NEC Neax 2400 Imx System Operations And Maintenance Manual

							CHAPTER 3 NDA-24238
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SYSTEM MESSAGES
Repair Procedure
Depending on the fault status shown in data 
➁, perform necessary repair work:
(1) Hardware Failure/Onboard Power Alarm
SDT (PA-SDTA/B) card is faulty. Replace the card with a spare by referring to Chapter 4, Section 3.3.3,
SDT Card Replacement Procedure.
(2) Optical Line Failure
Diagnosis: In addition to this alarm, is the “PCM Loss” alarm also indicated?
YES→Optical line side is faulty.
Verify that the SDT card in the distant node is not placed into make-busy state. Also, perform the
light level check of the optical fiber cables.
NO→SDT card is faulty.
Replace the SDT card with a spare by referring to Chapter 4, Section 3.3.3, SDT Card Replace-
ment Procedure.
(3) Abnormal MB Key Operation
This alarm is indicated when the MB key on the PA-SDTA card is turned ON, even though the MBR key
has been on the OFF side. Place the MBR key UP (=ON) and then turn ON the MB key.
(4) PCM Loss
Abnormal state is detected on the optical line side. Verify that the SDT card in the distant node is not
placed into make-busy state. Also, perform the light level check of the optical fiber cables.
(5) 52M Interface Alarm
- Frame Alignment Loss
- Receiving Section Failure
- Mistake Rate Degradation
- Sending Section Failure
- Mistake Detection
Clock synchronization with the distant node might be lost, or a trouble might occur on the optical line
side. Check the PLO cards first in both self-node and distant node. When no fault is found, proceed with
the light level check of the optical fiber cables. 
						

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SYSTEM MESSAGES
(6) Receiving Path Failure/Receiving Path Error
Abnormal state is detected in the process of multiplexing the “Receive” signals. To restore this, perform
the following:
STEP 1 Initialization of SDT card (distant node)
Initialize the SDT card in the distant node, and observe the situation. If the fault is not restored,
proceed with STEP 2.
STEP 2 Initialization of SDT card (self-node)
Initialize the SDT card in the self-node, and observe the situation. If the fault is not restored,
proceed with STEP 3.
STEP 3 Replacement of SDT card
It cannot be confirmed which node side (self-node or distant node) is faulty. By referring to
Chapter 4, Section 3.3.3, SDT Card Replacement Procedure, first replace the SDT card only in
one of the nodes. When the fault does not recover, then also replace the SDT card in other side
of the nodes. 
(7) Pointer Failure/Sending Path Failure/Sending Path Error
Abnormal state is detected in the process of multiplexing the “Send” signals. To restore this, perform the
following:
STEP 1 Initialization of SDT card
Initialize the SDT card in the self-node, and observe the situation. If the fault is not restored,
proceed with STEP 2.
STEP 2 Replacement of SDT card
By referring to Chapter 4, Section 3.3.3, SDT Card Replacement Procedure, replace the SDT
card in the self-node with a spare. 
						

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SYSTEM MESSAGES
This message displays when the SDT (PA-SDTA/B) card or optical fiber line, which was once detected as
faulty, recovers.
➀ MG (Module Group)
➁ Details on the fault
1: X0XX 0000 0000 0000 2: 0000 0000 0000 0000 3: 0000 0000 0000 0000
➀ ➁
4: 0000 0000 0000 0000 5: 0000 0000 0000 0000 6: 0000 0000 0000 0000
7: 0000 0000 0000 0000 8: 0000 0000 0000 0000 9: 0000 0000 0000 0000
b7 b0
b7 b4 b3 b2 b1 b0
Default Alarm:
NON33-DSDT Alarm RestoreDefault Grade:
1Grade Modified: Lamp Modified:
b7: 0/1 = Even-number MG/Odd-number MG
b4, b3 b2-b0
0 0 0 0 0
0 0 0 0 1 Hardware Failure
0 0 0 1 0 Optical Line Failure
0 0 0 1 1 Onboard Power Alarm
0 0 1 0 0 Abnormal MB Key Operation
0 1 0 0 0
0 1 0 0 1 PCM Loss
0 1 0 1 0 Frame Alignment Loss
0 1 0 1 1 Receiving Section Failure
0 1 1 0 0 Mistake Rate Degradation
0 1 1 0 1 Sending Section Failure
0 1 1 1 0 Mistake Detection
1 0 0 0 0
1 0 0 0 1 Receiving Path Failure
1 0 0 1 0 Pointer Failure
1 0 0 1 1 Sending Path Failure
1 0 1 0 0 Receiving Path Error
1 0 1 0 1 Sending Path Error
b7: SDT Card Status
0/1=No. 0 System/No.1 System
SDT Card
Trouble
52M Interface
Alarm
VC-11 Path
Trouble 
						

