NEC Neax 2400 Ipx System Operations And Maintenance Manual
Have a look at the manual NEC Neax 2400 Ipx System Operations And Maintenance Manual online for free. It’s possible to download the document as PDF or print. UserManuals.tech offer 1168 NEC manuals and user’s guides for free. Share the user manual or guide on Facebook, Twitter or Google+.
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) card is controlled by the PM in that line circuit card. The line circuit cards are controlled from the CPU via the MUX. Figure 5-1 shows the control route of line circuit cards.
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 TSW00/TSW01 (TSW10/TSW11) TSW02/TSW03 (TSW12/TSW13) TSW02/TSW03 (TSW12/TSW13) TSW00/TSW01 (TSW10/TSW11) TSW01(11)TSW02(12)TSW03(13) IOGT GT GT TSW00(10) Ether ISAGT-AISAGT-B Control Signal ISW-LN TSW CA-n Cables Control Signal Control Signal Control Signal Control Signal Control Signal Control Signal : Circuit Card : Speech Path < LN: Local Node > TSW MUX GT ISAGT-A ISAGT-B LANI < ISW: Inter-node Switch > TSW HSW IOGT ISAGT LANI: PH-SW12 : PH-PC36 : PH-GT09 : PZ-GT13 : PZ-GT20 : PZ-PC19 : PU-SW00 : PU-SW01 : PH-GT10 : PZ-GT13 : PZ-PC19 term term term term
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 spare. When BL lamp for each line is flashing or illuminating on the LC circuit cardConfirm MB switch of the LC circuit card is in ON position (UP side). Use MBST command to confirm LC circuit card has not been placed into make-busy state. Use ASDT command to check the station data assignment. Replace the LC circuit card with a spare. ATTENTIONContents Static Sensitive Handling Precautions Required START A
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 heard.Replace the LC circuit card with a spare. ATTENTIONContents Static Sensitive Handling Precautions Required A END
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 side and to the system side. Connect the test telephone to the system side. Repeat station-to-station connections and check to see if the connection is established normally. When the dialed station is called The station telephone set is faulty. Replace the station telephone set with a spare. When a wrong connection occursReplace the LC circuit card with a spare. AT T E N T I O NContents Static Sensitive Handling Precautions Required START END
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 wiring side and to the system side. Connect the test telephone to the system side. Call the faulty line by station-to-station calling and check to see if the bell rings. When the bell does not ring Replace the LC circuit card with a spare. When the bell rings The in-house wiring side is faulty. Confirm that the A wire is not short-circuiting with ground. ATTENTIONContents Static Sensitive Handling Precautions Required START END
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 made Replace the telephone set with a spare. When speech cannot be made Replace the LC circuit card with a spare. ATTENTIONContents Static Sensitive Handling Precautions Required START END
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 line is flashing or illuminating on the ELC circuit cardConfirm that MB switch of the ELC circuit card is in ON position (UP). Use MBST command to confirm that ELC circuit card has not been placed into make- busy state. Use ASDT command to check the station data assignment. Replace the ELC circuit card with a spare. ATTENTIONContents Static Sensitive Handling Precautions Required END START
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 any abnormality. Replace the D term with a spare. AT T E N T I O NContents Static Sensitive Handling Precautions Required A END
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 command) and Route Restriction Data (assigned via ARSC/ARSCN command). (3) Three-Way Conference Trunk (CFT) is on the MUX (PH-PC36) circuit cards. If a three-way conference call cannot be established, check the MUX cards. (4) If the present timing for supervising the trunk/sender status is considered to be responsible for the fault, change the timing. The specifications for timings that can be changed with respect to trunks and senders are shown in Table 5-4 and Ta b l e 5 - 5. Table 5-3 Trunk Fault Situation TRUNK FAULTY SITUATION REFERENCE SECTION ORT No connection can be set up. PB/DP signals are erroneously received or cannot be received.Section 2.3, Trunk (ORT, SND, CFT) Fault SND No connections can be set up. PB/DP signals are erroneously sent out or cannot be sent out. CFT No connections can be set up. No three-way calling can be made. Noise gets in a established connection. COT TLT DTINo connections can be set up. A connection results in no speech. Noise gets in an established connection.Section 2.4, Trunk (COT, TLT, DTI) Fault