0049-0867-01X 2
nd
Generation MIU14.4L – USER’S GUIDE 6/22/2011
Rev. A
Page 30 of 39
&T7 INITIATE RDL WITH LOCAL SELF TEST (See Figure 5)
This is a system test, end to end.
The command is valid only if the modems are in the command state with a connection
established.
Configure the remote modem with an AT&T4 command so that it will honor a remote digital
loopback request.
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.
Summary of Contents for Telenetics MIU14.4L
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Page 41: ...0049 0867 01X 2 nd Generation MIU14 4L USER S GUIDE 6 22 2011 Rev A Page 37 of 39 NOTES ...
