NEC UNIVERGE SV9100 System Maintenance Manual page 20

Issue 1.0
Check PRG 22-04 to ensure that line is
programmed to ring on an installed station.
Assigned?
Program ring assignment a . . nd
Yes
End.
Corrected?
Perform the following tests:
1. Measure CO ring voltage with AC meter (100 Vac 20 Hz) at
the MDF.
2. Perform second initialization
3. Place external ringer in front of system on worst case CO line.
Check if customer can hear external ringer at times when the
system does not detect ringing on this line.
4. If problem is not solved, perform First Initialization and
replace CD-CP00. Test system using default program.
8
No or Intermittent CO/PBX Ring
Test to see if problem occurs on one
Yes
Ringing
No
test.
No
Return defective Multiline
Terminal for repair.
C1
line or several lines.
Several Lines
One Line
Occurrence?
Still have
Problem?
Cleared
See if affected lines can be
isolated to One G CD-
4COTA.
1 GCD-4COTA?
No
Check whether or not
affected lines can be i . s olated
to one chassis.
Yes
Controlling
Chassis?
UNIVERGE SV9100
See if problem occurs on all
Multiline Terminals Assigned
Ringing.
All Terminals
Not all terminals
Replace one terminal that has
problems.
Program station for off-hook and
day/night ring, deny DND feature, and test
Not Cleared
No
Yes
Reset/ Replace G CD-
No
Replace CAT 5 cable between
No
chassis.
System Maintenance
Occurrence?
again.
Yes
Corrected?
Done.
4COTA.
Yes
Corrected?
Done.