Excessive Cascading | AT&T DS1/DMi/ISDN-PRI manual

	SYNCHRONIZATION OF DIGITAL FACILITIES		5-25

DIGITAL TRANSMISSION FACILITY

PRIMARY FREQUENCY REFERENCE

SECONDARY (BACKUP) FREQUENCY REFERENCE

Figure 5-17.Excessive Cascading

DIGITAL TRANSMISSION FACILITY

PRIMARY FREQUENCY REFERENCE

SECONDARY (BACKUP) FREQUENCY REFERENCE

Figure 5-18.Minimized Cascading

Image 115

AT&T DS1/DMi/ISDN-PRI manual Excessive Cascading

Contents

AT&T Page Contents DS1 Transmission and Cabling Need for Synchronization Synchronization Hierarchy Digital Loss PlanSynchronization of Digital Facilities LOSS-PLAN Implementation and Provisioning Administration Options and Requirements Port TYPES/INSTALLATION Compatibilities Generic System 75 R1V2 and R1V3 Maintenance and Alarms Procedure Administrative Procedure Summary Index AB-1Glossary GL-1 List of Figures Contents Xiv Contents Procedure 012 Word 1 Name Database Generic Figure A-1 DS1 Circuit Pack Screen Bccos List of Tables User-to-User IE Opcodes Purpose About this Document Prerequisite Skills and Knowledge Intended AudiencesHOW this Document is Organized Abbreviations Glossary Index AppendixesAbout this Document Trademarks and Service Marks HOW to USE this DocumentRelated Sources AT&T HOW to Make Comments about this Document Xxiv about this Document Introduction Fundamentals of DS1 Signals 2INTRODUCTION Introduction Layer 4INTRODUCTION Megacom Introduction 6INTRODUCTION Channels 8INTRODUCTION Voice Voice-grade data Digital data Channels Channel Backup Generic 10INTRODUCTION Circuit-Switched Versus Packet-Switched ChannelsFraming Formats D4 Framing D4 Framing ESF Framing Data Link Signal Frame Sync PatternBits Robbed BIT Optional DS1 Signal, Framing Format, and ESF Superframe 24 Frames 14INTRODUCTION Signaling TypesRobbed-Bit Signaling 24th-Channel Signaling ESF Signaling SuperframeSuperframe Frame No Alternate Mark Inversion Line-Coding Formats16INTRODUCTION Zero Code Suppression and Bipolar with 8 Zero Substitution 1s-Density Requirement Unrestricted or Clear Channel Restricted Channel18INTRODUCTION Introduction Uncoded BIT Stream Pulse Differences Between ZCS and B8ZSViolations Based on Polarity Last 1 Transmitted Communication Protocols and 1s-Density Requirement Bipolar Violations20INTRODUCTION DMI Data 22INTRODUCTION Common-Channel SignalingImportant Concepts Alternate Voice/Data AVD Trunks System 85 R2V4 Bearer Capability BC 24INTRODUCTION Generic Outgoing Calls Switch Parameter Default ValueBccos Isdn Call Processing Summary Incoming Calls26INTRODUCTION Introduction System 85 R2V4/Generic 2 CBC Implementation CBC Service Selection28INTRODUCTION Networking Restrictions and ISDN-PRI Limitations Generic 1 Implementation 30INTRODUCTION Introduction 32INTRODUCTION Hyperactivity Network Difficulties Glare 2NETWORK Connections and Configurations DS1/DMI PRIVATE-NETWORK Connections Network Connections and ConfigurationsHost Computer to Another System 4NETWORK Connections and Configurations Other Vendor Digital Switch to Another SystemIBM Idnx Multiplexer to Another System OPS to Another System Via a D4-Channel Bank Analog Switch to Another System DS1/DMI PUBLIC-NETWORK Connections 4ESS to Another System Special-Access Connection Synchronization Screening Intra-LATA Calls5ESS to Another System Dacs to