32SYNCHRONIZATION of Digital Facilities | AT&T DS1/DMi/ISDN-PRI

5-32SYNCHRONIZATION OF DIGITAL FACILITIES

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AT&T DS1/DMi/ISDN-PRI manual 32SYNCHRONIZATION of Digital Facilities

Contents

AT&T Page Contents DS1 Transmission and Cabling LOSS-PLAN Implementation and Provisioning Digital Loss PlanSynchronization of Digital Facilities Need for Synchronization Synchronization Hierarchy Port TYPES/INSTALLATION Compatibilities Administration Options and Requirements Generic System 75 R1V2 and R1V3 Maintenance and Alarms Administrative Procedure Summary Procedure GL-1 AB-1Glossary Index List of Figures Contents Xiv Contents Procedure 012 Word 1 Name Database Generic Figure A-1 DS1 Circuit Pack Screen List of Tables Bccos User-to-User IE Opcodes About this Document Purpose HOW this Document is Organized Intended AudiencesPrerequisite Skills and Knowledge About this Document AppendixesAbbreviations Glossary Index Related Sources HOW to USE this DocumentTrademarks and Service Marks HOW to Make Comments about this Document AT&T Xxiv about this Document Fundamentals of DS1 Signals Introduction 2INTRODUCTION Layer Introduction Megacom 4INTRODUCTION Introduction 6INTRODUCTION Channels Voice Voice-grade data Digital data 8INTRODUCTION Channel Backup Generic Channels D4 Framing Circuit-Switched Versus Packet-Switched ChannelsFraming Formats 10INTRODUCTION D4 Framing Bits Robbed BIT Optional Data Link Signal Frame Sync PatternESF Framing DS1 Signal, Framing Format, and ESF Superframe 24 Frames 24th-Channel Signaling Signaling TypesRobbed-Bit Signaling 14INTRODUCTION Superframe Frame No Signaling SuperframeESF 16INTRODUCTION Line-Coding FormatsAlternate Mark Inversion 1s-Density Requirement Zero Code Suppression and Bipolar with 8 Zero Substitution 18INTRODUCTION Restricted ChannelUnrestricted or Clear Channel Violations Based on Polarity Last 1 Transmitted Differences Between ZCS and B8ZSIntroduction Uncoded BIT Stream Pulse 20INTRODUCTION Bipolar ViolationsCommunication Protocols and 1s-Density Requirement Data DMI Alternate Voice/Data AVD Trunks Common-Channel SignalingImportant Concepts 22INTRODUCTION Bearer Capability BC System 85 R2V4 Generic 24INTRODUCTION Isdn Call Processing Switch Parameter Default ValueBccos Outgoing Calls 26INTRODUCTION Incoming CallsSummary Introduction 28INTRODUCTION CBC Service SelectionSystem 85 R2V4/Generic 2 CBC Implementation Generic 1 Implementation Networking Restrictions and ISDN-PRI Limitations 30INTRODUCTION Introduction 32INTRODUCTION Network Difficulties Hyperactivity 2NETWORK Connections and Configurations Glare Host Computer to Another System Network Connections and ConfigurationsDS1/DMI PRIVATE-NETWORK Connections IBM Idnx Multiplexer to Another System Other Vendor Digital Switch to Another System4NETWORK Connections and Configurations Analog Switch to Another System OPS to Another System Via a D4-Channel Bank 4ESS to Another System Special-Access Connection DS1/DMI PUBLIC-NETWORK Connections 5ESS to Another System Screening Intra-LATA CallsSynchronization Analog CO to Another System Via a D4-Channel Bank 8NETWORK Connections and ConfigurationsDacs to Another System DS1/DMI TERMINAL-EQUIPMENT Connections CDM 10NETWORK Connections and Configurations CEM to a BCM32000 Network Connections and Configurations System 85 R2 to a System 85 