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SYSTEM MESSAGES
This message displays when the ACT/STBY of the SDT (PA-SDTA) card is changed over as a result of fault
detection in the optical fiber line. When the ACT/STBY change cannot be performed, this message also indi-
cates the cause for the changeover execution failure.
➀ MG (Module Group)
➁ Detailed information
➂ Cause for changeover execution failure
Repair Procedure
Once this message displays, be sure to check other messages, such as [33-C] SDT Alarm Trouble, and review
the cause for the changeover. If any fault is implicated, repair the whole fault(s) according to the situation.
1: X0XX XX00 0000 0000 2: 0000 0000 0000 0000 3: 0000 0000 0000 0000
➀ ➁
4: 0000 0000 0000 0000 5: 0000 0000 0000 0000 6: 0000 0000 0000 0000
7: 0000 0000 0000 0000 8: 0000 0000 0000 0000 9: 0000 0000 0000 0000
b7 b0
b7 b6 b5 b4 b3 b2 b1 b0
b7 b6 b5 b4 b3 b2 b1 b0
Default Alarm:
NON33-ESDT Interface Change NotifyDefault Grade:
2Grade Modified: Lamp Modified:
b7: 0/1 = Even-number MG/Odd-number MG
b0: Active SDT after Changeover
0/1=No.0 System/No.1 System
b1: Operating Status of SDT
0/1=In service/Out of service 
b2, b3: Result of Changeover
0/1=Success/Failure
b7-b4
Cause for Changeover
0001 SDT had a serious failure
0010 MB key on SDT card was turned ON
0H: (Changeover Success)
1H: Optical interface isn’t dual
2H: Optical interface has a serious failure in each No.0/No.1 system 
						

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This page is for your notes. 
						

							NDA-24238 CHAPTER 4
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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
CHAPTER 4 Unit/Circuit Card Replacement Procedure
1. LPM Accommodating Unit/Circuit Card Replacement Procedure
This section explains how to replace unit/circuit cards mounted in the LPM.
1.1 Precaution
 Use this procedure to replace a faulty unit/circuit card with a spare or to check a spare card.
 There are functional switches (having set the default switch) on some of the circuit cards to be re-
placed. As for switch setting on the circuit cards, confirm the circuit card mounting face layout for the
LPM. When a circuit card with a default switch setting is replaced with a spare card, always make the
switch setting on the new circuit card the same as on the replaced card. Otherwise, electronic compo-
nents on the circuit card may be destroyed, or the circuit card itself may fail to function normally.
 When handling a circuit card, always use the field service kit for countermeasures against static elec-
tricity. Touching a circuit card without using the field service kit may destroy the card due to static
electricity on the human body.
1.2 Circuit Card Mounting Face Layout
Figure 4-1 shows the face layout of circuit cards mounted in the LPM. The circuit cards marked with *
are optional. 
						

