Audio system end of line load module providing a load on the...

Details Audio system end of line load module providing a load on the... Audio system end of line load module providing a load on the...

2006-12-14

2009-10-13

Hofsass, Jeffery (Department: 2612)

Communications: electrical

Condition responsive indicating system

With particular system function

C340S635000, C381S082000

Reexamination Certificate

active

07602282

ABSTRACT:
An end-of-line module provided at the end of the line of an audio circuit provides a load in response to a test signal. The load is detectable by an announcement control system so that a fault indication may be triggered in the event the announcement control system does not sense the end-of-line module as being connected to the audio circuit and detects an interruption in the audio circuit. In addition, the end-of-line module may include an over-temperature sensor or protection device to prevent the audio circuit from exceeding a predetermined limit, for example, a temperature level assigned to insure compliance with fire, safety and other standards or specifications. A fault or other indication may be reported to or sensed by the announcement control system and may be further processed in a manner appropriate for the application and/or facility having the announcement control system.

REFERENCES:
patent: 6462653 (2002-10-01), Scorfield et al.
patent: 2006/0182288 (2006-08-01), Arcaria et al.
patent: 2007/0085694 (2007-04-01), Larkin
NFPA 72, National Fire Alarm Code, 2007 Edition, effective Aug. 17, 2006—p. 1 and other selected portions of document attached—4 pages.
UL 864, Control Units and Accessories for Fire Alarm Systems, ISBN 0-7629-0795-9, Jul. 14, 2005, p. 1 and section 19.1 attached—2 pages.

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