Page 1 All rights reserved Printed in the United States of America Information is subject to change without notice. Nortel Networks Corporation reserves the right to make changes in design or components as progress in engineering and manufacturing may warrant. This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC rules, and the radio interference regulations of Industry Canada.
Page 3 July 1995 Standard, release 7.00. This document is reissued to include information from the international NTP to make a global NTP, Meridian 1 option 81C, and minor text edits. Changes are noted by revision bars in the margins. December 1995 Standard, release 8.00.
Page 4 August 1996 Standard, release 9.00. This document is reissued for text edits. Due to the extent of the changes, revision bars are not used. October 1997 Standard, release 10.00. This document is reissued to include information on the NT5D61 Input/Output Disk Unit with CD-ROM (IODU/C) card. June 1999 Standard, release 11.00.
Page 5: Table Of Contents
Circuit breakers and all column LEDs off (DC power) ... . Circuit breakers on but all column LEDs off (DC power) ..Meridian 1 Fault clearing...
Page 6 Contents Green LED off on module power supply (DC power) ... . Defective blower unit indicated (DC power) ....Main circuit breaker and all column LEDs off (AC power) .
Page 7 Disabled peripheral equipment card ......More than one peripheral equipment card disabled ....Meridian 1 Fault clearing...
Page 8 viii Contents Clearing trunk faults ......135 Trunk faults ..........Fault clearing procedures .
Page 9 Index ........185 Meridian 1 Fault clearing...
Page 10 Contents 553-3001-510 Standard 11.00 June 1999...
Page 11 Dual circuit breaker and associated module power supplies ..Figure 8 AC power cabling in rear of column ......Meridian 1 Fault clearing...
Page 12 List of figures 553-3001-510 Standard 11.00 June 1999...
Page 13 Trunk fault indicators ........Meridian 1 Fault clearing...
Page 14 List of tables Table 13 Attendant console fault indicators ......Table 14 Telephone fault indicators ........553-3001-510 Standard 11.00 June 1999...
Page 15: About This Document
About this document This document gives instructions for locating and clearing faults. The procedures in this document are based on the assumption that the Meridian 1 is properly installed (for example, all card locations, option switch settings, and cable connections are correct) and was fully operational before the fault.
Page 16 Page 2 of 190 About this document See the Meridian 1 installation and maintenance guide for: — Meridian 1 system installation procedures (553-3001-210) — Circuit card installation and testing (553-3001-211) — Telephone and attendant console installation (553-3001-215) — Meridian 1 general maintenance information (553-3001-500) —...
Page 17: How To Clear Faults
Page 3 of 190 How to clear faults Fault clearing process When a fault must be cleared in the Meridian 1, follow these steps: — Observe and record all fault indicators. System messages, visual fault indicators, maintenance display codes, and user reports identify many problems.
Page 18: Using This Document
Page 4 of 190 How to clear faults Using this document To use the information in this document, follow the steps below: Classify the fault by the indicators present (see “Fault indicators” on page 6). When multiple faults are indicated, clear them in the following order: •...
Page 19: Using Fault Indicators To Classify A Fault
If you find the CPU interface card is defective, you can disregard the remaining possible causes. Go to “Final maintenance procedure” on page 177—Follow the instructions in each step. Meridian 1 Fault clearing...
Page 20: Fault Indicators
Page 6 of 190 How to clear faults Fault indicators When there is a fault in the system, you may be notified by any combination of the following indicators: — system messages — visual fault indicators — maintenance display codes —...
Page 21: Table 2
BSD301, 401, 402 Peripheral equipment ERR4062 NWS301, 401, 501 OVD001–010, 024 XMI messages ERR090, 220, 270 Trunk OVD003, 008, 009, 010 TRK messages BSD501 Attendant console BSD501 Telephone ERR500 MWL500 NWS501 OVD001–002, 004, 005 XMI messages Meridian 1 Fault clearing...
Page 22: Visual Fault Indicators
Page 8 of 190 How to clear faults Visual fault indicators There are visual indicators on the Meridian 1 that can help you identify faults. These indicators include: — a major or minor alarm display on the attendant console: indicates a possible power, common equipment, or network equipment fault —...
Page 23: Maintenance Display Codes
Page 9 of 190 Maintenance display codes Maintenance displays are located on the faceplate of some Meridian 1 circuit cards. A maintenance display shows an alphanumeric code that can indicate the status of the system and aid in fault identification. Interpretations of the maintenance display codes are listed under “HEX”...
Page 24: Maintenance Display Locations And Related Fault Types
Page 10 of 190 How to clear faults Table 4 lists the cards with maintenance displays and the type of fault they might indicate. Table 4 Maintenance display locations and related fault types Maintenance display Type of fault QPC580 CPU Interface Card Common equipment QPC584 Mass Storage Interface Card NT9D34 Enhanced Mass Storage Interface...
Page 25: User Reports
You may also have the user reproduce the problem so you can determine the sequence of events that led to the fault. Table 5 lists typical problems reported by users and the type of fault they might indicate. Meridian 1 Fault clearing...
Page 26: User Reported Problems And Related Fault Types
Page 12 of 190 How to clear faults Table 5 User reported problems and related fault types User report Type of fault Major alarm reported by attendant Power No ring on 500/2500 telephones Major alarm reported by attendant Common equipment Minor alarm reported by attendant Network equipment Cannot transfer or conference...
Page 27: Accessing The System
The Multi User Login feature, available with X11 release 19, allows more than one device to interact with the Meridian 1. Refer to X11 system management applications (553-3001-301) for detailed information on using this feature.
Page 28 Page 14 of 190 Accessing the system Procedure 2 Access through the system terminal Press the return key. — If the response is a period (.), you are ready to log in to the system. — If the response is OVL111 nn TTY x or OVL111 nn SL1 someone else is logged in to the system.
Page 29: Access Through The Maintenance Telephone
(for example, to enter LD 42 return, key in 53#42##). Table 6 shows the translation from a terminal keyboard to a telephone dial pad. Note: To use the maintenance telephone, the peripheral equipment loop for that telephone must be operating. Meridian 1 Fault clearing...
