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Just think what it can do for your legacy system! The Modem 202 (MD845A-R2) and the Modem 202T (MD1970A, MD1970A-DC) function the same way. However, the Modem 202 supports speeds up to 1200 bps over unconditioned lines;...
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You can also run line and modem tests to verify the integrity of the line between the local and remote modems. With this test, the local Modem 202T loops back received data to the transmitter and sends the data to the remote modem.