Case Communications syncro 1496, Reference Manual

Page: 88 / 192

7.2 Test Details
7.2.1 Local Analogue Loopback
Using the Modem's Test Pattern Generator (Self-Test)
The modem's test pattern generator transmits a known message internally
through the modem and compares the message received with the message
sent. It then reports any errors, and displays an error count at the end of
the test.
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a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
PG = pattern generator
EC = error check
PG
EC
a a a a
a a a a
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a a a a
M
a a a a
a a a a
a a a a
a a a a
a a a a
D
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a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a
2-WIRE LINE
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a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a
LOCAL MODEM
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a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
M = modulator
D = demodulator
Using an External Test Source
An external source (terminal or test set) is used to generate a test pattern,
which must be checked when it returns to the external source.
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DTE a a a a a a
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103
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104
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a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a
2-WIRE LINE
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
M = modulator
D = demodulator
a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a
LOCAL MODEM
a a a a
a a a a
a a a a
a a a a
M
a a a
a a a
a a a
a a a
D
X450-310851 Issue 2 7-2 Rev.0