Local Analog Loopback with Self Test - &T8
This test is used to verify the integrity of the local modem transmit and
receive circuits. During this test, an internally generated test pattern
is transmitted from the modem, looped back into the receiver circuit, and
compared with the original pattern for any errors.
Note: This test may be performed with a V.22 or V.22bis connection
(&Q0 and B0 selected).
Step 1:
Set the computer to echo characters and the local modem to echo commands
received from the computer (the E1 command selected). start the test by
issuing the &T8 command.
Step 2:
When the test is terminated, with the &T0 command, the modem returns
a three-digit test result (e.g., 000=no errors, 012=12 errors). If the error
count reported is 000, the local modem passed the test. An error count of
255 indicates that 255 or more errors were detected.
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