Control data transmission system for private branch exchange

Details Control data transmission system for private branch exchange Control data transmission system for private branch exchange

H - Electricity

04

Q

344/29

H04Q 3/545 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 1268531

Abstract of the Disclosure A private branch exchange includes a common control module and a plurality of line/trunk modules. A plurali- ty of line/trunk cards are contained in a respective line/trunk module and terminals of the same type, such as digital telephones or standard telephones, are con- nected to the respective cards. For control data trans- mission, the line/trunk cards of each of the line/trunk modules are coupled to the common control module via a common control data highway. Each line/trunk card includes, for terminal control, a central processor unit (CPU) and random access memory (RAM) for storing a con- trol program in accordance with the type of terminals. To the line/trunk card is allocated an individual address and group address representing a group of line/trunk cards to which are connected terminals of the same type. With the use of the group address the common control module collectively down-loads control data and program corresponding to the type of terminals into port con- trollers of line/trunk cards belonging to the same group.

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