Black Box Modem MD885A-R3 Manual de usuario descargar pdf (Pagina 122)

121

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

NALOG

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

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Black Box Modem MD885A-R3 Manual de usuario Pagina 122