Tables | AT&T 3.0 specification

Tables

5 Central Office Problems

5-1. Troubleshooting Trunk Symptoms

5-2

x Maintenance and Troubleshooting

Image 307

AT&T 3.0 manual Tables

Contents

AT&T Trademarks WarrantyCopyright 1994, AT&T All Rights Reserved August Security of Your System Preventing Toll Fraud Contents Connecting the Control Unit to the Network Interface Installing the PC, CAT, or Printer Installing Applications Unit Load Calculation Worksheet Figures MFM Connecting the Control Unit to the Network Interface Installing the PC, CAT, or Printer Ground-Start Button Tables Merlin Mail Ports Required Important Safety Instructions Page Safety Safety Xviii Installation Intended Audience How to Use This Book Xx Installation Lines, Trunks and Facilities Terms and Conventions Used Example Purpose Product Safety Labels Security System Documents Related Documents AT&T How to Comment on This Document How to Comment on This Document Xxvi Installation Order No -630-140 Date August Merlin Legend Communications System Release Introduction Installation Sequence System Forms Installing Telephones Required Adjuncts Optional Installling the Control UnitConnecting the Network Interface Programming the System Connecting Data EquipmentUpgrading the System Overview Installing the Control Unit Environment Control Unit Requirements Electrical Noise/Radio-Frequency Interference Backboard Requirements Hardware Preassemble Process Installing the Backboard AC Power and GroundingPage AC Grounding Requirements Using an Ideal 61-035 Circuit Tester or Equivalent AC Power Requirements Parameter Value Measuring the AC Outlet Voltages Unplug the circuit tester Grounding Requirements Central Office and AC Grounds Approved Grounds Central Office Trunk Protection Heavy Lightning Protection Installing 146A and 147A Protectors Unit Loads Unit Loads for Hybrid/PBX ModeChecking Unit Loads Unit Loads for Key or Behind Switch Mode Installing the Basic CarrierAuxiliary Power Units Marking the Basic Carrier Screw Holes Installing the Power Supply Installing a Copper Shield Turning Off the Power Installing the Power Supply Installing a Copper Shield in the Power Supply Installing the Ferrite Cores Installing the Power Supply Module Carrier Installing the Ferrite Cores Installing the Auxiliary Power Unit Installing an Auxiliary Power Unit Installing Expansion Carriers Connecting the Carriers Installing the Processor Push firmly until the processor snaps into place Installing the Processor in the Carrier 10. Installing the Processor into the Carrier Guidelines Installing the Modules Installing Modules Tie Trunks Tie Trunk SignalingSignaling Modes Signaling Types Simplex Mode 400EM Tie Trunk Module DIP SwitchesMode Merlin Signaling Formats for the 400EM Tie Trunk Module 11 EM Module Sample Dip Switch Settings for Signaling Types Labeling 12. Line/Trunk and Telephone Jack Locations on Each Module Replacing a Module Installing the Control Unit 13. Removing Modules from the Carrier Connecting the Control Unit to An AC Outlet Turn on the power switch on the basic carrier power supply Powering Up the System Unplug the system from the AC outlet Powering Down the System Powering Down the System 46Installing the Control Unit Installing Multi-Function Modules Installing Telephones Adjuncts Considerations Risk of Electrical Shock Follow all warnings and cautions Removing the User Card Tray and Line Cable Releasing the Deskstand Removing the Deskstand Release and remove the module cover. See -5, -6,and Figure Releasing the Module Cover Screw Releasing the Module Cover Removing the Module Cover Removing an MFM Module Install the new MFM. See Figure Installing an MFM Module Multi-Function Module To remove the jack guard, see Figure 11. Removing the Jack Guard To replace the module cover, see -12, -13,and Figure 12. Placing the Module Cover into the Locating Slot 13. Lowering and Locking the Module Cover 14. Replacing and Tightening the Module Cover Screw 15. Replacing the Deskstand 16. Lowering the DeskStand and Locking into Place Replace the user card tray and line cable. See Figure 17. Replacing the User Card Tray and Line Cable Power up the telephone. See Figure Adjust the deskstand height. See Figure 19. Powering Up the Telephone after Installing the MFM Test the MFM for T/R operation Attach the adjunct to the MFM. See Installing Adjuncts To connect an adjunct to a single-line telephone 20. Routing the Cords Through the Cord