telephone system instruments interconnected to the PA system via an
interface module to allow telephone dial up access to the paging amplifier.
Interface module shall produce an alert tone in the associated speakers on
activation. Telephone interface module shall as a minimum conform to the
following specifications:
600 ohms
100Hz to 10Khz
70V Input Impedance:
200K ohms
Output level:
400mV rms
Input Power Requirement:
12-24Vdc (from power supply)
Access requirement:
Electronic (analog) or IA2 line key (line card
required) PABX loop or ground-start trunk
port, or dedicated single-line phone.
PART 3
EXECUTION
3.1
INSTALLATION
Equipment shall be installed as indicated and specified, and in accordance
with the manufacturer's recommendations except where otherwise indicated.
Equipment mounted out-of-doors or subject to inclement conditions shall be
weatherproofed. The antenna shall be supported at least 1.5 m 60 inch
clear above the roof by means of self-supported or guyed mast.
3.1.1
Equipment Racks
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NOTE: Racks be located adjacent to walls. If a
mechanical rack/floor attachment is required,
controls shall not be lower than 762.0 mm (30
inches) nor higher than 1.7 m (66 inches) above
floor; CD, Cassette player and Tuner shall not be
lower than 1220 mm (48 inches) nor higher than 1524
mm (60 inches) above floor.
**************************************************************************
Racks shall be mounted side-by-side and bolted together. Items of the same
function shall be grouped together, either vertically or side-by-side.
Controls shall be symmetrically arranged at a height as shown. [CD,
Cassette & Tuner shall be at a height above the floor as shown.] Audio
input and interconnections shall be made with approved shielded cable and
plug connectors; output connections may be screw terminal type. All
connections to power supplies shall utilize standard male plug and female
receptacle connectors with the female receptacle being the source side of
the connection. Inputs, outputs, interconnections, test points, and relays
shall be accessible at the rear of the equipment rack for maintenance and
testing. Each item shall be removable from the rack without disturbing
other items or connections. Empty space in equipment racks shall be
covered by blank panels so that the entire front of the rack is occupied by
panels.
3.1.2
Wiring
Wiring shall be installed in rigid steel conduit, intermediate metal
conduit, cable trays, or electric metallic tubing as specified in Section
16402 INTERIOR DISTRIBUTION SYSTEM. Wiring for microphone, grounding, line
level, speaker and power cables shall be isolated from each other by
physical isolation and metallic shielding. Shielding shall be terminated
SECTION 16770
Page 17
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