Another System 8NETWORK Connections and ConfigurationsAnalog CO to Another System Via a D4-Channel Bank CDM DS1/DMI TERMINAL-EQUIPMENT Connections CEM to a BCM32000 10NETWORK Connections and Configurations Network Connections and Configurations ISDN-PRI PRIVATE-NETWORK Connections 12NETWORK Connections and ConfigurationsSystem 85 R2 to a System 85 R2V4, Generic 1, or Generic System 85 R2V4, Generic 1, and Generic 2 to a 4ESS ISDN-PRI PUBLIC-NETWORK Connections User-to-User Information transfer Backup D-Channel14NETWORK Connections and Configurations Codeset System 85 or Generic 2 ISDN-PRI to a 5ESS Network Specific FacilitySynchronization System 85 R2V4, Generic 1, or Generic 2 to a Dacs 16NETWORK Connections and Configurations DS1 Transmission and Cabling 2DS1 Transmission and Cabling Metallic Cabling OptionsDSX-1 Distance Limitations Network Channel Terminating Equipment Ncte Direct Under 1310 Feet On-Premises CablingDS1 Transmission and Cabling Greater Than 4310 Feet Between 1310 and 4310 Feet4DS1 Transmission and Cabling Maximum Distance of 4311 or More Off-Premises CablingMaximum FT or Less Maximum DSX-1 DS1 Maximum Nonmetallic Cabling Options6DS1 Transmission and Cabling DSX-1 T E DS1 DS1/DMI DSX-1 CEM and CDM Cabling Configurations ANY DS1 DSX-1 Channel Bank Transmission CDM DSX-1 Or D4 ChannelMedia Dedicated Channel Units Applications CDM only OFF Line Equalizer and Compensation SettingsSystem 85 Traditional Modules AWG Abam & 24 AWG PDS 10DS1 Transmission and Cabling Digital Loss Plan Generic LOSS-PLAN Implementation and Provisioning2THE Digital Loss Plan Digital Loss Plan Encode Loss-Plan Function ANSI/EIA/TIA-464-A-1989 Designator PORT-TO-PORT Loss Values Loss planDigital conn Loss Transmit Receive Direction Analog Facility DS1/DMI Digital Switch Channel Bank N K ONSA L CO did Trunk Ports DS1/DMI/ISDN-PRI Port LossesTerminating a DS1 AT a Channel Bank Tie Trunk Ports OPS Ports 8THE Digital Loss Plan Need for Synchronization Synchronization of Digital Facilities Bank Transmit Digital BIT Stream 2SYNCHRONIZATION of Digital FacilitiesTransmit Channel Analog Bank Receive Synchronization of Digital Facilities Synchronization Hierarchy 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 RED Primary Secondary Reference IndicatorsIndicators Blue YEL Good LOS Misf System 75 and Generic 1 Synchronization Architecture System 75 and Generic 1 Synchronization Software Operation Criteria for Switching Back to the Primary Reference Criteria for Switching to the Secondary Reference 14SYNCHRONIZATION of Digital Facilities External Synchronization Clock Synchronization of Digital Facilities 16SYNCHRONIZATION of Digital Facilities External-Clock Interface Network Synchronization and Engineering Selecting a Timing Source for the Switch18SYNCHRONIZATION of Digital Facilities Rule Internal Reference Selection Rules Digital Transmission Facilities Primary Frequency Reference 20SYNCHRONIZATION of Digital Facilities 13.Proper Use of Backup Facilities Page 15.Optimal Diverse Routing 16.Less Than Optimal Diverse Routing 17.Excessive Cascading 26SYNCHRONIZATION of Digital Facilities 19.Excessive Synchronization from One Node Rules 2 Through External-Reference Selection Rules 28SYNCHRONIZATION of Digital Facilities Availability of Synchronization