Title:
FIRE ALARM SYSTEM AND BOOSTER
Document Type and Number:
WIPO Patent Application WO/2020/152730
Kind Code:
A1
Abstract:
[Problem] To enable fire monitoring that uses all fire detectors, even if a wire break fault occurs in a loop transmission path along which a booster is provided. [Solution] A fire detector 18 is connected to a loop transmission path 12 connected to a receiver 10. When the loop transmission path 12 is normal, a communication connection is established from a transmission unit 22 to the fire detector 18 to monitor for fires. When a wire break fault occurs in the loop transmission path 12, a wire break monitoring control unit 28 turns ON switch circuits 30a, 30b, connects a terminal end of the loop transmission path 12 to the transmission unit 22, and establishes a communication connection from both ends of the loop transmission path 12 to the fire detector 18 to thereby monitor for fires. A switchable input-output booster 16 is inserted and connected along the loop transmission path 12. When a wire break occurs in a starting-end transmission path 12a and the switch circuits 30a, 30b are turned ON, input and output are switched so that a downlink signal input from a terminal-end transmission path 12b is amplified and output to the starting-end transmission path 12a, and an uplink signal input from the starting-end transmission path 12a is amplified and output to the terminal-end transmission path 12b.
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Inventors:
MATSUDA YOSHIHIRO (JP)
KANEKO SHIGERU (JP)
ONO TAKEHIRO (JP)
ISHIDA AKIRA (JP)
KANEKO SHIGERU (JP)
ONO TAKEHIRO (JP)
ISHIDA AKIRA (JP)
Application Number:
PCT/JP2019/001572
Publication Date:
July 30, 2020
Filing Date:
January 21, 2019
Export Citation:
Assignee:
HOCHIKI CO (JP)
MATSUDA YOSHIHIRO (JP)
KANEKO SHIGERU (JP)
ONO TAKEHIRO (JP)
ISHIDA AKIRA (JP)
MATSUDA YOSHIHIRO (JP)
KANEKO SHIGERU (JP)
ONO TAKEHIRO (JP)
ISHIDA AKIRA (JP)
International Classes:
G08B17/00
Foreign References:
| JPH06259688A | 1994-09-16 | |||
| JPH0844984A | 1996-02-16 | |||
| JPH08336192A | 1996-12-17 | |||
| JP2008004033A | 2008-01-10 | |||
| JP2010114632A | 2010-05-20 |
Other References:
See also references of EP 3916690A4
Attorney, Agent or Firm:
TAKEUCHI, Susumu (JP)
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