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ARC - alarm receiving centre
AS - alarm system
ACE – ancillary control equipment
AE – annunciation equipment
ATP – alarm transmission path
ATS - alarm transmission system
CIE - control and indicating equipment
HAS - hold-up alarm system(s)
IAS - intruder alarm system(s)
I&HAS – intrusion and hold-up alarm system(s)
WD – warning device
PS- power supply
RCT – receiving center transceiver
SPT - supervised premises transceiver
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