SourcesMisconception Fact ISDN-PRI Trunk Facilities ANN35 or TN767 with TN755 Line-Only Mode DS1/DMI-BOS ANN11 or TN767Conclusions on Synchronization USE of Generic 2 AS a System Clock Reference Trunk-Mode ISDN-PRI TN767 Line+Trunk Mode DS1/DMI-BOS ANN35 or TN767 with TN555DMI-MOS ANN35 or TN767 with TN755 USE of Generic 1 AS a System Clock Reference Trunk-Mode DS1/DMI-MOS TN767 Line-Only Mode DS1/DMI-BOS TN767 32SYNCHRONIZATION of Digital Facilities Port TYPES/INSTALLATION Compatibilities FX, Wats 2PORT TYPES/INSTALLATION CompatibilitiesDMI-BOS E Port TYPES/INSTALLATION Compatibilities Supported Port Types Operating Mode4PORT TYPES/INSTALLATION Compatibilities Generic 1 DS1/DMI-BOS System 85 DS1, Traditional Modules ANN11 Line-Only ModeDMI Trunks Generic 1 ISDN-PRI 6PORT TYPES/INSTALLATION Compatibilities Line+Trunk Mode Port TYPES/INSTALLATION Compatibilities Others OPS Other Circuit Packs OPS PORTS/CARRIER Slot Port TYPES/INSTALLATION Compatibilities Carrier Slots P T Y 10PORT TYPES/INSTALLATION Compatibilities Line+Trunk Mode Port Grouping Rules Did Trunk DMI-BOS TrunksGround-Start CO Trunk Transparent Ports 12PORT TYPES/INSTALLATION CompatibilitiesLoop-Start CO Trunk Of-Premises Stations System 85 DS1 or DMI-MOS, Traditional Modules ANN35 Port Grouping Rules 14PORT TYPES/INSTALLATION Compatibilities Administration Options and Requirements 2ADMINISTRATION Options and Requirements Field Procedure 275 Word 4 Isdn Service Enable/DisableAdministration Options and Requirements System System 85 R2V1 Through R2V4 Display only Procedure 276 Word 1 Other Feature GroupsProcedure 250 Word 1 DS1 Carrier Designation 4ADMINISTRATION Options and Requirements System Position V1-V4Module Control Procedure 260 Word 1 DS1/DMI/ISDN-PRI Physical Interface Slot numbers 0, 5, 13, or 18 for line-only operation Service or Facility OptionsCan be assigned V1-V2 V3-V4 Voice/data AVD 10ADMINISTRATION Options and Requirements System Criteria for Switching Back to the Primary Facility Criteria for Switching to the Secondary Facility 12ADMINISTRATION Options and Requirements System DS1/OPS Related Translations DS1 Channel Slot/Circuit 14ADMINISTRATION Options and Requirements System V4 Only DS1/DMI-BOS applications should be administered with aSupported. Therefore, option one is not applicable PRI Parameters Procedure 262 Word 1 Isdn Board Parameters16ADMINISTRATION Options and Requirements System Fields Field Procedure 354 Word 3 NPA-NXX Digits Assignment Enhanced Mode Procedure 354, Word NPA-NXX Assignment Procedure 000 Word 4 NPA-NXX Index Designator 20ADMINISTRATION Options and Requirements System Range of 1 through 22ADMINISTRATION Options and Requirements System Field Enhanced Mode Procedure 100, Word Trunk Group Translation 24ADMINISTRATION Options and Requirements SystemDial Access CODE/TRUNK ID Code Wats Trunk Description TypeDid Isdn TIE Administration Options and REQUIREMENT’S System Procedure 100 Word 2 Trunk Group Data Translations Sychronous Duplex Procedure 100 Word 3 Isdn Trunk Group Signaling OptionsModem Pooling Data Rate 28ADMINISTRATION Options and Requirements System Field Isdn network features is desired Field 1 Field Fields Fields 9-11 Field 32ADMINISTRATION Options and Requirements System 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 