Data Sheet

The school communication Control Center shall be a
Bogen Model SI35A, or approved equivalent.
The Control Center shall be engineered for optimum
simplicity of operation, made possible by the use of
function-identified push buttons with associated
color-coded guidelines, and supported by step-by-
step instructions printed on the front panel.
Communication Control Centers, which are difficult
to operate and do not provide push-button operation,
color-coded guidelines, and operating instructions
permanently printed on the panels shall not be
considered. The Control Center shall provide at
least the following features and functions:
1. Direct two-way voice communication between
the Control Center and any classroom or speak-
er-equipped location, with simultaneous distribu-
tion of program material or voice announce-
ments to any other classroom or location.
2. Distribution of voice announcements from the
Control Center to any or all speakers.
3. Facilities for automatically sounding a superviso-
ry tone signal over any loudspeaker selected for
two-way communication, to alert the teacher to
the call, and to prevent unauthorized monitoring.
The tone signal shall sound whenever the class-
room is being monitored and shall repeat at reg-
ular intervals.
4. Distribution of program material to any or all
classrooms.
5. Ability to transmit a program or announcement
simultaneously to all classrooms by simple oper-
ation of a program source push button and the
All Rooms push button.
6. Separate inputs for two low-impedance bal-
anced microphones and one high-impedance
auxiliary program source (CD player/tuner, etc.).
Program source selection shall be accomplished
by simply pressing the appropriately labeled
push button.
7. Aural and visual monitoring of all program material.
8. Facilities for voice call origination to the Control
Center from any classroom equipped with a
voice call origination switch.
9. Facilities for annunciator call-in to the Control
Center from any classroom equipped with a call
origination switch. (Note: Specify Bogen CA10A
Call Switch for this feature.)
10. Facilities to positively prevent the Control Center
from monitoring any classroom whose call origi-
nation switch is in the Privacy position. (Note:
Specify Bogen CA11A Call/Privacy Switch for
this feature.)
11. Provision for the instantaneous distribution of
emergency messages from the Control Center
to all locations equipped with loudspeakers,
simply by pressing a single, red push button.
This action shall override all other programs and
bypass all other controls. The emergency
message shall be transmitted at a predeter-
mined level.
12. Provision for an optional emergency page feature
which shall permit emergency announcements
from a remote telephone or microphone to all
locations equipped with loudspeakers.
13. Classroom call origination with light annuncia-
tion and tone signal at the Control Center. Call
origination shall require only a momentary
depression of the call-origination switch, which
shall activate a repetitive tone signal and light
the annunciator lamp associated with the calling
classroom. The annunciator lamp shall remain
lit until the call is answered and then be auto-
matically cancelled.
14. Provision to optionally distribute a classroom
change signal to all speaker-equipped stations.
15. Functionally-identified push buttons and color-
coded guidelines for each function of the Control
Center. The intercom channel shall be identified
by green guidelines. The program channel shall
be identified by amber guidelines. The emer-
gency page push button shall be red.
16. Provision to include an optional CD player-
AM/FM tuner. (Note: Specify Bogen Model
CDR1.)
To fulfill the above requirements, a Bogen Model
SI35A, or approved equivalent Control Center shall
be used, meeting the following technical require-
ments:
It shall be designed for continuous duty service in
institutional and industrial applications on line volt-
ages of 120 volts, 60 Hz AC, over a temperature
range of 0°F to 130°F. Power consumption of the
MCP35A control panel, at rated output, shall not
exceed 100 watts.
It shall include two separate amplifiers. The program
amplifier shall be capable of producing 35 watts
RMS at less than 1% distortion at rated power and
bandwidth. The frequency response shall be within
+1, -3 dB from 80 Hz to 15 kHz. The intercom ampli-
fier shall have an output rating of 20 watts RMS;
frequency response shall be shaped for maximum
intelligibility. Both amplifiers shall have a balanced
25-volt line output.
Architect and
Engineer
Specifications