NEC NEAX 2000 IVS2 Maintenance Manual page 133

A
Dial Tone is not returned from
distant office.
In case of COT card
In case of ODT card
B
2
NEAX2000 IVS Maintenance Manual
ND-70926 (E), Issue 3.0
CHAPTER 2 TROUBLESHOOTING
(1) Disconnect the trunk from the line
CHECK
on the MDF.
(2) Connect a test telephone set to the
C.O. line (distant office side) on the
MDF.
SW
TRUNK
(3) If Dial Tone is returned by going off-
hook on the test telephone set,
check for trouble with wiring on the
MDF and the trunk card.
(4) If not, there is a problem with the
distant office or the C.O. line.
(1) Trunk card.
REPLACE
(1) Disconnect the trunk from the line
CHECK
on the MDF.
(2) To perform a Loop Back Test, make
a back to back connection of the
trunk card and another trunk within
the system at the MDF.
NOTE: This test only works when the
Fault Diagnosis and Troubleshooting
MDF
TO DISTANT OFFICE
TEST TELEPHONE SET
trunks are assigned for type V
operation.
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