[an annunciator panel] and all amplifiers. Master station shall
selectively communicate with any remote station by actuating the [two]
[three] digit number assigned to that remote station. [Master station
shall be designed to communicate with all remote stations simultaneously or
in groups of not less than 10 stations by actuating an assigned "all-call"
number.] Only the selected remote station shall be able to listen or talk
to the master station. A nonselected remote station shall not be able to
hear or interfere with any portion of conversation between master station
and selected remote station. Hanging up master station handset shall reset
system for next call. Quantity and location of remote stations shall be as
indicated.
2.1.2.1
Master Station
Provide [desk-top] [rack]-mounted type master station equipped with a
handset with a switch for private conversations [with permanently coiled
cord, approximately 1525 mm 5 feet long extended]. Master station shall
have molded shock-resistant plastic handset and housing. Housing shall be
mounted on a steel base plate with a station selector with ten-digit,
silent operating touch key mechanism.
2.1.2.2
Remote Station
Provide [desk-top] [surface wall] [recessed wall] [rack]-mounted remote
stations with [stainless steel] [anodized aluminum] face plates with
temperproof mounting screws and [galvanized steel] [aluminum] backbox. [A
"call-in" switch mounted on a faceplate to provide selective call-in to
master station shall be provided as an integral part of the remote
station.] Remote stations shall provide a speaker with a minimum
sensitivity of 40 dB for speakers less than 200 mm 8 inches in diameter and
at least 45 dB for speakers 200 mm 8 inches or greater. Remote stations
shall have a call announcement monitor lamp [and recurring momentary tone].
2.1.2.3
Intercommunication Amplifier
Intercommunication amplifier shall as a minimum conform to the following
specifications:
a.
Output power:
[2] [_____] watts rms or greater
b.
Total harmonic distortion: Less than 5 percent at rated output
power with a load equivalent to one station connected to output
terminals
c.
Signal-to-noise ratio:
60 dB or greater at rated output
d.
Frequency response ratio:
Plus or minus 2 dB from 200 Hz to
10,000 Hz
2.1.2.4
All-Call Amplifier
All-call amplifier shall as a minimum conform to the following
specifications:
a.
Output power:
Minimum of [0.5] [_____] watt rms for each station
b.
Total harmonic distortion: Less than 5 percent at rated output
power with a load equivalent to the quantity of stations connected
to it in all-call mode of operation
SECTION 16822N
Page 10
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