Page 30: Table 6
Page 16 of 190 Accessing the system Table 6 Translation from keyboard to telephone dial pad Keyboard Dial pad Space or # Return • • Note: There is no equivalent for Q or Z on a dial pad. 553-3001-510 Standard 11.00 June 1999...
Page 31 **** Load a program by entering: 53#xx## “xx” represents the number of the program Perform tasks. Enter **** to exit the program and return the telephone to call processing mode. Background routines are then loaded automatically. Meridian 1 Fault clearing...
Page 32 Page 18 of 190 Accessing the system 553-3001-510 Standard 11.00 June 1999...
Page 33: Clearing Power Faults
Green LED off on module power supply (AC power) ... . . Defective blower unit indicated (AC power) ....Meridian 1 Fault clearing...
Page 34: Power Faults
Page 20 of 190 Clearing power faults Power faults Various electrical voltages are required to power the Meridian 1. These electrical voltages are developed and delivered by the power equipment system. Cooling and monitoring devices are interconnected with the power system.
Page 35: Power Equipment-Option 21A
Power equipment—option 21A Column LED Top cap fans Thermostat CE/PE power supply Front of the column Backplane NT7D15 System Monitor (paddle board) Power distribution unit Main circuit breaker (behind pedestal grill) Rear of the column 553-3042 Meridian 1 Fault clearing...
Page 36: Internal Dc Power Equipment
Page 22 of 190 Clearing power faults Figure 2 Internal DC power equipment Thermostat and Column LED air probe PE power supply PE power supply Ringing generator PE power supply System Circuit monitor breakers Power distribution unit in the rear CE power supply of the pedestal Blower unit...
Page 37: Internal Ac Power Equipment (Except Option 21A)
PE power supply Ringing generator MPDU PE power supply MPDU System Main circuit monitor breaker Power distribution unit in the rear CE power supply of the pedestal MPDU Blower unit (with circuit breaker) Front of the column 553-3044 Meridian 1 Fault clearing...
Page 38: Fault Clearing Procedures
Page 24 of 190 Clearing power faults Fault clearing procedures System messages with the mnemonic PWR (power) contain four fields of information about power equipment. These fields identify the type of equipment indicated (such as the blower unit) and the source of the message (system monitor, module, or module power supply).
Page 39: Figure 4
Power equipment designations Module 3 Power unit 1 Module 2 Power unit 1 Power unit 2 Module 1 Power unit 1 Module 0 Power unit 1 Column 0 System monitor 0 Front of the column, covers removed 553-3014 Meridian 1 Fault clearing...
Page 40: Power Fault Indicators
Page 26 of 190 Clearing power faults Table 8 lists common power fault indications. To clear faults, select the symptom that most resembles the fault indications, then go through the procedure for clearing each possible cause until the fault is fixed. Once the fault is corrected, disregard the remaining possible causes.
Page 41: Main Circuit Breaker And All Leds Off (Option 21A)
Note: High room temperature or a power surge can shut down the system. Check the temperature of the room and voltages at the commercial power outlet. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Thermostat harness: NT8D46AC —...
Page 42: Main Circuit Breaker On But All Leds Off (Option 21A)
All the LEDs in the system are off but the main circuit breaker on the PDU is not tripped. Use this procedure to clear the problem. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: —...
Page 43: Green Led Off On Module Power Supply (Option 21A)
The green LED is off on the CE/PE power supply, but the main circuit breaker on the PDU is not tripped. Use this procedure to clear the problem. You may need to replace the NT7D14 CE/PE Power Supply. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). Possible cause...
Page 44: Circuit Breakers And All Column Leds Off (Dc Power)
Note: High room temperature can shut down the system. If all columns in a multi-column system are shut down, check for this external condition. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Air filter: P0699798 —...
Page 45 If the breakers do not trip immediately, check the air filter: — If the filter is dirty and undamaged, clean the filter as described in Meridian 1 general maintenance information (553-3001-500) . — If the filter is damaged in any way, replace the filter as described in Meridian 1 hardware replacement (553-3001-520).
Page 46: Circuit Breakers On But All Column Leds Off (Dc Power)
All the LEDs in a column are off but the circuit breakers on the PDU are not tripped. Use this procedure to clear the problem. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: —...
Page 47: Green Led Off On Module Power Supply (Dc Power)
You may receive a system message indicating the status of the power supply. See “PWR” in the X11 system messages guide and use this procedure to clear the problem. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). Possible cause...
Page 48: Dc Power Cabling In Rear Of Column
Page 34 of 190 Clearing power faults Figure 6 DC power cabling in rear of column Main power connector to next module I/O safety panel Module power connectors MODULE 1 Main power connector to next module I/O safety Module power panel connectors MODULE 0...
Page 49: Defective Blower Unit Indicated (Dc Power)
See “PWR” in the X11 system messages guide and use this procedure to clear the problem. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Blower unit: NT8D52DD —...
Page 50: Main Circuit Breaker And All Column Leds Off (Ac Power)
Note: High room temperature or a power surge can shut down the system. If all columns in a multi-column system are shut down, check for these external conditions. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Air filter: P0699798 —...
Page 51 If the breakers do not trip immediately, check the air filter: — If the filter is dirty and undamaged, clean the filter as described in Meridian 1 general maintenance information (553-3001-500) . — If the filter is damaged in any way, replace the filter as described in Meridian 1 hardware replacement (553-3001-520).
Page 52: Main Circuit Breaker On But All Column Leds Off (Ac Power)
All the LEDs in the column are off but the main circuit breaker on the PDU is not tripped. Use this procedure to clear the problem. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: —...
Page 53: Breaker Off On Mpdu (Ac Power)
You may receive a system message indicating the status of the breaker. See “PWR” in the X11 system messages guide and use this procedure to clear the problem. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). Possible cause...
