NEC Neax 2400 Ipx System Operations And Maintenance Manual
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![Page 471
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...](http://img.usermanuals.tech/thumb/54/84234/w64_nec-ipx-system-op-and-maint-ipx-u-type_d-470.png "Page 471
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...")
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 insert the circuit card into its mounting slot. Set the MB switch DOWN. Confirm that service connections such as station-to-station connection can be set up. START END
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 (digital) of the interoffice common channel signaling system and transmitting/receiving call processing information. The signal link controls permit normal transmission and reception of call processing information. A break in signal links is detected, then restored to establish signal links. The call processing information is converted into No. 7 signal format for channel 1 (any channel) of the DTI before being transmitted to a distant office. Figure 5-25 shows the CCIS line control route. Figure 5-25 Controlling CCIS Line Table 5-13 CCIS Line Fault Situation FAULTY SITUATION REFERENCE SECTION A specific CCH/CCT card is faulty.Section 13.3, Specific CCH/CCT Card Is Faulty When the signal transmission line is a digital line, transmitting/ receiving of control signals cannot be performed.Section 13.4, Fault of CCH, DTI and Related Flat Cable CPUTSW MUX CCH CCT DTI LT Cable Front CableMDF To CCIS Line LT Cable
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 DOWN. Check whether the fault is still indicated. START END
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 flat cable. On DTI cards, set MB switch UP. On CCH card, set MBR switch UP. Test the continuity of the flat cable. If found to be abnormal, replace the flat cable with a spare. On DTI cards, set MB switch DOWN. On CCH card, set MBR switch DOWN. Check whether the fault is still indicated. Check by replacing the DTI card with spare.On DTI card, set MB switch UP and extract the card from the mounting slot. On a new DTI card, make the switch setting, referring to the replaced card. On new DTI card, set MB switch UP and insert the card into the mounting slot. On new DTI card, set MB switch DOWN. Check whether the fault is still indicated. START END
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 (digital) of the ISDN line and transmits/receives call processing information. The signal link controls permit normal transmission and reception of call processing information. Figure 5-26 shows the ISDN line control route. Figure 5-26 Controlling ISDN Line Table 5-14 ISDN Line Fault Situation FAULTY SITUATION REFERENCE SECTION A specific CCH/CCT card is faulty.Section 14.3, Specific DCH/PRT Card Is Faulty When the signal transmission line is a digital line, transmitting/ receiving of control signals cannot be performed.Section 14.4, Fault of DCH, DTI and Related Flat Cable CPUTSW MUX DCH PRT DTI LT Cable Front CableMDF To ISDN Line LT Cable
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. Check whether the fault is still indicated. START END
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 cable. On DTI cards, set MB switch UP. On DCH card, set MBR switch UP. Test the continuity of the flat cable. If abnormal, replace the flat cable with spare. On DTI cards, set MB switch DOWN. On DCH card, set MBR switch DOWN. Check whether the fault is still indicated. Check by replacing the DTI card with a spare.On DTI card, set MB switch UP and extract the card from the mounting slot. On a new DTI card, make switch setting. On new DTI card, set MB switch UP and insert the card into the mounting slot. On new DTI card, set MB switch DOWN. Check whether the fault is still indicated. START END
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 Section 1.3.2, EMA Card Replacement Procedure, Chapter 4. START END WA RN I NG
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 Load Control. Figure 6-1 System Status Monitor SYSTEM OPERATIONS 1. ALARM INDICATIONS Alarm Lamps on Circuit Card Alarm Lamps on TOPU Alarm Lamps on ATTCON/DESKCON 2. COLLECTION OF SYSTEM MESSAGES 3. INDICATION OF LOCKOUT STATUS 4. LINE LOAD CONTROL 5. IOC LINE MONITOR 6. LINE MANAGEMENT Make-Busy/Make-Busy Cancel of Station Class/Number Change of Station and Data Terminal Make-Busy/Make-Busy Cancel of C.O./Tie Line 7. STATION MESSAGE DETAIL RECORDING SYSTEM (SMDR) 8. TRAFFIC MANAGEMENT 9. OFFICE DATA MANAGEMENT 10. TEST OPERATIONS OF VARIOUS KIND 11. ROUTINE DIAGNOSIS 12. SYSTEM CONTROL PROCEDURES Changeover/Make-Busy/Make-Busy Cancel of Equipment Initialization Pow e r O N / O F F System Star tup
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 stop the alarm indication, press ALM RST key on the TOPU or use the RALM/RALMN command. Note:If the RALM/RALMN 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. ALARM INDICATION TROUBLE SYSTEM MESSAGETOPU CIRCUIT CARDS ATTCON/DESKCON MAT SYSTEM DEDICATED PRINTER