12Cisco BPX 8600 Series Reference | Cisco Systems manual

ATM Service Interface (ASI-2, LM-OC3)

A-12Cisco BPX 8600 Series Reference

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Cisco Systems manual 12Cisco BPX 8600 Series Reference

Contents

Cisco BPX 8600 Series Reference Release MayPage Page Page About This Manual Chapter Introduction BPX Switch Common Core Chapter General Description Chapter Service Interface Line Cards Chapter Network Interface Trunk Cards Simba BXM T3/E3, 155, Chapter ATM Connections Chapter Tag Switching Chapter ATM and Frame Relay SVCs SPVCs Chapter BME Multicasting Chapter Repair and Replacement 11-1 Chapter Frame Relay to ATM Network Service Interworking 12-1 Chapter Tiered Networks 13-1 Chapter BPX Snmp Agent 14-1 Appendix B BPX Switch Cabling Summary Appendix a BPX Node SpecificationsAppendix C BPX Switch Peripherals Appendix D AT3-6ME Interface Adapter Appendix E Glossary Index F I G U R E S Xviii Cisco BPX 8600 Series Reference List of Figures Dial-Modem Cabling for Auto Answer Dial-In to BPX T a B L E S Table B-2 Table A-1Table B-1 Table B-3 Table C-3 Table C-1Table C-2 Table C-4 Xxiv Cisco BPX 8600 Series Reference Objectives Cisco WAN Switching Product Name ChangeAbout This Manual Audience Organization Chapter Frame Relay to ATM Network and Service Interworking Chapter Tag SwitchingChapter Repair and Replacement Appendix a BPX Node Specifications Conventions Related DocumentationRelated Documentation Conventions Xxx Cisco BPX 8600 Series Reference General Description IntroductionBPX Capabilities Extended Services Processor General Description BPX Switch General Configuration Example MGX IGX Switch Continuing Features with ReleaseBPX Switch New with Release Continuing Features with Release Network IMATM-B BPX Switch Operation BPX Switch OperationAccess Products BPX Switch Operation BPX Switch with Extended Services Processor BPX Switch with MGX 8220 ShelvesTag Switching Frame Relay to ATM Interworking Frame Relay to ATM Network Interworking Tiered Networks Service InterworkingAdditional Information Routing Hubs and Interface Shelves BPX Switch Routing Hubs Tiered Network with BPX Switch and IGX Switch Routing Hubs Inverse Multiplexing ATM Virtual Trunking Virtual Trunking Example FairShare Traffic and Congestion ManagementTraffic and Congestion Management AutoRoute OptiClassCost-Based AutoRoute Congestion Management, VS/VD Congestion Management, ForeSight Network Interfaces Network ManagementNetwork Management Statistical Alarms and Network Statistics Service InterfacesNode Synchronization Switch Software Description Switch Software DescriptionConnections and Connection Routing Connection Routing Groups Major Features of Cost-Based AutoRoute Cost-Based Connection Routing 22Cisco BPX 8600 Series Reference Network Synchronization Cost-Based AutoRoute CommandsNetwork Synchronization Switch Availability Switch AvailabilityNode Alarms Node Redundancy Switch Availability 26Cisco BPX 8600 Series Reference General Description BPX Switch EnclosurePhysical Description BPX Switch Exterior Front View Physical Description Node DC Powering Node Cooling Optional AC Power Supply Assembly DC Power Entry Module Shown with Conduit Box Removed Card Shelf Configuration AC Power Supply Assembly Front View BPX Switch Card Shelf Front View ATM Layer Functional DescriptionPhysical Layer Functional Description ATM Cell Headers ATM Cell Format Functional Description UNI Header NNI Header STI Header Functional Description STI Header AAL ATM Cell AddressingATM Adaptation Layer Smds IPX and IGX Switch Trunk Interfaces to ATM 11 SAR Adaptation Process BAM CAM UNI FastPacket Adaptation to ATMSTI SAM UNI Complex Gateway, Frame Relay to ATM Network Interworking Simple GatewaySimple and Complex Gateway Formats BPX Switch Major Groups BPX Switch Major GroupsBPX Switch Plug-In Card Summary Card Name Where LM-2OC3-SMF BMESmfxlr LM-2OC3-SMFLR Optional Peripherals Optional Peripherals BPX Switch Common Core BPX Switch Common Core Group Broadband Controller Card BCC-32, BCC-3, BCC-4 Common Core Group Block DiagramBroadband