R2V4, Generic 1, or Generic 12NETWORK Connections and ConfigurationsISDN-PRI PRIVATE-NETWORK Connections ISDN-PRI PUBLIC-NETWORK Connections System 85 R2V4, Generic 1, and Generic 2 to a 4ESS Codeset Backup D-Channel14NETWORK Connections and Configurations User-to-User Information transfer System 85 R2V4, Generic 1, or Generic 2 to a Dacs Network Specific FacilitySynchronization System 85 or Generic 2 ISDN-PRI to a 5ESS 16NETWORK Connections and Configurations DS1 Transmission and Cabling Network Channel Terminating Equipment Ncte Metallic Cabling OptionsDSX-1 Distance Limitations 2DS1 Transmission and Cabling DS1 Transmission and Cabling On-Premises CablingDirect Under 1310 Feet 4DS1 Transmission and Cabling Between 1310 and 4310 FeetGreater Than 4310 Feet Maximum DSX-1 DS1 Off-Premises CablingMaximum FT or Less Maximum Distance of 4311 or More DSX-1 T E DS1 Nonmetallic Cabling Options6DS1 Transmission and Cabling Maximum CEM and CDM Cabling Configurations DS1/DMI DSX-1 Media Dedicated Channel Units Applications CDM only CDM DSX-1 Or D4 ChannelANY DS1 DSX-1 Channel Bank Transmission AWG Abam & 24 AWG PDS Line Equalizer and Compensation SettingsSystem 85 Traditional Modules OFF 10DS1 Transmission and Cabling Digital Loss Plan 2THE Digital Loss Plan LOSS-PLAN Implementation and ProvisioningGeneric Encode Loss-Plan Function ANSI/EIA/TIA-464-A-1989 Designator Digital Loss Plan Loss Loss planDigital conn PORT-TO-PORT Loss Values A L Analog Facility DS1/DMI Digital Switch Channel Bank N K ONSTransmit Receive Direction Tie Trunk Ports DS1/DMI/ISDN-PRI Port LossesTerminating a DS1 AT a Channel Bank CO did Trunk Ports OPS Ports 8THE Digital Loss Plan Synchronization of Digital Facilities Need for Synchronization Channel Analog Bank Receive 2SYNCHRONIZATION of Digital FacilitiesTransmit Bank Transmit Digital BIT Stream Synchronization Hierarchy Synchronization of Digital Facilities 4SYNCHRONIZATION of Digital Facilities Page 6SYNCHRONIZATION of Digital Facilities System 85 and Generic 2 Synchronization Architecture Page System 85 and Generic 2 Synchronization Software Operation Blue YEL Good LOS Misf Primary Secondary Reference IndicatorsIndicators RED System 75 and Generic 1 Synchronization Architecture System 75 and Generic 1 Synchronization Software Operation Criteria for Switching to the Secondary Reference Criteria for Switching Back to the Primary Reference External Synchronization Clock 14SYNCHRONIZATION of Digital Facilities Synchronization of Digital Facilities 16SYNCHRONIZATION of Digital Facilities External-Clock Interface 18SYNCHRONIZATION of Digital Facilities Selecting a Timing Source for the SwitchNetwork Synchronization and Engineering Internal Reference Selection Rules Rule 20SYNCHRONIZATION of Digital Facilities Digital Transmission Facilities Primary Frequency Reference 13.Proper Use of Backup Facilities Page 15.Optimal Diverse Routing 16.Less Than Optimal Diverse Routing 17.Excessive Cascading 19.Excessive Synchronization from One Node 26SYNCHRONIZATION of Digital Facilities External-Reference Selection Rules Rules 2 Through Fact Availability of Synchronization SourcesMisconception 28SYNCHRONIZATION of Digital Facilities USE of Generic 2 AS a System Clock Reference Line-Only Mode DS1/DMI-BOS ANN11 or TN767Conclusions on Synchronization ISDN-PRI Trunk Facilities ANN35 or TN767 with TN755 USE of