Page 54: Dual Circuit Breaker And Associated Module Power Supplies
Page 40 of 190 Clearing power faults Possible cause Action If both circuit breakers are tripped: — Unseat both power supplies, then reset the breakers. — If either breaker or both breakers trip, replace the MPDU. If the breakers do not trip, set them to OFF (down): —...
Page 55: Green Led Off On Module Power Supply (Ac Power)
You may receive a system message indicating the status of the power supply. See “PWR” in the X11 system messages guide and use this procedure to clear the problem. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). Possible cause...
Page 56: Ac Power Cabling In Rear Of Column
Page 42 of 190 Clearing power faults Figure 8 AC power cabling in rear of column Main power connector to next module Module power I/O safety connectors panel MODULE 1 Main power connector to next module Module power connectors I/O safety panel MODULE 0 Main power...
Page 57: Defective Blower Unit Indicated (Ac Power)
See “PWR” in the X11 system messages guide and use this procedure to clear the problem. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Blower unit: NT8D52AB —...
Page 58 Page 44 of 190 Clearing power faults 553-3001-510 Standard 11.00 June 1999...
Page 59: Clearing Common Equipment Faults
IODU/C not operating ........Meridian 1 Fault clearing...
Page 60: Common Equipment Faults
Common equipment faults Common equipment (CE) functions perform system control and switching. Common equipment in the Meridian 1 can include: — Bus Terminating Unit (BTU): provides logical termination to CPU and network buses (options 51, 51C, 61, 61C, 71, 81, and 81C) —...
Page 61: Fault Clearing Procedures
After the fault is corrected, go to “Final maintenance procedure” on page 177 to completely restore normal operation. WARNING Module covers are not hinged; do not let go of the cover. Lift the cover away from the module and set it out of your work area. Meridian 1 Fault clearing...
Page 62: Common Equipment Fault Indicators
Page 48 of 190 Clearing common equipment faults Table 9 Common equipment fault indicators Indicator Possible indications System messages BSD080, 085, 086, 103 CED messages INI001, 002, 004, 005 IOD006, 007, 060, 061, 291–297 NWS030, 102, 103, 142 SYS messages Visual indicators Major alarm on attendant consoles Red LED lit on column top cap...
Page 63: Call Processing Stopped (Options 21A And 21)
Continually observe and look up codes and system messages as you perform this procedure. For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — CPU card: QPC687 —...
Page 64 Page 50 of 190 Clearing common equipment faults Possible cause Action Defective FDI card Unseat the FDU and FDI card, then reinstall them. Make sure the cable or FDU between the FDU and FDI card is securely connected. If the system does not recover, continue with this procedure.
Page 65: Call Processing Stopped (Option 21E)
Continually observe and look up codes and system messages as you perform this procedure. For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — ICM card: NTND01 —...
Page 66 Page 52 of 190 Clearing common equipment faults Possible cause Action Defective module Make sure the green LED on the CE/PE power supply is lit. If it is not lit, power supply go to ““Clearing power faults” on page 19. If the power supply LED is lit, go to the next possible cause.
Page 67 — If necessary, replace the ROM card. If the system will not sysload, replace the MSPS card. If the system does not recover, go to the next possible cause. Defective Replace the card cage assembly in the module. backplane Meridian 1 Fault clearing...
Page 68: Fault Indicated On Memory/Peripheral Signaling Card (Options 21A And 21)
Note: Take any action indicated by the maintenance display codes. Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — CPU card: QPC687 —...
Page 69: Fault Indicated On Msps Card (Option 21E)
Note: Take any action indicated by the maintenance display codes. Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — ICM card: NTND01 —...
Page 70: Fault Indicated On The Cpu Card (Options 21A And 21)
Note: Continually observe and look up system messages as you perform this procedure. For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — CPU card: QPC687 —...
Page 71 — As necessary, replace the CPU card and the ROM card. If the CPU is still faulty, replace the memory/peripheral signaling card. If the CPU remains faulty, go to the next possible cause. Defective Replace the card cage assembly in the module. backplane Meridian 1 Fault clearing...
Page 72: Fault Indicated On The Icm Card (Option 21E)
Note: Continually observe and look up system messages as you perform this procedure. For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — ICM card: NTND01 —...
Page 73 — as necessary, replace the ICM card and the ROM card If the CPU is still faulty, replace the MSPS card. If the CPU remains faulty, go to the next possible cause. Defective Replace the card cage assembly in the module. backplane Meridian 1 Fault clearing...
Page 74: Call Processing Stopped (Option 51)
Note: Continually observe and look up codes and system messages as you perform this procedure. For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — BTU: QPC477 —...
Page 75 If the system does not recover, go to the next possible cause. Sysload required Press the reload (Rld) button on the CMA card. If a sysload (reload) occurs, clear any faults indicated. If the system will not sysload, go to the next possible cause. (continued) Meridian 1 Fault clearing...
Page 76 Page 62 of 190 Clearing common equipment faults Possible cause Action Defective CE card Unseat the CE cards then reinstall them. If the system does not recover, continue with this procedure. Try to sysload after any card is replaced. Make sure the cable between the IF and FN cards is securely connected. Make sure the CMA cable is securely connected.
Page 77: Fault Indicated On Memory Card (Option 51)
Note: Take any action indicated by the maintenance display codes. Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — CMA card: QPC581 or NTND10 —...
Page 78 Page 64 of 190 Clearing common equipment faults Possible cause Action Defective CE card Unseat the CE cards then reinstall them. If the system does not recover, continue with this procedure. Make sure the cable between the IF and FN cards is securely connected. Make sure the CMA cable is securely connected.
Page 79: Fault Indicated On A Common Equipment Card (Option 51)
For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — CMA card: QPC581 or NTND10 —...
Page 80 Page 66 of 190 Clearing common equipment faults Possible cause Action Defective SDI Check each SDI port by entering: LD 37 TTY x “x” represents the number of the interface device attached to the port. — If software is disabled, try to enable it (software disable, hardware disable, then reenable).
