Multitech V.90/K56FLEX MT5600ZDXV - Manual (Page 68)

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Models MT5600ZDX & ZDXV
modem. Your modem passes this test if the data entered from the
remote keyboard is the same as the data received on the remote
monitor.
Figure 4-2. Digital Loopback Test
(local/manual)
6. When testing is complete, you may end the test by typing an Escape
Sequence (+++) to bring your modem into Command mode. The
modem should respond with an OK message.
If you wish to stay On-line with the remote modem for normal data
transmission, type ATO0 and hit ENTER. If you wish to terminate the
call, type ATH0 and hit ENTER to hang up.
Digital Loopback Test/V.54 Loop 2 (Remote/
Automatic)
In this test, your modem must be On-line with another modem set up to
respond to a request for Digital Loopback (note that some modems may
not support Remote Loopback or may have this feature disabled). The
test procedure is as follows:
1. Go into Terminal mode. Type AT and hit ENTER; you should get an OK
message.
2. Dial the remote modem by entering the Dial command and the phone
number, to establish On-line mode. Note: The &T6 command must be
set on the remote modem to run this test.
3. Type the Escape Sequence (+++) which brings your modem into
Command mode, while still maintaining the connection with the remote
modem.