Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1997-12-11
1999-06-01
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
34082505, 370222, 370223, 370224, 370258, G08B 2900, H04J 300
Patent
active
059091754
ABSTRACT:
A connection switching circuit is disposed in each node of a ring system in which a first ring and a second ring are provided with two communication lines which allow data to flow in a different direction respectively and is connected with a currently used passage and preliminary passage. The connection switching circuit comprises an alarm correction reading part for generating a control signal, an alarm monitor part for outputting respective alarm detection signals, a currently used/and preliminary alarm recognition part, and a switching control signal generation part for generating a control signal for selecting a passage, wherein either the currently used passage or the preliminary passage is selected by monitoring the alarm of the data which flows on the currently used passage or the preliminary passage to connect the first ring and the second ring with each other.
REFERENCES:
patent: 4716561 (1987-12-01), Angell et al.
patent: 5394389 (1995-02-01), Kremer
patent: 5406401 (1995-04-01), Kremer
patent: 5406549 (1995-04-01), Kremer
patent: 5440540 (1995-08-01), Kremer
patent: 5442620 (1995-08-01), Kremer
patent: 5491686 (1996-02-01), Sato
Takatsu Kazuo
Taniguchi Atsuki
Yamasaki Shosaku
Crosland Donnie L.
Fujitsu Limited
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