12.7.2. External recording device and AI-900CO 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 o f 20 mA, 24 V DC max. Connect as shown below.
*0 dB = 1 V
External recording device and AI-900CO connection
To voice input (HOT) | 2 twisted pair cables |
| |
To voice input (GND) |
|
To recording start input (HOT) |
|
To recording start input (GND) |
|
Recording device
2 twisted pair cables
CN1
CN2 | Line 1 for |
| recording |
CN3 |
|
CN4 | Line 2 for |
| recording |
HOT Voice output
GND
HOT Control output
GND
HOT
GND Voice output
HOT Control output
GND
Recording device
Front view of the circuit board
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