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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
Figure 4-1   Circuit Card Mounting Face Layout of LPM Note:
In place of PZ-IO27, the CPR may be equipped with PZ-IO28, which does not have the MB
(Make-busy) key.
12
34
567
8
OFF
12
34
567
8
OFF
12
34
OFF
MBR
FDD ON
OFF
PALM
ON
OFF OUT PWR
IN PWR5AHDD SW
MB
SYSTEM SELECT0
SENSE SYSTEM SELECT1
SYSTEM SELECT2
CPURST
SLOT No.    0 1 2 3 4 5 6 STATUS IMG1 IMG2 IMG3 CPUOPE
WDTIMG0
ON
ON
ON4C026AE
12
34
567
8
OFF
12
34
567
8
OFF
12
34
OFF
MBR
FDD ON
OFF
ON
OFF OUT PWR
IN PWR5AHDD SW
MB
SYSTEM SELECT0
SENSE SYSTEM SELECT1
SYSTEM SELECT2
CPURST
SLOT No.    0 1 2 3 4 5 6 STATUS IMG1 IMG2 IMG3 CPUOPE
WDTIMG0
ON
ON
ON4C026AE
00 01 02 03 04
MISC MISC/IOC IOC(PH-IO24) EMA(PH-PC40)MISC
LPM
FRONT VIEW
CPR PZ-PW92
PZ-IO27LANI(PZ-PC19)GATE(PZ-GT16)
PALM
Note 
						

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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
1.3 Operating Procedures
The following paragraphs provide operating procedures to replace unit/circuit cards of the LPM. Perform
the operations that correspond to each Reference Item specified in Table 4-1.
Table 4-1  LPM Unit/Circuit Cards and Reference Items
UNIT/CIRCUIT CARD REFERENCE ITEM REMARKS
CPRSection 1.3.1, CPR Replacement ProcedureCPU, ISAGT, 
LANI
EMA CardSection 1.3.2, EMA Card Replacement Procedure
IOC CardSection 1.3.3, IOC Card Replacement Procedure
PWR UnitSection 1.3.4, Power Supply Unit Replacement Procedure
MISC CardSection 1.3.5, MISC Card Replacement Procedure
Improper key operations may result in a system down. Operate the key using extreme care.
During replacement of a circuit card, the system issues system messages and activates the related
alarm. Reset the indicated alarm after completing the replacement procedure.
If the indicated alarm is cleared via the RALM command, the system also clears the contents of the system
message. Before using the RALM command, print the messages using the DFTD command.
Use the ALM RST button only to reset the alarm lamps.WA RN I NG 
						

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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
1.3.1 CPR Replacement Procedure
This section explains how to replace the Control Processor Rack (CPR). Before
starting the procedures, make a backup copy of the main data, such as office data,
Call Forwarding (CF) data and Speed Calling (SPD) data, on to the hard disk of the
HFC. Figure 4-2 shows the front view of the CPR. Operate the related keys and con-
nectors to replace the CPU with a new one. Using a Phillips screwdriver, remove the four screws and
extract the CPR with care, as shown in Figure 4-3.
Figure 4-2   CPR Face Layout
AT T E N T I O NContents
Static SensitiveHandling
Precautions Required
12
34
567
8
OFF
12
34
567
8
OFF
12
34
OFF
MBR
FDD ON
OFF
ON
OFF OUT PWR
PALM
IN PWR5AHDD SW
MB
SYSTEM SELECT0
SENSE SYSTEM SELECT1
SYSTEM SELECT2
CPURST
SLOT No.    0 1 2 3 4 5 6 STATUS IMG1 IMG2 IMG3 CPUOPE
WDTIMG0
ON
ON
ON
4C026AE
PZ-IO27
PZ-PW92Note
Note:In place of PZ-IO27, the CPR may be equipped with PZ-IO28, which does not have the MB
(Make-Busy) key. 
						

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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
Figure 4-3   How to Replace the CPU
..... .....
12
34
567
812
34
567
812
345A
SLOT No.    0 1 2 3
45 6
26E
..... .....
12
34
567
812
34
567
8
12
345A
SLOT No.   
0
1
2
3
4
5
6
26E
CPR
LPM
PBX