NEC Neax 2400 Ipx System Operations And Maintenance Manual
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NDA-24307 CHAPTER 5 Page 373 Issue 1 FAULT REPAIR PROCEDURES Table 5-4 Timings for Trunks ITEMS FOR STATUS SUPERVISIONCONDITIONS FOR SUPERVISION TIMING SPECIFICATIONS 1 Detection of Call TerminationRing Down System Detection by ringing signal (20Hz) from the opposite office. Loop System Detection by loop from the opposite office. E&M System Detection by incoming signal (ground or –48V) on E (RG2) lead.Ringing signal of more than four cycles is detected within 800 ms. Detection within 16 ms after call termination. 2 Acknowledge Signal SendingWink Signal Delay Start160 ms (standard) Timing can be assigned using ARTD/ ARTDN command. 3 Detection of Release at the time of Incoming ConnectionE&M System Loop System288 ms (standard) 160 ms (standard) Timing can be assigned using ARTD/ ARTDN command. 4 Timing for Restricting Call Origination after ReleaseAfter release of the user’s trunk or the trunk at the opposite office has been detected, a new call origination is restricted.3070 ms (standard) Timing can be assigned using ARTD/ ARTDN command. 5 Seizure of Opposite OfficeLoop System Closure of DC loop. E&M System Supply of outgoing call signal (ground or –48V) onto M (DL) lead. 6 Detection of Acknowledge SignalWink Signal Delay StartTiming is assigned using ARTD/ ARTDN command. 7 Trunk Hold Time Even if answer signal has not reached from the opposite office, the call is regarded as answered.If DP Signal is 10 sec. (standard) after dial pulses are sent out Timing can be assigned using ARTD/ARTDN command. If PB Signal is 30 sec. (standard) after seizure of the trunk Timing can be assigned using ASYD SYS 1 Index 156 (only when 2nd Dial Tone System). 8 Detection of Release at the time of Outgoing ConnectionLoop System Detection of polarity reversal across tip and ring. E&M System Detection of Release Signal (ground or –48V) on E lead.608 ms (standard) Timing can be assigned using ARTD/ ARTDN command.
CHAPTER 5 NDA-24307 Page 374 Issue 1 FAULT REPAIR PROCEDURES Table 5-5 Timings for Senders ITEMS FOR STATUS SUPERVISIONCONDITIONS FOR SUPERVISION TIMING SPECIFICATIONS 1 Sender Acknowledge Wait Ti merTiming limit for waiting to receive connection acknowledgement signal from the opposite office after seizing the opposite office.4 sec. (standard) Timing can be assigned using ASYD SYS 1 Index 130 command. 2 Sender Prepause Timer Time from sender seizure till sending of the 1st digit where connection acknowledgment is made by interface with the opposite office.DP: 3 sec. (standard) PB: 2.5 sec. (standard) Timing can be assigned using ASYD SYS 1 Index 131 command. 3 Sender Inter-digit Timer Inter-digit timing for the numbers to be sent out by the sender.For DP 10 pps: 860 ms (standard) 20 pps: 460 ms (standard) Timing can be assigned using ASYD SYS 1 Index. 132 command. For PB 60 ms/120 ms (to be selected by ONSG of ARTD/ARTDN command.) Timing can be changed using ASYD SYS 1 Index 133 command.
NDA-24307 CHAPTER 5
Page 375
Issue 1
FAULT REPAIR PROCEDURES
2.2 Trunk Control
Trunk circuit cards are controlled from the CPU via the MUX. Each trunk line in a specific trunk circuit
card is controlled by the Port Microprocessor (PM) in a trunk circuit card. Figure 5-2 shows the control
route of the trunk circuit card.
Figure 5-2 Controlling Trunk Circuit Cards and Speech Path
Control Signal
MDF
TRKPM
TRK
Control Signal
ORT/SND
LT Cable
LT Cable
TRK
TRKPMControl Signal
COT/TLT
TRK
TRK
ORT/SND
TRKPM
TRK
Control SignalLT Cable
LT CableCOT/TLT
CPR
(LN0)LANI
CPUTo LN1 To LN2 To LN3
CPR
ISAGT
LANI
CPU
HSW
ISW IMG0/1 (LN0)
IMG2/3 (LN0)
PM
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
: 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
Network
CFT
CFT
Note
Note
Note: Eight CFTs are provided on the MUX
(PH-PC36) cards.
