Toa VS-900 - Manual (Page 32)

32
12.5.2. External recording device and VS-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 audio output, and a twisted pair cable
for control output. The audio 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 VS-900AL connection
2 twisted pair cables
2 twisted pair cables
To audio input (HOT)
To audio input (GND)
To recording start input (HOT)
To recording start input (GND)
Recording device
Recording device
VS-900AL
CN1
CN2
CN3
CN4
HOT
GND
HOT
GND
HOT
GND
HOT
GND
Line 1 for
recording
Line 2 for
recording
Audio output
Control output
Audio output
Control output
Front view of
the circuit board