G - Physics – 08 – B
Patent
G - Physics
08
B
340/71, 379/8, 3
G08B 29/00 (2006.01) G08B 26/00 (2006.01) H04M 11/00 (2006.01) H04M 11/04 (2006.01)
Patent
CA 1102460
CENTRAL STATION SYSTEM INCLUDING ALTERNATIVE SIGNAL PATH THROUGH COMMERCIAL TELEPHONE NETWORK Abstract of the Disclosure A central station system in which the central station is normally connected to one or more remotely located bridging points by a dedicated communication path, each bridging point having a plurality of output ports to which one or more remote station devices are connected. In response to address signals generated by the central station, a bridging point connects an identified output port to the dedicated communication path to allow communica- tion between the associated remote stations and the central station. All other output ports are electrically isolated from the dedicated communication path. In the event of failure of the dedicated communication path, apparatus is provided for establishing an alternate communication path through the commercial telephone network. The system is highly immune to tampering and other forms of failure because of automatic decision-making capabilities of the bridging point and other features of the apparatus.
303859
Frankfort Eric J.
Terrett David S.
American District Telegraph Company
Gowling Lafleur Henderson Llp
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