Page 81 — If the card will not enable, enter: MEM x — If the card fails the memory test, replace it. If the CPU is still faulty, go to the next possible cause. Defective Replace the card cage assembly in the module. backplane Meridian 1 Fault clearing...
Page 82: Call Processing Stopped (Options 61 And 71)
Note: Continually observe and look up codes and system messages as you perform this procedure. For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — BTU: QPC477 —...
Page 83 If the system does not recover, go to the next possible cause. Sysload required Simultaneously press reload (Rld) button on both CMA cards. If a sysload (reload) occurs, clear any faults indicated. If the system will not sysload, go to the next possible cause. (continued) Meridian 1 Fault clearing...
Page 84 Page 70 of 190 Clearing common equipment faults Possible cause Action Defective CE card Unseat the CE cards, then reinstall them: — Make sure all CE cables are securely connected, including the cable between the IF and FN cards. — Make sure the ROM card is properly installed on the FN card. If the system does not recover, continue with this procedure.
Page 85: Fault Indicated On A Memory Card (Options 61 And 71)
X11 system messages guide and follow the instructions given. If the fault does not clear, use this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: —...
Page 86 Page 72 of 190 Clearing common equipment faults Possible cause Action If the memory card passes the test, software disable it, then try to reenable by entering: ENL x If the card will not enable, replace it. If all memory cards are enabled but the CPU is still faulty, go to the next possible cause.
Page 87 If the CPU is still faulty, one at a time, replace the CE cables until a sysload occurs. If the CPU is still faulty, go to the next possible cause. Defective Replace the card cage assembly in the module. backplane Meridian 1 Fault clearing...
Page 88: Fault Indicated On A Common Equipment Card (Options 61 And 71)
For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — BTU: QPC477 —...
Page 89 — If software is disabled, try to enable it (software disable, hardware disable, then reenable). — If the card will not enable, replace it. If the CPU is still faulty, go to the next possible cause. (continued) Meridian 1 Fault clearing...
Page 90 Page 76 of 190 Clearing common equipment faults Possible cause Action Defective CE card Unseat the cards then reinstall them. Make sure all cables are securely (lit LED) connected. If all cards do not recover, continue with this procedure. If the LED is lit on the IF card: —...
Page 91: Fault Indicated On A Common Equipment Card (Options 51C, 61C, 81, And 81C)
For information on switch settings for the applicable Core cards, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — CP card —...
Page 92 Page 78 of 190 Clearing common equipment faults Possible cause Action Defective serial Check each SDI port by entering: I/O ports LD 37 STAT TTY — If software is disabled, try to enable it (software disable, hardware disable, then try to reenable). —...
Page 93 To be able to replace the card cage, you must first switch the system to use the alternate CPU and then disable and remove all the cards in the card cage you wish to replace. Meridian 1 Fault clearing...
Page 94: Floppy Disk Unit Not Operating
Continually observe and look up system messages as you perform this procedure. For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Cable between FDU and FDI card —...
Page 95 — If necessary, replace the data cartridge. If the FDU is still not operating, go to the next possible cause. Defective FDU or Replace the FDU. If it is still disabled, replace the cable between the FDU cable and FDI. Meridian 1 Fault clearing...
Page 96: Multi Drive Unit Or Small System Multi Drive Unit Not Operating
For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Cable between MDU and MSI or EMSI card —...
Page 97 Try to test the MSI/EMSI and MDU by entering: MSI or EMSI card LD 37 MSI x “x” represents the MSI/EMSI card number 0 or 1. If the MDU is still faulty, go to the next possible cause. (continued) Meridian 1 Fault clearing...
Page 98 Page 84 of 190 Clearing common equipment faults Possible cause Action Defective MSI or Check the MSI/EMSI card: EMSI card — Make sure the data cartridge is securely attached. — Check switch settings; if necessary, correct the switch settings. — Try to enable the MSI/EMSI card (try to software disable, hardware disable, then reenable).
Page 99: Core Multi Disk Unit Not Operating
Continually observe and look up system messages as you perform this procedure. For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — SCSI cable: NTND13 —...
Page 100 Page 86 of 190 Clearing common equipment faults Possible cause Action If you cannot load the program, replace the CMDU: — If you can load the program, test the port for the system terminal you were using. — If the port is okay, test the cable to the system terminal. —...
Page 101: Iop/Cmdu Not Operating
Continually observe and look up system messages as you perform this procedure. For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — IOP/CMDU:NT5D20 —...
Page 102 Page 88 of 190 Clearing common equipment faults Possible cause Action If you cannot load the program, replace the IOP/CMDU: — If you can load the program, test the port for the system terminal you were using. — If the port is okay, test the cable to the system terminal. —...
Page 103: Iodu/C Not Operating
For more information on IODU/C, please see the IODU/C Reference Guide. For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: —...
Page 104 Page 90 of 190 Clearing common equipment faults Possible cause Action If you cannot load the program, replace the IODU/C: — If you can load the program, test the port for the system terminal you were using. — If the port is okay, test the cable to the system terminal. —...
Page 105 Positively identify the NT SDID (8 digits engraved on the face of the the Security Security Device beneath the Nortel logo) with the NT SDID contained on Device and the keycode floppy disk label, and verify the NT SDIDs match.
Page 106 Page 92 of 190 Clearing common equipment faults 553-3001-510 Standard 11.00 June 1999...
Page 107: Clearing Network Equipment Faults
Music-on-Hold ......... Problems placing calls on 2500 telephones and some trunks ..Meridian 1 Fault clearing...
Page 108: Network Equipment Faults
Page 94 of 190 Clearing network equipment faults Network equipment faults Network equipment in the Meridian 1 provides speech path switching and transmits and receives signaling messages from the CPU. Network equipment can include: — conference/tone and digit switch (CONF/TDS) card: provides...
Page 109: Fault Clearing Procedures
Fault clearing procedures Manual continuity tests can be used to isolate superloop network card and IPE faults. For a description of manual continuity tests, see Meridian 1 general maintenance information (553-3001-500). See “LD 45” in the X11 input/output guide for details on performing the tests.
