Page 1: Communications System
AT&T 555-620-143 Issue 1 AT&T October 1992 MERLIN LEGEND Communications System Release 2.0 Maintenance and Troubleshooting...
Page 2: Interference Information
AT&T 555-620-143 Copyright © 1992 AT&T All Rights Reserved Issue 1 Printed in U.S.A. October 1992 Notice Every effort was made to ensure that the information in this book was complete and accurate at the time of printing. However, information is subject to change. Federal Communications Commission (FCC) Electromagnetic Interference Information This equipment has been tested and found to comply with the limits for a Class A digital...
Page 3: Table Of Contents
Contents About This Book Intended Audience Conventions Product Safety Labels Related Documents How to Comment on This Document Introduction to System Maintenance Equipment Maintenance Strategy 1-15 Unit Loads 1-25 Error Logs, the Access Log, and System Inventory Error Logs Access Log for Maintenance and System Programming 2-21 System Inventory 2-22...
Page 4 Contents Control Unit Problems Power Supply Problems Processor Problems 4-13 Module Problems 4-22 100D Module Problems 4-51 Carrier Problems 4-62 4-64 Checking System Status and Slot Status Central Office Problems Trunk Errors Checking Ports System Numbering Forms Form 2a, System Numbering—Station Jacks Form 2b, System Numbering—Digital Adjuncts Form 2c, System Numbering—Trunk Jacks Form 2d, System Numbering—Special Renumbers...
Page 5 Contents GL Glossary GL-1 Index Contents iii...
Page 6 Contents iv Contents...
Page 7: A System Numbering Forms
Figures Introduction to System Maintenance Figure 1-1. Removing the Control Unit Housing Figure 1-2. Installing the Control Unit Housing Figure 1-3. Setting up the MLX-20L Telephone Figure 1-4. Setting up the PC 1-10 Figure 1-5. Remote Modem Setup 1-11 Figure 1-6. Maintenance Strategy 1-20 Control Unit Problems...
Page 8 vi Contents...
Page 9 Tables Introduction to System Maintenance Table 1-1. Transient/Permanent Error Thresholds 1-22 Error Logs, the Access Log, and System Inventory Table 2-1. Error Codes Telephone Problems Table 3-1. Troubleshooting Telephone Problems Table 3-2. MLX Telephone Display Buttons 3-11 Control Unit Problems Table 4-1.
Page 10 viii Contents...
Page 11: Important Safety Instructions
CUSTOMER WARNING This manual is designed for use by qualified service technicians only. Technician qualification includes completion of an AT&T hands-on instructor-led course covering installation and maintenance for this product. Installation or maintenance of this product by anyone other than a qualified service technician may void the warranty.
Page 12 Use only AT&T-manufactured MERLIN LEGEND™ Communications System circuit modules, carrier assemblies, and power units in the MERLIN LEGEND Communications System (51 1A) control unit. Use only AT&T-recommended/approved MERLIN LEGEND Communications System accessories. If equipment connected to the analog station modules (008, 408, 408 GS/LS) or to the MLX telephone modules (008 MLX, 408 GS/LS- MLX) is to be used for in-range out-of-building (IROB) applications, IROB protectors are required.
Page 13: Customer Support Information
Customer Support Information Support Telephone Number In the U.S.A. only, AT&T provides a toll-free customer Helpline ( 1 -800-628-2888) 24 hours a day. Call the Helpline, or your authorized dealer, if you need assistance when installing, programming, or using your system. Outside the U.
Page 14 Customer Support Information FCC Notification and Repair Information This equipment is registered with the FCC in accordance with Part 68 of its rules. In compliance with those rules, you are advised of the following: Means of Connection. Connection of this equipment to the telephone network shall be through a standard network interface jack: USOC RJ11C, RJ14C, RJ21X.
Page 15 Customer Support Information ringing in response to an incoming call. In most, but not all, areas the sum of the RENs should not exceed five (5.0). To be certain of the number of devices that may be connected to the line, as determined by the total RENs, contact the telephone company to determine the maximum REN for the calling area.
Page 16 Customer Support Information This equipment returns answer supervision on all DID calls forwarded back to the Public Switched Telephone Network. Permissible exceptions are when: a call is unanswered a busy tone is received a reorder tone is received Allowing this equipment to be operated in such a manner as not to provide proper answer supervision signaling is in violation of Part 68 rules.
Page 17 Customer Support Information Renseignements sur la notification du ministère des Communications du Canada et la réparation AVIS: L’étiquette du ministère des Communications du Canada identifie Ie materiel homologué. Cette étiquette certifie que Ie materiel est conforme à certaines normes de protection, d’exploitation et de sécurité...
Page 18 Customer Support Information Customer Service Information...
Page 19 Customer Support Information Security of Your System—Preventing Toll Fraud As a customer of a new telephone system, you should be aware that there exists an increasing problem of telephone toll fraud. Telephone toll fraud can occur in many forms, despite the numerous efforts of telephone companies and telephone equipment manufacturers to control it.
Page 20 Customer Support Information To minimize the risk of unauthorized access to your communications system: Use a nonpublished Remote Access number. Assign authorization codes randomly to users on a need-to-have basis, keeping a log of ALL authorized users and assigning one code to one person. Use random sequence authorization codes, which are less likely to be easily broken.
Page 21 Customer Support Information failure to follow AT&T’s installation, operation, or maintenance instructions unauthorized system modification, movement, or alteration unauthorized use of common carrier communication services accessed through the system abuse, misuse, or negligent acts or omissions of the customer and persons under the customer’s control acts of third parties and acts of God AT&T’S OBLIGATION TO REPAIR, REPLACE, OR REFUND AS SET FORTH ABOVE IS...
Page 22 Customer Support Information Additionally, hackers may use a computer to dial an access code and then publish the information to other hackers. Substantial charges can accumulate quickly. It is your responsibility to take appropriate steps to implement the features properly, evaluate and administer the various restriction levels, protect and carefully distribute access codes.
Page 23 Customer Support Information improperly discarding them). Additionally, hackers may use a computer to dial an access code and then publish the information to other hackers. Substantial charges can accumulate quickly. It is your responsibility to take appropriate steps to implement the features properly, evaluate and administer the various restriction levels, and protect and carefully distribute access codes.
Page 24: About This Book
About This Book The Maintenance and Troubleshooting guide provides information and guidelines to assist you in resolving problems with the MERLIN LEGEND™ Release 2.0 Communications System. Intended Audience This book is intended for the qualified field technicians who respond to customer trouble reports.
Page 25: Conventions
About This Book Conventions The following typographical conventions are used in this book: Bold type is used for telephone buttons. Press Drop to delete the current entry. Italic type is used for emphasis and as a substitute for information for which you must supply a specific value.
Page 26: Product Safety Labels
About This Book Product Safety Labels Throughout these documents, hazardous situations are indicated by an exclamation point inside a triangle and the word “caution” or “warning.” WARNING: Warning indicates the presence of a hazard that could cause death or severe personal injury if the hazard is not avoided. CAUTION: Caution indicates the presence of a hazard that could cause minor personal injury or property damage if the hazard is not avoided.
Page 27 About This Book Document No. Title System Documents 555-620-114 System Overview 555-620-110 Feature Reference 555-620-115 Equipment and Operations Reference 555-620-116 Pocket Reference 555-620-111 System Programming 555-620-112 System Planning 555-620-113 System Planning Forms Telephone User Support 555-620-122 MLX-10D™, MLX-28D™, and MLX-20L™ Display Telephones User’s Guide 555-620-123 MLX-10D, MLX-28D, and MLX-20L...
Page 28: How To Comment On This Document
About This Book Document No. Title Documentation for Qualified Technicians 555-620-140 Installation, Programming, & Maintenance (lP&M) Binder (consists of 555-620-141,555-620-142, 555-620-143, and 555-620-144) 555-620-141 Installation 555-620-142 System Programming & Maintenance (SPM) 555-620-143 Maintenance and Troubleshooting 555-620-144 Programming Summary How to Comment on This Document We welcome your comments, both good and bad, Please use the feedback form on the next page to let us know how we can continue to serve you.
Page 29: Introduction To System Maintenance
Introduction to System Maintenance The purpose of maintenance is to detect, report, and clear problems quickly with minimum disruption of service. The system attempts to isolate each problem to a single replaceable unit whenever possible by running automatic tests. Errors that cannot be automatically corrected are usually recorded in error logs.