Channel To connect an adjunct to an analog multiline telephone General Purpose Adapter Dial Dictation Devices Fax Machines Group Calling Delay Announcement DevicesCredit Card Verification Terminals Headpieces Headsets One-Touch Operation All Telephones Manual Operation Analog Multiline Telephones Only 21. Manual and One-Touch Headset Operation Loudspeaker Paging Systems Dual-Tone Multifrequency Dtmf Signaling 22. Single-Zone Paging with PagePac Plus 23. Single-Zone Paging with Customer-Supplied Amplifier 24. Single-Zone Paging with Upam Modems Merlin Identifier Music On Hold and Magic on Hold 36Installing Telephones and Adjuncts Music Port Supplemental Alert Adapter Supplemental Alerts Unsupported Telephones, Adjuncts Adapters 27. Installing the Supplemental Alert Adapter Unsupported Telephones and Adjuncts Model Single-Line Telephones Single-Line Telephones Description Single-Line Telephones in Release 3.0 and Later Installing Direct Station Selectors Install the D8AC cord on the DSS Adjust the angle of the DSSWire the two DSSs. See Figure Wire the telephone to the DSS units. See Figure 28. Connecting One or More DSSs 29. Wiring for Auxiliary Power Label the DSS designation cards Considerations Assembling MLX Telephones Remove or adjust the deskstand. See Figure 30. Adjusting or Removing the Deskstand Connect the line cords. See Figure 31. Connecting the Line Cords Label the extension identification card Connect the handset 33. Labeling the Extension Prepare the handset holder for wall-mounting 34. Removing the Handset Holder Wall mounting an MLX-10, MIX-10DP, or MlX-10D telephone Replace the extension label and plastic cover 37. Mounting the Backplate Label the button assignment card 38. Routing the Cord Through the Backplate MDC 9000 Cordless Telephone Installing Cordless or Cordless/Wireless TelephonesMDW 9000 Cordless/Wireless Telephones Adjust the contrast on the telephone% display Connecting Telephones To the Control Unit Installing Telephones and Adjuncts Wiring a Telephone for Two Voice Pairs Even D8W Remove the wires or the patch cord from the connecting block Removing Damaged Connecting Blocks 40. Removing the Connecting Block Page Connecting the Control Unit to Network Interface Network Interfaces Description Adapter Wiring Did RJ21X Interface RJ21X Network Interface Connector RJ21X Wiring Field Hardware Building the Wiring Field RJ21X Wiring Field Tools Using the D-Impact Tool to Seat the Conductors See Labeling Trunks, later in this chapter, for instructions RJ11 and RJ14 Interfaces RJ11 and RJ14 Interfaces RJ2GX Interface Testing Loop-Start Trunks Testing TrunksRJ48C/X Interface Testing Ground-Start Trunks Labeling Trunks Installing the Channel Service Unit Acculink CSUs Page 3150 Front Panel Page Connecting a PC to the Control Unit Installing the PC, CAT, or Printer Connect the D8W cord Connecting a PC Within 50 Feet Connecting a PC Within 50 ft .2 m Connecting a PC More Than Feet 15.2 m Away Page Connecting a PC More Than 50 ft .2 m Away Connecting a Printer To the Control Unit Connecting a CAT To the Control Unit 8Installing the PC, CAT, or Printer Connecting a CAT and Printer On the Same AC Outlet Connecting a CAT and Printer on the Same AC Outlet Connecting a CAT and Printer on a Different AC OutletPage Page Merlin Smdr Page Connecting a Printer Within 50 Feet 15.2 m Connecting a Printer Within 50 ft .2 m Connecting a Printer 50 Feet Or More Away 18Installing the PC, CAT, or Printer Connecting a Printer More Than 50 ft .2 m Away Connecting the 24813 Adapter and the 201213 Transformer Setting Printer Options and DIP Switches On next AT&T 572 Printer Options Function Menu Status BPS Function Menu Status Switch AT&T 475/476 Printer DIP Switch Settings DIP 2-CM AT&T CAT Printer DIP Switch Settings Control SwitchPage Data Stations Connecting Data Equipment Telephone GPA or Data Station ConfigurationsStation For voice Modem Data Stations 7500B Data Stations Setting Up GPA SettingsAnalog Voice and Modem Data Stations Connect the GPA to the analog multiIine telephone Connect the modem to the GPA Analog Voice and Modem Data Equipment Configuration Connect the modem to the control unit Modem Data-Only Stations Modem Data-Only Equipment Configuration MLX Voice and Modem Data Stations Modem Data and MLX Voice Equipment Configuration Connect the MLX telephone to the control unit Connect the modem to the MFM in the MLX telephone MLX Voice and 7500B Data Stations Connect the 7500B