Page 110: Table 10
Page 96 of 190 Clearing network equipment faults Table 10 Network equipment fault indicators Indicator Possible indications System messages BSD081, 101, 110, 111, 121, 130, 201–203, 205–209, 600, 602 CNF messages DTA, DTC, DTI messages ERR020, 120, 4060 INI003, 007–012 NWS101, 141, 201–204, 301, 401 OVD021, 022, 023, 031 TDS messages...
Page 111: Disabled Loop Indicated By Ovd Message (Nt1P61 Fibre Superloop Network Card)
Note: Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Fibre Peripheral Controller card: NT1P62 —...
Page 112 Page 98 of 190 Clearing network equipment faults Possible cause Action If you receive an OVD message, replace the superloop network card. If the card is disabled, enable it by executing the ENLL loop command. If the response is UNEQ, install the card correctly and observe self-test. Defective Perform the Fibre Peripheral Controller card self-test: controller card...
Page 113: Disabled Loop Indicated By Ovd Message (Nt7R51 Local Carrier Interface Card)
Note: Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Remote Carrier Interface card: NT7R52 —...
Page 114 Page 100 of 190 Clearing network equipment faults Possible cause Action If you receive an OVD message, replace the superloop network card. If the card is disabled, enable it by executing the ENLL sl command. If the response is UNEQ, install the card correctly and observe self-test. Defective Remote Unseat all cards on the PE shelf except the Remote Carrier Interface Carrier Interface...
Page 115: Disabled Loop Indicated By Ovd Message (Nt8D04 Superloop Network Card)
Note: Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Controller card: NT8D01 — Superloop network card: NT8D04 —...
Page 116 Page 102 of 190 Clearing network equipment faults Possible cause Action If you receive an OVD message, replace the superloop network card. If there is no OVD message, go to the next possible cause. Defective Unseat all cards on the PE shelf except the controller card. Reconnect the controller card loop cable to the controller card and enable the card by entering: ENXP x...
Page 117: Loop Disabled Without Ovd Message (Nt8D04 Superloop Network Card)
Note: Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Controller card: NT8D01 — Superloop network card: NT8D04 —...
Page 118 Page 104 of 190 Clearing network equipment faults Possible cause Action If you receive an OVD message at this point, replace the superloop network card. If there is no OVD message and the loops will not enable, go to the next possible cause.
Page 119: Disabled Loop Indicated By Ovd Message (Qpc414 Network Card)
For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Dual loop peripheral buffer (DLB) card: QPC659 —...
Page 120 Page 106 of 190 Clearing network equipment faults Possible cause Action Defective DLB Unseat all cards on the PE shelf except the DLB card (if there are two card shelves on the loop, disconnect the cable to connector LPY): — Reconnect the loop cable to the DLB card. —...
Page 121 Check terminal equipment (such as attendant consoles and telephones) equipment on the disabled loop. If you find defective terminal equipment, see the appropriate chapter (such as “Clearing attendant console faults” on page 145) to fix the fault. Meridian 1 Fault clearing...
Page 122: Loop Disabled Without Ovd Message (Qpc414 Network Card)
For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Dual loop peripheral buffer (DLB) card: QPC659 —...
Page 123 If you receive an OVD message, remove the backplane access plate at the back of the EEPE shelf and replace the Dual Loop Peripheral Buffer Card. Reinsert the PE cards on the shelf. Replace the backplane access plate. (continued) Meridian 1 Fault clearing...
Page 124 Page 110 of 190 Clearing network equipment faults Possible cause Action Defective PE card Reinsert the PE cards one at a time. (If there are two shelves on the loop, follow this and subsequent procedures one at a time for each shelf.) If the LED lights when a card is inserted, software disable the card, then try to reenable it.
Page 125: Disabled Peripheral Signaling Card Indicated By Ovd Message
Note: Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Superloop network card or network card: NT8D04, QPC414 —...
Page 126 Page 112 of 190 Clearing network equipment faults Possible cause Action Defective network Reinsert network cards one at a time. card Wait for an OVD message after each card is inserted. If you receive an OVD message when one of the cards is inserted, replace that card.
Page 127: Peripheral Signaling Card Disabled Without Ovd Message
Note: Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Superloop network card or network card: NT8D04, QPC414 —...
Page 128 Page 114 of 190 Clearing network equipment faults Possible cause Action Defective network Reinsert network cards one at a time. card If you receive an OVD message when one of the cards is inserted or if the card is disabled, replace that card. Reenable the PS card by entering: LD 32 ENPS x...
Page 129: Problems With Transferring, Placing Conference Calls, Or Music-On-Hold
Note: Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Conference/TDS card: NT8D17 —...
Page 130 Northern Telecom Publications: — X11 input/output guide —LD31 tests — Telephone and attendant console installation (553-3001-215) — Meridian 1 telephones description and specifications (553-3001-108) Excessive traffic in Additional conference/TDS cards may be required to handle the traffic in the system the system.
Page 131: Problems Placing Calls On 2500 Telephones And Some Trunks
Note: Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Tone Detector Card: NT5K20, NT5K48 — Conference/TDS card: NT8D17 —...
Page 132 Page 118 of 190 Clearing network equipment faults Possible cause Action Defective Test Tone and Digit Switch loops by entering: conference/TDS LD 34 card TDS loop “loop” represents the loop number. If the conference loop is disabled, try to enable it by entering: ENLX loop “loop”...
Page 133: Clearing Peripheral Equipment Faults
Disabled peripheral equipment card ......More than one peripheral equipment card disabled ....Meridian 1 Fault clearing...
Page 134: Peripheral Equipment Faults
Fault clearing procedures Manual continuity tests can be used to isolate superloop network card and IPE faults. For a description of manual continuity tests, see Meridian 1 general maintenance information (553-3001-500). See “LD45” in the X11 system messages guide for details on performing the tests.
Page 135: Peripheral Equipment Fault Indicators
Trouble with calls on SL-1, M1000, or digital telephones WARNING Module covers are not hinged; do not let go of the cover. Lift the cover away from the module and set it out of your work area. Meridian 1 Fault clearing...
