Aiphone AI-900 - Manual (Page 29)

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12.5.2. External recording device and AI-900AL connection
An external recording device can be connected to each telephone line.
[Connection]
To connect the external recording device, 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. Connect as shown below.
*0 dB = 1 V
External recording device and AI-900AL connection
2 twisted pair cables
2 twisted pair cables
To voice input (HOT)
To voice input (GND)
To recording start input (HOT)
To recording start input (GND)
Recording device
Recording device
AI-900AL
CN1
CN2
CN3
CN4
HOT
GND
HOT
GND
HOT
GND
HOT
GND
Line 1 for
recording
Line 2 for
recording
Voice output
Control output
Voice output
Control output
Front view of
the circuit board