Digital private branch exchange

Details Digital private branch exchange Digital private branch exchange

H - Electricity

04

Q

344/29

H04Q 3/54 (2006.01) G06F 15/16 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 1158347

ABSTRACT OF THE DISCLOSURE A digital private automatic branch exchange provides a plurality of ports which may comprise line trunks or operator circuits, the ports being grouped with each group being controlled by an individual microprocessor circuit which performs all real time control over the ports. Voice communication between ports is effected by time division multiplex in connection with a digital switch system forming part of a common control which is controlled by a central processing unit responsive to the microprocessors in each port group for assigning time slots to each interconnection channel. Isolation between the central processing unit and the rest of the system is provided by a peripheral bus to which the common control units and port groups are connected, which peripheral bus is connected to the CPU bus by way of an interface circuit, permitting the system to operate with various types of central processing units without redesign of the peripheral units.

316948

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