5-2 Low Power Alarm system
297–1001–122 Standard 06.01 August 1999
Visual display units (VDU) provide strategically located lights for alarm
indication. These VDU also provide manual controls for alarm transfer,
(audible) alarm silencing, and the capability to test alarm indicator lights.
Low Power Alarm system
The following sections contain a description of the LPA system functions
and components.
Low Power Alarm System features
The LPA system provides the following:
• low voltage power supplies to replace the high voltage power supplies in
previous alarm system versions
• all audible panels (of earlier alarm system versions) combined into one
unit
• all visual display and control panels (of earlier alarm system versions)
combined into one unit
• low power audible electronic devices (on-board circuits) to generate
tones
• smaller and lighter alarm panels
• inactive timing circuit (IATC) provided on the NT3X82 card
• office voice loop
• office data loop
• conversion kits to convert earlier alarm system versions to an LPA
system
Inactive timing circuit clock
The IATC clock is a mechanical device that displays the length of a dead
system condition in hours, minutes, and seconds. A rechargeable lithium
battery powers the IATC clock.
Office data loop
The LPA system provides the capability to connect a MAP terminal
anywhere on office equipment frames or cabinets through the following:
• port jacks in the frame supervisory panels (FSP) or modular supervisory
panels (MSP)
• main distribution frame (MDF)
You can access provisioned input/output controller (IOC) ports through
manual switches on the ACD panels.
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