CHAPTER 2 TROUBLESHOOTING
ā 217 ā NWA-008847-001 Rev.3.0
a6ch2001.fm
No Dial Tone Connection on Tie
Line Incoming Call (only for the
2nd dial tone system)
(1) In case all Tie Line Trunks fail, check
if DTMF Receivers for Tie Line
Incoming Call are installed (only
when the signal kind of the trunk is
DTMF).
In case of ODT card (1) System Data Programming for the
trunk: CM35 Y=00, 09, 10
(2) Disconnect trunk from the line on the
MDF.
(3) To perform a Loopback Test, make a
back to back connect of the trunk and
another trunk within the system at the
MDF.
(4) If Dial Tone is returned when the call
is terminated to the original trunk,
there is a problem with the distant
office, the Carrier Equipment, or the
line.
(5) If not, check for trouble with wiring
on the MDF and the trunk card.
(1) Trunk card
A
B
CHECK
CHECK
~
MDF
DT ODT
ODT
E
M
E
M
REPLACE
FAULT DIAGNOSIS AND TROUBLESHOOTING
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