Page 136: Red Led Lit On Fibre Peripheral Controller Card
X11 input/output guide for details on performing loopback tests. Note: Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Fibre Peripheral Controller card: NT1P62 —...
Page 137 Test all cables to the controller card. If you find a defective cable, replace it. If there is no problem with the cables, go to the next possible cause. Defective Replace the card cage assembly in the module. backplane Meridian 1 Fault clearing...
Page 138: Red Led Lit On Remote Carrier Interface Card
X11 input/output guide for details on performing the tests. Note: Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Remote Carrier Interface card: NT7R52 —...
Page 139 Test all cables to the controller card. If you find a defective cable, replace it. If there is no problem with the cables, go to the next possible cause. Defective Replace the card cage assembly in the module. backplane Meridian 1 Fault clearing...
Page 140: Red Led Lit On Peripheral Controller Card
X11 input/output guide for details on performing the tests. Note: Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Controller card: NT8D01BC, NT8D01AC, NT8D01AD —...
Page 141 Test all cables to the controller card. If you find a defective cable, replace it. If there is no problem with the cables, go to the next possible cause. Defective Replace the card cage assembly in the module. backplane Meridian 1 Fault clearing...
Page 142: Red Led Lit On Dual Loop Peripheral Buffer Card
For information on switch settings, see Circuit card installation and testing (553-3001-211). Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Dual loop peripheral buffer (DLB) card: QPC659 or NT5K10 —...
Page 143 Test all cables to the DLB card. If you find a defective cable, replace it. If there is no problem with the cables, go to the next possible cause. Defective Replace the card cage assembly in the module. backplane Meridian 1 Fault clearing...
Page 144: Disabled Peripheral Equipment Card
X11 input/output guide for details on performing the tests. Note: Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Controller card: NT8D01BC, NT8D01AC, NT8D01AD —...
Page 145 Test the card by entering: LD 30 SHLF l s Defective network Replace the network card. card Test the loop by entering: LOOP loop “loop” represents the loop number. Defective Replace the card cage assembly in the module. backplane Meridian 1 Fault clearing...
Page 146: More Than One Peripheral Equipment Card Disabled
Note: Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Cable between network card and PE/IPE shelf —...
Page 147 Defective PE card Replace the affected card. Enable the card by entering: LD 32 ENLC l s c Test the card by entering: LD 30 SHLF l s Defective Replace the card cage assembly in the module. backplane Meridian 1 Fault clearing...
Page 148 Page 134 of 190 Clearing peripheral equipment faults 553-3001-510 Standard 11.00 June 1999...
Page 149: Clearing Trunk Faults
Trunk cannot make or receive calls (OVD message received) ..Trunk cannot make or receive calls (no OVD message)... . Meridian 1 Fault clearing...
Page 150: Trunk Faults
Page 136 of 190 Clearing trunk faults Trunk faults Trunk cards provide the interface between the peripheral equipment buffer and various trunk facilities. This chapter specifically considers two types of trunk cards: — E&M trunk card: provides four analog trunks, each of which can be individually configured to operate as: •...
Page 151 Loop Start • A-type signaling • Loop Start Disconnect Clearing • Loop Start Guarded Clearing Trunk faults can cause problems (such as noise) on outside calls and can keep calls from coming in or going out. Meridian 1 Fault clearing...
Page 152: Fault Clearing Procedures
Fault clearing procedures Manual continuity tests can be used to isolate superloop network card and IPE faults. For a description of manual continuity tests, see Meridian 1 general maintenance information (553-3001-500). See “LD45” in the X11 input/output guide for details on performing the tests.
Page 153: Trunk Cannot Make Or Receive Calls (Ovd Message Received)
Note: Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — E&M trunk card: NT8D15 NT5K19, NT5K72, NT5K83 —...
Page 154 Page 140 of 190 Clearing trunk faults Possible cause Action Defective trunk If the indicated card is an E&M or universal trunk card, unseat, then card reinstall, the card to initiate a self-test. If the test fails, replace the card. If the test passes, follow the procedure below.
Page 155 If you do not receive an OVD message, test superloop TNs by entering: LD 30 UNTT l s c u Test TNs on other loops by entering: LD 45 TEST If you receive an OVD message, replace the card cage assembly in the module. Meridian 1 Fault clearing...
Page 156: Trunk Cannot Make Or Receive Calls (No Ovd Message)
Note: Continually observe and look up system messages as you perform this procedure. Replace equipment as described in Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — E&M trunk card: NT8D15, NT5K19, NT5K72, NT5K83 —...
Page 157 If there is no problem with this equipment, go to the next possible cause. Excessive traffic in Additional trunk cards may be required to handle the traffic in the system. the system See Traffic measurement formats and output (553-2001-450). Meridian 1 Fault clearing...
Page 158 Page 144 of 190 Clearing trunk faults 553-3001-510 Standard 11.00 June 1999...
Page 159: Clearing Attendant Console Faults
Indicator or digit display not functioning properly ....Operator cannot hear or be heard properly ..... . Meridian 1 Fault clearing...
Page 160: Attendant Console Faults
Page 146 of 190 Clearing attendant console faults Attendant console faults Attendant consoles are the operator’s interface to the system and its features. Components that can cause an attendant console fault are: — the console itself or add-on units — the console power supply —...
Page 161: Fault Clearing Procedures
Trouble with equipment (such as handset, headset, or display) WARNING Module covers are not hinged; do not let go of the cover. Lift the cover away from the module and set it out of your work area. Meridian 1 Fault clearing...
Page 162: Console Cannot Make Or Receive Calls (Ovd Message Received)
Note: Continually observe and look up system messages as you perform this procedure. See Telephone and attendant console installation (553-3001-215) for information on connecting attendant consoles. See Meridian 1 system installation procedures (553-3001-210) for information on system cabling. To replace other equipment, see Meridian 1 hardware replacement (553-3001-520).