Controller Card BCC-32, BCC-3, BCC-4 Features Functional Description BCC-32 and BCC-3 Block Diagram Front Panel Description BCC Front Panel IndicatorsIndicator Function LAN Card BCC Front Panel Enter y Gbps Operation with the BCC-4Back Cards for the BCC-3 and BCC-32 Step Backcard Line Module for BCC-32, Connectors Connector Function EXT 1 TMG EXT 2 TMG BCC-3-bc or BCC-c Face Plate Connectors Alarm/Status Monitor Card Alarm/Status Monitor Card ASM Front Panel Controls and Indicators Controls Indicator Function Status ACO LM-ASM Face Plate Connectors Line Module for the Alarm/Status Monitor CardConnector Indicator Function LMI-ASM Face Plate BPX Switch StrataBus 9.6 and 19.2 Gbps Backplanes BPX Switch StrataBus 9.6 and 19.2 Gbps Backplanes 18Cisco BPX 8600 Series Reference BXM Cards, Trunk Mode Summary BPX Switch Network Interface GroupNetwork Interface Trunk Cards Broadband Network Interface Cards BNI-T3 and BNI-E3 Broadband Network Interface Cards BNI-T3 and BNI-E3 Egress Simplified BNI-T3, BNI-E3 Block Diagram Ingress Bandwidth Control BNI Front Panel Status Indicators Front Panel IndicatorsLoopbacks and Diagnostics Status LED color Status Description Status port Port 1 RX TX LM-3T3 and LM-3E3 ConnectorsT3 and E3 Line Modules LM-3T3 and LM-3E3 Port 2 RX TX T3 and E3 Line Modules LM-3T3 and LM-3E3 LM-3T3 Face Plate, Typical LM-3E3 Face Plate, Typica Egress Broadband Network Interface Cards, BNI-155Overview Ingress CBR VBR Simplified BNI-155 Block Diagram Act Stby Fail Failure Description 7BNI-155 Front Panel OC3, Line Modules SMF, SMFLR, & MMF LM-OC3-SMF and LM-OC3-SMFLR Connectors FunctionLM-OC3-MMF Connectors Function OC3, Line Modules SMF, SMFLR, & MMF LM-2OC3-SMF Face Plate LM-2OC3-MMF Face Plate Cabling of BNI Backcard, SMF-2-BC Cabling of BNI Backcard, SMF-2-BC 20Cisco BPX 8600 Series Reference BPX Switch Service Interface Group Summary Service Interface Line CardsBXM Cards, Port UNI Mode Summary ASI-1, ATM Service Interface Card ASI-1, ATM Service Interface Card Egress Configuring Connections ATM over ASI Example Monitoring Statistics 6Cisco BPX 8600 Series Reference ASI-1 Front Panel LM-2T3 Module LM-2T3 Module Line Module, ASI, 2T3 LM-2E3 Module LM-2E3 Module Line Module, ASI, 2E3 ASI-155, ATM Service Interface Card ASI-155, ATM Service Interface Card Configuring Connections ASI-155 Simplified Block Diagram Service Interface Line Cards ASI-155 Front Panel ASI-155 Line Module, LM-2OC3-SMFLR BXM Cards, Access UNI ModeASI-155 Line Module, LM-2OC3-SMF ASI-155 Line Module, LM-2OC3-MMF BXM Cards, Access UNI Mode Tag Switching BXM T3/E3, 155, BXM Cards Dynamic Resource Partitioning for SPVCsDynamic Resource Partitioning for SPVCs BXM Cards OC12/STM-4 622.08 Mbps T3/E3 45 Mbps/34MbpsOC3/STM-1 155.52 Mbps BPX-T3/E3-BC T3/E3 45 Mbps/34 Mbps FeaturesBXM Capabilities OC3/STM-1 155.520 Mbps ATM Layer BXM Capabilities VBR Service Service TypesCBR Service ABR Service BXM Front Panel Card Failure indicators BXM Front Card IndicatorsBXM Front Panel Status Indicators Card Operation Card BXM-155 Front Panel, Eight-Port Card Shown BXM-T3/E3 Front Panel, 12-Port Card Shown BXM-155 Backcards BXM, Backcard ConnectorsBXM-622 Backcards BXM-T3/E3 Backcards SMF-622-2, SMFLR-622-2, and SMFXLR-622-2 Back Card BXM-155-8 Port Backcard, MMF, SMF, or Smflr BPX-T3/E3 Back Card, 12-Port Option Shown Cabling of SMF-622 Series Backcards Y-Cabling of SMF-622 Series Backcards BXM Functional Description Overview, Port UNI ModeBXM Functional Description BXM Port Access UNI Ingress Operation 10 BXM Port Access, UNI Egress Operation Overview, Trunk Mode BXM Trunk Ingress Operation BXM Trunk Egress Operation Detailed Description, Port UNI and Trunk Modes DeMux/Mux Ingress and Egress Queue Engines ACP Subsystem Processor Alarms Fault Management and StatisticsFault Management and Statistics, Port UNI Mode Performance Monitoring Fault Management and Statistics, Trunk Mode Physical Layer Technical SpecificationsTechnical Specifications General Information Sonet Section, Line, and Path Descriptions General Sonet NotesGeneral Sonet Notes Unit Description Connection