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7.0 Diagnostics
To run the test, go to the LCD MAIN MENU. From page 2 of the LCD MAIN
MENU, select TEST. This takes you to screen 1 of the LOCAL TEST menu,
where ST/E is visible as one of the selections. Select ST/E.
The SELFTEST W/ERROR screen is displayed, with ON and OFF as the
possible selections. Select ON to activate the test. The EIA status screen is
displayed. The ER indicator should flash every few seconds, indicating that
the pattern generator and detector are working. Errors are injected every few
seconds. To end the test, press the ENT pushbutton to return to the
SELFTEST W/ERROR screen. Then select OFF.
7.7.4 E
XTERNAL
A
NALOG
L
OOPBACK
(ALBX) T
EST
The external analog loopback test is available forB.
The ALBX test allows you to test the local modem and its associated terminal,
and to verify the availability of the leased-line circuit. The test circuit does not
include the remote modem. Figure 7-3 shows the connections automatically
made during the ALBX test.
Figure 7-3. External Analog Loopback Test (ALBX).
External loopback
(leased line)
Data terminal
equipment (DTE)
at local site
Local modem
Receiver
Transmitter
829 Block