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Basic Troubleshooting and Repair
NSU/PRI Troubleshooting
If you cannot solve the problem using the following table, go through the
steps on page 240. If you still can’t find the problem, call Mitel Technical
Support.
Table 48: NSU Troubleshooting
Symptoms Probable Causes Corrective Action
Can’t make calls over NSU
trunks.
CIM Cabling CIM connection requires a CAT 5
crossover cable. Connect the
cable to the left CIM port on the
NSU only.
FIM Module
incompatible
FIM module in controller must be
the 1K version.
Incorrect switch
settings on back of
NSU
Single switch on left side should be
in the down position.
L0/L1 switches should have switch
#4 down
Switch #6 is typically in the up
position if connected to the CO.
If right L0/L1 LED is red (indicating
No sync) try changing Switch 6.
If left L0/L1 LED flashing green
(indicating Sync but D-channel is
not synchronized) ensure the
correct protocol is programmed via
IMAT.
Incorrect CDE or
IMAT programming
See “Programming an NSU or a
PRI Card in a Peripheral Cabinet”
on page 112“ for required
programming.
NOTE: Be sure to check
programming for all links.
Wrong NSU
software load
Check FCI for load requirements.
Wrong IMAT version Must be Release 7.3 or greater