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MIU Installation, Operation & Diagnostics Edition: January 25, 1999 Page 21
&T5 DENY RDL REQUESTS
The modem will not respond to a remote digital loopback request from a
distant modem. This will result in an error if the command is given while
any V.54 test is active (&T1, &T3, &T6, &T7 or &T8).
&T6 INITIATE REMOTE DIGITAL LOOPBACK (See Figure 4)
The command is valid only if the modem is in the command state with a
connection established.
Configure the modem under test with an AT&T4 command so that it will
honor a remote digital loopback request.
Enter AT&T6 at the local modem and it will send a remote digital
loopback request to the remote modem. After the RDL acknowledgement
signal is received from the remote modem, DSR is turned off (if &S1 is in
effect), the on-line state is entered, a CONNECT result code is sent to the
DTE, and the test timer is set to the value in S18.
If the local modem does not receive the RDL acknowledgment signal
from the remote end in three seconds, it sends an ERROR result code to
the DTE and returns to the command state. The local modem sends the
signal to release the remote digital loopback when the test is terminated.
The test may be terminated by the H0, Z, or &T0 command. The test will
also terminate when the test timer expires (sending the modem to the
command state) or carrier is lost (causing a NO CARRIER result code
and the modem to go on hook in the command state).
RESULT CODE DESCRIPTION
CONNECT When on-line state is entered.
ERROR If any V.54 test is active (&T1, &T3,
&T6-&T8).
ERROR If not in on-line command state.
ERROR If the RDL signal is not acknowledged.
&T7 INITIATE RDL WITH LOCAL SELF TEST (See Figure 5)