Multi-Tech Systems MT5634ZBAV Fax Machine User Manual


 
User Guide
132
Local Analog Loopback Test (V.54 Loop 3)
In this test, data from your computer or terminal is sent to your mo-
dem’s transmitter, converted into analog form, looped back to the mo-
dem’s receiver, converted into digital form, and then sent to your
monitor for verification. No connection to the phone line is required.
Computer or Terminal Local MultiModem
Digital Analog
AT&T1
CONNECT
UUUUUUUUU
UUU
Figure C-1. Local analog loopback test.
Test procedure
1. Connect the modem to your computer. Using your communication
program, set the desired baud rate and go into terminal mode.
2. Type AT&T1 and press ENTER. This places your modem in analog
loopback mode in the originate mode. A
CONNECT
message should
appear on your display. The modem is now out of command mode
and in a pseudo-online mode.
3. Note that the CD LED is on. If you are set for 14,400 bps or higher,
a speed LED should be on. If the CD LED is not on, there is a defect
in your modem.
4. Enter characters from your keyboard. For this test, typing multiple
uppercase
U
characters is a good way to send an alternating test
pattern of binary ones and zeros. The characters entered should be