Raymar 14.4 Installation, Operation & Diagnostics - page 22
0049-0300-XXX MIU/Power Port Series – USER GUIDE
08/04/2010
Rev. A
Page 18 of 26
Enter AT&T7 at the local modem and it will send a digital loopback request to the remote modem.
After the RDL acknowledgment signal is received from the remote modem, DSR is turned off (if
&S1 is in effect), the on-line state is entered, an OK result code is sent to the DTE, and the test
timer is set to the value in S18. While the test is active, the local modem sends a test message to
the remote modem and counts the errors in the received (looped back) signal. The modems stay in
the command state during the test. When the test is terminated (except by a loss of carrier), the
local modem sends the release signal to the remote modem, as in &T6, and reports the three-digit
error count to the DTE.
The information text is followed by an OK result code. The test is terminated by loss of carrier, or
an H0, &T0, or Z command, and by the S18 timer running out.
RESULT CODES
DESCRIPTION
OK
When command executed is started.
OK
After error count is sent to DTE (&T1, &T3, &T6, &T7 or &T8).
ERROR
If not in on-line command state.
ERROR
If the RDL signal is not acknowledged.
&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.