Local Analog Loopback L3 - &T1
Use the analog loopback test if you suspect the modem is causing errors
in data transmission. The local analog loopback test verifies both the modem
and the local computer. If the test fails, the local computer may be at
fault.
Note: This test may be performed with a V.21, V.22, V.22bis, or V.23
connection.
Step 1:
Set the local computer to echo characters and the local modem to echo
commands received from the local computer (the E1 option selected). Initiate
the test with &T1. Type a few sentences; they will be looped back to
the local computer.
Step 2:
If the modem echoes your keyboard input to the screen as you typed it,
the modem is operating correctly. If not, the modem may be faulty. To end
the test, enter the command state by issuing the escape sequence with guard
time (+++) and then issue the &T0 command.
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