Page 30: Introduction To System Maintenance
Introduction to System Maintenance NOTE: The PC can be a DOS PC or a Master Controller (MCII+ or MCIII) A 355 AF adapter and D8W-87 cord is required to connect the PC to the control unit For remote maintenance, use a DOS PC with SPM. NOTE: On-site maintenance is preferred;...
Page 31 Introduction to System Maintenance regular pliers wrist grounding strap CAUTION: Electrostatic discharge can destroy or severely damage the integrated circuits in the power supply, processor, and modules. Should you ever need to open a module and handle the circuit board, use the wrist strap to connect your wrist to a suitable ground first.
Page 32: Figure 1-1. Removing The Control Unit Housing
Introduction to System Maintenance b. When the clips are freed from the housing, carefully pull the housing towards you. NOTE: If the system has more than one carrier, make sure you hold the housing only from the basic carrier side. Otherwise, the housing may disassemble.
Page 33 Introduction to System Maintenance Installing the Control Unit Housing When you have completed maintenance and troubleshooting, install the control unit housing as follows: If the housing is not already assembled, assemble it as follows: Lay the front panel(s) face down. If more than one carrier is being housed, connect the front panels together by lining up the arrows and then sliding the panels until the semicircles form a complete circle.
Page 34: Figure 1-2. Installing The Control Unit Housing
Introduction to System Maintenance Figure 1-2. Installing the Control Unit Housing 1-6 Equipment...
Page 35 Introduction to System Maintenance On-Site Maintenance You can do on-site maintenance with an MLX-20L console or a PC with SPM software. See the System Programming & Maintenance (SPM) guide for details. If you are in the UNIX® environment, see the documentation for Integrated Solution Ill (IS-III) as well.
Page 36: Figure 1-3. Setting Up The Mlx-20L Telephone
Introduction to System Maintenance Alternate MLX-20L Jacks (the first five) Default Default 008 MLX 408 GS/LS-MLX Line Jack Line Jack Underneath the MLX-20L Console Figure 1-3. Setting up the MLX-20L Telephone 1-8 Equipment...
Page 37 Introduction to System Maintenance MLX-20L Failure If the MLX-20L console does not work, troubleshoot it as follows: 1. Replace the MLX-20L console with one that is known to be working (if available). 2. If the failure persists, or if a working MLX-20L console is not available, connect the original MLX-20L console directly into the appropriate MLX jack on the control unit using a cord that is known to be working, 3.
Page 38: Figure 1-4. Setting Up The Pc
Introduction to System Maintenance Setting up the PC Plug your laptop or PC into the SPM jack on the processor as shown in Figure 1-4. Figure 1-4. Setting up the PC 1-10 Equipment...
Page 39: Figure 1-5. Remote Modem Setup
Introduction to System Maintenance Remote Maintenance Remote maintenance allows you to do everything as if you were on-site, including checking error logs, checking system status, and restarting the system. Figure 1-5. Remote Modem Setup 1-11 Equipment...
Page 40 Introduction to System Maintenance As shown in Figure 1-5, you need the following equipment to perform remote maintenance: 1. DOS PC with SPM 2. Tip/ring telephone 3. 1200-bps modem Connect the equipment as follows: 1. Connect the PC and modem using EIA-232-D cable. NOTE: If the modem is a circuit board in the PC, this connection is already established.
Page 41 Introduction to System Maintenance NOTE: Under applicable tariffs, the customer is responsible for any charges incurred through the remote use of system facilities. Precautions should be taken to prevent unauthorized use of the system’s outside lines by remote callers, also called toll fraud, See “Customer Support Information” at the beginning of this guide for more information on security.
Page 42 Introduction to System Maintenance 6. When the Password: prompt appears, type the password (do not press [ Enter ] The SPM Main menu appears. You are ready to proceed with remote maintenance. Dialing the Modem Directly To dial the modem directly, do the following: 1.
Page 43: Maintenance Strategy
Introduction to System Maintenance 5. When you hear the modem tone, hang up. 6. If nothing appears on the SPM screen, press [ Enter ]. 7. When the Password: prompt appears in the SPM window, type the password (do not press [ Enter ] NOTE: If you do not know the password, check the System...
Page 44 Introduction to System Maintenance Automatic Tests The system performs ongoing maintenance automatically by running tests that do the following: monitor the status of equipment audit operations consistency detect hardware malfunctions The tests check hardware and software that are in service without disrupting normal service.
Page 45 Introduction to System Maintenance System Restarts Depending on the severity and duration of a problem, you may need to restart the system. Some errors cause the system to restart automatically. Every restart causes an error log entry, and each type of restart has its own error code.
Page 46 Introduction to System Maintenance To perform a cold start, select Restart as follows: Menu SysProgram Exit System Restart NOTE: A cold start occurs automatically after a power interrupt of more than one second. A cold start does not blank out the screen on an MLX-20L telephone until the cold start is completed.
Page 47 Introduction to System Maintenance NOTE: System Erase is not displayed on the MLX-20L status display. To select System Erase, press the left button on Line 5 twice. After a System Erase or frigid start, the default printer is the PC printer, not the Station Message Detail Recording (SMDR) printer.
Page 48 Introduction to System Maintenance One or more alarms turn on: User or Attendant Alarm LED AT&T-authorized personnel reports a probIem Processor LED Discuss problem Phone Supplemental alert with the source problem Status display Troubleshoot telephone (Chapter 3) Maintenance or programming accessed just before Problem persists other...
Page 49 Introduction to System Maintenance Step 1a: Check Telephone Problems If the customer reported a telephone problem, do the following, which Chapter 3 describes in more detail: Discuss the problem with the user who reported the problem. Run the appropriate test to verify the complaint. Replace the telephone with one that is known to be working properly.
Page 50: Table 1-1. Transient/Permanent Error Thresholds
Introduction to System Maintenance NOTE: As you are checking the error logs, see Table 2-1, “Error Codes,” in Chapter 2 for detailed descriptions of each problem. Table 1-1. Transient/Permanent Error Thresholds Transient/Permanent Error Error Description Threshold Code 7402 LOOP BIT CONTROL NOT SET 7403 NO LOOP CURRENT 7404...
Page 51 Introduction to System Maintenance If you still cannot access the error logs after checking the processor, see “Carrier Problems” in Chapter 4. If you still cannot access the error logs, escalate the problem to your technical support organization. See “Escalating the Problem” in for details.
Page 52 Introduction to System Maintenance Step 5: Check the Modules If the error logs indicate any modules, see “Module Problems” in Chapter 4. Step 6: Check the Control Unit Carrier The last possible cause withln the control unit is the carrier. If the carrier is damaged, it must be replaced.
Page 53: Unit Loads
Introduction to System Maintenance Unit Loads A unit load is a measure of power (1,9 watts) used to determine the electrical load that the following components have on each carrier’s power supply: telephones and adjuncts Only the telephones and adjuncts that connect to the analog and digital ports on the control unit require unit load calculation.
Page 54 Introduction to System Maintenance Unit Loads for Key or Behind Switch Mode In a Key or Behind Switch system with four or fewer modules, no calculation is needed. The power supply (model 391A1) generally supports four modules of any type in Key or Behind Switch mode. Auxiliary Power Units The power supply provides 54 unit loads to each carrier.
Page 55: Error Logs, The Access Log, And System Inventory
Error Logs, the Access Log, and System Inventory As described under “Maintenance Strategy” in Chapter 1, much of your troubleshooting will rely on the error logs and the Access Log for maintenance and system programming. Both of these maintenance features are described here in detail.
Page 56: Quick Reference
Error Logs, the Access Log, and System Inventory Checking the Error Logs Print the errors immediately after exiting the error logs. This will help you determine if your work has resolved each problem. To print the errors, follow this procedure: More More (twice)
Page 57 Error Logs, the Access Log, and System Inventory Step Display Instructions Depending on your purpose, select Last System Error Log: 10, Permanent, or Transient. Make a selection Last 10 If you are not sure which selection to make, Permanent see ’’Step 2a: Check the Error Logs” in Transient (most recent alarm) Chapter 1 under “Maintenance Strategy."...
Page 58 Error Logs, the Access Log, and System Inventory Checking Permanent Errors (continued from “Procedure: Check the Error Logs” ) Display Step Instructions This screen appears when you select Permanent Errors: > Permanent. xxxxxxxxxxxxxxxxxxxxxxxx Slot xx Port xx Count xxx Line 2 provides a brief description of the First mm/dd/yy hh:mm error code identified on Line 6.