Generic 1 AS a System Clock Reference Line+Trunk Mode DS1/DMI-BOS ANN35 or TN767 with TN555DMI-MOS ANN35 or TN767 with TN755 Trunk-Mode ISDN-PRI TN767 Line-Only Mode DS1/DMI-BOS TN767 Trunk-Mode DS1/DMI-MOS TN767 32SYNCHRONIZATION of Digital Facilities Port TYPES/INSTALLATION Compatibilities DMI-BOS E 2PORT TYPES/INSTALLATION CompatibilitiesFX, Wats Port TYPES/INSTALLATION Compatibilities Generic 1 DS1/DMI-BOS Operating Mode4PORT TYPES/INSTALLATION Compatibilities Supported Port Types Generic 1 ISDN-PRI Line-Only ModeDMI Trunks System 85 DS1, Traditional Modules ANN11 Line+Trunk Mode 6PORT TYPES/INSTALLATION Compatibilities Port TYPES/INSTALLATION Compatibilities OPS Other Circuit Packs OPS PORTS/CARRIER Slot Others Port TYPES/INSTALLATION Compatibilities Carrier Slots P T Y Line+Trunk Mode Port Grouping Rules 10PORT TYPES/INSTALLATION Compatibilities Ground-Start CO Trunk DMI-BOS TrunksDid Trunk Of-Premises Stations 12PORT TYPES/INSTALLATION CompatibilitiesLoop-Start CO Trunk Transparent Ports System 85 DS1 or DMI-MOS, Traditional Modules ANN35 14PORT TYPES/INSTALLATION Compatibilities Port Grouping Rules Administration Options and Requirements 2ADMINISTRATION Options and Requirements System 85 R2V1 Through R2V4 Procedure 275 Word 4 Isdn Service Enable/DisableAdministration Options and Requirements System Field 4ADMINISTRATION Options and Requirements System Procedure 276 Word 1 Other Feature GroupsProcedure 250 Word 1 DS1 Carrier Designation Display only Module Control V1-V4Position Procedure 260 Word 1 DS1/DMI/ISDN-PRI Physical Interface Can be assigned Service or Facility OptionsSlot numbers 0, 5, 13, or 18 for line-only operation V1-V2 Voice/data AVD V3-V4 10ADMINISTRATION Options and Requirements System Criteria for Switching to the Secondary Facility Criteria for Switching Back to the Primary Facility 12ADMINISTRATION Options and Requirements System DS1/OPS Related Translations 14ADMINISTRATION Options and Requirements System DS1 Channel Slot/Circuit Supported. Therefore, option one is not applicable DS1/DMI-BOS applications should be administered with aV4 Only Fields Procedure 262 Word 1 Isdn Board Parameters16ADMINISTRATION Options and Requirements System PRI Parameters Field Procedure 354 Word 3 NPA-NXX Digits Assignment Procedure 000 Word 4 NPA-NXX Index Designator Enhanced Mode Procedure 354, Word NPA-NXX Assignment 20ADMINISTRATION Options and Requirements System Range of 1 through 22ADMINISTRATION Options and Requirements System Field Dial Access CODE/TRUNK ID Code 24ADMINISTRATION Options and Requirements SystemEnhanced Mode Procedure 100, Word Trunk Group Translation Isdn TIE Trunk Description TypeDid Wats Procedure 100 Word 2 Trunk Group Data Translations Administration Options and REQUIREMENT’S System Data Rate Procedure 100 Word 3 Isdn Trunk Group Signaling OptionsModem Pooling Sychronous Duplex 28ADMINISTRATION Options and Requirements System Field Isdn network features is desired Field 1 Field 32ADMINISTRATION Options and Requirements System Fields Fields 9-11 Field This field is ignored by Isdn software 34ADMINISTRATION Options and Requirements System Procedure 116 Word 1 DS1/DMI/ISDN-PRI Trunk Assignments 36ADMINISTRATION Options and Requirements System DS1/ISDN-PRI Administration Channel Versus Trunk Assignments Procedure 012 Word 1 Name Database 38ADMINISTRATION Options and Requirements