Page 163 If there is still a console problem, reconnect all wiring and go to the next possible cause. Defective Disable the TN. Unseat the affected PE card. backplane Reenable the TN and wait for an OVD message. If you receive an OVD message, replace the card cage assembly in the module. Meridian 1 Fault clearing...
Page 164: Console Cannot Make Or Receive Calls (No Ovd Message)
Note: Continually observe and look up system messages as you perform this procedure. See Telephone and attendant console installation (553-3001-215) for information on connecting attendant consoles. See Meridian 1 system installation procedures (553-3001-210) for information on system cabling. Possible cause...
Page 165 Make sure wiring is properly connected and wires are not interchanged, crossed, or grounded: — Check the wiring between the console and the cross-connect terminal. — Check the wiring between the PE/IPE shelf and the cross-connect terminal. If there is a wiring problem, correct it. Meridian 1 Fault clearing...
Page 166: Indicator Or Digit Display Not Functioning Properly
Page 152 of 190 Clearing attendant console faults Symptom: Indicator or digit display not functioning properly The attendant console operates, but some LCD indicators or digit displays are not functioning properly. Look up all system messages and maintenance display codes in the X11 system messages guide and follow the instructions given.
Page 167 If there is still a console problem, go to the next possible cause. Defective console Test the console by entering: LD 31 (See the X11 input/output guide for information on testing consoles with LD 31.) If the console fails the test, replace it. Meridian 1 Fault clearing...
Page 168: Operator Cannot Hear Or Be Heard Properly
Note: Continually observe and look up system messages as you perform this procedure. See Telephone and attendant console installation (553-3001-215) for information on connecting attendant consoles. See Meridian 1 system installation procedures (553-3001-210) for information on system cabling. To replace other equipment, see Meridian 1 hardware replacement (553-3001-520).
Page 169 Make sure wiring is properly connected and wires are not interchanged, console crossed, or grounded: — Check the wiring between the console and the cross-connect terminal. — Check the wiring between the PE shelf and the cross-connect terminal. If there is a wiring problem, correct it. Meridian 1 Fault clearing...
Page 170 Page 156 of 190 Clearing attendant console faults 553-3001-510 Standard 11.00 June 1999...
Page 171: Clearing Telephone Faults
Cannot dial from 2500 telephone ......No ring on 500 and 2500 telephones......Meridian 1 Fault clearing...
Page 172: Telephone Faults
Page 158 of 190 Clearing telephone faults Telephone faults Telephones and terminals are the user’s interface to the system and its features. Components that can cause a telephone fault are: — the telephone itself or add-on units — the telephone power supply —...
Page 173: Fault Clearing Procedures
Trouble with equipment (such as handset or add-on module) WARNING Module covers are not hinged; do not let go of the cover. Lift the cover away from the module and set it out of your work area. Meridian 1 Fault clearing...
Page 174: Telephone Cannot Make Or Receive Calls (Ovd Message Received)
Note: Continually observe and look up system messages as you perform this procedure. See Telephone and attendant console installation (553-3001-215) for information on connecting telephones. See Meridian 1 system installation procedures (553-3001-210) for information on system cabling. To replace other equipment, see Meridian 1 hardware replacement (553-3001-520).
Page 175 Defective Disable the TN. Unseat the affected PE card. backplane Reenable the TN and wait for an OVD message. If you receive an OVD message, replace the card cage assembly in the module. Meridian 1 Fault clearing...
Page 176: Telephone Cannot Make Or Receive Calls (No Ovd Message)
Note: Continually observe and look up system messages as you perform this procedure. See Telephone and attendant console installation (553-3001-215) for information on connecting telephones. See Meridian 1 system installation procedures (553-3001-210) for information on system cabling. To replace other equipment, see Meridian 1 hardware replacement (553-3001-520).
Page 177 Make sure wiring is properly connected and wires are not interchanged, crossed, or grounded: — Check the wiring between the telephone and the cross-connect terminal. — Check the wiring between the PE shelf and the cross-connect terminal. If there is a wiring problem, correct it. Meridian 1 Fault clearing...
Page 178: One End Cannot Hear Or Be Heard
Note: Continually observe and look up system messages as you perform this procedure. See Telephone and attendant console installation (553-3001-215) for information on connecting telephones. See Meridian 1 system installation procedures (553-3001-210) for information on system cabling. To replace other equipment, see Meridian 1 hardware replacement (553-3001-520).
Page 179 Make sure wiring is properly connected and wires are not interchanged, telephone crossed, or grounded: — Check the wiring between the telephone and the cross-connect terminal. — Check the wiring between the PE shelf and the cross-connect terminal. If there is a wiring problem, correct it. Meridian 1 Fault clearing...
Page 180: Noise Or Low Volume On All Calls
Note: Continually observe and look up system messages as you perform this procedure. See Telephone and attendant console installation (553-3001-215) for information on connecting telephones. See Meridian 1 system installation procedures (553-3001-210) for information on system cabling. To replace other equipment, see Meridian 1 hardware replacement (553-3001-520).
Page 181 Disconnect the wiring between the PE card and the cross-connect terminal. Reenable and test the TN by entering: ENLU l s c u Wait for an OVD message. If you receive a message indicating a problem with the card or unit, replace the card. Meridian 1 Fault clearing...
Page 182: Defective Indicator, Digit Display, Or Component
See Telephone and attendant console installation (553-3001-215) for information on connecting telephones. To replace other equipment, see Meridian 1 hardware replacement (553-3001-520). You may need to replace one of the following: — Power supply to telephone — PE or IPE card —...
Page 183 If there is an appropriate response, see “Add-on modules” in Telephone and attendant console installation (553-3001-215) for self-test instructions. Feature not Make sure the feature or the indicator is assigned in software (see the assigned X11 input/output guide ). Meridian 1 Fault clearing...
Page 184: Defective Feature
Page 170 of 190 Clearing telephone faults Symptom: Defective feature The telephone can make and receive calls, but one or more of its features (such as call transfer or ring again) is not working. Look up all system messages and maintenance display codes in the X11 system messages guide (553-3001-411) and follow the instructions given.
