Transmission line-monitoring apparatus for use in a fire alarm s

Details Transmission line-monitoring apparatus for use in a fire alarm s Transmission line-monitoring apparatus for use in a fire alarm s

1995-08-08

1998-05-19

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

With particular system function

340506, 340522, 340531, 34082506, 34082507, G08B 2900

Patent

active

057541035

ABSTRACT:
A transmission line-monitoring apparatus which is able to detect the occurrence of a short circuit even when a line has a large resistance and also to speedily disconnect the short-circuited transmission line upon detection of a short circuit. When a short circuit occurs between branched transmission lines on the output side of the apparatus, a short-circuit detection circuit contained in the transmission-line monitoring apparatus detects this short circuit so as to send a short-circuit detection signal to a line-disconnecting control circuit. Then, the control circuit is operated so as to cause a constant current circuit to interrupt the supply of a base current to a transistor, thereby disconnecting a short-circuited output branched transmission line from a corresponding input branched transmission line.

REFERENCES:
patent: 4610012 (1986-09-01), Terada et al.

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