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

1986-09-02

1988-04-05

Brown, Thomas W.

Telephonic communications

Centralized switching system

Switching controlled in response to called station...

370 67, 370 85, 379166, H04M 300, H04Q 1104

Patent

active

047364092

ABSTRACT:
A private branch exchange includes a common control module and a plurality of line/trunk modules. A plurality 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 connected to the respective cards. For control data transmission, 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 control 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 controllers of line/trunk cards belonging to the same group.

REFERENCES:
patent: 4379950 (1983-04-01), Ahmed
patent: 4567589 (1986-01-01), Lecomte et al.
patent: 4627046 (1986-12-01), Bellamy
patent: 4653047 (1987-03-01), Vij et al.
patent: 4694452 (1987-09-01), Beckinger et al.

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