Local Digital Loopback - &T3
Local digital loopback tests the communication link and the remote modem.
During this test, the local modem loops incoming data directly back to the
remote modem.
Step 1:
Establish a connection with a remote modem, then enter the command state
and issue the &T3 command.
Step 2:
The operator at the remote system should type in a few sentences. They are
looped back to the remote computer. When the remote operator at the indicates
that the test is complete, issue the &T0 command to end the test. If the
remote operator reports that the data came back without errors, the remote
modem and the communication link are functioning properly.
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