Telephonic communications – Centralized switching system – With generating of call associated substation signal
Patent
1994-02-16
1994-11-01
Dwyer, James L.
Telephonic communications
Centralized switching system
With generating of call associated substation signal
379 96, 379100, 3701101, H04M 364
Patent
active
053612990
ABSTRACT:
An exchange apparatus which encloses a plurality of extension terminals and connects the extension terminal designated by a signal from a line wire to the line wire, includes: a memory to store an attribute of the extension terminal; a comparator to compare an attribute designated by the signal from the line wire such as a transmission side terminal with the attribute of the extension terminal stored in the memory; and a changing circuit for changing the attribute of the extension terminal stored in the memory so as to coincide with the attribute designated by the signal from the line wire in the case where the result of the comparison by the comparator indicates that the attributes differ. Even if an attribute such as a data transmission rate or the like of the transmission side terminal differs from an attribute of the data terminal connected to the extension, communication can be started without disconnecting a call and the operating efficiency can be raised.
REFERENCES:
patent: 4680781 (1987-07-01), Amundson et al.
patent: 4894847 (1990-01-01), Tjahjadi et al.
patent: 4958153 (1990-09-01), Murata et al.
patent: 4961185 (1990-10-01), Sawada
patent: 5001709 (1991-03-01), Satoh
patent: 5093857 (1992-03-01), Yoshida et al.
Control Cable Inc Catalog (1988), Modems on pp. 82 and 83.
Telecommunications Magazine, vol. 23, No. 3, p. 46 "V.32" (Mar. 1989).
Canon Kabushiki Kaisha
Dwyer James L.
Matar Ahmad F.
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