System Through 99999, for extension and directory numbers Procedure 012 Word 2 Name Database Charater Encodes Procedure 012 Word 3 Name DatabaseEnhanced Mode Procedure 012, Word Name Database Entry 42ADMINISTRATION Options and Requirements System Enhanced Mode Procedure 012, Word Name Database Compaction Enhanced Mode Procedure 309, Word ARS Route Tables IXC Isdn 44ADMINISTRATION Options and Requirements System Bearer Capability Network Feature Value Trunk Type Network Service/Feature Options, shows the relationshipsNetwork Service or Isdn Enhanced Mode Procedure 321, Word AAR Route Tables AAR System 85 R2V4, depicts the procedure46ADMINISTRATION Options and Requirements System Bearer Capability NSF Procedure Word FieldNSF IXC TNS 23. Procedure TTL Telephone Digits Terminating Test Line Telephone Digits Generic Administration Options and Requirements GenericMaximum Preemption Level Administrable Alarms Attendant Release Loop Operation 52ADMINISTRATION Options and Requirements Generic SNC Procedure 250 Word 1 SC/DS1 Carrier Designation 54ADMINISTRATION Options and Requirements Generic Field Fields SC Information Connected to CC0 ON-LINE Enter command Equipment Traditional Universal Parameter Module ISDN-PRI That Zero Code Suppression ZCS Criteria for Switching to the Secondary Criteria for Switching Back to the Primary Field 62ADMINISTRATION Options and Requirements Generic Field Distance to Midpoint Compensation Or Endpoint FT 133 to 90 to 266 to 180 to 399 to 270 to 532 to 360 to BRI Only PRI and BRI Layer 2 Parameters Depending on the particular facility Procedure 262 Word 2 ISDN-PRI D-Channel Backup NFAS-PRI Only Primary D-CHANNEL Equipment Location 68ADMINISTRATION Options and Requirements GenericBackup Channel Equipment Location Procedure 262 Word 3 ISDN-PRI Codeset Map Assignments Performance Mapped to CODESET/INFORMATION Element Enhanced Mode Procedure 280, Word Isdn Codeset MappingMapped from CODESET/INFORMATION Element Field Field 6 Field IE Name Codeset NXX Enhanced Mode Procedure 354, WordNPA 34.Procedure 000 Word 4 NPA-NXX Index Designator 74ADMINISTRATION Options and Requirements Generic NPA-NXX Enhanced Mode Procedure 210, WordLDN Procedure 014 Word 1 Bccos Routing Options Differences Between System 85 R2V4 and Generic COS Default Capabilities Call Types and Action Taken Procedure 014 Word 2 Bccos Data Options 78ADMINISTRATION Options and Requirements Generic Or is not 0 supported 38.Procedure 010 Word 4 Terminal COS Restrictions Generic 80ADMINISTRATION Options and Requirements Generic Field 82ADMINISTRATION Options and Requirements Generic Enhanced Mode Procedure 100, Word DMI Isdn 84ADMINISTRATION Options and Requirements Generic 40. Procedure 86ADMINISTRATION Options and Requirements Generic Not applicable For Whether access to other Isdn network features is desired Assigns whether the trunk group has 1 or does not have Procedure 103 Word 1 Network Trunk Group Translations AAR/ARS 92ADMINISTRATION Options and Requirements Generic Channel Versus Trunk Assignments DS1 Channel Slot/Circuit 45.Procedure 012 Word 1 Name Database Generic 94ADMINISTRATION Options and Requirements Generic From 1 to 96ADMINISTRATION Options and Requirements Generic Character Encodes 47.Procedure 012 Word 3 Name Database Generic Field Isdn Network Definition 98ADMINISTRATION Options and Requirements GenericEnhanced Mode