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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

To voice input (HOT)

To voice input (GND)

To recording start input (HOT)

To recording start input (GND)

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

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Aiphone AI-900 Specifiche Pagina 29