Page 59 Error Logs, the Access Log, and System Inventory Checking Transient Errors (continued from “Procedure: Check the Error Logs” ) Step Display Instructions This screen appears when you select Transient Errors: > Transient. xxxxxxxxxxxxxxxxxxxxxxxx Slot xx Port xx Count xxx Line 2 provides a brief description of the First mm/dd/yy hh:mm error code identified on Line 6.
Page 60 Error Logs, the Access Log, and System Inventory Checking the Last 10 Errors (continued from “Procedure: Check the Error Logs” ) Step Display Instructions This screen appears when you select Last Last 10 System Errors: > xxxxxxxxxxxxxxxxxxxxxxxx Slot xx Port xx Line 2 provides a brief description of the error code identified on Line 6.
Page 61: Table 2-1. Error Codes
Error Logs, the Access Log, and System Inventory Interpreting Error Codes Table 2-1 explains how to interpret each error from the error logs. For additional information on how to use the error logs, read this entire chapter and see “Maintenance Strategy” in Chapter 1. Table 2-1.
Page 62 Error Logs, the Access Log, and System inventory Table 2-1:- (Continued) Error Code Description Action Troubleshoot module or processor. 0007 SANITY TIMEOUT RESET: Faulty software, module, carrier, or processor sanity timer. Troubleshoot the power supply 0008 MAX RESET COUNT EXCEEDED: voltages.
Page 63 Error Logs, the Access Log, and System Inventory Table 2-1:- (Continued) Error Code Description Action If problem persists, troubleshoot the 000C SLOT STREAM CNT EXCEEDED: module. Slot has generated excessive interrupts. If problem persists, troubleshoot the 000D FMWR NOT IN STANDBY MODE: Module firmware is not in standby module.
Page 64 Error Logs, the Access Log, and System Inventory Table 2-1:- (Continued) Error Code Description Action Change system programming to reflect 0015 MODULE MISMATCH: the proper module, or install the proper Physical and logical type mismatch. module. Module insected into wrong slot. Troubleshoot the power supply 0016 POWER UP COLD START:...
Page 65 Error Logs, the Access Log, and System Inventory Table 2-1:- (Continued) Error Code Description Action If this error remains in the transient log, 4401 USER REQUESTED SYS ERASE: This error is logged after a System do the System Erase again. If problem Erase.
Page 66 Error Logs, the Access Log, and System Inventory Table 2-1:- (Continued) Error Action Code Description Troubleshoot the T1 trunk. If problem 6C05 DS1 LOSS OF MULTIFRAME: Service on the Iink has been lost. persists, escalate to your technical support organization. Troubleshoot the T1 trunk.
Page 67 Error Logs, the Access Log, and System inventory Table 2-1:- (Continued) Error Code Description Action Troubleshoot the T1 trunk. If problem 6COA DS1 SLIP ALARM: Slip count reached 88. persists, escalate to your technical support organization. Maintenance Slot Error Events Current hr If problem persists, escalate to your 6COB...
Page 68 Error Logs, the Access Log, and System Inventory Table 2-1:- (Continued) Error Code Description Action Troubleshoot the PRI trunk and report to 7004 PRI B-CHNL NOT RELEASED: service provider; otherwise, no action required. If problem persists, contact your technical support organization. Troubleshoot the PRI trunk and report to 7005 PRI B-CH GROUP INCONSIST:...
Page 69 Error Logs, the Access Log, and System Inventory Table 2-1:- (Continued) Error Code Action Description Test the trunk with a single-line 7403 NO LOOP CURRENT: Communication problems between the telephone. If the problem is not in the module and central office. trunk, replace the module with one that is know to be working.
Page 70 Error Logs, the Access Log, and System Inventory Table 2-1:- (Continued) Error Code Description Action No action required. Delete this entry 7803 NO PORT BOARDS AVAILABLE: This error is reported when modules are from the transient log. not present. Reset the board, if problem persists, 7804 INVALID SANITY RESPONSE: This error occurs when a sanity test...
Page 71 Error Logs, the Access Log, and System Inventory Table 2-1:- (Continued) Error Description Code Action If problem persists, troubleshoot the 780A DPR TEST NOT COMPLETED: Reported during cold start. module. 780C If this problem persists, replace the RAM TEST FAILURE: Memory failed the RAM test.
Page 72 Error Logs, the Access Log, and System Inventory Table 2-1: – (Continued) Error Action Code Description Troubleshoot the far end of the network 8403 NO EXTERNAL RELEASE: interface to see if it is working and Communication problems between the module and central office. Far end has translated properly.
Page 73 Error Logs, the Access Log, and System Inventory Table 2-1:- (Continued] Error Code Description Action Turn the processor off and then on. 8407 BAD UPDATE: Communication problems occurred Repeat system programming procedure. If problem persists, between the processor and the modules.
Page 74 Error Logs, the Access Log, and System Inventory Table 2-1: – (Continued) Error Code Description Action Replace the module with a similar 840C STUCK RINGING: Communication problems between the module and test. If the problem is resolved, replace the bad module. If module and central office.
Page 75: Access Log For Maintenance And System Programming
Error Logs, the Access Log, and System Inventory Access Log for Maintenance and System Programming In addition to checking the error logs, you can check the Access Log to aid you in your troubleshooting. Each time maintenance or system programming is accessed, the event is recorded in an Access Log (up to the last 20 events).
Page 76: System Inventory
Error Logs, the Access Log, and System Inventory Display Instructions Step The first screen of the Access Log SysProg/Maint AccessLog> appears. Date Time SP/M mm/dd/yy hh:mm xxxx xx Each event is documented by the time and mm/dd/yy hh:mm xxxx xx date of occurrence.
Page 77: Select System
Error Logs, the Access Log, and System Inventory Quick Reference Menu More (Only to see Maintenance System Inventory each next slot) Procedure: Check the System Inventory Step Display Instructions Select System. Maintenance > Make a selection System slot Port Exit Select Inventory.
Page 78 Error Logs, the Access Log, and System Inventory Step Display Instructions This screen appears for all slots except System Inventory: > slot 00. slot xx Board xxxxxxxx To continue displaying each additional Hardware Vintage: xx slot, continue pressing More. When you Firmware Vintage: xx reach the last slot, pressing More returns Exit...
Page 79: Telephone Problems
Telephone Problems Once a problem has been isolated to a telephone (or a group of telephones), you can run various tests to see if the telephone is working properly. The quickest approach is as follows: 1. Replace the telephone (or adjunct) with one that is known to be working properly.
Page 80: Telephone Troubleshooting
Telephone Problems CAUTION: A faulty circuit pack has the potential to damage the power supply, which can cause widespread damage throughout the system. 3. If the problem persists, replace the mounting cord. 4. If the problem persists, continue troubleshooting as described in this chapter.
Page 81: Fixing Telephone Problems
Telephone Problems Table 3-1. – Continued Symptom Section Telephone does not receive tones Voice Transmission Problems from the control unit Several single-line telephones Single-Line Telephone Problems cannot dial directly even though they are receiving calls Users cannot make outside calls on Single-Line Telephone Problems single-line touch-tone telephones Call Forward Problems...
Page 82 Telephone Problems Procedure connections in the telephone for loose or broken Check modular connectors. connections in the connecting blocks for loose or Check modular broken connectors. Check modular connections in the control unit for loose or broken connectors. Check transient errors in the error logs for any possible clues. Replace the suspect telephone with a known good telephone to determine if the problem is localized to the suspect telephone.
Page 83 Telephone Problems Analog Multiline Telephone Troubles Symptom Telephone LEDs and/or ringing tones do not work properly. Procedure Move the T/P switch on the left-hand side to the T (test) position. You should hear tone ringing. All the red and green LEDs on the terminal should flash alternately.
Page 84 Telephone Problems Symptom Time appears on the display, but the incoming call information does not. Procedure Move the T/P switch on the side of the telephone to the center position. Voice Transmission Troubles Symptom Telephone does not receive tones. Procedure Check the control unit and wiring with a telephone that is known to be working properly.
Page 85 Telephone Problems Procedure Using a single-line telephone, test the TTRs as follows: Pickup the handset, dial 04 , and the 2-digit number of the TTR to be tested. If you hear a busy tone, the receiver is in use. If you hear a reorder tone, you have misdialed or have reached an invalid TTR.
