NEC Neax 2400 Ipx System Operations And Maintenance Manual

NDA-24307 CHAPTER 5
Page 443
Issue 1
FAULT REPAIR PROCEDURES
12.2 When Faulty Circuit Cards Can Be Assumed From System Message
Faulty Situation:
When the system is down with message [0-C] ~ [0-J] indicated, faulty circuit cards can be assumed from
the message detail data. Replace circuit cards with spares.
Replace  faulty  circuit  card  with  a  spare. Set MB switch UP and extract the circuit card
from its mounting slot.
Make necessary switch settings on the new
circuit card.
Set the MB switch UP and...

CHAPTER 5 NDA-24307
Page 444
Issue 1
FAULT REPAIR PROCEDURES
13. COMMON CHANNEL INTEROFFICE SIGNALING (CCIS) LINE FAULT
This section explains the fault repair procedure when any of the faults shown in Table 5-13 occur to a specific
CCIS line.
13.1 Check Point
When repairing a CCIS Line fault, consider the following:
(1) Check alarm lamps on the CCH or CCT circuit card.
(2) Refer to Figure 5-25, and check the cable connection.
13.2 CCIS Line Control
The CCH/CCT circuit card controls the signal link...

NDA-24307 CHAPTER 5
Page 445
Issue 1
FAULT REPAIR PROCEDURES
13.3 Specific CCH/CCT Card Is Faulty
Check by replacing CCH/CCT card with
a spare.On CCH/CCT card, set the MBR switch UP.
On CCH/CCT card, set MB switch UP and
extract the card from its mounting slot.
Make switch settings on a new CCH/CCT
card, referring to the card extracted.
On new CCH/CCT card, set MBR and MB
switches UP and insert the card into its
mounting slot.
On new CCH/CCT card, set MB switch
DOWN.
On new CCH/CCT card, set MBR switch...

CHAPTER 5 NDA-24307
Page 446
Issue 1
FAULT REPAIR PROCEDURES
13.4 Fault of CCH, DTI and Related Flat Cable
Check connectors and flat cables between
DTI and CCH.On DTI cards, set MB switch UP. On CCH
card, set MBR switch UP.
Check the connector. Check whether the connector is correctly
connected or not. If the connection is found
improper, plug and unplug the connector a few
times.
On DTI cards, set MB switch DOWN. On CCH
card, set MBR switch DOWN.
Check whether the fault is still indicated.
Check the...

NDA-24307 CHAPTER 5
Page 447
Issue 1
FAULT REPAIR PROCEDURES
14. INTEGRATED SERVICE DIGITAL NETWORK (ISDN) LINE FAULT
This section explains the fault repair procedure when any of the faults shown in Table 5-14 occur to a specific
ISDN.
14.1 Check Point
When repairing an ISDN line fault, consider the following items:
(1) Check alarm lamps on the DCH or PRT circuit card.
(2) Refer to Figure 5-26, and check the cable connection.
14.2 ISDN Line Control
The DCH/PRT circuit card controls the signal link...

CHAPTER 5 NDA-24307
Page 448
Issue 1
FAULT REPAIR PROCEDURES
14.3 Specific DCH/PRT Card Is Faulty
Check by replacing the DCH/PRT card with
a spare.On DCH/PRT card, set MBR switch UP.
On DCH/PRT card, set MB switch UP and
extract the card from its mounting slot.
Make switch setting on a new DCH/PRT card,
referring to extracted card.
On new DCH/PRT card, set MBR and MB
switches UP and insert the card into its
mounting slot.
On new DCH/PRT card, set MB switch
DOWN.
On new DCH/PRT card, set MBR switch
DOWN....

NDA-24307 CHAPTER 5
Page 449
Issue 1
FAULT REPAIR PROCEDURES
14.4 Fault of DCH, DTI and Related Flat Cable
Check the connectors and flat cables
between DTI and DCH.
Check the connector. On DTI cards, set MB switch UP. On DCH
card, set MBR switch UP.
Check whether the connector is correctly
connected. If the connection is found improper,
plug and unplug the connector a few times.
On DTI cards, set MB switch DOWN. On DCH
card, set MBR switch DOWN.
Check whether the fault is still indicated.
Check the flat...

CHAPTER 5 NDA-24307
Page 450
Issue 1
FAULT REPAIR PROCEDURES
15. HARD TIME CLOCK FAULT
This section explains the procedure for repairing a hard time clock failure which occurs within the EMA card.
 
Replace the EMA card. 
If the EMA card is removed from the 
system while the system is in operation 
under the control of the CPU 1, the 
system will reset and stop all call 
processing. See Section 1.3.2, EMA 
Card Replacement Procedure, Chapter 
4, for detailed instructions.Replace the EMA card referring to...

NDA-24307 CHAPTER 6
Page 451
Issue 1
CHAPTER 6 SYSTEM OPERATIONS
To maintain the system in a normal state, maintenance technicians need to monitor the servicing status of the
system. Figure 6-1 shows the flow of the system status monitor.
When trouble occurs in any part of the system or to any phase of system operations, maintenance technicians
are alerted by an alarm indication or by a report from a station user or an operator. When the system becomes
overloaded, maintenance technicians can execute Line...

CHAPTER 6 NDA-24307
Page 452
Issue 1
SYSTEM OPERATIONS
1. ALARM INDICATIONS
When trouble occurs in the system, the system activates an appropriate remedial action (system changeover,
make-busy shift of the circuit card, restart processing, etc.) by executing the automatic diagnostic function.
Results of the action taken and the faulty situation are displayed.
1.1 Kinds of Alarm Indications
Figure 6-2 shows the kinds of alarm indications.
Figure 6-2   Alarm Indications
1.2 How to Stop Alarm Indications
To...