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Overview
This chapter describes tests that can be invoked to isolate a trouble condition. The tests can isolate
a problem to the data connection, data set operation, or the DTE interface level. See
a sequence of tests for fault isolation.
Note
a.
On-line tests, which involve data transmitted from one modem to another, can be performed with the
modems operating in either synchronous mode or direct (N1) asynchronous mode. They cannot be
initiated until the modem has been in data mode for approximately 30 seconds.
b.
Once a modem is in Slave RDL, it ignores all requests other than AL.
c.
If an MRDL request does not get a response from the Slave modem at 2400 bps, the Master drops
the line.
Communication
line problem
Figure 6-1
060R122-000
Issue 15
Perform analog loopback
with self-test
FAIL
Local modem problem
Local terminal or local
FAIL
terminal-to-modem
connection problem
Perform remote digital
FAIL
loopback with self-test
at remote modem
FAIL
Remote modem
problem
FAIL
PASS
Pass
or
fail
Fault Isolation Sequence
SpectraComm Dual V.34 Modem
Installation and Operation
Chapter 6:
START
PASS
Pass
Perform analog loopback
or
fail
PASS
Pass
Perform remote digital
or
loopback with self-test
fail
PASS
Pass
Perform local digital
or
loopback with self-test
fail
PASS
Pass
Communication
or
line problem
fail
Remote terminal or remote
terminal-modem
connection problem
Tests
Figure 6-1
for
6-1
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