Multitech MT5600ZDX Benutzerhandbuch

4. Type AT&T6  and hit ENTER.  The local modem responds to this

command by transmitting an unscrambled marking signal, which causes

the remote modem to place itself in Digital Loopback mode.  Then the

local modem exits Command mode and enters pseudo On-line mode.

5. Type data from your keyboard. For this test, typing multiple upper

case "U" characters is a good way to send an alternating test pattern of

ones and zeros. The data received by the remote modem will enter its

analog receiver, be converted to digital data, be reconverted into

analog, and then looped through its transmitter back to the local

modem. Your modem passes this test if the data entered from the local

keyboard is the same as the data received on your monitor.