7.0 Diagnostics

7.7.5EXTERNAL ANALOG LOOPBACK SELF-TEST (ALXST)

The external analog loopback self-test is available for 4-wire leased line mode only.

The ALXST places the modem in analog loopback and causes data to be sent and received by an internal 511-bit pattern generator and receiver. No DTE or external BERT is necessary. As shown in Figure 7-4, the test circuit includes the leased lines (the external loopback).

NOTE

The ALXST may result in errors or may fail altogether even where conditions are satisfactory for normal operation. The test channel presented to the modem during the ALXST includes all impairments of both the inbound and outbound channels (amplitude distortion, delay distortion, noise, etc.). The main purpose of the ALXST is to verify that the modem is connected to the leased-line and the leased line circuit is complete. The test is not meant to assess the suitability of the leased line.

TRANSMITTER

RECEIVER

PATTERN

GENERATOR

PATTERN

DETECTOR

Figure 7-4. External Analog Loopback Self Test (ALBST).

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

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

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