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MIU Installation, Operation & Diagnostics Edition: January 25, 1999 Page 23
&T8 LOCAL LOOPBACK WITH SELF TEST (See Figure 6)
The modem should be on hook. Enter AT&T8 to configure the modem
for analog loopback and self test. The test timer is started at the time
indicated by S18, DSR is turned off (if &S1 is in effect). A self test
condition is entered, and an OK result code is sent to the DTE. During the
test the modem sends a test message and counts errors in the looped
back signal. The test is terminated when the timer times out (S18) or the
&T0, H0, or Z command is issued. When the test is terminated, the three
digit error count is sent to the DTE. An OK result code follows the error
count.
RESULT CODE DESCRIPTION
OK If a test state is entered.
OK After error count is sent to DTE
ERROR If any other V.54 test is active (&T1, &T3,
&T6, &T7), or if on-line.