Black Box 32144, Manual

Page: 62 / 195

148
MODEM 32144
The ALBX test can be initiated
by using the modem’s front panel
controls, as explained in the
following paragraphs.
Make sure the local modem is
not in communication with the
remote modem, that the data rate
is the same as that of the DTE and
that the DTR circuit is on. (If TR is
present on the EIA status screen,
the DTR circuit is on.)
From screen 2 of the LCD MAIN
MENU, select TEST. Go to screen 2
of the LOCAL TEST menu and
select ALBX.
LOCAL MODEM
DATA TERMINAL EQUIPMENT
(DTE) AT LOCAL SITE
RECEIVER
EXTERNAL LOOPBACK
(LEASED LINE)
TRANSMITTER
Fig. 7-3. External Analog Loopback (ALBX) Test.