Page 86 Telephone Problems Call Forward Problems Symptom Users are getting other people’s calls. Procedure Usually this problem results when someone unknowingly activates Call Forward. Cancel the forwarding of calls to the receiving telephone as follows: For multiline telephones: 1. Select Feature. 2.
Page 87: Mlx Telephone Tests
Telephone Problems MLX Telephone Tests Symptoms LEDs, ringer, buttons, switchhook, or display do not appear to be working properly. NOTE: Telephones cannot be tested remotely. Procedure Pickup the handset. At the dial tone, dial 00 (the feature access code). The telephone should go into test mode. For some tests, this means that the LEDs turn on.
Page 88 Telephone Problems Press the fixed-feature buttons that have LEDs ( Feature, HFAl, Mute, and Speaker) to toggle the LED on and off. If the LED does not toggle on and off, the LED is in error. NOTE: Mute and Speaker LEDs may not toggle consistently since they are managed by both the control unit and the telephone.
Page 89: Table 3-2. Mlx Telephone Display Buttons
Telephone Problems 8. To test an MLX display, press each display button that you want to test. Each button displays in the upper-left corner as follows: Table 3-2. MLX Telephone Display Buttons Button Displays as Home HOME Menu MENU More MORE Inspct INSPECT...
Page 90 Telephone Problems 10. To test the Multi-Function Module, do the following: Connect a single-line telephone to the Multi-Function Module (MFM). Pick up the handset on the single-line telephone. When you hear the system access or intercom dial tone, dial 09 from the single-line telephone. The diagnostic test tone connects to the B-channel.
Page 91: Control Unit Problems
Control Unit Problems Once you resolve any problems with telephones, adjuncts, and any related wiring, you can move your troubleshooting to the control unit. Troubleshoot the control unit in the following order: 1. Power supply 2. Processor 3. Trunk/extension modules (referred to as modules throughout this guide) Carrier WARNING:...
Page 92: Power Supply Problems
Control Unit Problems Power Supply Problems Failure of the power supply shuts down everything connected to the carrier. Checking the Power Supply If you suspect the power supply of failure, check the following as described in this section: 1. LED on the power supply 2.
Page 93 Control Unit Problems Post Checking the Interlocking If the power supply is not working, check the interlocking post: 1. Turn off the power and remove the power supply as described in the next section, “Replacing the Power Supply.” WARNING: Never remove the power supply without first turning off the power switch and disconnecting the cord from the AC outlet.
Page 94: Figure 4-1. Power Supply Interlocking Post
Control Unit Problems Figure 4-1. Power Supply Interlocking Post Checking the Ring Generator Symptom Tip and ring devices, such as single-line sets, fax machines, and answering machines, do not ring. If this symptom occurs, replace the ring generator as described in the following procedure.
Page 95 Control Unit Problems Replacing the Ring Generator WARNING: Hazardous electrical voltages may be present if the following steps are not performed correctly. Follow these steps to replace a ring generator (see Figure 4-2 throughout this procedure): Make sure each power supply is turned off, including the module in the control unit and any auxiliary power units.
Page 96: Figure 4-2. Replacing A Ring Generator
Control Unit Problems Figure 4-2. Replacing a Ring Generator Power Supply Problems...
Page 97 Control Unit Problems Disconnect the other cable from the header labeled P101 on the right side of the power supply circuit board. NOTE: As shown in Figure 4-2, you need to grip this cable firmly and pull forcefully. Remove the four screws from the ring generator as shown in Figure 4-2.
Page 98 Control Unit Problems Connect the other end of the cable to the header labeled P1 on the ring generator. NOTE: The cable headers, P1. and P101, should be on the same side of the housing, so that the cables are not crossing each other. Connect one end of the new 4-pin cable to the header labeled P202 on the power supply circuit board.
Page 99 Control Unit Problems Checking the Auxiliary Power Unit(s) Symptom The LEDs on the multiline sets that are connected to the last two modules in the carrier do not light up. The last two slots in the carrier do not have power. The power supply LED is off.
Page 100: Figure 4-3. Replacing An Auxiliary Power Unit
Control Unit Problems Figure 4-3. Replacing an Auxiliary Power Unit Connect the cord into the jack labeled J2 DC OUTPUT on the replacement auxiliary power unit. Connect the other end into the jack labeled AUX POWER INPUT on the power supply. 4-10 Power Supply Problems...
Page 101 Control Unit Problems CAUTION: Do not plug the power supply or the auxiliary power unit into the AC outlet until you are ready to turn on the system, as described in “Powering Up the System” in Chapter 2 of the Installation guide. Do not attach the power cord(s) to any building surfaces.
Page 102 Control Unit Problems Power down the system by turning off the following components in the order given: a. the power supply on the basic carrier b. the power supply on each expansion carrier c. any auxiliary power unit (if present) Unplug the system from the AC outlet.
Page 103: Processor Problems
Control Unit Problems Processor Problems If the error logs (or any aspect of your troubleshooting) indicate the processor, do the following: If possible, back up the system programming using SPM. See the System Programming & Maintenance (SPM) guide for the backup procedure.
Page 104 Control Unit Problems Procedure: Peek Step Display Instructions Select Slot. Maintenance Make a selection System slot Port Exit Type 00 for the processor and then select Slot: Enter. Enter Slot number (O O-17) Backspace Exit Enter Select Demand Test. Slot 00: For all MLX modules, BchLoopback is also Make a selection Status...
Page 105 Control Unit Problems Step Display Instructions Poke and System Erase are not Demand Test Slot 00: displayed so that the customer does not Make a selection accidentally change the processor Peek [Poke] memory. [System Erase] Select Peek. Exit Enter the address that you want to examine Slot 00 EnterHexAddress: and then Select Enter.
Page 106 Control Unit Problems Poke CAUTION: Do not perform Poke unless you are following instructions from your technical support organization. Quick-Reference Procedure Menu Maintenance Slot Enter Demand Test Poke (Line 4, left button) twice Continue Procedure: Poke Step Display Instructions Select Slot. Maintenance Make a selection System...
Page 107 Control Unit Problems Step Display Instructions Select Demand Test. Slot 00: Make a selection For all MLX modules, BchLoopback is also Status displayed as an option on this screen. Demand Test For 100D modules, CSU-lpbk, Error Events, and Clock are also displayed as Exit options on this screen.
Page 108 Control Unit Problems Step Display Instructions Follow instructions from your technical Slot 00 EnterHexAddress: support organization. aaaaaaaa Enter If you enter information and then select Backspace Exit Enter, go to the next step. Follow instructions from your technical Oxaaaaaaaa Enter data: support organization.
Page 109 Control Unit Problems Quick-Reference Procedure Menu Maintenance Slot Enter Demand Test Erase (Line 5, left button) twice System System Erase (Frigid Start) Procedure: Step Display Instructions Select Slot. Maintenance Make a selection System slot Port Exit Type 00 for the processor and then se lect Slot: Enter.
Page 110 Control Unit Problems Step Display Instructions Poke and System Erase are not Demand Test Slot 00: displayed so that the customer does not Make a selection accidentally change the processor Peek memory. [Poke] [System Erase] To select System Erase, select the left Exit button on Line 5 twice.
Page 111 Control Unit Problems Unplug the SMDR printer and/or system programming PC cords. Remove the processor. Inspect the processor for any visible problems. Inspect the carrier. Unless you are installing a new feature module, remove the feature module from the old processor and install it in the replacement processor.
Page 112: Module Problems
Control Unit Problems Module Problems If you suspect that a module is faulty, do the following: 1. If you want to identify the cause of module errors, run the module tests described in this section. 2. To determine whether the module is faulty, replace it with a module of the same type.
Page 113: Figure 4-4. Module Test Process
Control Unit Problems Check the equipment: power supply maintenance terminal processor (use the PC when testing MLX modules) (back up the system programming) Check the error logs Resolve any processor problems Busy-out or reset the module errors Run the Internal Loopback test errors Run the Board Controller test Record the errors on...
Page 114 Control Unit Problems Before running any module test, make sure the following system components are working: Power supply Processor If possible, save the system programming on a floppy disk by using the backup procedure from the System Programming & Maintenance (SPM) guide. NOTE: If the power supply on the basic carrier has failed, the system cannot save the system programming to a disk.
Page 115 Control Unit Problems For each test, note the following: When beginning the board controller test or the internal Ioopback module test, you have the option of running it once or repetitively. You can interrupt any module test by selecting Exit. A module test fails for one of the following reasons: The module being tested was not busied-out.
