NEC Neax 2400 Imx System Operations And Maintenance Manual

CHAPTER 5 NDA-24238
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FAULT REPAIR PROCEDURES
12.3 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 MBR switch UP and
extract the card from its mounting slot.
Make switch settings on a new CCH/CCT
card.
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
DOWN.
Check whether the...

NDA-24238 CHAPTER 5
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FAULT REPAIR PROCEDURES
12.4 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 con-
nected or not. If the connection is found im-
proper, 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....

CHAPTER 5 NDA-24238
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FAULT REPAIR PROCEDURES
13. INTEGRATED SERVICE DIGITAL NETWORK (ISDN) LINE FAULT
This section explains the fault repair procedure when any of the faults shown in Table 5-12 occur to a specific
ISDN.
13.1 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 5-24, and check the cable connection.
13.2 ISDN Line Control
The DCH/PRT circuit card controls the signal link...

NDA-24238 CHAPTER 5
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FAULT REPAIR PROCEDURES
13.3 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.
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.
Check whether the fault...

CHAPTER 5 NDA-24238
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FAULT REPAIR PROCEDURES
13.4 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...

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FAULT REPAIR PROCEDURES
14. 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, in 
Chapter 4, for detailed instructions.Replace the EMA card...

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This page is for your notes. 

NDA-24238 CHAPTER 6
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SYSTEM OPERATIONS
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...

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SYSTEM OPERATIONS
1.2 How to Stop Alarm Indications
To stop the alarm indication, press ALM RST key on the TOPU or use the RALM command.
Note:If the RALM command is executed, the system messages that show the reason for the failure will be
cleared. Always print the indicated system message before using this command.
1.3 Alarm Indications on TOPU
The system has alarm lamps on the TOPU as shown in Figure 6-3. Ta b l e  6 - 1 lists the meaning of each
lamp.
Figure...

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SYSTEM OPERATIONS
1.4 Variable Alarm Indication
This feature allows PBX users to make a flexible change of system message output grades which range 0
to 3 and alarm lamp grades which consist of MJ, MN, SUP and NONE. Thus, the PBX users can give a
proper alarm grade to each system message according to their requirements. When assigning no data, the
default alarm grades are automatically adopted.
2. COLLECTION OF SYSTEM MESSAGES
System messages are collected in the...