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US 2021/0280046 A1Published application
Fire alarm system and booster
AssigneeHochki Corporation
InventorsYoshihiro MATSUDA, Shigeru KANEKO, Takehiro ONO, Akira ISHIDA
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AssigneeHochki Corporation
InventorsYoshihiro MATSUDA, Shigeru KANEKO, Takehiro ONO, Akira ISHIDA
Estimating the term…
A fire detector is connected to a loop transmission line connected to a receiver. When the loop transmission line is normal, a transmission unit is connected to the fire detector. When a disconnection failure occurs, a disconnection monitoring unit turns on switching circuits to connect the end of the loop transmission line to the transmission unit, and the receiver connects to the fire detector from both ends of the loop transmission line. An input/output switching booster is inserted and connected in the middle of the loop transmission line, and when the start side transmission line is disconnected and the switching circuits are turned on, the input/output is switched. Accordingly, the input/output switching booster amplifies the down signal input from the terminal side transmission line and outputs it to the start side transmission line and at the same time amplifies the up signal input from the start side transmission line.
A fire alarm system, wherein a fire detector having a unique address is connected to a loop transmission line that is looped to the receiver or repeater which is connected to the receiver, upon a loop transmission line is normal, a transmission unit of the receiver connected to the start end of the loop transmission line communicates with the fire detector to monitor the fire, and upon a disconnection occurs in the loop transmission line, an end of the loop transmission line is connected to the transmission unit to connect to the fire detector from both ends of the loop transmission line, and communication is performed to monitor a fire, the improvement comprising:
A booster, wherein the booster is inserted in the middle of a loop transmission line connected to a receiver in a loop, a down signal input from a start side transmission line being amplified and output to a terminal side transmission line, and an up signal input from a terminal side transmission line being amplified and output to the start side transmission line,
Dependencies are inferred from the claim text.