38ADMINISTRATION Options and Requirements System Procedure 012 Word 1 Name Database Through 99999, for extension and directory numbers Procedure 012 Word 2 Name Database Enhanced Mode Procedure 012, Word Name Database Entry Procedure 012 Word 3 Name DatabaseCharater Encodes Enhanced Mode Procedure 012, Word Name Database Compaction 42ADMINISTRATION Options and Requirements System IXC Isdn Enhanced Mode Procedure 309, Word ARS Route Tables Bearer Capability 44ADMINISTRATION Options and Requirements System Isdn Network Service/Feature Options, shows the relationshipsNetwork Service or Network Feature Value Trunk Type 46ADMINISTRATION Options and Requirements System AAR System 85 R2V4, depicts the procedureEnhanced Mode Procedure 321, Word AAR Route Tables Bearer Capability TNS Procedure Word FieldNSF IXC NSF TTL Telephone Digits 23. Procedure Terminating Test Line Telephone Digits Attendant Release Loop Operation Administration Options and Requirements GenericMaximum Preemption Level Administrable Alarms Generic SNC 52ADMINISTRATION Options and Requirements Generic Procedure 250 Word 1 SC/DS1 Carrier Designation Field Fields 54ADMINISTRATION Options and Requirements Generic SC Information Connected to CC0 ON-LINE Enter command ISDN-PRI Equipment Traditional Universal Parameter Module 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 133 to 90 to 266 to 180 to 399 to 270 to 532 to 360 to Distance to Midpoint Compensation Or Endpoint FT PRI and BRI Layer 2 Parameters BRI Only Depending on the particular facility NFAS-PRI Only Procedure 262 Word 2 ISDN-PRI D-Channel Backup Backup Channel Equipment Location 68ADMINISTRATION Options and Requirements GenericPrimary D-CHANNEL Equipment Location Procedure 262 Word 3 ISDN-PRI Codeset Map Assignments Performance Mapped from CODESET/INFORMATION Element Enhanced Mode Procedure 280, Word Isdn Codeset MappingMapped to CODESET/INFORMATION Element Field Field 6 Field IE Name Codeset NPA Enhanced Mode Procedure 354, WordNXX 74ADMINISTRATION Options and Requirements Generic 34.Procedure 000 Word 4 NPA-NXX Index Designator LDN Enhanced Mode Procedure 210, WordNPA-NXX Differences Between System 85 R2V4 and Generic Procedure 014 Word 1 Bccos Routing Options Call Types and Action Taken COS Default Capabilities 78ADMINISTRATION Options and Requirements Generic Procedure 014 Word 2 Bccos Data Options Or is not 0 supported 80ADMINISTRATION Options and Requirements Generic 38.Procedure 010 Word 4 Terminal COS Restrictions Generic Field Enhanced Mode Procedure 100, Word 82ADMINISTRATION Options and Requirements Generic Isdn DMI 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 Channel Versus Trunk Assignments 92ADMINISTRATION Options and Requirements Generic DS1 Channel Slot/Circuit 94ADMINISTRATION Options and Requirements Generic 45.Procedure 012 Word 1 Name Database Generic From 1 to Character Encodes 96ADMINISTRATION Options and Requirements Generic 47.Procedure 012 Word 3 Name Database Generic Field Parameters 98ADMINISTRATION Options and Requirements GenericEnhanced Mode Procedure 279, Word NETWORK-SPECIFIC Facility Isdn Network Definition Coding Value Binary Network Parameterized Feature Facility11. Network Name 100ADMINISTRATION Options and Requirements Generic Procedure 309 Word 1 ARS Route Tables