Page 185: Defective Add-On Module
If there is still a problem with the telephone, go to the next possible cause. Defective add-on Replace the add-on module. module Defective data If the fault is with a data add-on module, replace the data option card. option card Meridian 1 Fault clearing...
Page 186: Cannot Dial From 2500 Telephone
Note: Continually observe and look up system messages as you perform this procedure. See Telephone and attendant console installation (553-3001-215) for information on connecting telephones. See Meridian 1 system installation procedures (553-3001-210) for information on system cabling. To replace other equipment, see Meridian 1 hardware replacement (553-3001-520).
Page 187 If there is still a problem with the telephone, go to the next possible cause. Excessive Additional digitone receivers may be required to handle the traffic in the Digitone traffic system. See Traffic measurement formats and output (553-2001-450). Meridian 1 Fault clearing...
Page 188: No Ring On 500 And 2500 Telephones
Note: Continually observe and look up system messages as you perform this procedure. See Telephone and attendant console installation (553-3001-215) for information on connecting telephones. See Meridian 1 system installation procedures (553-3001-210) for information on system cabling. To replace other equipment, see Meridian 1 hardware replacement (553-3001-520).
Page 189 If there is still a problem with the telephone, reinstall the original ringing generator and go to the next possible cause. Defective If the green LED is lit on the ringing generator and the fault persists, backplane replace the card cage assembly in the module. Meridian 1 Fault clearing...
Page 190 Page 176 of 190 Clearing telephone faults 553-3001-510 Standard 11.00 June 1999...
Page 191: Final Maintenance Procedure
Final maintenance procedure Introduction Perform the final maintenance procedure (Procedure 4) to verify that the Meridian 1 is operating properly and that there are no remaining faults. Procedure 4 Final maintenance procedure Make sure all cards that may have been removed are reinserted in their assigned location and enabled.
Page 192 Page 178 of 190 Final maintenance procedure Clear fault indicators by entering: LD 35 or (LD 135 for options 51C, 61C, 81, and 81C) To clear the maintenance display in a single CPU system, enter: CDSP To clear the maintenance display in a dual CPU system, clear the display on one CPU by entering: CDSP Test the CPU by entering:...
Page 193 End the session in LD2 and log out of the system: **** LOGO Replace any covers you removed from modules. Tag defective equipment with a description of the fault and return it to a repair center. Meridian 1 Fault clearing...
Page 194 Page 180 of 190 Final maintenance procedure 553-3001-510 Standard 11.00 June 1999...
Page 195 Core Bus Terminator Common Equipment CE/PE Common/Peripheral Equipment CMA card Changeover and Memory Arbitrator Card CMDU card Core Multi Disk Unit Card Conference/TDS card NT8D17 Conference/Tone and Digit Switch Card Core to Network Interface Call Processor Meridian 1 Fault clearing...
Page 196 Page 182 of 190 List of terms Central Processing Unit DLB card QPC659 Dual Loop Peripheral Buffer Card DTR card Digitone Receiver Card Network/DTR card NT8D18 Network/Digitone Receiver Card FDI card QPC742 Floppy Disk Interface Card NT8D68 Floppy Disk Unit FN card QPC579 CPU Function Card IF card...
Page 197 List of terms Page 183 of 190 PS card QPC43 Peripheral Signaling Card ROM cards Read Only Memory Cards QPC215 Segmented Bus Extender Card SDI cards Serial Data Interface Cards Uninterruptible Power Supply Meridian 1 Fault clearing...
Page 198 Page 184 of 190 List of terms 553-3001-510 Standard 11.00 June 1999...
Page 199 35, 43 CMA (changeover and memory arbitrator) cards, 46 blower units, 20, 22, 23 CMDU (Core Multi Disk Unit), 46 BTU (bus terminating unit), 46 CMDU problems, 85 CNI (Core Network Interface) cards, 47 Meridian 1 Fault clearing...
Page 200 Page 186 of 190 Index common equipment faults continuity tests call processing stopped (system option 21E), for peripheral equipment fault clearance, 120 for trunk fault clearance, 138 call processing stopped (system option 51), 60 controller card problems, 124, 126 call processing stopped (system options 21A CP (call processor), 46 and 21), 49 CPU (central processing unit), 46...
Page 201 Page 187 of 190 History File, 9 memory/peripheral signaling card problems (system options 21A and 21), 54 Meridian 1 system related documentation, 1 messages. See fault indicators; maintenance display ICM card problems (system option 21E), 58 codes; system message IGS (intergroup switch) cards, 94...
Page 202 Page 188 of 190 Index NT8D19 Memory/Peripheral Signaling Card, 94 NTND02 Misc/SDI/Peripheral Signaling Card, 94 QPC414 Network Cards, 105, 108 passwords, 13 ring again problems, 170 PDU (power distribution unit), 20, 21 ringing generator, 20, 22, 23 peripheral equipment faults ROM (read only memory) cards, 46 controller card problems, 122, 124, 126 disabled cards, 130, 132...
Page 203 8, 121 for power faults, 8 for telephone faults, 8, 159 for trunk faults, 8, 138 volume or noise problems, 166 X11 release 19 and later for Multi User Login feature, 13 Meridian 1 Fault clearing...
Page 204 Page 190 of 190 Index 553-3001-510 Standard 11.00 June 1999...
Page 206 SL-1 and Meridian 1 are trademarks of Nortel Networks Corporation. Publication number: 553-3001-510 Document release: Standard 11.00...

Nortel Meridian 1 Manual

About this Document

How to Clear Faults

Accessing the System

Clearing Power Faults

Clearing Common Equipment Faults

Clearing Network Equipment Faults

Clearing Peripheral Equipment Faults

Clearing Trunk Faults

Clearing Attendant Console Faults

Clearing Telephone Faults

Final Maintenance Procedure

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Summary of Contents for Nortel Meridian 1

Table of Contents