data module to the control unit MLX Voice and 7500B Data Equipment Configuration 7500B Data-Only Stations B Data-Only Equipment Configuration Acculink 3150 CSU Video Conferencing Data StationsPage Video Conferencing Configuration Page B Data Module Settings Kbps 7500B Data Module and CSU Settings Initializing the System Initializing and Testing System Perform a System Erase frigid start Programming GuidesRestoring from the Translation Memory Card Restoring from the System Programming Disk Testing the System Setting the Time and DateTesting MLX Telephones Page Press the unlabeled display buttons Testing MLX Display TelephonesTesting MLX Telephones with MFMs Hang up the handset to leave test mode Turn off the Message light Testing Telephones for Dial ToneTesting Telephones for Outside Dial Tone Hang up Testing Analog Multiline Single-Line Telephones Dial *03 followed by the trunk ID number 01 through Testing did Trunks Testing Two-Way Automatic-Start Tie Trunks Testing Tie TrunksTesting Incoming Automatic-Start Tie Trunks Testing Outgoing Automatic-Start Tie Trunks Verify that you have good two-way communication and hang up Testing Two-Way Dial-Repeating Tie TrunksTesting Incoming Dial-Repeating Tie Trunks Testing Outgoing Dial-Repeating Tie Trunks Testing Selected System Features Group Calling Test ARS and Smdr Tests Coverage Test System Speed Dial Test Testing Night Service Testing the DSS Testing the Paging System Testing the Dictation System Make an announcement into the handset Testing Music On HoldHang up Repeat Steps 1 through 3 for all paging zones Ground-Start Button Testing the Power Failure Transfer Jacks Have that person call the number after you hang up Testing Touch-Tone ReceiversIf you hear reorder tone, try again Installing the Top Cover Installing the Control Unit’s HousingRepeat the test for each TTR Top Cover Installing the Control Unit Front Cover Installing the Front Cover Installing Applications Voice Messaging Systems Touch-Tone Receivers Automated Document Delivery System Hardware Requirements Call Accounting System Hardware and Software Requirements Page CAS Documentation Call Accounting Terminal 8Installing Applications CAT Documentation Call Management System Hardware and Software Requirements CMS Documentation Consideration Conversant Conversant Intro Documentation Integrated Solution Hardware Requirements Installing Applications AT&T Attendant Merlin Mail Ports Required Number of Jacks Required Merlin Mail Considerations Hardware Requirements Merlin PFC Hybrid/PBX and Key Modes Behind Switch Mode PassageWay Direct Connect Solution Hardware Requirements System Programming Maintenance SPM Hardware Requirements Page Upgrading the System Removing the Control Unit Housing Removing the Control Unit Housing 4Upgrading the System Powering Down the System Replace the processor module. See Figure Install any expansion carriersInstall or replace any modules Upgrading the Control Unit Remove the housing clips from the right side of the module Replacing the Housing Clips Beware of hazardous voltages Replacing a Module in the Carrier Modifying the Processor For Key Mode Removing the Processor Module Cover Removing the Processor Module Circuit Board Changing the Key Mode Switch Position to Closed Install SPM Backup system programming Completing the Upgrade Remove the control unit housing Convert the backup fileIf applicable, program new features Install SPM Release 2.0 or Earlier Replace the control unit housingProgram the system Installing the Control Unit Housing Completing the Upgrade 18Upgrading the System System Numbering Forms Figure A-1. Form 2a, System Numbering Extension Jacks Form 2a, System Numbering Extension JacksPage Figure A-2. Form 2b, System Numbering Digital Adjuncts Form 2b, System Numbering Digital Adjuncts Figure A-3. Form 2c, System Numbering Line/Trunk Jacks Form 2c, System Numbering Line/Trunk Jacks Figure A-4. Form 2d, System Numbering Special Renumbers Form 2d, System Numbering Special Renumbers Unit Load Calculation Worksheet Unit Load Worksheet Did Module Qty Unit Load = Total Unit Load Hybrid/PBX or Modified = Total Square Network Access LinesQty Equipment Telephones Optional Equipment Page DS1 GS/LS Qty Unit Load = Total Hybrid/PBX or Modified Square Page Unit Load Calculation Worksheet 10Installation Index IN-2Installation Installation IN-3 IN-4Installation Installation IN-5 IN-6Installation Installation IN-7 IN-8Installation Installation