NEC UNIVERGE SV9100 System Maintenance Manual page 24

Issue 1.0
Check PRG 22-04 to ensure that line is
programmed to ring on an installed
station.
Ringing
Assigned?
Program ring assignment
and test. . .
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 GCD-CP10.
Test system using default program.
2 - 8
No or Intermittent CO/PBX Ring
Test to see if problem occurs
on one line or several lines.
One Line
Yes
No
Cleared
No
Return defective Multiline
Terminal for repair.
C1
Several Lines
Occurrence?
All Terminals
Still have
Problem?
Not Cleared
See if affected lines
can be isolated to One
GCD-4COTB.
1 GCD-4COTB?
No
Check whether or not
affected lines can be
.
isolated to one chassis.
Yes
Controlling
Chassis?
UNIVERGE SV9100
See if problem occurs on
all Multiline Terminals
Assigned Ringing.
Occurrence?
Not all terminals
Replace one terminal
that has problems.
Program station for off-hook and
day/night ring, deny DND feature,
and test again.
No
Corrected?
Yes
Reset/ Replace
GCD-4COTB.
No
Corrected?
Replace CAT 5 cable
No
between chassis.
Yes
Done.
Yes
Done.