Procedure 279, Word NETWORK-SPECIFIC Facility Parameters Name Network Parameterized Feature Facility11. Network Coding Value Binary Procedure 309 Word 1 ARS Route Tables 100ADMINISTRATION Options and Requirements Generic Procedure 309 Word 5 ARS-ISDN Bccos Enhanced Mode Procedure 309, Word 102ADMINISTRATION Options and Requirements Generic Services/Network Features, for the appropriate encodeProcedure 321 Word 1 AAR Tables Generic Enhanced Mode Procedure 321, Word Procedure 321 Word 5 AAR-ISDN and Other Feature Parameters 104ADMINISTRATION Options and Requirements Generic 53.Procedure 107 Word 1 Atms TTL Assignment System 85 R2V4 Procedure 108 Word 1 Isdn Trunk Group TTL Number Digits 106ADMINISTRATION Options and Requirements Generic System 75 R1V2 and R1V3 Service/Facility OptionsDMI-BOS? Maintenance Parameters DS1 Circuit Pack 108ADMINISTRATION Options and Requirements System Compensation Value Distance Feet 109 Remote SlipDetection Loop Synchronization Plan DS1 Circuit Packs 112ADMINISTRATION Options and Requirements System Trunk Group/Trunk Group Members Name DelayPort Mode ACA 114ADMINISTRATION Options and Requirements SystemCall AAR/ARS 60.DS1 Circuit Pack Screen, Common-Channel Signaling 116ADMINISTRATION Options and Requirements Generic Location Line 118ADINISTRATION Options and Requirements Generic Interface 120ADMINISTRATION Options and Requirements Generic STT Trunk Group/Trunk Group Members DS1 Trunk ApplicationsCall COR DTT Avd or data 122ADMINISTRATION Options and Requirements GenericBCC In/out Trunk Group ACA PBX ID Processor Interface Data Module ISDN-PRI Applications With auto ModeNight Channel Data ExtensionPhysical Processor Channel Assignments ISDN-PRI Applications Link Proc ChanAppl Chan Priority DTE/DCE Advantages of CBC Trunking 128ADMINISTRATION Options and Requirements GenericTrunking Considerations ISDN-PRI Applications Network Facilities ISDN-PRI Applications FeatureEither a feature 0, or service NETWORK-FACILITIES COR TAC CodingTrunk Group ISDN-PRI Trunk Applications Service Type Dial AccessService Options access, tie Max SendDisplay/TCM Message Size SID/ANI Trunk FeaturesSID? 134ADMINISTRATION Options and Requirements Generic Application Example #2 DelApplication Example #1 SID/ANI InsertPer Call Case Application for Case 3 being selected Application for Case 1 being selected most restrictiveApplication for Case 2 being selected 138ADMINISTRATION Options and Requirements Generic Application for Case 4 being selected Trunk Group Usage Allocation ISDN-PRI Applications Applications for CasesExample Screen Entries for Cases PBX Allocation 140ADMINISTRATION Options and Requirements GenericUsage Plan Min# Chan Max# Chan An Example Application for Usage Allocation Plans Number Scheduled 142ADMINISTRATION Options and Requirements GenericFixed CBC Trunk Group Usage Allocation Plan Assignment Schedule Trunk Group Member Assignments ISDN-PRI Trunk Applications 75.Trunk Group Screen, Page 5 ISDN-PRI SID Prefix Table ISDN-PRI Applications 144ADMINISTRATION Options and Requirements GenericName Night SID Prefix An Example Application that uses SID Ext CodeSID Prefix 146ADMINISTRATION Options and Requirements Generic Routing Patterns ISDN-PRI Applications Grp No PatternNumber FRL Digits 148ADMINISTRATION Options and Requirements GenericNo. Del Inserted Band Hunt Group ISDN-PRI Applications Hunt