Northern Telecom DNC-50 Maintenance And Troubleshooting Manual page 32

26 Troubleshooting and Fault Clearing Procedures
Table 3-A Continued
Summary of Fault Symptoms and Potential Solutions
SYMPTOMS
Practice 450-1011-501
PROBABLE CAUSES
The LIU port used by the
ASCII terminal is not properly
defined in the batch
configuration file.
The LIU does not conform to
the system map.
The LIU is not in the 'Working'
state.
The LIU port is not in the
Working' state.
There is a defect in the LIU.
CORRECTIVE ACTIONS
Ensure that the LIU port used by the
ASCII terminal is defined as an ATA
port in the batch configuration file.
(For information on the batch
configuration file, see
450-1011-301, Part 13,
'Configuring ASCII Device
Services'.)
Sign on as a System Administrator
and check that the LIU software
location in the system map matches
the physical location. Correct any
discrepancy.
Take the LIU out of service using
'Courtesy Down'. Then power down
the LIU, wait 10 s, power the LIU up
again, and use the Maintenance
Service to put the LIU back into
service.
If the LIU is properly configured, and
if this procedure fails to make it
operational, contact NT field
support.
Take the LIU port out of service
using 'Courtesy Down', and then put
it back into service using 'Put into
Service'. Check that the port goes
into the 'Working' state.
Take the LIU out of service using
'Courtesy Down', and run a
diagnostic test on it using
'Diagnose'. If it fails the test, and if
you find no evidence of any of the
other probable causes, then replace
the LIU.