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MODEM 32144
NOTE
The ALXST may result in
errors or may fail altogether
even where conditions are
satisfactory for normal
operation. This is because
the test channel presented
to the modem during the
ALXST
impairments of both the
inbound and out-bound
TRANSMITTER
PATTERN
GENERATOR
Fig. 7-4. External Analog Loopback Self Test (ALXST).
150
includes
all
channels (amplitude distor-
tion, delay distortion, noise,
etc.). The main purpose of
the ALXST is to verify that
the modem is connected to
the leased line and that the
leased
complete. The test is not
meant
suitability of the leased line.
EXTERNAL LOOPBACK
RECEIVER
PATTERN
DETECTOR
line
circuit
to
assess
the
(LEASED LINE)
is
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