Modem 34336

829 Block

External loopback

(leased line)

Transmitter

Receiver

Pattern

generator

Pattern

detector

Figure 7-2. Analog Loopback Self-Test (ALBST).

The SELFTEST 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. If ER is present on the front panel, data errors occurred. The ER indicator may flash on when the test is first started, but it should quickly go out and remain off until the end of the test.

To end the test, press the ENT pushbutton to return to the SELFTEST screen. Then select OFF.

7.7.3ANALOG LOOPBACK SELF TEST WITH ERRORS (ST/E)

In the analog loopback self test with errors, data is sent and received by an internal 511-bit pattern generator and receiver. No DTE or external BERT is necessary. This test differs from the ALBST in that errors are injected into the data flow every few seconds. The data flow is the same as that shown in Figure 7-2 (the ALBST).

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Black Box MD885C-R2, MD885AE-R2, MD885A-R3, 34336 user manual Analog Loopback Self-Test Albst

MD885C-R2, MD885A-R3, MD885AE-R2, 34336 specifications

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