Closed user group facility

Details Closed user group facility Closed user group facility

1976-11-17

1978-06-06

Robinson, Thomas A.

Telegraphy

Systems

178 2B, 178 41R, H04L 1100

Patent

active

040938190

ABSTRACT:
A closed user group facility in a data transmission system which has a closed user group of terminals accomodated in a switching network, and in which the switching network registers a terminating terminal in response to a request for registration of that designated terminating terminal from another one of the terminals. The registration of the corresponding terminating terminal is with one of codes with which all the terminals accommodated in the switching network can be individually identified. Subsequently when transmitting data (including voice data) from the originating terminal to the terminating one, the switching network controls to permit the transmission of the data from the originating terminal to the terminating one when the switching network has verified that the originating and terminating terminals had already been mutually registered as distant terminals.

REFERENCES:
patent: 3206728 (1965-09-01), Baumgart et al.
patent: 3993980 (1976-11-01), Moreton

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