NEC Neax 2000 Ivs2 Maintenance Manual

CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
NEAX2000 IVS2 Maintenance Manual    
ND-70926 (E), Issue 1.0   Page 103
(3)  If Dial Tone is returned after seizing 
the original trunk, there is a 
problem with the distant office, the 
Carrier Equipment, or the line. 
(4)  If not, check for trouble with wiring 
on the MDF and the trunk card.
Any dialed digit is not transmit-
ted to the distant office.(1)  System Data Programming for the 
trunk route: CM35 Y=01, 08, 20 
(2)  When the Sender...

 NEAX2000 IVS2 Maintenance ManualPage 104  ND-70926 (E), Issue 1.0
CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
After dialing the first digit, Dial 
Tone from the distant office is 
not disconnected.(1)  Appropriate signal (DP/DTMF) to 
distant office is transmitted. 
  System Data Programming for DP 
signal: CM35 Y=01, 13, 23, 25, 45 
  System Data Programming for 
DTMF signal: CM35 Y=01, 13, 24, 
26, 46
(2)  System Data Programming for 
Numbering Plan: CM20>A100-
A163,...

CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
NEAX2000 IVS2 Maintenance Manual    
ND-70926 (E), Issue 1.0   Page 105
(2) On Incoming Call
C.O. Incoming Call is not termi-
nated to ATTCON Station, DIT 
or TAS Buzzer.
BL lamp on the trunk 
card is not turned on.(1)  Disconnect the trunk from the line 
on the MDF. 
(2)  Connect a test telephone set to the 
line on the MDF. 
(3)  If the telephone rings, check for 
trouble with wiring on the MDF and 
the trunk card. 
(4)  If not, there is a...

 NEAX2000 IVS2 Maintenance ManualPage 106  ND-70926 (E), Issue 1.0
CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
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....

CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
NEAX2000 IVS2 Maintenance Manual    
ND-70926 (E), Issue 1.0   Page 107
The Tie Line Incoming Call/DID 
Call is routed to a different 
station other than the dialed 
station, or to Reorder Tone.(1)  System Data Programming for the 
trunk: CM35 Y=01, 17, 61-68
(1) Trunk card 
(2) FP card
(3) MP card
B
END
CHECK
REPLACE 

 NEAX2000 IVS2 Maintenance ManualPage 108  ND-70926 (E), Issue 1.0
CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
(3) On Answering the Call
Speech Path Trouble: 
No connection/One way 
connection(1)  Disconnect the trunk from the line 
on the MDF. 
(2)  To perform the Speech Path Test 
internally, make the following 
connection on the MDF according 
to type of card.  START
ACHECK
MDF
ODT
ODTE
M
E
M
MDF
COT
      
ATTCON
STATION PORT
 In Case of COT Card
 In Case of ODT Card 

CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
NEAX2000 IVS2 Maintenance Manual    
ND-70926 (E), Issue 1.0   Page 109
(3)  If the trouble remains, replace the 
trunk card. 
(4)  If not, there is a problem with the 
distant office.
(1) Trunk card 
(2) FP card
(3) MP card
Call is dropped (This condition 
excludes the Line Fault 
detected within a system).
When the station user 
flashes the switch-hook(1)  System Data Programming for the 
trunk: CM35 Y=16
When the failure 
occurs...

 NEAX2000 IVS2 Maintenance ManualPage 110  ND-70926 (E), Issue 1.0
CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
Transmission quality is not 
acceptable.
Noise/Distor tion (1)  Cabling between the PBX and the 
MDF or between the MDF and the 
lines is properly run to avoid 
induction from an AC power cable, 
motor or power supply equipment.
(1) Trunk card
(2) FP card
(3) MP card
(4) PWR card
Low Voice Level (1)  Loose connection of cables on the 
MDF
(1) Trunk card
(2) FP card
(3) MP...

CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
NEAX2000 IVS2 Maintenance Manual    
ND-70926 (E), Issue 1.0   Page 111
POWER FAILURE TRANSFER (PFT) FAULT
Preassigned stations are not 
connected to the C.O. line 
when system alarm or power 
failure has occurred.(1)  Cross connection on the MDF is 
properly made. 
(2)  Proper connection between the 
AUC card and the COT card
(1) AUC card
PFT operates without Power 
Failure or Emergency Alarm.(1) AUC card
(2) MP card START
END
CHECK
REPLACE...

 NEAX2000 IVS2 Maintenance ManualPage 112  ND-70926 (E), Issue 1.0
CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
Dterm FAULT
This troubleshooting procedure covers faults with the D
term function only. For other faults, see
Station Line Fault on Page 98.
All Keys on the D
term are 
ineffective.(1) Wiring on Modular Box (Rosette) 
(2) DLC card is properly mounted.
(3) System Data Programming for the 
D
term station: CM10, CM11, CM12, 
CM13, CM90, CM93 
(4) RUN lamp on the FP card and MP...