H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/15, 344/4
H04J 3/16 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 1036726
Abstract of the Disclosure A carrier telephone system useful in serving a large number of subscribers by delta modulation over a digital transmission facility having a predetermined bit rate capacity. The system comprises a central office control terminal, one or more remote terminals and an interconnecting digital transmission facility. The subscribers are connected to the remote terminals by wire pairs. The control terminal interfaces with the central office switching machine and provides a line appearance for each subscriber connected to the remote terminal and controls the assignment of transmission channels to active subscribers. The system includes a full access non-blocking concentration switching subsystem. The system provides for a normal mode of operation where a fixed number of transmission channels are available for assignment to active subscribers. In this mode the transmission channels operate at a fixed bit rate. When all transmission channels have been Assigned to sub- scribers, the system operates in an elastic mode which adds or deletes additional transmission channels as required by the subscriber traffic. As transmission channels are added or deleted while in the elastic mode, the bit rate for all transmission channels changes accord- ingly. The carrier concentrator system and method is also useful in providing interoffice telephone trunks between a hub central office and one or more tributary offices.
212092
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