Toa VS-900 - Manual (Page 45)

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12.11.4. Connecting the VS-900SC to another VS-900SC unit
Connect individual Voice Lines 1 – 4 connectors to each other.
Pins No. 1 and 2 of each connector of Voice Lines 1 – 4 are for receiving ends, while pins No. 3 and 4 are for
transmitting ends. Use 2 twisted pair cables to make connections as shown below.
2 twisted pair cables
VOICE LINE1
1 2 3
1 2 3 4
VS-900SC (figure of the inside of the front panel)
VOICE LINE1
1 2 3
1 2 3 4
VS-900SC (figure of the inside of the front panel)
12.11.5. Connection to an optical/audio signal converter
Connect the optical/audio signal converter to each connector of Voice Lines 1 – 4.
Pins No. 1 and 2 of each connector of Voice Lines 1 – 4 are for receiving ends, while pins No. 3 and 4 are for
transmitting ends. Use 2 twisted pair cables to make connections according to the specifications of the
equipment to be connected.