Toshiba V.92 - Manual (Page 93)

93 Test Function
Testing procedure
5.375 x 8.375 ver 2.4.0
Local/analog/loopback test
Testing procedure
To conduct the loopback test:
1 Enter the following AT commands to set the modem to
normal mode:
AT&F\N0
Receive OK
2 Enter the following AT commands to select the local/
analog/loopback test:
AT&T1
You are now in the online state.
3 Enter characters from the keyboard as desired.
The characters you enter should be displayed on the
screen.
Computer Modem
Transmitter
Receiver
Transmission
Reception