Page 116 Control Unit Problems Persistent Module Problems If any of the module tests fail and replacing the module does not clear the trouble, one of the following could be the cause: Several modules could be faulty. The connector on the carrier could be faulty. Busy-Out and Reset Before running any module test, be sure to busy-out or reset the module.
Page 117 Control Unit Problems Preparation Appropriate Modules Any module that you are about to test Time Estimate Once all calls are terminated, the busy-out completes in less than 1 second. If calls in-progress take too long, ask the callers to hang up, or exit busy-out and do a reset instead.
Page 118 Control Unit Problems Step Display Instructions Select Busy-out. Slot xx: For all MLX modules, BchLoopback is also Make a selection Status Demand Test displayed as an option on this screen. Busy-Out Reset Restore For 100D modules, CSU–lpbk, Error Events, and Clock are also displayed as Exit options on this screen.
Page 119 Control Unit Problems Step Display Instructions This screen appears when the module is Busy-Out Slot xx successfully busied-out. Busy-Out Complete Exit This screen appears when the Busy-Out Busy-Out Slot xx: failed. Try again; be sure to specify the correct slot. Busy-Out FAILED Exit Preparation...
Page 120 Control Unit Problems Procedure: Reset the Module Display Instructions Step Select Slot. Maintenance Make a selection System Slot Port Exit Type the slot number and select Enter. Slot: Enter Slot number (OO-17) Backspace Exit Enter Select Reset. Slot xx: For all MLX modules, BchLoopback is also Make a selection Status Demand Test...
Page 121 Control Unit Problems Step Display Instructions This screen appears while the module is Reset Slot xx: discontinuing service to lines/trunks and extensions—all calls in progress are being Reset in Progress dropped. Exit This screen appears when the module is Slot Reset x x : successfully reset.
Page 122 Control Unit Problems Restore Once you complete module testing, restore it to terminate the busy-out or reset condition. Preparation Any module after testing it Appropriate Modules Time Estimate Less than 1 second Quick-Reference Procedure Menu Type the slot number Maintenance Slot Enter Restore...
Page 123 Control Unit Problems Step Display Instructions Select Restore. Slot xx: For all MLX modules, BchLoopback is also Make a selection Demand Test Status displayed as an option on this screen. Reset Busy-Out Restore For 100D modules, CSU-lpbk, Error Events, and Clock are also displayed as Exit options on this screen.
Page 124 Control Unit Problems Step Display Instructions This screen appears when the Restore Restore Slot xx: failed. Try again; be sure to specify the correct slot. Restore FAILED Exit Module Test #l: Internal Loopback Test This test checks communication between the processor and the module being tested.
Page 125 Control Unit Problems Busy-Out or Reset Busy-out or reset the module being tested prior to beginning the test. NOTE: Both Busy-out and Reset are in the Slot menu, which you can access by doing the following from the console: Menu Maintenance Slot See “Busy-Out and Reset”...
Page 126 Control Unit Problems Procedure: Run Internal Loopback Test Display Instructions Step Select Slot. Maintenance Make a selection System Slot Port Exit Type the slot number and select Enter. Slot : Enter Slot number (OO-17) Backspace Exit Enter Select Demand Test. Slot xx: For all MLX modules, BchLoopback is also Make a selection...
Page 127 Control Unit Problems Step Display Instructions Select Test Once to run the Internal Demand Test Slot xx: Loopback Test only once. Board aaaaaaaaaaaaaaaaaa Internal Loopback: Select Repetitive to run the Internal Test Once Loopback Test repeatedly. Repetitive Exit This screen appears while the test is Demand Test Slot xx: running.
Page 128: Table 4-1. Internal Loopback Test Errors
Control Unit Problems Instructions Display Step This screen appears when either test Demand Test Slot xx: > (Once or Repetitive) fails. Board aaaaaaaaaaaaaaaaaa Internal Loopback Test Lines 5 and 6 identify the cause of the FAILED failure or the number of errors found per xxxxxxxxxxxxxxxxxxxxxxx DSE port.
Page 129 Control Unit Problems Table 4-1. – Continued Error Message Corrective Action FMWR not in Standby Mode Exit the test and try again; if this error persists, record the errors on the repair tag and replace the module being tested. Test running too long Exit the test and try again;...
Page 130 Control Unit Problems Preparation Appropriate Modules This test can be run on all modules, except the processor. Time Estimate Less than 1 second Busy-Out or Reset Busy-out or reset the module being tested prior to beginning the test. NOTE: Both Busy-out and Reset are in the Slot menu, which you can access by doing the following from the console: Menu...
Page 131 Control Unit Problems Quick-Reference Procedure Menu Type the slot number Maintenance Slot Enter Test Once or Test Repetitive . Demand Test BoardCntrlr Procedure: Run Board Controller Module Test Step Display Instructions Select Slot. Maintenance Make a Selection System Slot Port Exit Type the slot number and select Enter.
Page 132 Control Unit Problems Step Display Instructions Select Test Once to run the Board Demand Test Slot xx: Controller Test only once. Board aaaaaaaaaaaaaaaaaa Board Controller: Select Repetitive to run the Board Test Once Controller Test repeatedly. Repetitive Exit This screen appears while the test is Demand Test Slot xx: running.
Page 133: Table 4-2. Board Controller Test Errors
Control Unit Problems Interpreting the Test Results If the test completes successfully, the module’s board controller is functioning properly. Continue with the next module test or restore the module if finished testing. If the test fails, find the error message in Table 4-2 and proceed as indicated. Table 4-2.
Page 134 Control Unit Problems Restoring the Module When you are finished running module tests, be sure to restore the module. See “Restore” earlier in this chapter. Module Test #3: B-Channel Loopback Test This test verifies that specific communication paths on the MLX module are operational.
Page 135 Control Unit Problems Restore Restore the module if it successfully completes all module tests and the errors no longer occur. NOTE: Restore is in the Slot menu, which you can access by doing the following from the console: Menu Maintenance Slot See the “Restore”...
Page 136 Control Unit Problems Display Instructions Step Select BchLoopback, which appears on Slot xx: the Slot screen only when you are testing Make a selection an MLX module. Status Demand Test Busy-out Reset Restore BchLoopback Exit This screen appears while the test is BchLoopback Slot xx: running.
Page 137: Table 43. B-Channel Loopback Errors
Control Unit Problems Interpreting the Test Results If the test completes successfully, the module’s B-channels are functioning properly. Continue with the next module test or restore the module if finished testing. If the test fails, find the error message in Table 4-3 and proceed as indicated.
Page 138 Control Unit Problems Restoring the Module When you are finished running module tests, be sure to restore the module. See “Restore” earlier in this chapter. Replacing Modules Modules can be removed and inserted (separately or at the same time) without affecting normal call processing. Leave the system power on. CAUTION: This section does not apply t the processor or power supply.
Page 139 Control Unit Problems Follow these steps to replace a module: Busy-out or reset the module. (Busy-out is recommended.) Label all cords (if they haven’t been labeled already) and then unplug them from the module. For information on labeling trunk and extension cords, see Chapters 3 and 4 in the lnstallation guide.
Page 140 Control Unit Problems Tools diagonal pliers or wire strippers Procedure Insert the 8-pin plug of the telephone cord into an outlet on the floor area. Using diagonal pliers or wire strippers, cut off the end of the telephone cord to expose the pairs. Choose a single pair and untwist the wires.
Page 141: 100D Module Problems
Control Unit Problems 100D Module Problems The 100D module requires the CSU Ioopback test in addition to the other module tests. See for a diagram of the entire module testing process. If you have any questions about the 100D module that this section does not cover, contact your technical support organization.
Page 142 Control Unit Problems NOTE: Both Busy-out and Reset are in the Slot menu, which you can access by doing the following from the console: Menu Maintenance Slot See “Busy-Out and Reset” earlier in this chapter for additional information. Interrupting the Test You can interrupt the test by selecting Exit.
Page 143 Control Unit Problems For the 551 TI CSU, do the following as well: Plug one end of a bantam-to-bantam patch cord (or a Ioopback fixture) into the EQ OUT jack on the front of the CSU. Plug the other end of the patch cord into the EQ IN jack on the CSU.
Page 144: Figure 4-6. Esf T1 Csu, Dte Loopback Switch
Control Unit Problems Figure 4-6. ESF T1 CSU, DTE Loopback Switch (on Front Panel) Procedure: Run CSU Loopback Test (Continued) Display Instructions Step Select Slot. Maintenance Make a Selection System Slot Port Exit Type the slot number for the 100D module Slot : and select Enter.
