(maximum quantity of remote stations approximately
30) and generally when only a small number of master
stations (usually 1 or 2) are required. However, if
there is a requirement for annunciation at more than
one location or a requirement for multiple
conversation paths, the use of this system with more
than 1 or 2 master stations, or with many more than
30 remote stations may be justified or required.
Type 2, Single Conversation Path, Central Control
System. This type of system is applicable to
relatively large systems (more than approximately 30
stations) where only one conversation path is
required and usually only one master station. This
type of system is applicable to BEQ's. This type of
system includes public address and paging systems
when the unique requirements are included.
Type 3, Multiple Conversation Paths, Central Control
System. This type of system is applicable to
various size systems where a large portion of the
total quantity of stations are master stations. A
limited quantity of conversation paths may be
specified as required.
**************************************************************************
The Intercommunication System shall be solid state, modular in design, and
shall be of the [wired] [and] [wireless] type as indicated. [Stations
shall have capacity for later expansion to [[_____] master] [and] [[_____]
remote] stations [with [_____] handset] [and] [or] [with hands free
operation] without sacrificing any equipment or feature of performance.]
[When both wired and wireless circuitry are used, such interface shall not
present a reduction of function or quality.]
1.3.1
Sound Reproduction
The intercommunication system shall reproduce a signal at all receiving
stations from a 40 dB minimum input signal referenced to a microphone sound
pressure level (SPL) over the frequency range of [300] [_____] to [3300]
[_____] Hz. The received signal shall have a dynamic range of 30 dB,
adjustable at the receiving station. Unless otherwise specified SPL shall
be 20 micro Paschal. The root-mean-square (rms) extraneous noise (e.g.
hum) level introduced by the intercommunication system shall be at least
[30] [_____] dB below the nominal signal level. Distortion, including
envelope delay, intermodulation, cross talk, and other nonlinear sources,
shall not exceed 5 percent.
1.3.2
System Operation and Service Features
1.3.2.1
Control and Power Requirements
The system shall have a power switch and an associated pilot light for ON
and OFF operations. A volume control at each station shall be used to
regulate listening volume. System shall operate on 110-125 Vac, single
phase, 60 Hz.
1.3.2.2
Call-In Indication
Master stations shall have a "call-in" switch to provide an audible and/or
SECTION 16721
Page 7
Previous Page
