Backup apparatus against line defect and backup method against l

Details Backup apparatus against line defect and backup method against l Backup apparatus against line defect and backup method against l

1994-10-28

1996-05-07

Matar, Ahmad F.

Telephonic communications

Centralized switching system

Switching controlled in response to called station...

379 26, 379 98, 370 16, 34082516, H04M 308

Patent

active

055154298

ABSTRACT:
A backup apparatus in a communication system, functioning such that when an analog dedicated line is working properly, controllers on a host unit side and a terminal unit side control respective switching circuits so as to connect a modem on the host unit side with the analog dedicated line and a modem on the terminal unit side with the analog dedicated line. Thus, data is transmitted and received between the host unit and the terminal unit over the analog dedicated line. When the defect detecting portion of the modem detects occurrence of a line defect, the controller of each backup unit controls the switching circuit and the ISDN interface portion so as to connect the host unit and the terminal unit over the ISDN network. Thereafter, until the analog dedicated line restores from the defect, data communication is made between the host unit and the terminal unit over the ISDN network.

REFERENCES:
patent: 4119815 (1978-10-01), Frankfort et al.
patent: 4998274 (1991-03-01), Ephraim
patent: 5151896 (1992-09-01), Bowman et al.
patent: 5210740 (1993-05-01), Anzai et al.
J. F. Day, et al., "Networking Voice and Data With A Digital PBX", AT&T Technology, vol. 2, No. 3, pp. 22-29, 1987, Short Hills, NJ.
L. H. Eberl, et al., "Integrated ISDN D-Server For Intelligent Newtorking", Globecom '89, Session 15, Paper 4, vol. 1, pp. 1-4, 27 Nov. 1987, Dallas, TX.

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