NEC Neax 2400 Ipx System Operations And Maintenance Manual
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Page 391
NDA-24307 CHAPTER 5 Page 363 Issue 1 FAULT REPAIR PROCEDURES 1.1 Check Point When repairing a line fault, consider the following items: (1) Check alarm lamps on line circuit cards. (2) When an outgoing call cannot be originated to a specific line/trunk or when an incoming call cannot be terminated from a specific line/trunk, check Tenant Restriction Data (assigned via ATNR command) and Route Restriction Data (assigned via ARSC/ARSCN command). 1.2 Line Control Each line in a specific Line circuit (LC/ELC)...
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CHAPTER 5 NDA-24307 Page 364 Issue 1 FAULT REPAIR PROCEDURES Figure 5-1 Controlling LC/ELC Circuit Cards and Speech Path Control Signal MDF Ordinary Telephone/D LCPM LC Control SignalLT Cable LT CableLC/ELC LT Cable LT Cable LCOrdinary Telephone/D LCPMControl Signal LC/ELC Ordinary Telephone/D LC LC LT Cable LT CableLC/ELC Ordinary Telephone/D LCPM LC Control SignalLT Cable LT CableLC/ELC CPR (LN0)LANI CPUTo LN1 To LN2 To LN3 CPR ISAGT LANI CPU HSW ISW IMG0/1 (LN0) IMG2/3 (LN0) PM MUX MUX MUX MUX...
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NDA-24307 CHAPTER 5 Page 365 Issue 1 FAULT REPAIR PROCEDURES 1.3 Line Fault - When Dial Tone (DT) Cannot Be Heard Note:If a circuit card is replaced because only one line is faulty, no other lines in that circuit card can be used until the replacement is complete. When OPE lamp on the LC circuit card does not illuminateConfirm MB switch of the LC circuit card is in ON position (UP). Use ASDT command to confirm that station data in the LC circuit card is assigned. Replace the LC circuit card with a...
Page 394
CHAPTER 5 NDA-24307 Page 366 Issue 1 FAULT REPAIR PROCEDURES Check the faulty line on the MDF. Isolate the faulty line to the in-house wiring side and to the system side. Connect the test telephone to the system side and check to see if dial tone can be heard. When Dial Tone (DT) is heard Check the in-house wirings. Replace the station telephone set with a spare. When no DT or side tone is heardCheck LT cables. Replace the LC circuit card with a spare. When DT is not heard, but side tone can be...
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NDA-24307 CHAPTER 5 Page 367 Issue 1 FAULT REPAIR PROCEDURES 1.4 Line Fault - When Dialing Results in a Wrong Connection Note:If a circuit card is replaced because only one line is faulty, no other lines in that circuit card can be used until the replacement is complete. When a call addressed to a specific station has terminated to another stationCheck to see if Call Forwarding-All Calls data has been deleted. Check the faulty line on the MDF. On the MDF, isolate the faulty line to the in- house wiring...
Page 396
CHAPTER 5 NDA-24307 Page 368 Issue 1 FAULT REPAIR PROCEDURES 1.5 Line Fault - When Bell Does Not Ring Note:If a circuit card is replaced because only one line is faulty, no other lines in that circuit card can be used until the replacement is complete. Call the faulty station line by Station-to- Station calling and check to see if the bell of the telephone rings.Replace the telephone set and check to see if its bell rings. Check the faulty line on the MDF. Isolate the faulty line to the in-house...
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NDA-24307 CHAPTER 5 Page 369 Issue 1 FAULT REPAIR PROCEDURES 1.6 When Call Cannot Be Answered and Speech Cannot Be Made Note:If a circuit card is replaced because only one line is faulty, no other lines in that circuit card can be used until the replacement is complete. Check the faulty line on the MDF. Isolate the faulty line to the in-house wiring side and to the system side. Connect the test telephone to the system side. Call the faulty line by station-to-station calling. When speech can be...
Page 398
CHAPTER 5 NDA-24307 Page 370 Issue 1 FAULT REPAIR PROCEDURES 1.7 Dterm Fault Note 1:If a circuit card is replaced because only one line is faulty, no other lines in that circuit card can be used until the replacement is complete. When OPE lamp on the ELC circuit card does not illuminateConfirm that MB switch of the ELC circuit card is in ON position (UP). Use ASDT command to confirm that station data in the ELC circuit card is assigned. Replace the ELC circuit card with a spare. When BL lamp for each...
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NDA-24307 CHAPTER 5 Page 371 Issue 1 FAULT REPAIR PROCEDURES Check the faulty line on the MDF. Isolate the faulty line to the in-house wiring side and to the system side. Connect the test D term to the system side. Confirm speech by Station to Station calling. When no speech can be made Check LT cables. Replace ELC circuit card with a spare. When speech can be made Check to see if the modular plug is firmly connected with the D term. Check the wiring inside the rosette. Check the in-house wiring for...
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CHAPTER 5 NDA-24307 Page 372 Issue 1 FAULT REPAIR PROCEDURES 2. TRUNK FAULT This paragraph explains the fault repair procedure when a fault, shown in Table 5-3, has occurred to a specific trunk. 2.1 Check Point When repairing a trunk fault, consider the following items: (1) Check alarm lamps on trunk circuit cards. (2) When an outgoing call cannot be originated to a specific trunk or when an incoming call cannot be terminated from a specific trunk, check Tenant Restriction Data (assigned via ATNR...