Telephone exchange system

Telephonic communications – Plural exchange network or interconnection – With interexchange network routing

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Details

379207, 379225, 379269, 379271, 379231, H04M 300

Patent

active

054043980

ABSTRACT:
A telephone exchange system useful for a bank or brokerage house speech system or the like, which can accommodate a large number of lines (or trunks) and permit improvement of the reliability and call connection processing capacity. The system comprises exchange sub-systems A (EX-A) and B (EX-B) capable of independently executing an exchange operation and each accommodating a terminal. The terminal, on the other hand, has a speech channel switch for connecting a speech channel including a handset to either exchange sub-system A (EX-A) or B (EX-B). When a process of connecting a call is brought about in the terminal, that terminal selects one of the exchange subsystems and controls the speech channel switch for connecting the call to the selected exchange sub-system.

REFERENCES:
patent: 4107477 (1978-08-01), Morrison
patent: 4136264 (1979-01-01), Yoshizaki
patent: 4442321 (1984-04-01), Stehman
patent: 4455455 (1984-06-01), Little
patent: 4488004 (1984-12-01), Bogart
patent: 4661974 (1987-04-01), Bales
patent: 4891834 (1990-01-01), Sezaki
patent: 5031211 (1991-07-01), Nagai
patent: 5185741 (1993-02-01), Iguchi
patent: 5249223 (1993-09-01), Vanacore
"PBXKAN: A Microprocessor-Based System for Modernization of Telephone Switching Stations", J. J. Matta et al. Symposium Record, SBT/IEEE International Telecommunications Symposium Rio De Janeiro, Brazil, Sep. 3-6, 1990.
"Switch-Based Virtual Private Line Service for the Financial Services Industry", S. L. Cocklin et al., Communications Connecting the Future, Globecom 1990 IEEE Global Telecommunications Conference & Exhibition, Dec. 2-5, 1990.
"Sopho 52500, The High-Range Communication Switch", M. B. Geelhoed et al., 61 Philips Telecommunication Review, vol. 43, No. 2, Jun. 1985.

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