree of multiplexing to be equal to the time slots in a communication path. It involves the use of a code coveting cir- cuit for receiving two digital signals from two line circuits participating in one communication and for producing a third digital signal indicating the relationship between the two digital signals. A common bus distributes the third signal to the respective line circuits. A control memory stores many address pairs for the two line circuits. Control circuitry allots one time slot to the two line circuits so that information is changed periodically between the two line circuits by an address pair obtained periodically from the memory. A code inverse-converting circuit in each line receives the third digital signal and the digital signal from its own line to reproduce the digital signal of the other line.

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