Page 145 Control Unit Problems Step Display Instructions Select Csu-lpbk, which appears on the Slot xx: Slot screen only when the 100D module’s Make a selection slot is selected. Status Demand Test Busy-Out Reset Error Events, and Clock are also Restore Error Events CSU-lpbk Clock displayed only for the 100D module.
Page 146: Table 4-4. Csu Loopback Test Errors
Control Unit Problems Step Display Instructions This screen appears when the test fails. CSU-lpbk Slot xx: CSU-lpbk Failed Lines 3 through 6 identify the cause of the xxxxxxxxxxxxxxxxxxxxxxx failure or the number of errors found per xxx xxx xxx xxx xxx xxx channel.
Page 147 Control Unit Problems Table 4-4. – Continued Error Message Corrective Action Exit the test and try again; if this error Test running too long persists, record the errors on the repair tag and replace the module being tested. Exit the test and try again; if this error Not in TEST/STANDBY persists, record the errors on the repair tag Mode...
Page 148 Control Unit Problems Automatic Tests for the 100D Every 15 minutes, the system checks the 100D module for the following: Initialization The system ensures that all T1 ports are properly initialized and placed into service. It also resolves the conflicts of different service levels (for example, between the individual ports or for the initialization of the ports to support features).
Page 149 Control Unit Problems Procedure: Check Error Events Step Display Instructions Select Slot. Maintenance Make a Selection System Slot Port Exit Type the slot number for the 100D module Slot: and select Enter. Enter Slot number (O O-17) Backspace Exit Enter Select Error Events, which appears on Slot xx: the slot screen on/y when the 100D...
Page 150 Control Unit Problems Step Display Instructions Select Current hr to display any errors Error Events Slot xx: that have accumulated during the current Make a selection hour. Current hr Previous hr The current hour always begins at ##:00 and ends at the Iast complete 15-minute Exit interval.
Page 151 Control Unit Problems 100D Clock Status If you have not been trained to perform T1 maintenance, contact your technical support organization for instructions on using this procedure. Quick-Reference Procedure Menu Type the slot number Maintenance Slot Enter Clock Procedure: Checking the Clock Status Step Display Instructions...
Page 152: Carrier Problems
Control Unit Problems Step Display Instructions Contact your technical support Clock Slot organization if you have not been trained mm/dd/yy hh:00-hh:mm how to interpret the information displayed Admin as: on this screen. Active: Synch source : PPM: xxx Exit Carrier Problems Checking the Carrier Typical carrier problems include power supply failure, sudden failure of one or more modules, or system problems that cannot be isolated to a specific...
Page 153 Control Unit Problems Power down the system by turning off the following components in the order given: a. power supply on the basic carrier b. power supply on each expansion carrier c. auxiliary power units (if present) Unplug the system from the AC outlet. Remove all modules from the faulty carrier, including the processor and power supply.
Page 154: Checking System Status And Slot Status
Control Unit Problems Checking System Status and Slot Status In addition to checking error logs, the access log, and running tests, you can check System Status and Slot status for information on each module. System Status The power supply, processor, 400 EM module, and 100D module are the only modules that have LEDs.
Page 155 Control Unit Problems Procedure: Check System Status Display Instructions Step Select System. Maintenance Make a selection System Slot Port Exit Select Status. System: Make a selection Status Error Log Inventory Access Log Enter Exit The System Status screen appears. > System Status: Slot00: Raaa Press More...
Page 156 Control Unit Problems Red LED When the red LED is on, the module is not in service because it is in standby mode, being tested, or in an alarm condition. When a module resumes normal operations, the red LED turns off. Yellow LED When the yellow LED is on, it usually means that at least one call is in progress on that module.
Page 157 Control Unit Problems Quick-Reference Procedure Menu Maintenance Slot Type the slot number Enter Status Procedure: Checking Slot Status Display Instructions Step Select Slot. Maintenance Make a selection System Slot Port Exit Type the slot number and select Enter Slot: Enter Slot number (00-17) Backspace Exit Enter...
Page 158 Control Unit Problems Display Instructions Step If you selected any slot other than 00, this Slot xx: screen appears. Make a selection Status Demand Test CSU-lpbk, Error Events, and Clock Reset Busy-Out appear only when the 100D module Error Events Restore occupies the selected slot.
Page 159: Central Office Problems
Central Office Problems If you have tested everything from the telephones to the modules in the control unit, you have isolated the trouble to the trunks or the central office. To isolate the trouble further, troubleshoot the trunks as indicated in this section.
Page 160: Table 5-1. Troubleshooting Trunk Symptoms
Central Office Problems Troubleshooting Trunk Problems Table 5-1 provides a quick-reference guide to trunk troubleshooting. Table 5-1. Troubleshooting Trunk Symptoms Symptom Section Incoming calls are not being received “Incoming Trunk Problems” Cannot make outgoing calls “Outgoing Trunk Problems” Trunk problems in general “Manual Correction of Trunk Problems”...
Page 161 Central Office Problems Outgoing Trunk Problems Symptom Outgoing trunks cannot be seized. NOTE: You cannot perform this procedure on a rotary telephone. Procedure At the network interface, check for a dial tone from the central office. If a dial tone is not present, notify the customer. NOTE: For GS trunks, apply ground to the ring lead to get a dial tone.
Page 162 Central Office Problems If the trunk is busy, you will hear a busy tone. You will hear a reorder tone if a wrong trunk type (such as DID) or an invalid trunk number was dialed. to malfunction, replace it. If the module continues Incoming Trunk Problems Symptom Incoming trunks do not work properly.
Page 163 Central Office Problems Automatic Testing for Trunks The automatic maintenance program takes the ports out of service when a trunk is malfunctioning. When a port is out of service, it is maintenance-busy. The trunk is periodically tested to put it back in service whenever possible. Maintenance-Busy Status When maintenance-busy is enabled and a trunk cannot be seized for an outgoing call, the trunk is automatically put into a maintenance-busy state.
Page 164 Central Office Problems Permanent Errors A permanent error is entered when more than 50 percent of the trunks in a pool are maintenance-busy. When the maintenance-busy level falls below 50 percent, the permanent error is automatically removed. NOTE: Make sure that no modules are in a maintenance-busy state during a backup procedure.
Page 165: Checking Ports
Central Office Problems Tie Trunk A seizure of an outgoing tie trunk fails. A transient error is reported. After four unsuccessful seizure attempts, the port is marked maintenance-busy and the error becomes permanent. The central office fails to disconnect. A transient error is reported. After two occurrences, the port is marked maintenance-busy and the error becomes permanent.
Page 166 Central Office Problems Chekcing Trunk Maintenance Status Follow the procedure in this section to see if a trunk is maintenance-busy. Quick-Reference Procedure Menu Type the dial plan Maintenance Port Line/Trunk number Enter Status Procedure: Check Trunk Maintenance-Busy Status Instructions S t e p Display Select Port.
Page 167 Central Office Problems Step Display Instructions Type the dial plan number for the trunk and Line/Trunk: select Enter. Enter line number xxxx Backspace Exit Enter Select Status. Line/Trunk XXXX Make a selection Status Restore Exit If the trunk you selected is maintenance- Line XXXX busy, this screen will show Yes in that...
Page 168 Central Office Problems Checking Station Maintenance-Busy Status Follow the procedure in this section to see if an extension is maintenance- busy. Quick-Reference Procedure Menu Type the dial plan number Maintenance Port Station Enter Status Procedure: Check Station Maintenance-Busy Status Step Display Instructions Select Port.
Page 169 Central Office Problems Step Display Instructions Type the dial plan number for the station Station: and select Enter. Enter station number xxxx Backspace Exit Enter Select Status. Station XXXX Make a selection Status Busy Out Restore Exit If the station that you selected is Station XXXX maintenance-busy, this screen will show...
Page 170 Central Office Problems Procedure: Busy-Out a Trunk Display Instructions Step Select Port. > Maintenance Make a Selection System slot Port Exit Select Line/Trunk. Port : Make a selection Line/Trunk Modem Station B-Channel Rs232 Portl RS232 Port2 Enter Exit Type the dial plan number for the trunk and Line/Trunk: select Enter.