IN-9 Index IN-10Installation Maintenance and Troubleshooting All Rights Reserved August Copyright 1994, AT&T Contents Error Logs, Access Logs, and System Inventory Central Office Problems GL Glossary Index Figures Backing Up with a Memory CardChapter Name Function of PC Keys in SPM Tables LMPORTANT Safety lNSTRUCTlONS Page Safety Safety Xiv Maintenance and Troubleshooting About This Book Terms and Conventions Used On next Typographical Conventions Product Safety Labels System operator Support Document No. TitleSystem Documents Telephone User Support Miscellaneous User Support Document No TitleDocumentation for Qualified Technicians Feedback Form Equipment Maintenance Terminal Tools Setting Up the MLX-20L Console On-Site Programming MaintenanceMLX-20L Failure Figure l-l. Setting Up the MLX-20L Console Setting Up the PC Setting Up the PC Remote Programming Maintenance Connect the PC and modem Setting Up Equipment for Remote Maintenance Press any key Using SPMStarting SPM With a Direct Local Connection Dialing the System Operator When you hear the modem tone, hang upEnter the password With a Local or Remote Modem Connection Dialing the Modem Directly Select an option Console Display/Instructions SPM Display SPM Display Conf Function of PC Keys in SPM Console SPM Function ←Bksp Removing the Control Unit Housing Preparation for Hardware MaintenanceExiting SPM 16Introduction Disconnecting AC Power Disconnecting AC Power Maintenance Strategy Maintenance Strategy Trouble Reports AlarmsAutomatic Tests System Restarts Clearing Alarms Cold Start Restart Warm Start Frigid Start System Erase Check the Error Logs Check Telephone ProblemsIsolating the Trouble Check the Access Log Trouble Accessing the Error LogsCheck the power supply LED Check the Control Unit Carrier Check the Power SupplyCheck the Processor Check the Modules Check the Trunks Escalating the ProblemCheck the Central Office Unit Loads for Key or Behind Switch Mode Unit Loads for Hybrid/PBX ModeChecking Unit Loads 28Introduction Error Logs Error Logs, Access Logs, System Inventory Summary Checking the Error LogsTransient/Permanent Error Thresholds Code Error Description More → More → Error Log Select Error Log From the Maintenance menu, select the System optionSelect an error log option Console Display/Instructions Additional Information PC Checking Transient Errors Interpreting Error Codes Checking the Last 10 Errors 000l Error Codes Action Description Start Error Action Codes Description 8Error Logs, Access Logs, and System Inventory Full Error Codes Description Action 10Error Logs, Access Logs, and System Inventory 6COA DS1 PRI B-CH Group Inconsist 7404 Error Codes Descrption Action Not in Standby Mode Miscellaneous Error On Hook Before Ready 840D Incorrect Firmware State Reviewing the Access Log Access Log Scanning the Log Display the first screen of the Access Log More System Inventory Select the Inventory option Reviewing the Screen Xx = slot number entered in Step Phantom Modules Telephone Problems General Telephone and Wiring Problems Fixing Telephone ProblemsTroubleshooting Telephone Problems Symptom Section Check the LEDs on the module If the LEDs do not light, retest the original telephone Analog Multiline Telephone ProblemsVoice Transmission Problems Move the T/P switch to its normal position Call Forwarding Problems Single-Line Telephone Problems MLX Telephone Tests LEDs should toggle on and off If these tests fail, replace the MFM System Requirements For Touch-Tone ReceiversMLX Telephone Display Buttons System Requirements for Touch-Tone Receivers Modules with TTRs No. of TTRs Backing Up System Programming Control Unit Problems Checking the Power Supply Power Supply ProblemsChecking the LED Checking the Interlocking Post Replacing the Ring Generator Power Supply Interlocking Post App. Code PEC and Apparatus Codes for 012 Modules 6Control Unit Problems Replacing a Ring Generator Replacing Auxiliary Power Units Replacing an Auxiliary Power Supply Power down the system Replacing the Power Supply Insert a new power supply Peek Processor Problems Specify Slot From the Maintenance menu, select the Slot optionSelect the Demand Test Dial a memory address Select the Peek option Continue Poke Select Poke two times Console Display/Instructions Additional InformationSelect Continue System Erase Frigid Start Select System Erase twice Select Yes Forced Installation of System Software Menu →Maintenance →System → Inserting a