Cellular network data transmission system

Details Cellular network data transmission system Cellular network data transmission system

1990-02-28

1992-06-23

Dwyer, James L.

Telephonic communications

Emergency or alarm communications

Responsive to sensed nonsystem condition

379 39, 379 42, 379 59, H04M 1104

Patent

active

051250217

ABSTRACT:
A data transmission network uses a cellular network as a primary telecommunications link and a backup telecommunications link. The system continuously monitors the links and switches to the back up link if the cellular link is not operative. A software package is included in the computer at a monitoring station for effecting integrity checks of the links, and RF fault modules are also included.

REFERENCES:
patent: 4856047 (1989-08-01), Saunders
patent: 4868859 (1989-09-01), Sheffer
patent: 4887290 (1989-12-01), Dop et al.
patent: 4972455 (1990-11-01), Phillips et al.
patent: 4993059 (1991-02-01), Smith et al.
UK Patent Application GM 2194119, Security Services PLC, Ian S. Parry, Status Reporting Apparatus, 24 Feb. 1988.
Int'l Application Pub. No. WO 89/05553, BT Telecom, Inc. Sheffer, 15 Jun. 1989.

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