Black Box Modem MD885A-R3 Manual do Utilizador Página 126

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7.0 Diagnostics
Figure 7-5. Digital Loopback Test (DLB).
The DIGITAL LOOPBACK screen is displayed, with ON and OFF as the
possible selections. Select ON to activate the test. The EIA status screen is
displayed while the test is being conducted. Ensure that test data is being
generated and watch for data errors. By transmitting test data and comparing
it with the received copy, the DTE is checked for proper operation. To end
the test, press the ENT pushbutton to return to the DIGITAL LOOPBACK
screen. Then select OFF.
DATA TERMINAL EQUIPMENT
(DTE) AT LOCAL SITE
REMOTE
MODEM
RECEIVER
LOCAL MODEM
TRANSMITTER
RECEIVER
TRANSMITTER
REMOTE MODEM
LOCAL
MODEM
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