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Table 3-A Continued
Summary of Fault Symptoms and Potential Solutions
SYMPTOMS
Troubleshooting and Fault Clearing Procedures 25
PROBABLE CAUSES
The modem's internal
configuration is not correct for
the LIU port.
There is a faulty modem
eliminator.
There is a faulty modem.
The 25-pair cables are not
connected between the
LANlink SRU and the
cross-connect panel.
There is a LANlink fault.
The cable connections to the
LANlink line and the LIU port
do not conform to the system
configuration
CORRECTIVE ACTIONS
In the batch configuration file, the
port is defined as an ATA port.
Check that the modem's internal
configuration corresponds to the
port definition in the batch
configuration file. (For information
on the batch configuration file, see
450-1011-301, Part 13,
'Configuring ASCII Device
Services'.)
Test a modem eliminator by
substituting another one.
To test a modem, substitute a local
terminal with a modem eliminator.
After installation, take the LIU port
out of service using 'Courtesy
Down', and then put it back into
service. If the modem is the
problem, check that it is set at the
proper baud rate. Check that the LIU
is properly configured, and in the
'Working' state. Reset the modem. If
the problem persists, replace the
modem.
Connect the cables.
Investigate the LANlink SRU. (See
LANLINK FAULTS, later in this
table.)
Change the cabling to conform to
the configuration.
Practice 450-1011-501
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