Enhanced Mode Procedure 309, Word Procedure 309 Word 5 ARS-ISDN Bccos Procedure 321 Word 1 AAR Tables Generic Services/Network Features, for the appropriate encode102ADMINISTRATION Options and Requirements Generic Enhanced Mode Procedure 321, Word 104ADMINISTRATION Options and Requirements Generic Procedure 321 Word 5 AAR-ISDN and Other Feature Parameters 53.Procedure 107 Word 1 Atms TTL Assignment System 85 R2V4 106ADMINISTRATION Options and Requirements Generic Procedure 108 Word 1 Isdn Trunk Group TTL Number Digits DS1 Circuit Pack Service/Facility OptionsDMI-BOS? Maintenance Parameters System 75 R1V2 and R1V3 Compensation Value Distance Feet 108ADMINISTRATION Options and Requirements System 109 Loop SlipDetection Remote DS1 Circuit Packs Synchronization Plan Trunk Group/Trunk Group Members 112ADMINISTRATION Options and Requirements System Mode DelayPort Name Call 114ADMINISTRATION Options and Requirements SystemACA AAR/ARS 116ADMINISTRATION Options and Requirements Generic 60.DS1 Circuit Pack Screen, Common-Channel Signaling Line Location 118ADINISTRATION Options and Requirements Generic Interface 120ADMINISTRATION Options and Requirements Generic DTT Trunk Group/Trunk Group Members DS1 Trunk ApplicationsCall COR STT In/out 122ADMINISTRATION Options and Requirements GenericBCC Avd or data PBX ID Trunk Group ACA Night With auto ModeProcessor Interface Data Module ISDN-PRI Applications Processor Channel Assignments ISDN-PRI Applications Data ExtensionPhysical Channel Chan Priority Proc ChanAppl Link DTE/DCE Trunking Considerations ISDN-PRI Applications 128ADMINISTRATION Options and Requirements GenericAdvantages of CBC Trunking NETWORK-FACILITIES FeatureEither a feature 0, or service Network Facilities ISDN-PRI Applications Trunk Group ISDN-PRI Trunk Applications CodingCOR TAC Options access, tie Dial AccessService Service Type Message Size SendDisplay/TCM Max SID? Trunk FeaturesSID/ANI 134ADMINISTRATION Options and Requirements Generic Application Example #1 DelApplication Example #2 Case InsertPer Call SID/ANI Application for Case 2 being selected Application for Case 1 being selected most restrictiveApplication for Case 3 being selected Application for Case 4 being selected 138ADMINISTRATION Options and Requirements Generic PBX Applications for CasesExample Screen Entries for Cases Trunk Group Usage Allocation ISDN-PRI Applications Plan 140ADMINISTRATION Options and Requirements GenericUsage Allocation An Example Application for Usage Allocation Plans Min# Chan Max# Chan CBC Trunk Group Usage Allocation Plan Assignment Schedule 142ADMINISTRATION Options and Requirements GenericFixed Number Scheduled 75.Trunk Group Screen, Page 5 ISDN-PRI Trunk Group Member Assignments ISDN-PRI Trunk Applications SID Prefix 144ADMINISTRATION Options and Requirements GenericName Night SID Prefix Table ISDN-PRI Applications SID Prefix Ext CodeAn Example Application that uses SID Routing Patterns ISDN-PRI Applications 146ADMINISTRATION Options and Requirements Generic FRL PatternNumber Grp No Inserted 148ADMINISTRATION Options and Requirements GenericNo. Del Digits Hunt Group ISDN-PRI Applications Band ACD? 150ADMINISTRATION Options and Requirements GenericTerminating Extension Group ISDN-PRI Applications Hunt Group Terminating Extension Group 152ADMINISTRATION