Page 171 Central Office Problems Step Display Instructions This screen appears until the busy-out Line/Trunk XXXX finishes or fails. Busy-Out in Progress Exit This screen appears when busy-out BusyOut Line/Trunk XXXX successfully completes. Busy-Out Successfully Completed Exit This screen appears when busy-out fails. BusyOut Line/Trunk XXXX Exit and try again.
Page 172 Central Office Problems Procedure: Busy-Out a Station Display Instructions Step Select Port. > Maintenance Make a Selection System slot Port Exit Select Station. Port : Make a selection Line/Trunk Modem Station B-Channel RS232 Portl Rs232 Port2 Exit Enter Type the dial plan number for the station Station: and select Enter.
Page 173 Central Office Problems Step Display Instructions — This screen appears until the busy-out Station XXXX finishes or fails. Busy-Out in Progress Exit This screen appears when busy-out BusyOut Station XXXX successfully completes. Busy-Out Successfully Completed Exit This screen appears when busy-out fails. BusyOut Station XXXX Exit and try again.
Page 174 Central Office Problems Restoring a Trunk Follow the procedure in this section to restore a trunk. Quick-Reference Procedure Menu Type the dial plan Maintenance Port Line/Trunk number Enter Restore Procedure: Restore a Trunk Instructions Step Display Select Port. > Maintenance Make a Selection System slot...
Page 175 Central Office Problems Step Display Instructions Select Restore. Line/Trunk XXXX Make a selection Status Busy Out Restore Exit This screen appears until the restore Restore Line/Trunk XXXX finishes or fails. Restore in Progress Exit This screen appears when restore Restore Line/Trunk XXXX successfully completes.
Page 176 Central Office Problems Restoring a Station Follow the procedure in this section to restore an extension (a station). Quick-Reference Procedure Menu Typethe dial plan Maintenance Port Station Enter Restore Procedure: Restore a Station Step Display Instructions Select Port. > Maintenance Make a Selection System Slot...
Page 177 Central Office Problems Step Display Instructions Select Restore. Station XXXX Make a selection Status Busy Out Restore Exit This screen appears until the restore Restore Station XXXX finishes or fails. Restore in Progress Exit This screen appears when restore Restore Station XXXX successfully completes.
Page 178 Central Office Problems Resetting an RS-232 Port Follow the procedure in this section to reset an RS-232 port. NOTE: RS-232 Port 1 is the SPM port. RS-232 Port 2 is the SMDR port. Quick-Reference Procedure Menu RS232 Portl or RS232 Port2 Maintenance Port Reset...
Page 179 Central Office Problems Step Display Instructions Select Reset. Rs232 Portx: Make a selection Reset Exit Select Yes. Rs232 Portx Reset: Do you want to continue? Cancel Exit This screen appears until the reset finishes RS232 Portx Reset: or fails. Reset in Progress Exit This screen appears when reset RS232 Portx Reset:...
Page 180 Central Office Problems Step Display Instructions This screen appears when reset fails. Exit RS232 Portx Reset: and try again. Reset FAILED Exit Resetting the Processor’s Internal Modem Follow the procedure in this section to reset the processor’s internal modem. Quick-Reference Procedure Menu Maintenance Port...
Page 181 Central Office Problems Step Display Instructions Select Reset. Modem Port: Make a selection Reset Exit Select Yes. Modem Port Reset: Do you want to continue? Cancel Exit This screen appears until the reset finishes Modem Port Reset: or fails. Reset in Progress Exit This screen appears when reset Modem Port Reset:...
Page 182 Central Office Problems Display Instructions Step This screen appears when reset fails. Exit Modem Port Reset: and try again. Reset FAILED Exit Auditing DS1 PRI B-Channels General Procedure:. These procedures (Auditing Lines and Auditing Calls) initiate an audit. Once initiated, you need to wait for the far end to send a message, which usually takes about four minutes.
Page 183 Central Office Problems Preparation Appropriate Slot or Port This test can be run only on the slot and port of a DS1 PRI B-channel Time Estimate 4 minutes Backup Procedure Not required Busy-Out or Reset Not required Interrupting the Test You cannot interrupt this test.
Page 184 Central Office Problems Display Step Instructions Type the slot and port number for the B- B-Channel channel and select Enter. Enter B-Channel (sspp) xxxx Backspace Exit Select Audit Line. B-Channel XXXX Make a selection Audit Line Audit Call Exit This screen appears only if the audit Bchannel xxxx Audit Line message is successfully created and sent.
Page 185 Central Office Problems Step Display Instructions This screen appears when the message Bchannel xxxx Audit Line cannot be sent due to signaling failure. This indicates that the problem may be at Audit Failed the central office end. First, make sure the correct B-channel is selected.
Page 186 Central Office Problems Procedure: Auditing Calls Step Display Instructions Select Port. Maintenance > Make a Selection System slot Port Exit Select B-Channel. Port : Make a selection Line/Trunk Modem Station B-Channel Rs232 Portl RS232 Port2 Exit Enter Type the slot and port number for the B- B - C h a n n e l channel and select Enter.
Page 187 Central Office Problems Step Display Instructions This screen appears only if the audit Bchannel xxxx Audit Call message is successfully created and sent. Audit Initiated After about four minutes, check the error logs. If new PRI errors occur, contact your technical support organization for help on Exit interpreting the results and your action.
Page 188: System Numbering Forms
System Numbering Forms When you install a new system or when you change any existing trunk or extension wiring, record information about the wiring on the appropriate system numbering form. This appendix includes all of the system numbering forms and instructions for completing Form 2a, “System Numbering—Station Jacks.”...
Page 189: Form 2A, System Numbering-Station Jacks
System Numbering Forms Form 2a, System Numbering— Station Jacks Form 2a, System Numbering — Station Jacks Renumber System Set Up Space 2-Digit SeIected Extension Numbers q 3-Digit Figure A-1. Form 2a, System Numbering—Station Jacks Form 2a, System Numbering— Station Jacks...
Page 190 System Numbering Forms The following explains how to complete Form 2a. The number in the logical ID column refers to the number of the extension jack in the control unit. In the “Equipment” column, enter the type of device (such as an MLX- 20L console) that is connected to the extension jack.
Page 191: Form 2B, System Numbering-Digital Adjuncts
System Numbering Forms Form 2b, System Numbering— Digital Adjuncts Form 2b, System Numbering - Digital Adjuncts (Make additional copies of this form= needed.) Maximum: 127 Adjuncts Telephone Factory-Set Person, Location, Logical ID Extension No. Renumber to SAA T/R 75008 Ext No. Function, and Equipment Type Figure A-2.
Page 192: Form 2C, System Numbering-Trunk Jacks
System Numbering Forms Form 2c, System Numbering— Trunk Jacks Form 2c, System Numbering — Trunk Jacks Maintanance Alarm, Trunk No. S o u r c e Music-on-Hold, Trunk No. Loop-Start Reliable Disconnect* Loudspeaker Page, Trunk No(s). Figure A-3. Form 2c, System Numbering-Trunk Jacks Form 2c, System Numbering—...
Page 193: Form 2D, System Numbering-Special Renumbers
System Numbering Forms Form 2d, System Numbering— Special Renumbers Form 2d, System Numbering — Special Renumbers Figure A-4. Form 2d, System Numbering—Special Renumbers Form 2d, System Numbering—Special Renumbers...
Page 194: B Unit Load Calculation Worksheet
Unit Load Calculation Worksheet If you determine that you need to recalculate the unit load for any carrier, use the instructions on the following worksheet. NOTE: You should have a separate copy of the worksheet for each carrier. See “Unit Loads” in Chapter 1 for information on recalculating unit loads.
Page 195: Unit Load Worksheet
Unit Load Calculation Worksheet Unit Load Worksheet Number of modules in carrier (excluding power supply and processor): If fewer than 5, auxiliary power is not required. If 5 or 6, continue to Step 2. Key or Behind Switch mode only: Square Indicate configuration of lines;...
Page 196 Unit Load Calculation Worksheet 5. Calculate the estimated unit loads. Module Qty x Unit Load = Total 12.0 008 MLX 13.5 008 OPT 100D 400 EM 400 GS/LS/TTR 12.0 408 GS/LS 12.0 408 GS/LS-MLX 13.5 800 GS/LS 800 DID Total Estimated Unit Load If the total is less than or equal to 54, auxiliary power is not required.
