Raymar 2.4 MIU/PowerPort Series, Руководство по установке и эксплуатации

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0049-0300-XXX MIU/Power Port Series – USER GUIDE 08/04/2010
Rev. A Page 17 of 26
&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)
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.