Loopback Tests - Multitech MULTI MODEM II MT5600BL User Manual

MultiModemII User Guide
3. Following the instructions in Chapter 7, set both modems to two-wire leased-
4. Turn on both units and wait for carrier detect (CD).
5. On the modem under test, short pins 2 and 3 of the RS-232C connector with a
6. Enter data from your keyboard. Typing multiple uppercase U characters is a
7. To exit the test, turn off the modems.
Modem
under test
Local
modem
Figure C-5. Back-to-back test connections.
line mode. One should be set as the originate modem and the other as the an-
swer modem, but it does not matter which is which.
paper clip or other metal device.
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.
PHONE LINE LEASED
VOLUME
PHONE LINE LEASED
VOLUME
Jumper pins 2 and 3.
EIA RS232C
POWER
EIA RS232C
POWER
C Loopback Tests
91