Options and Requirements Generic Generic 2 Maintenance Capabilities and Concerns Generic 1 and Generic 2 ISDN-PRI Maintenance Philosophy 2MAINTENANCE and Alarms Generic 2 Maintenance Procedures Maintenance and Alarms 4MAINTENANCE and Alarms Summary of Generic 2 Maintenance Capabilities Generic 1 Maintenance Procedures Generic 1 Maintenance Capabilities and Concerns6MAINTENANCE and Alarms Yellow LED Summary of Generic 1 Maintenance CapabilitiesAlarms Circuit Pack Alarms 8MAINTENANCE and Alarms Facility AlarmsExcessive Misframe and CRC Errors LFA Alarm Loss of Signal Alarm Remote Frame Alarm 10MAINTENANCE and Alarms Blue AlarmMajor and Minor Alarms Framing Mode Alarm Type Conversion Administration Requirements Megacom COR 2ADMINISTRATION RequirementsPBX ID ACA Administration Requirements 4ADMINISTRATION Requirements DCS? PBX ID Figure A-5.Trunk Group Screen, Page 1 SDN Facilities, for details 6ADMINISTRATION Requirements Dacs TRANSLATIONS-BASED Problems Transmission Facility 2SAMPLE Installation and Maintenance Problems Trunks and Trunk Groups Sample Installation and Maintenance Problems Type 4SAMPLE Installation and Maintenance Problems DS1 or DMI CDMsCEMs System 6SAMPLE Installation and Maintenance Problems D4-Channel Banks Sample Installation Maintenance Problems 8SAMPLE Installation and Maintenance Problems SYNCHRONIZATION-RELATED Problems Leavenworth Loop Loss of or No Synchronization Figure B-10.Leavenworth Loop on the Primary Reference D4 Synchronization Problems Sample Installation and Maintenance Problems 12SAMPLE Installation and Maintenance Problems Digital CO Synchronization ProblemsDacs Figure B-15.Synchronization from Dacs Node Typical Physical Interface Connection Problems Initial System 85 DS1 or DMI Pinout for 50-PIN Connector 14SAMPLE Installation and Maintenance Problems System Intracabinet Installation Maintenance ProblemsCABLE/CONNECTORS Initial or OLD PDS Compatible System C6C To WIRE-LUGS 16SAMPLE Installation and Maintenance Problems Specific Cabling Options Permitted Cabling Combinations 18SAMPLE Installation and Maintenance Problems Using cable GR-380 Permitted Cabling Combinations Using PDS 20SAMPLE Installation and Maintenance Problems Permitted Cabling Combinations Using PDS 22SAMPLE Installation and Maintenance Problems Voice Procedure 000 Word 3 Generic 2 Only 2ADMINISTRATIVE Procedure Summary Mode Voice Grade Data Unknown Digital Analog Mode 3/2 Isdn Routing Parameters System 85 R2V4 & Generic Procedure 000 Word 4 System 85 R2V4 & GenericProcedure 010 Word 4 System 85 R2V4 & Generic Administrative Procedure Summary BC System 85 R2V4 Only 4ADMINISTRATIVE Procedure SummaryVoice or Voice Grade Data Procedure 100 Word 1 System 85 R2V4 & Generic Procedure 012 System 85 R2V4 & Generic 6ADMINSTRATIVE Procedure Summary Procedure 100 Word 2 Generic 2 OnlyRules for Trunk Type 120 System 85 R2V4 & Generic Procedure Procedure 100 Word 3 System 85 R2V4 & GenericTCM For international calls that is, a dial Calls For ARS calls Procedure 107 Word 1 System 85 R2V4 & Generic8ADMINISTRATIVE Procedure Summary Called-Party Number IE System 85 R2V4 & Generic Procedure 260 Word 1 System 85 R2V4 & Generic Procedure 108 Word 1 System 85 R2V4 & GenericProcedure 116 Word 1 System 85 R2V4 & Generic Procedure 210 Word 2 System 