NEC Neax 2400 Ipx System Operations And Maintenance Manual

NDA-24307 CHAPTER 3
Page 263
Issue 1
SYSTEM MESSAGES
This message displays when a grave failure occurs on the SDT (PA-SDTA/B) card. If this is issued, remember
the ACT/STBY change of the SDT card may be followed, as a result of fault detection in the optical fiber line
(see [33-E] message).
➀ MG (Module Group)
➁ Details on alarm
Note:Fault repair procedure on each alarm is shown on the next page.
1: XXXX 0000 0000 0000 2: 0000 0000 0000 0000 3: 0000 0000 0000 0000
➀ ➁
4: 0000 0000 0000 0000 5: 0000 0000...

CHAPTER 3 NDA-24307
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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...

NDA-24307 CHAPTER 3
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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....

CHAPTER 3 NDA-24307
Page 266
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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:...

NDA-24307 CHAPTER 3
Page 267
Issue 1
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
indicates 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...

CHAPTER 3 NDA-24307
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This page is for your notes. 

NDA-24307 CHAPTER 4
Page 269
Issue 1
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 (ISW/IMG 0).
1.1 Precautions
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 replaced.
As for switch setting on the circuit cards, confirm...

CHAPTER 4 NDA-24307
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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
Figure 4-1   Circuit Card Mounting Face Layout of LPM
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...

NDA-24307 CHAPTER 4
Page 271
Issue 1
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 Ta b l e  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, HFD
EMA CardSection 1.3.2, EMA Card Replacement Procedure
IOC...

CHAPTER 4 NDA-24307
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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). The CPR
is mounted in IMG 0 of LN and ISW. 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 HFD. Figure 4-2 shows the front view
of the CPR. Operate the related keys and connectors to replace the CPU with...