Group 150ADMINISTRATION Options and Requirements GenericTerminating Extension Group ISDN-PRI Applications ACD? Terminating Extension Group 152ADMINISTRATION Options and Requirements Generic Generic 1 and Generic 2 ISDN-PRI Maintenance Philosophy Generic 2 Maintenance Capabilities and Concerns Generic 2 Maintenance Procedures 2MAINTENANCE and Alarms Maintenance and Alarms 4MAINTENANCE and Alarms Summary of Generic 2 Maintenance Capabilities 6MAINTENANCE and Alarms Generic 1 Maintenance Capabilities and ConcernsGeneric 1 Maintenance Procedures Circuit Pack Alarms Summary of Generic 1 Maintenance CapabilitiesAlarms Yellow LED LFA Alarm Facility AlarmsExcessive Misframe and CRC Errors 8MAINTENANCE and Alarms Remote Frame Alarm Loss of Signal Alarm Framing Mode Alarm Type Conversion Blue AlarmMajor and Minor Alarms 10MAINTENANCE and Alarms Administration Requirements PBX ID ACA 2ADMINISTRATION RequirementsMegacom COR Administration Requirements 4ADMINISTRATION Requirements Figure A-5.Trunk Group Screen, Page 1 SDN DCS? PBX ID 6ADMINISTRATION Requirements Facilities, for details TRANSLATIONS-BASED Problems Dacs 2SAMPLE Installation and Maintenance Problems Transmission Facility Sample Installation and Maintenance Problems Trunks and Trunk Groups 4SAMPLE Installation and Maintenance Problems Type System CDMsCEMs DS1 or DMI 6SAMPLE Installation and Maintenance Problems Sample Installation Maintenance Problems D4-Channel Banks SYNCHRONIZATION-RELATED Problems 8SAMPLE Installation and Maintenance Problems Loss of or No Synchronization Leavenworth Loop D4 Synchronization Problems Figure B-10.Leavenworth Loop on the Primary Reference Sample Installation and Maintenance Problems Dacs Digital CO Synchronization Problems12SAMPLE Installation and Maintenance Problems Typical Physical Interface Connection Problems Figure B-15.Synchronization from Dacs Node 14SAMPLE Installation and Maintenance Problems Initial System 85 DS1 or DMI Pinout for 50-PIN Connector C6C To WIRE-LUGS Installation Maintenance ProblemsCABLE/CONNECTORS Initial or OLD PDS Compatible System System Intracabinet 16SAMPLE Installation and Maintenance Problems Specific Cabling Options 18SAMPLE Installation and Maintenance Problems Permitted Cabling Combinations Permitted Cabling Combinations Using PDS Using cable GR-380 20SAMPLE Installation and Maintenance Problems Permitted Cabling Combinations Using PDS 22SAMPLE Installation and Maintenance Problems Procedure 000 Word 3 Generic 2 Only Voice Mode Voice Grade Data Unknown Digital Analog Mode 3/2 2ADMINISTRATIVE Procedure Summary Administrative Procedure Summary Procedure 000 Word 4 System 85 R2V4 & GenericProcedure 010 Word 4 System 85 R2V4 & Generic Isdn Routing Parameters System 85 R2V4 & Generic Voice or Voice Grade Data 4ADMINISTRATIVE Procedure SummaryBC System 85 R2V4 Only Procedure 012 System 85 R2V4 & Generic Procedure 100 Word 1 System 85 R2V4 & Generic Rules for Trunk Type 120 System 85 R2V4 & Generic Procedure 100 Word 2 Generic 2 Only6ADMINSTRATIVE Procedure Summary TCM Procedure 100 Word 3 System 85 R2V4 & GenericProcedure Called-Party Number IE System 85 R2V4 & Generic Procedure 107 Word 1 System 85 R2V4 & Generic8ADMINISTRATIVE Procedure Summary For international calls that is, a dial Calls For ARS calls Procedure 210 Word 2 System 85 R2V4 & Generic Procedure 108 Word 1 System 85 R2V4 & GenericProcedure 116 Word 1 System 85 R2V4 & Generic Procedure 260 Word 1 System 85 R2V4 & Generic 10ADMINISTRATIVE Procedure Summary Procedure 279 Word 1 Generic 2 Only Procedure 262 Word 3 Generic 2 OnlyProcedure 275 Word 4 System 85 R2V4 & Generic Procedure 280 Word 1 Generic 2 Only Information Element IE Name R2V4 12ADMINISTRATIVE Procedure SummaryIE Opcode Value Information Element IE Name Opcode Value Field 4, Isdn Trunk Type Procedure 309 Word 5 System 85 R2V4 & GenericField 5, Network Service Value Through 288 Outwats Band NSFs SDN NSF 14ADMINISTRATIVE Procedure SummaryNSF IE System 85 R2V4 Megacom NSF Wats NSF Accunet via encode NSF IE Generic Fields 6-10 System 85 R2V4 16ADMINISTRATIVE Procedure SummaryBC System 85 R2V4 and Generic Field 6 Generic Procedure 321 Word 5 System 85 R2V4 & GenericProcedure 354 Word 3 System 85 R2V4 & Generic Procedure 420 System 85 R2V4 & Generic 18ADMINISTRATIVE Procedure Summary Administrative Procedure Summary 20ADMINISTRATIVE Procedure Summary Trunk Type and Signaling Type Compatibility Tables Trunk/Signaling Cross-references 2TRUNK Type and Signaling Type Compatibility Tables Aplt Did Trunk Type and Signaling Type Compatibility TablesWats TIE CAS MAIN/SAT NDM-I ISDN/PRI EQU 6TRUNK Type and Signaling Type Compatibility TablesTrunk R2V4 G2 Equiv Type Sig. Type Trunk Type and Signaling Type Compatibility Tables 8TRUNK Type and Signaling Type Compatibility Tables ANN11 CBC Ccitt CCR Ccsa CDM CEM COR COS CRC CSU AAR F T C Afrl Aiod ALU ANI ARS Autovon AVD AWGS BC BCC Bccos bps Dacs dB AB-2ABBREVIATIONS Abbreviations AB-3 AB-4ABBREVIATIONS Megacom AccunetAdftc Afrl Aiod GL-2GLOSSARY Data transmissionTandem AWG B8ZS Bit error rate Burstiness Binary serviceParameterized service format Ports, packet switching, See network channel-terminating equipment Glossary GL-5 Q.931 Cross couplingUnrestricted digital data See cyclic redundancy check DTE DS1 DMI-MOSDnis ETN GL-9EIA Epscs GRS Hdlc Inads Clock reference See Integrated Services Digital NetworkIsdn network- See Isdn network identifier. service value GL-12GLOSSARY Station identification number Loss of signalIsdn SID-ANI Lata LFA See loss of frame alignment Mpdm Ncte Network primary rate interface OPS OPXDigital Network primary rate interface Glossary GL-15 PCM PDM PDS PADPAM PC/PBX PRI PAM PCM SDN Robbed-bit signalingSee remote frame alarm See Remote Group See Software Defined Network SS7 See time-multiplexed switch Switch TMSMultiplexed switch Transport mode ZCS Zero code Equal 7-43,7-47,7-101,7-103ISDN Network 7-84,7-88nodal servicesAccunet 6-3,C-16code Adftc Bccos 1-24,C-1 AVD 1-22,7-9BC 1-22,C-16 BC code 7-23,7-81 Violation 1-18,1-20,3-3 9bank D4 1-1,2-5D-type1-1 CcittCEM 9delta DCE 1-21,7-127D-channel COR 7-112,7-125,A-2CRC 1-12,1-14CRV CSU xix, 1-20,3-2customer I -Contd BOS-Contd NPA-NXX7-28,7-72BOS Index IN-5 DTE 2-18 IN-6 IndexDS1- Contd EIA Index IN-7 D4 1-10,2-5,2-7FXS LEC IN-8 IndexLapd 1-3,7-17LATA 2-7layer 1 1-3layer 2 CDM Misframe 1-11,1-14MOVoice 1-23,7-33voice-grade data 1-23,1-24ZCS Index IN-9 NPA-NNX C-17 IN-10 IndexNcte PCM 1-8,5-1PCM data OPSPorts 4-7,6-6 Channel1-5,1-9,7-57facility 7-11,7-59 RNX 1-27robbed-bit signaling Index IN-13 SS7 7-30,7-889sources TMS IN-14 IndexCEM 2-10terminating Members 7-35,7-92Generic 1 CO 2-8,7-13combination tie 2-5,6-4DID 6-11,7-13FX 2-8,7-13ground-start CO 6-11group 108 IN-16 Index