85 R2V4 & Generic 10ADMINISTRATIVE Procedure Summary Procedure 280 Word 1 Generic 2 Only Procedure 262 Word 3 Generic 2 OnlyProcedure 275 Word 4 System 85 R2V4 & Generic Procedure 279 Word 1 Generic 2 Only Information Element IE Name Opcode Value 12ADMINISTRATIVE Procedure SummaryIE Opcode Value Information Element IE Name R2V4 Field 5, Network Service Value Procedure 309 Word 5 System 85 R2V4 & GenericField 4, Isdn Trunk Type Megacom NSF 14ADMINISTRATIVE Procedure SummaryNSF IE System 85 R2V4 Through 288 Outwats Band NSFs SDN NSF NSF IE Generic Wats NSF Accunet via encode BC System 85 R2V4 and Generic 16ADMINISTRATIVE Procedure SummaryFields 6-10 System 85 R2V4 Procedure 354 Word 3 System 85 R2V4 & Generic Procedure 321 Word 5 System 85 R2V4 & GenericField 6 Generic 18ADMINISTRATIVE Procedure Summary Procedure 420 System 85 R2V4 & Generic Administrative Procedure Summary 20ADMINISTRATIVE Procedure Summary Trunk/Signaling Cross-references Trunk Type and Signaling Type Compatibility Tables Aplt 2TRUNK Type and Signaling Type Compatibility Tables TIE Trunk Type and Signaling Type Compatibility TablesWats Did MAIN/SAT CAS ISDN/PRI NDM-I R2V4 G2 Equiv Type Sig. Type 6TRUNK Type and Signaling Type Compatibility TablesTrunk EQU Trunk Type and Signaling Type Compatibility Tables ANN11 8TRUNK Type and Signaling Type Compatibility Tables S BC BCC Bccos bps AAR F T C Afrl Aiod ALU ANI ARS Autovon AVD AWGCBC Ccitt CCR Ccsa CDM CEM COR COS CRC CSU AB-2ABBREVIATIONS Dacs dB Abbreviations AB-3 AB-4ABBREVIATIONS Adftc Afrl Aiod AccunetMegacom Tandem Data transmissionGL-2GLOSSARY B8ZS AWG Ports, packet switching, Binary serviceParameterized service format Bit error rate Burstiness Glossary GL-5 See network channel-terminating equipment See cyclic redundancy check Cross couplingUnrestricted digital data Q.931 DTE Dnis DMI-MOSDS1 Epscs GL-9EIA ETN Hdlc GRS Inads GL-12GLOSSARY See Integrated Services Digital NetworkIsdn network- See Isdn network identifier. service value Clock reference See loss of frame alignment Loss of signalIsdn SID-ANI Lata LFA Station identification number Ncte Mpdm Glossary GL-15 OPS OPXDigital Network primary rate interface Network primary rate interface PRI PADPAM PC/PBX PCM PDM PDS PCM PAM See Software Defined Network Robbed-bit signalingSee remote frame alarm See Remote Group SDN SS7 Transport mode Switch TMSMultiplexed switch See time-multiplexed switch ZCS Zero code Adftc Network 7-84,7-88nodal servicesAccunet 6-3,C-16code Equal 7-43,7-47,7-101,7-103ISDN Violation 1-18,1-20,3-3 AVD 1-22,7-9BC 1-22,C-16 BC code 7-23,7-81 Bccos 1-24,C-1 9delta CcittCEM 9bank D4 1-1,2-5D-type1-1 CRC 1-12,1-14CRV CSU xix, 1-20,3-2customer COR 7-112,7-125,A-2DCE 1-21,7-127D-channel Index IN-5 NPA-NXX7-28,7-72BOS I -Contd BOS-Contd EIA IN-6 IndexDS1- Contd DTE 2-18 FXS D4 1-10,2-5,2-7Index IN-7 Lapd 1-3,7-17LATA 2-7layer 1 1-3layer 2 IN-8 IndexLEC Index IN-9 Misframe 1-11,1-14MOVoice 1-23,7-33voice-grade data 1-23,1-24ZCS CDM Ncte IN-10 IndexNPA-NNX C-17 Channel1-5,1-9,7-57facility 7-11,7-59 OPSPorts 4-7,6-6 PCM 1-8,5-1PCM data RNX 1-27robbed-bit signaling 9sources SS7 7-30,7-88Index IN-13 CEM 2-10terminating IN-14 IndexTMS 108 CO 2-8,7-13combination tie 2-5,6-4DID 6-11,7-13FX 2-8,7-13ground-start CO 6-11group Members 7-35,7-92Generic 1 IN-16 Index