Multi-Tech Systems MT5600BL - Manual (Page 103)

C Loopback Tests
95
6. Enter data from your keyboard. Typing multiple uppercase U characters is a
good way to send an alternating test pattern of binary ones and zeroes. Data re-
ceived by the remote modem enters its analog receiver, is converted to digital
data, is reconverted into analog, and then is transmitted back to your modem.
Your modem passes this test if the data received on your monitor is the same as
the data entered from your keyboard.
7. To exit the test, turn off the modems.
Jumper pins 2 and 3.
VOLUME
EIA RS232C LEASED LINE PHONE
POWER
VOLUME
EIA RS232C LEASED LINE PHONE
POWER
Modem
under test
Local
modem
Figure C-5. Back-to-back test connections.