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Figure 5 shows how the TC1903 connects to the phone or PBX as in Figure 3 and 4. TC1903's RJ-11 Jack
use the middle two pins to connect to telephone or PBX's Tip and Ring.
For analog audio signals:
Pin 5 is the transmit TIP & pin2 is the transmit RING.
Pin 4 is the receive TIP & pin 3 is the receive RING.
Note: When using the Analog interface, both TC1903 units must be configured as FXO units. Typically, this
configuration will be done by the factory depending on the customer's application. The front panel DIP switches
#2 will be set to the down "On" position.
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MNL-19030-01-19
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