Page 197 Unit Load Calculation Worksheet Calculate the actual carrier unit load. Qty x Unit Load = T o t a l Hybrid/PBX Equipment or Modified Square Network Access Lines* GS/LS T i e Telephones MLX-10 MLX-1OD MLX-28D MLX-20L BIS-10 BIS-22 BIS-22D BIS-34 BIS-34D MLC-5...
Page 198 Unit Load Calculation Worksheet Qty x Unit Load = Total Hybrid/PBx Equipment or Modified Square Optional Equipment † Direct Station Selector ‡ General Purpose Adapter Hands-Free Unit Headset Adapter Total Actual Unit Load The MFM has its own wall power unit located at the telephone and therefore is †...
Page 199 Unit Load Calculation Worksheet 7. Try to exchange modules between carriers to reduce the unit loads to 54. (Remember that the 10OD, 400, 400 GS/LS/TTR, 800, and 800 GS/LS modules have unit loads of 0.0.) Repeat Steps 1 through 6 to recalculate unit loads for the new configuration.
Page 200 Unit Load Calculation Worksheet 8. Calculate the unit load for slots 5 and 6 of the carrier. Qty x Unit Load = Total Hybrid/PBX Equipment or Modified Square Network Access Lines* GS/LS Telephones MLX-10 MLX-1OD MLX-28D MLX-20L BIS-10 BIS-22 BIS-22D BIS-34 BIS-34D MLC-5...
Page 201 Unit Load Calculation Worksheet Qty x Unit Load = Total Hybrid/PBX or Modified Square Equipment Optional Equipment † Direct Station Selector ‡ General Purpose Adapter Hands-Free Unit Headset Adapter Total Unit Load for Slots 5 and 6 The MFM has its own individual wall power unit located at the telephone and †...
Page 202 Unit Load Calculation Worksheet Try to exchange modules between carriers to reduce the unit loads for slots 5 and 6 through 27. (Remember that the 100D, 400, 400 GS/LS/TTR, 800, and 800 GS/LS modules have unit loads of 0.0. ) Repeat Steps 1 through 8 to recalculate unit loads for new configuration.
Page 203 Glossary adjunct Optional equipment used with the communications system such as an alerting device that connects to a multiline telephone or to a telephone jack. alternate mark inversion (AMI) A line coding format in which a binary 1 is represented by a positive or negative pulse, a binary 0 is represented by no line signal, and subsequent binary 1‘s must alternate in polarity or there will be a bipolar violation.
Page 204 Glossary automatic-start tie trunk A tie trunk on which incoming calls are routed to an operator or other designated destination without a start signal. Also called automatic-ringdown tie trunk or auto-in tie trunk. auxiliary power unit A device that provides additional power to the communications system. B channel A 64 kbps channel that carries a variety of digital information streams, such as voice at 64 kbps, data at up to 64kpbs, wideband voice encoded at 64 kpbs,...
Page 205 Glossary A multiconductor electrical path used to transfer information over a common connection from any of several sources to any of several destinations. campus cable Cable that runs between buildings connected to the same communications system. CCITT Committee Consultant Internatioale Telephonique et Telegraphique common-channel signaling Centrex A set of communications system features a user can subscribe to on...
Page 206 Glossary D4 framing format A framing format consisting of a sequence of individual frames of 24 eight-bit slots and 1 signal bit (193 bits) in a 12 frame superframe. See also extended superframe format. data communications equipment (DCE) Equipment such as modems or data modules used to establish, maintain, and terminate a connection between the communications system and data terminal equipment (DTE), such as printers, host computers, or workstations.
Page 207 Glossary digital switch element (DSE) A device in each jack on each module in the communications system control unit that interfaces with the TDM (time-division multiplex) bus. direct facility termination (DFT) A central office (CO) trunk that terminates directly on one or more telephones; in PBX mode a OFT cannot be part of a trunk pool.
Page 208 Glossary data terminal equipment dual-tone multifrequency (DTMF) signaling touch-tone signaling from telephones using the voice transmission path. The code for DTMF signaling provides 12 distinct signals, each composed of two voice-band frequencies. E&M ear and mouth (receive & transmit) E and M signaling Tie-trunk supervisory signaling, used between two communications systems, in which information is transferred through two-state voltage conditions (on the E and M leads) for analog applications and through two bits for digital...
Page 209 Glossary frequency generator A circuit pack added to the power unit module that generates a high-voltage, 20-30 Hz signal to ring a telephone. Also called a ring generator. FX (foreign exchange) A central office (CO) other than the one providing local access to the public network.
Page 210 Glossary IROB (in-range out-of-building) protector A surge protection device for off-premises telephones at a location within 1000 ft (305 m) of cable distance from the communications system control unit. Key mode A mode of operation in which the communications system uses direct facility terminations (DFTs) on line buttons with a separate path for internal calling.
Page 211 Glossary Mbps megabits per second Megacom® Digital WATS (wide area telecommunications service) offering for outward calling. Megacom 800 Digital 800 service for inward calling. Multi-Function Module MLX-10 /MLX-10D telephone or console A 10-button telephone offered with or without a 2-line by 24-character, menu- driven display.
Page 212 Glossary Music-on-Hold (MOH) Magic on Hold or a customer-provided music source connected to the communications system via a loop-start (LS) jack. Most MOH equipment is designed for LS operation. Note: If you use equipment that rebroadcasts music or other copyrighted materials, you may be required to obtain a copyright license from and pay fees to a third party such as the American Society of Composers, Artists, and Producers (ASCAP) or Broadcast Music Incorporated (BMI).
Page 213 Glossary pool On a Hybrid/PBX system, a grouping of outside trunks that users can choose with multiple pool buttons or by dialing access codes on an SA (System Access) button on the telephone, Pools are also used by the Automatic Route Selection (ARS) feature to choose the cheapest method to route a call.
Page 214 Glossary simplex signaling The transmission of signals in one direction only across a telecommunications channel. single-line telephone An industry-standard, touch-tone or rotary telephone that only handles one trunk and is connected to the communications system via a jack on a basic telephone module.
Page 215 Glossary synchronous data transmission A method for continuous digital data stream in which the transmission of each binary bit is synchronized with a master clock. System Programming & Maintenance (SPM) A DOS-or UNIX-based application for programming and maintaining the communications system. system renumbering A process used to change the extension numbers assigned to telephones, adjuncts, calling groups, paging groups, Call Park zones, and Remote...
Page 216 Glossary uninterruptible power supply volt-ampere Volts AC voice-band channel A transmission channel, generally the 300-3400 -Hz frequency band. voice-only A telephone that is set up for making and receiving voice calls but not data calls. voice signal pair A pair of leads on an analog multiline telephone used for the Voice Announce to Busy feature.
Page 217 Index Cold start 1-17 CSU Ioopback test 4-51 Adjunct problems 3-1 Alarms 1-15 — 1-16 Auditing DS1 PRI B-Channels 5-24 DS1 PRI calls 5-24 B-Channels, auditing 5-24 Automatic tests 1-16 calls, auditing 5-24 Backup warning, maintenance- Equipment 1-1 busy 5-6 Error events, 100D module 4-58 BchLoopback test 4-45 Error Logs 2-1...
Page 218 Index Key mode 1-26 100D module 4-51 clock 4-61 error events 4-58 On-site maintenance 1-7 Laptop 1-10 PC 1-10 laptop 1-10 Peek 4-13 Maintenance 1-1 Permanent error 1-16 on-site 1-7 Poke 4-16 remote 1-11 Ports, checking 5-7 Maintenance-Busy 5-5 Power supply causes 5-6 interlocking post programming 5-7...
Page 219 Index Restore CSU Ioopback 4-51 RS-232 port 5-20 internal Ioopback 4-34 station 5-18 Tools 1-2 trunks 5-16 Troubleshooting 2-7 Ring generator 4-5 Trunk RS232 port, resetting 5-20 busy-out 5-11 restore 5-16 Trunk problems, manual correction 5-2 Trunks checking maintenance-busy Slot Status 4-66 status 5-8 SPM 1-11 incoming problems 5-4...

AT&T MERLIN LEGEND Communications System Release 2.0 Maintenance And Troubleshooting Manual

1 Introduction to System Maintenance

2 Error Logs, the Access Log, and System Inventory

3 Telephone Problems

4 Control Unit Problems

5 Central Office Problems

B Unit Load Calculation Worksheet

Quick Links

Communications System

Troubleshooting

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Summary of Contents for AT&T MERLIN LEGEND Communications System Release 2.0

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