Aiphone AI-900 - Manual (Page 35)

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12.8.2. External sound source and AI-900AF connection
The External Sound Source Distribution function can be operated using the AI-900AF.
[Connection]
To connect external sound sources to the AI-900AF, use a twisted pair cable for voice input, and a twisted pair
cable for control input (level-operated activation). The voice input is 0 dB* and of unbalanced type. The start
input is a no-voltage make contact of 20 mA, 24 V DC max. Connect as shown below.
*0 dB = 1 V
External sound sources and AI-900AF connection
AI-900AF
CN1
CN2
CN3
4 twisted pair cables
To voice output (HOT)
To voice output (GND)
Mixer
Sound source
Sound source
Sound source
Sound source
Voice (HOT)
Voice (GND)
To control input (HOT)
To control input (GND)
To control output (HOT)
To control output (GND)
Timer
Voice input
Control input 1
Control input 2
Control input 3
Control input 4
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
Front view of
the cicuit board