type gold plated contacts rated for five million operations.
2. Volume Control to regulate incoming call volume.
3. A light annunciation that identifies the calling stations and stations
in use. The light shall remain on until the call is answered.
4. A tone annunciator with a momentary audible tone signal that announces
incoming calls.
5. [A handset with hook switch, telephone type, arranged to disconnect the
speaker when the handset is lifted. The cord shall be 450 mm 18 inches
long and permanently coiled.]
6. A metallic central control cabinet that shall comply with EIA-310-D.
The cabinet shall houses terminal strips, power supplies,amplifiers, system
volume control, and auxiliary equipment. It shall be lockable and
ventilated.
7. The master station shall accommodate [_____] stations and shall have a
speaker sensitivity of 40 dB minimum.
2.2.2
Intercommunication Amplifier
The system intercommunication amplifier shall as a minimum conform to the
following specifications:
Output Power:
2 watts rms minimum with adequate power for all
functions and a 20% spare capacity
Total Harmonic
Distortion:
Less than 5 percent at rated output
power with a load equivalent to one
station connected to output terminals
Signal-To-Noise
Ratio:
60 dB or greater at rated output
Plus or minus 2 dB from 200 Hz to
10,000 Hz
Output Regulation:
Maintains output level within 2dB from full to
no load
Input Sensitivity:
Matched to input circuit and providing
full-rated output with sound-pressure level
of not more than 10 dynes/sq. cm 0.000145 psi
impinging on master stations, speaker
microphones, or handset transmitters.
2.2.3
Remote Station
[Desk] [Surface wall] [Recessed wall] [Rack]-mounted remote station shall
have [stainless steel] [anodized aluminum] faceplate with tamper proof
mounting screws and [galvanized steel] [aluminum] backbox . The remote
station shall have:
A speaker with a minimum sensitivity of 40 dB for speakers less than 200
SECTION 16721
Page 10
Previous Page
