Aiphone AI-900 - Manual (Page 34)

34
12.8. AI-900AF Audio Function Card Connection
12.8.1. Amplifier and AI-900AF connection
Paging can be provided through connected external amplifiers using the AI-900AF.
[Connection]
To connect the amplifier to the AI-900AF, use a twisted pair cable for voice output, and a twisted pair cable for
control output. The voice output is 0 dB* and of unbalanced type. The control output is an open collector
output of 20 mA, 24 V DC max., and permits connection of up to 16 channels. Connect as shown below.
*0 dB = 1 V
External amplifier and AI-900AF connection
To voice input (HOT)
To voice input (GND)
1 twisted pair cable
1 twisted pair cable
To start input (HOT)
To start input (GND)
AI-900AF
CN4
CN5
CN7
CN8
CN6
Voice output
Control output 1
Control output 2
Control output 3
Control output 4
Control output 9
Control output 10
Control output 11
Control output 12
Control output 5
Control output 6
Control output 7
Control output 8
Control output 13
Control output 14
Control output 15
Control output 16
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
HOT
GND
Amplifier(1)
Amplifier(2)
Amplifier(15)
Amplifier(16)
Front view of
the circuit board