CHAPTER 5 NDA-24307 Page 376 Issue 1 FAULT REPAIR PROCEDURES 2.3 Trunk (ORT, SND, CFT) Fault 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 only one line is faulty Place the faulty line into make-busy state. For ORT/SND, set MB switch of each circuit to ON position. For CFT, place it into make-busy state using command MBTK. Replace the circuit card with spare. Set MB switch UP and extract the circuit card from its mounting slot. Set MB switch of the new circuit card UP and insert the circuit card into its mounting slot. Set MB switch DOWN. If the line is under make-busy state, cancel it. AT T E N T I O NContents Static Sensitive Handling Precautions Required START END
NDA-24307 CHAPTER 5 Page 377 Issue 1 FAULT REPAIR PROCEDURES 2.4 Trunk (COT, TLT, DTI) Fault Note 1:If a circuit card is replaced because only one line is faulty, any other lines in that circuit card cannot be used until the replacement is complete. Note 2:If the polarities of the external line is reversed, it is detected in the form of Trunk Ineffective Hold. When OPE lamp on the trunk circuit card does not illuminateConfirm that MB switch of the trunk circuit card is in ON position (UP side). Use ATRK command to confirm that trunk data in the trunk circuit card is assigned. Replace trunk circuit card with a spare. When BL lamp is flashing or illuminating on the trunk circuit cardConfirm that MB switch of trunk circuit card is in ON position (UP side). Use MBTK command to confirm that trunk circuit card has not been placed into make- busy state. Use ATRK command to check trunk data assignment. Replace trunk circuit card with a spare.AT T E N T I O NContents Static Sensitive Handling Precautions Required START A
CHAPTER 5 NDA-24307 Page 378 Issue 1 FAULT REPAIR PROCEDURES Check the faulty line on the MDF. If the C.O./Tie Line is in Loop Start system: Isolate the faulty line to C.O. side and to the system side. Connect the test telephone to the C.O. side. Note 3:Check can be made only on temporarily opened C.O./Tie Lines.Confirm that Dial Tone (DT) is heard and the call is connected to the destination party at the opposite office. Note 4:Cross connection methods are explained on the following pages.If C.O./Tie Line is any other type than Loop Start: By cross connections on the MDF, connect the faulty line to a normal trunk. By a designated connection from the ATTCON/DESKCON, seize the trunk connected with the faulty line. When the connection is not set up, the C.O./Tie Line is faultyAfter the trunk has been seized, check to see if a call can be originated. When the connection is set up Replace the D term with a spare. AT T E N T I O NContents Static Sensitive Handling Precautions Required A END
NDA-24307 CHAPTER 5 Page 379 Issue 1 FAULT REPAIR PROCEDURES Note: When performing loop-back connection tests on the trunks at the user’s office, provide cross connection as follows: (1) For a COT Set up a loop-back connection between the C.O. Trunk (COT) to be tested and station line. The trunk route must be assigned for Loop Start. (2) For a TLT (for DID) Set up a loop-back connection between the Tie Line Trunk (TLT) to be tested and another TLT. If the TLT is a Direct Inward Dialing (DID) Trunk, connect the related leads as shown below: If the TLT is a 4-wire E & M System, connect the related leads as shown below: AT T E N T I O NContents Static Sensitive Handling Precautions Required LC A LC B LC C COT LC ATLT LC BTLT TLTRTLTR TT TLT RR TT M M EERR TT Receive SendTLTReceive Send
CHAPTER 5 NDA-24307 Page 380 Issue 1 FAULT REPAIR PROCEDURES If the TLT is a 2W E & M System, connect the related leads as shown below: (3) For a DTI Set up a loop-back connection between the DTI Trunk to be tested and another DTI Trunk as shown below: When the loop-back test is performed at the time of PCM LOSS, FRM LOSS, or MERM LOSS alarm lamp (red) illuminates. If the alarm lamp goes out, the DTI circuit card side is normal. When only one DTI circuit card is to be checked, make the following connections and confirm that no alarm lamps illuminates. AT T E N T I O NContents Static Sensitive Handling Precautions Required TLTR TLTR TT MM EE LC ADTI LC BDTI DTIRR R R T T T T Receive SendDTIReceive Send DTIRB RA TB TAReceive SendLoop-back Cross Connection
NDA-24307 CHAPTER 5 Page 381 Issue 1 FAULT REPAIR PROCEDURES 3. ATTCON/DESKCON FAULT This section explains the fault repair procedure when a specific Attendant/Desk Console is in any of the following faulty conditions. No speech can be made. No operations can be made. 3.1 Check Point When repairing an ATTCON/DESKCON fault, consider the following items: (1) Check the cable connections on the backplane. (2) When replacing the ATI circuit card for master ATTCON/DESKCON, the system is placed under Night Mode during replacement procedure. (3) When replacing the master ATTCON/DESKCON, the system is placed under Night Mode during replacement procedure. 3.2 ATTCON/DESKCON Control Each ATTCON/DESKCON is controlled from an ATI (PA-CS33) circuit card. The ATI circuit card is controlled from the CPU card via the INT on the TSW card. Figure 5-3 shows the control route of the ATI circuit card. The ATI (PA-CS33) circuit card is used as an interface card between the PBX and ATTCON/DESKCON. The card is mounted in slot numbers 12 or 23.
CHAPTER 5 NDA-24307 Page 382 Issue 1 FAULT REPAIR PROCEDURES Figure 5-3 ATT Connector Cabling and Connector Leads Accommodation LT5 LT11 PIM backplane MDFATTCON/ DESKCONLT11 is used when PA-CS33 is mounted in slot 23. LT5 is used when PA-CS33 is mounted in slot 12. 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 47 34 35 36 37 38 39 40 41 42 43 44 45 46 48BN4801 BN4800 BN4820 BN4821 TAS1B TAS1A BN4810 BN4830 BN4831BN4811 TAS0B TAS0A B2 A2 B3 A3 PA-CS33 Pin Assignment Installation CableInstallation Cablefor ATTCON/ DESKCON 0 for ATTCON/ DESKCON 1 for ATTCON/ DESKCON 0 for ATTCON/ DESKCON 1 0 - 1 0 - 1 Rosette Rosette