2.5
DIGITAL ALARM COMMUNICATOR TRANSMITTER (DACT)
The DACT shall be compatible with the DACR, and shall comply with all
requirements of NFPA 72. Each DACT shall be the manufacturer's current
commercial product completely assembled, wired, tested at the factory, and
delivered ready for installation and operation.
2.5.1
Functional Requirements
2.5.1.1
Interfacing Indicators and Controls
The DACT shall incorporate the provisions for auxiliary interconnection to
existing building fire alarm systems. Connections shall be via screw
terminals.
2.5.1.2
Signal Transmission
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NOTE: Determine the availability and applicability
of public switched telephone network lines or local
PBX service for use in each project. Local PBX must
be loop-start configuration to allow the DACT to
operate properly. Telephone lines connected to the
DACR must be configured for sequential hunting.
Show the telephone lines to be used, on the Drawings.
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The DACT shall initiate transmission using a loop-start format. The DACT
shall connect to 2 telephone lines, shown on the Contract Drawings. To
initiate a transmission, the DACT shall seize the primary telephone line,
disconnecting any telephones, obtain a dial tone and dial the DACR. The
DACT shall make a minimum of five attempts to connect to the DACR. If a
connection is not made, the DACT shall attempt to connect to the DACR via
the second telephone line. A failure of one telephone line shall report a
trouble condition at the building fire alarm panel and at the monitoring
center via the secondary telephone line. When the DACT makes a connection
to the DACR, the required alarm or test information shall be transmitted.
Confirmation of the signal shall be accomplished by repetition of the
signal, parity checks or equivalent checksum-type transmission. Each DACT
shall transmit a test signal a minimum of once every 24 hours. The DACT
shall provide a minimum of 4 alarm input connections from the building fire
alarm control panel.
2.5.2
Enclosure
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NOTE: Show on the Contract Drawings specific
locations where a NEMA 4 (weatherproof) enclosure is
to be used in lieu of NEMA 1.
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A locking enclosure shall be provided for each DACT. The enclosure shall
be of the NEMA type indicated on the Contract Drawings, or NEMA 1 where not
indicated. The enclosure shall provide sufficient space for mounting the
DACT, interfaces, power supply and backup batteries, wiring and terminal
strips, including adequate space for maintenance access.
SECTION 13853A
Page 13
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