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Test Mode Operation
automatically verifies that the remote modem is looping the pattern back
(Table 7-5). Enter &T to exit RDL/TP and return to command mode.
Enter the O command to return online in data mode.
Exiting RDL/TP the modem responds with a three digit value between 0
and 255 representing the number of errors which occurred during test
pattern detection. If errors occurred repeat the test several times to
verify the consistency of the problem, then use the analog loopback tests
to isolate the problem.
Figure 7-5 Local Modem Initiating Remote Digital Loopback
Test Pattern %T
In Test Pattern, transmit data from the local DTE is blocked and
replaced by a V.52 compatible test pattern. When the modem transmits
the test pattern, it expects to receive the same pattern.
7-8
with Test Pattern
V.3400
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