&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 |
MIU Installation, Operation & Diagnostics Edition: January 25, 1999 | Page 23 |