Memory Card Select Upgrade/install Initiate the software installationObserve the memory card validation screens MemCard Rel Vnn.mm Current If the release number is the one you want, select Yes Restore system programming Error Conditions During Forced Installation Processor Problems Memory Card Is Wrong Type Missing Card or Card Not Inserted CorrectlyMemory Card Is Corrupt System Busy Other Error ConditionsPower Cycle During Installation Removal of Memory Card During Installation Pressing hidden key two times will delete existing program Replacing the Processor Module Install the new processor module Power up the systemIf possible, save system programming Replacing the Feature Module Replacing the Feature Module Module Tests Module Problems Module Test Process Module Test Process Test Notes Busy-Out/ResetPower supply System Components For 100D modules, continue with the CSU Ioopback test Busy-out or reset the moduleRun the internal Ioopback test Run the board controller test Busy-Out and Reset Persistent Module Problems Specify the slot number n=00 to Busy-Out Summary Select Busy-Out Console DispIay/Instructions Console Display/Instructions Additional Information P C Reset Summary Specify the slot number nn = 00 to Select Reset Restore Specify the slot number n= 00 to Enter →Restore →Yes Select the Restore option Internal Loopback Test Menu →Maintenance →Slot Select Demand Test Specify the slot number nn = 00 toSelect Internal Loopback Test Screen below smearsI Interpreting Test Results Slot empty or not valid Restoring the Module Board Controller Test Select the Board Controller Test Board aaaaaaaaaaaaaaaaa Select Test Once or Repetitive Channel Loopback Test Summary Specify the MLX module’s 2-digit slot number nn = 00 to From the main menu, select the Slot optionSelect the B-Channel Loopback test Screen below appears only if the test fails Replacing Modules Channel Loopback Errors Error Messages Corrective Action To replace a module, follow the steps below Checking Unlabeled Wiring Upgrading Circuit Module Firmware Summary Inserting the Upgrade Memory Card Specify the slot number nn =00 to Select Upgrade Module Problems Screens below appear during the procedure Observe the status screen below Memory Card In Use By Another Feature Error Conditions During Firmware Upgrade Module Cannot Be Upgraded Select Exit and reinitiate the upgrade procedure Module Error Flash ROM Fails to Erase Memory Card File ErrorXx = slot selected in Step Upgrade Attempted on an Empty Slot 100D Module ProblemsBoard Memory Programming Failure CSU Loopback Test Error Events Busy-out the 100D module Prepare the CSU 551 T1 CSU Loopback Connection ESF T1 CSU DTE Loopback Connection A t T e x t C n f i g U E S FS t P b k L p b k P t r n s O p b a c k O p b a c k O r t L L B P L BLLB PLB DLB Select the CSU Loopback Test Specify the 2-digit slot number Nn = 00 to Screen below appears when the test fails Fmwr not in Standby Node Automatic Tests for the 100D Module 100D Module Error Events Specify the 2-digit slot number nn= 00 to Select Error EventsSelect the current hour or a previous hour Enter →Clock →Exit 100D Module Clock Status Select Clock From the Maintenance menu, select. the Slot option Removing the Faulty Carrier Carrier ProblemsUnplug the control unit from the AC outlet Replacing the Carrier Checking System and Slot StatusSystem Status Select Status Green LED Interpreting the System Status ScreenRed LED Yellow LED →Enter →Status Slot Status F10 Select the Status option LED Checking System and Slot Status 92Control Unit Problems Troubleshooting Trunk Problems Trunk Errors Troubleshooting Trunk Symptoms Section Manual Correction of Trunk Problems Check for outside dial tone at the network interface Outgoing Trunk ProblemsIf the module continues to malfunction, replace it Place an incoming call through the troubled trunk Incoming Trunk ProblemsTesting Trunks Automatically Maintenance-Busy Status Maintenance-Busy Causes Permanent Errors TieTrunk Maintenance-Busy ProgrammingGround-Start GS Trunk Loop-Start LS Trunk Checking Ports Checking Trunk Maintenance-Busy Status Summary Select the Line/Trunk Option From the Maintenance menu, select the Port option Next trunk Checking Extension Maintenance-Busy Status SummarySelect trunk Status Xxx = line number entered in Step Select Next to see the status Select the Station extension option Busying-Out a Trunk Summary Specify the dial plan number line for the trunk nnn = 801 to Busying-Out an Extension Summary 14Central Office Problems Screen below appears when Busy-Out is completed successfully Restoring a Trunk Summary Additional Information Restoring an Extension Summary Select Restore → F1 → F3 Resetting an RS-232 PortConsole Procedure PC Procedure Specify the RS-232 port Resetting the Processor’s Internal Modem Summary Select the Modem option Screen below is shown until Reset fininshes or fails Auditing Lines Summary Auditing DS1 PRI B-Channels Select the B-Channel option Select Audit Line Auditing Calls Summary Select Audit Call Installing the Control Unit Housing Release 2.1 or Later Conclusion of Hardware Maintenance To install the front cover, see -2and follow these steps Installing the Control Unit Top Cover Release 2.1 and Later Conclusion of Hardware Maintenance Front cover Assemble the control unit housing. See Figure Installing the Control Unit Housing Release 2.0 or Earlier Assembling the Control Unit Housing Release 2.0 and Earlier Installing the Control Unit Housing Release 2.0 and Earlier Support Telephone Number Customer Support Information Customer Support Information FCC Notification and Repair Information Page Installation and Operational Procedures DOC Notification and Repair Information DOC Certification No 4095A CSA Certification No. LR Load No Customer Support Information Maintenance and Troubleshooting A-9 10Maintenance and Troubleshooting Security of Your System Preventing Toll Fraud Page Limited Warranty Limitation of Liability 14Maintenance and Troubleshooting Limitation of Liability Voice Mail SystemsPage Remote Administration Maintenance Page Figure B-1 Figure B-1. Form 2a, System Numbering Extension Jacks Page Figure B-2. Form 2b, System Numbering Digital Adjuncts Figure B-3. Form 2c, System Numbering Line/Trunk Jacks Figure B-4. Form 2d, System Numbering Special Renumbers Unit Load Calculation Worksheet Unit Load Worksheet MLX Network Access Lines Optional Equipment Page Telephones Unit Load Calculation Worksheet Page Page Backing Up with a Memory Card Card Types Figure D-1. Pcmcia Transition Memory Card Figure D-2. Inserting the Memory Card Inserting the Card Unformatted Card Memory Card Formatting Format Warning Summary Backup BackupProcedure Backup Select Backup Select Back/RestoreSelect the System menu Rename the backup file n = 1 to 11 characters Select the backup filenameSave your entry Observe the backup completion screen Observe the backup progress screenRespond to the prompt Summary Automatic Backup Automatic Backup Select Auto Backup Procedure Automatic Backup Select Off Make a selection Erase the current daily backup time Daily Backup Procedure Erase the current weekly backup day and time Backup Messages Card Removed While Backup Is in Progress Backup Canceled= backup filename Card Is Write-Protected Card Missing or Card Not Inserted Correctly Card Failure Summary Restore Select Restore Procedure Restore Observe the restore file validation screen Select the restore fileObserve the restore progress screen Card Missing or Card Not Inserted Correctly Restore Messages Wrong System Programming Port Card Removed after Confirmation Card Failure after Confirmation Release Mismatch Board Mismatch Wrong Type of Card Strap in Place for Key Mode but Mode is Set To Hybrid Release 2.1 and Earlier Modifying a Release 2.1 or Earlier Processor for Key Mode Figure E-1. Modifying the Processor for Key Mode Installing the Control Unit Housing Release 2.1 and Earlier Figure E-2. Installing the Control Unit Housing ALS Adds Ascap AMIANI ARS AT&T Attendant AT&T Switched Network Audix Voice PowerAsynchronous data Transmission B8ZS BIS Board assignment Board renumbering Bus Button Byte CAT CASCCS CMS CRC CORCSU DFT DCEDHG Did DS0 DLCDnis DOS EIA DSS DTE ESS ESF FCC GPA Frame Framing format frequency generatorFRL General-Purpose Adap See GPA Glare HFU HfaiIclid II/III Jack Kbps Key modeIsdn Isdn 7500B Data Module LDN LANLED Loop-start trunk AccessLocal loop Logical ID MLX-10 or MLX-10D telephone MFMMLX-10DP Glossary OPX OPT PBX PRI PFT RAM QCC SID ROMSAA SDN Smdr Simplex signalingSingle-line telephone Slot System date System acceptance test System Access buttonsProgramming Maintenance Supplemental Alert See SAA Adapter TTR TDM VMI UPSVAC VDC Maintenance and Troubleshooting IN-1 IN-2Maintenance and Troubleshooting Maintenance and Troubleshooting IN-3 IN-4Maintenance and Troubleshooting Maintenance and Troubleshooting IN-5 Index