Telephonic communications – Plural exchange network or interconnection – With interexchange network routing
Patent
1993-09-01
1995-04-04
Dwyer, James L.
Telephonic communications
Plural exchange network or interconnection
With interexchange network routing
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.
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Domoto Yoshihisa
Wada Yasuo
Dwyer James L.
Hitachi Telecom Technologies Ltd.
Lau Michael N.
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