(c)REMOTE DIGITAL LOOPBACK – 4/Wire Network (Figure 5) Configure both the local and remote modems as follows:
Switch 1 = ON (TxA = 0dBm) Switch 3 = ON (RxA =
Switch 8 = ON (Line Termination = 600 ohms) Switch 9 = ON (Soft Carrier Turn Off = ON)
Connect TxD to RxD at the remote modem.
Transmit a test message from the local modem and confirm that the same message is received back at RxD on the local modem with no data errors.