Northern Telecom DNC-50 Maintenance And Troubleshooting Manual page 34

28 Troubleshooting and Fault Clearing Procedures
Table 3-A Continued
Summary of Fault Symptoms and Potential Solutions
SYMPTOMS
LANLINK FAULTS
Practice 450-1011-501
PROBABLE CAUSES
The cable connections to the
LANlink line and the LIU port
do not conform to the system
configuration.
The LIU does not conform to
the system map.
The LIU is not in the 'Working'
state.
There is a defect in the LIU.
The LANlink SRU is not
seated properly.
The LANlink is not in the
'Working' state.
CORRECTIVE ACTIONS
Change the cabling to conform to
the configuration.
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, and power it up again. Then
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 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.
Power the system down and
reseat the LANlink SRU.
Take the LANlink out of service,
using the 'Courtesy Down' function
of SAS, and put it back into service.
Note: You cannot 'courtesy down'
your own terminal port or the
LANlink SRU to which it belongs