Installation
Rack-mounting
The CSP-428 and CSP-1248 fit standard 48-centimeter (19-inch) rack equipment, occupying one rack unit
(1 RU) in height and requiring a mounting depth of 208 millimeters (8.2 inches) from the front rack rail. Use
four fasteners with washers (not included) to mount the CSP.
The CSP-428 and CSP-1248 use active side ventilation and can safely operate in ambient conditions from 0°C
to 40 °C (32°F to 104 °F).
See Technical Specifications (page 20) for power dissipation ratings for each model.
Analog Audio Connections
The CSP-428 and CSP-1248 include two types of analog inputs for audio devices: summed mono RCA
connectors and balanced Euroblock connectors. The analog outputs are balanced Euroblock connectors.
The termination end of each Euroblock connector includes printed terminal block descriptions. The following
diagrams show the recommended balanced/unbalanced wiring between the audio connectors on the
processor and common audio connectors to external audio components.
To integrate the processor into a telephone switching system, use the PBX (private branch exchange) terminal.
AVM-1
To use the built-in AutoVolume feature, use one or more Bose AVM-1 sense
microphones with the CSP. Insert the −, +, and ground wires connected to the AVM-1
to the corresponding terminals of a Euroblock included with the Bose CSP. Connect
that Euroblock to an analog input on the rear panel of the Bose CSP.
See the AVM-1 installation guide for more information.
Note: The AutoVolume feature is optimized for use with Bose AVM-1 sense
microphones only.
Source Device Connector Euroblock Input Connector
RCA
Phone Plug
(Balanced)
XLR
Phone Plug
(Unbalanced)
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