NEC Neax 2000 Ivs2 Maintenance Manual

							CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
NEAX2000 IVS2 Maintenance Manual    
ND-70926 (E), Issue 1.0   Page 93
PN-2CSIA (CSI)
[For North
America/
Latin America]OPE lamp is not 
onD channel link is 
not connected 
between CSH 
and CSIConfirm the programming data: 
CM06 Y=10.
Confirm if the corresponding  
CSH card is removed.
If the fault cannot be cleared, 
replace the card.
B00-B12 lamp is 
flashingZT is not 
connected to the 
corresponding 
circuit No. Confirm the programming data: 
CM06, CM10, CMAD.
Confirm cable connection and the 
power switch of the correspond-
ing ZT.
Confirm if the corresponding ZT 
is in make-busy status  
PN-2CSIA-A
(CSI)
[For Australia/
Others]OPE lamp is not 
onD channel link is 
not connected 
between CSH 
and CSIConfirm the programming data: 
CM06 Y=10.
Confirm if the corresponding  
CSH card is removed.
If the fault cannot be cleared, 
replace the card.
B00-B12 lamp is 
flashingCS is not 
connected to the 
corresponding 
circuit No. Confirm the programming data: 
CM06, CM10, CMAD.
Confirm cable connection and the 
power switch of the correspond-
ing CS.
Confirm if the corresponding CS 
is in make-busy status  
 PN-M03(M03)  OPE lamp is not
 onAbnormal con-
nection with the 
DPC Confirm the connection with DPC 
card.
If the fault cannot be cleared, 
replace the card.
Table 2-6  Remedial Action on Each Lamp Status (Continued)
CARD NAME LAMP STATUSFAU LT
CONTENTREMEDIAL ACTION
1
2
3
1
2
3
1
2
3
1
2
3
1
2 
						

							 NEAX2000 IVS2 Maintenance ManualPage 94  ND-70926 (E), Issue 1.0
CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
PN-M10 (M10) CK0 lamp is not 
onCable connec-
tion failure 
between Digital 
Trunk Interface 
and No. 0 circuit 
of M10Check to see if the cable between 
Digital Trunk Interface and M10 is 
correctly connected.
Check the switch setting of M10.
If the fault cannot be cleared, 
replace the card.
CK1 lamp is not 
onCable connec-
tion failure 
between Digital 
Trunk Interface 
and No. 1 circuit 
of M10Check to see if the cable between 
Digital Trunk Interface and M10 is 
correctly connected.
Check the switch setting of M10.
If the fault cannot be cleared, 
replace the card.
TALM lamp is on Optical output 
line faultCheck to see if the cable between 
Digital Trunk Interface and M10 is 
correctly connected.
Check the switch setting of M10.
If the fault cannot be cleared, 
replace the card.
RALM lamp is on Optical input line 
faultCheck to see if the optical cable 
between the own side M10 and 
the remote side M10 is correctly 
connected.
Check the switch setting of own 
side M10 and remote side M10.
If the fault cannot be cleared, 
replace the card.
Table 2-6  Remedial Action on Each Lamp Status (Continued)
CARD NAME LAMP STATUSFAU LT
CONTENTREMEDIAL ACTION
1
2
3
1
2
3
1
2
3
1
2
3 
						

							CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
NEAX2000 IVS2 Maintenance Manual    
ND-70926 (E), Issue 1.0   Page 95
Troubleshooting by Contents of Complaint
This section describes the troubleshooting method when you receive a complaint of a problem
from a station user or an operator. Select the appropriate section corresponding to the problem
in Figure 2-4 and perform the troubleshooting.
Figure 2-4  Sections for Troubleshooting Procedure
Complaint from Station User/Operator
Station Line Fault   (Page 98)
(1) At Calling Station
(2) At Called Station
C.O. Line/Tie Line Fault   (Page 101)
(1) On Outgoing Call
(2) On Incoming Call
(3) On Answering Call
Power Failure Transfer (PFT) Fault  (Page 111)
D
term Fault   (Page 112)
ATTCON Fault   (Page 114)
DSS Console Fault    
(Page 116)
ATTCON Self-Test Procedure    (Page 117) 
						

							 NEAX2000 IVS2 Maintenance ManualPage 96  ND-70926 (E), Issue 1.0
CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
EXPLANATION OF SYMBOLS IN TROUBLESHOOTING PROCEDURE
The following markings explain the instruction marks used in the troubleshooting procedures.
: With respect to the item indicated on the right side of this mark, perform a check
or the required work. If an abnormality is found, take the required remedial action,
such as repair, replacement, etc.
: Replace the equipment or device (considered to be the fault) indicated on the right
side of the mark with a spare and confirm the recovery of the fault.
HOW TO FOLLOW THE “TREE”
The troubleshooting procedure is explained in the form of a “Tr e e”. Troubleshooting can be per-
formed accurately, as well as efficiently, by following the related “Tr e e” path according to the in-
formation available on the fault. In the following information gives a step-by-step explanation
about how to use the “Tr e e .”
Step 1: The maintenance personnel gathers information concerning the fault and selects the
tree to use from Figure 2-4.
Step 2: In the selected tree, search the item concerned by checking the symptom one by one
following the tree downward from the “START” point. If the related item has not been
found, gather more detailed information concerning the fault.
Step 3: The items indicated by the   mark on the right side of the items concerned
suggest elements that are possibly responsible for the fault. Check each of these items.
If an abnormality is found, perform the necessary remedial action such as repair, re-
placement, etc.
Step 4: If the fault is not recovered after a check was made on the items indicated by the
 mark and necessary actions were taken, replace the circuit card(s) and oth-
er hardware indicated by the   mark with spare(s). In this case, every time
hardware is replaced with a spare, check whether the fault is recovered. CHECK
REPLACE
CHECK
CHECK
REPLACE 
						

							CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
NEAX2000 IVS2 Maintenance Manual    
ND-70926 (E), Issue 1.0   Page 97
Figure 2-5  How to Follow the “Tr e e”
START
END
Symptom
Step 2
CHECK
REPLACEStep 3-1
(1)
Step 3-2
(2)
Step 4-1
(1)Step 3-3
(3)
Step 4-2
(2) 
						

							 NEAX2000 IVS2 Maintenance ManualPage 98  ND-70926 (E), Issue 1.0
CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
STATION LINE FAULT
(1) At Calling Station
Side Tone cannot be heard. (1) On the MDF, connect a test 
telephone set to the faulty station 
line.
(2)  If Side Tone is heard, check for 
trouble with the cabling and 
telephone set.
(3)  If no Side Tone is heard, check for 
trouble with wiring on the MDF and 
LC card.
(1) LC card
(2) Telephone set
Dial Tone is not returned.
The station telephone 
set is DTMF type.(1)  System Data Programming for 
DTMF Receiver: CM10, CM45 Y=0 
NOTE:Addition of an RST requires a
system reset.
(2)  System Data Programming for the 
station: CM10, CM12 Y=00
System does not 
receive any digits 
dialed by the station.(1)  MB switch on the FP card is set 
downward.
(2)  RUN lamp on the FP or MP card is 
flashing.
(1) FP card
(2) MP card START
ACHECK
REPLACE
CHECK
CHECK
REPLACE 
						

							CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
NEAX2000 IVS2 Maintenance Manual    
ND-70926 (E), Issue 1.0   Page 99
After dialing the first digit, Dial 
Tone is not disconnected.
At DTMF telephone set (1)  System Data Programming for the 
station: CM12 Y=00
(1)  PBR card (DTMF Receiver)
(2) LC card
(3) Telephone set
At any type of 
telephone set(1)  System Data Programming for the 
station: CM12 Y=00
(1) LC card
(2) Telephone set
END
A
CHECK
REPLACE
CHECK
REPLACE 
						

							 NEAX2000 IVS2 Maintenance ManualPage 100  ND-70926 (E), Issue 1.0
CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
(2) At Called Station
At the called station, the tele-
phone does not ring.(1)  ON lamp on the PWR card is on.
(2)  Volume Control of the telephone 
set.
(1) LC card
(2) Telephone set 
(3) PWR card (In case all stations fail 
within same PIM.)
The call is routed to a station 
other than the dialed number.(1)  System Data Programming for 
destination station Number: CM10
(2)  Call Forwarding-All Calls feature is 
activated at the destination station.
Ringing Signal is not discon-
nected after going off-hook.(1) LC card
(2) FP card
(3) MP card 
(4) Telephone set START
END
CHECK
REPLACE
CHECK
REPLACE 
						

							CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
NEAX2000 IVS2 Maintenance Manual    
ND-70926 (E), Issue 1.0   Page 101
C.O. LINE/TIE LINE FAULT
(1) On Outgoing Call
After dialing the trunk access 
code, tone (Reorder Tone) is 
returned.
BL lamp on the trunk 
card is flashing.(1)  Make Busy Data (CME5) of the 
trunk. 
(2)  System Data programming for the 
trunk: CM10
BL lamp on the trunk 
card is on.(1)  Disconnect the trunk from the line 
on the MDF. 
(2)  If the lamp goes out, there is a 
problem with the Central Office/
Distant Office or Cable. 
(3)  If not, check for a problem with 
wiring on the MDF or the trunk 
card.
(1) Trunk card
No lamp indication on 
the trunk card(1)  System Data Programming for the 
station restriction service class: 
CM12 Y=01 START
A
CHECK
CHECK
REPLACE
CHECK 
						

							 NEAX2000 IVS2 Maintenance ManualPage 102  ND-70926 (E), Issue 1.0
CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
Dial Tone is not returned from 
distant office.
In case of COT card (1)  Disconnect the trunk from the line 
on the MDF. 
(2)  Connect a test telephone set to the 
C.O. line (distant office side) on the 
MDF. 
(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
In case of ODT card (1)  Disconnect the trunk from the line 
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
trunks are assigned for type V
operation.
A
B
CHECK
SW MDF
TRUNK
To Distant Office
Test Telephone Set
REPLACE
CHECK