Provisioning User CommandsDiagnostics Test Configuring Connections Configuring ConnectionsConfiguration Management Syntax Configuring Connections Field Value Description Command Line Interface Examples Command Line Interface Examples An example of the addtrk command follows An example of the cnfln command follows An example of the cnfportq command follows An example of the upport command follows An example of the cnfcls command for class 2 follows YourID1 BPX Jan 1998 0241 GMT An example of the cnfabrparm command follows An example of the dsplns command follows 40Cisco BPX 8600 Series Reference Summary Resource PartitioningDynamic Resource Partitioning for SPVCs Resource Partitioning ASI SVC Resource Partitioning Shown in the following example Example ASI cnfportq Command Example BXM cnfport Command BXM SVC Resource Partitioning NNI Trunk SVC Resource Partitioning BNI Trunk SVC Resource Partitioning TS,NTS,FR,FST,CBR,VBR,ABR Example BNI cnftrkparm Command BXM Trunk SVC Resource Partitioning Example BXM cnftrk Command ATM Connection Services ATM Connections SVCs SVCs QoS Parameters Traffic Management OverviewTraffic Parameters Other Attributes Vsvd Description Standard ABR notesBXM Connections ForeSight Congestion Control ATM Connection RequirementsATM Connection Requirements Connection Routing Addcon Command SyntaxField Value Description ATM Connection Configuration ATM Connection Configuration CLP0+1 SCR Flow Default Setting OC12 Range ASI T3/E3 Range ASI-155 Range BXM T3/E3, OC3 RIF ICRRDF Vsvd PCRCdvt SCR IBS CBR Connections CBR Policing Definitions ATM Forum TM Spec PCR Flow VBR and Atfr Connections VBR Connections Atfr Connections Atfr Connection Prompt Sequence ABR and Atfst Connections ABR NotesABR Connections ABR Standard Connection Prompt Sequence Meaning of Vsvd and Flow Control External Segments Atfst Connections ABR ForeSight Connection Prompt Sequence Atfst Connection Prompt Sequence UBR Connections UBR Policing Definitions ATM Forum TM Spec PCR Flow CBR Traffic Policing Examples Traffic Policing ExamplesDual-Leaky Bucket An Analogy Traffic Policing Examples 11 CBR Connection, UPC Overview LP=1 12 CBR.1 Connection with Bucket Compliant VBR Dual-Leaky Bucket Policing Examples VBR.1 14 VBR Connection, UPC Overview Leaky Bucket Examples 15 VBR Connection, Policing = 4, Leaky Bucket 1 Compliant CLP=0 VBR.2 LP=0 18 VBR.2 Connection, Leaky Bucket 2 Discarding CLP 0 Cells VBR.1 VBR.3 ABR Connection Policing UBR Connection Policing 21 UBR Connection, UPC Overview Traffic Shaping for CBR, VBR, and UBR ConfigurationTraffic Shaping for CBR, VBR, and UBR LMI and Ilmi Parameters Traffic Shaping Rates ATM and Frame Relay SVCs, and SPVCs ATM and Frame Relay SVCs and SPVCs SPVCs PVCs and SVCsPVCs ATM and Frame Relay SVCs and SPVCs SVCs Interim Inter-switch Protocol Routing BPX Switch and ESP InterfacesBPX Switch and ESP Interfaces UNI Signaling Channel Signaling PlaneSignaling Plane NNI Signaling Channel UNI Signaling Channels Network Interworking Between Frame Relay and ATM Network Interworking Between Frame Relay and ATM Extended Services Processor Extended Services ProcessorESP Interfaces Stand-Alone ESP Redundant ESPs Cable Redundancy ESP Y-Cable Redundancy Other Redundancy Options Resource Partitioning Tag Switching Introduction Tag Switching Overview Tag Switching BenefitsTag Switching Benefits Elements in a Tag Switching Network Elements in a Tag Switching NetworkTag Switching Operation at Layer Forwarding Tag Switching in an ATM WAN Tag Switching in an ATM WANControl Tag Forwarding Information Base Tfib in an ATM Environment Downstream on Demand Tag Allocation, Conservative Mode Shown Tag Switching and the BPX Tag Switching and the BPX BPX Tag Switching Virtual Switch Interfaces BPX Switch VSI Interfaces Connection Setup, End Points on same VSI Slave Tag Switching Resource Configuration Parameters Tag Switching Resource Configuration Parameters Configuring VSI Lcns Useful Default Allocations Details of More Rigorous Allocations Port VSI Partition LCN Allocation Elements List of Terms RequirementsRequirements Related Documents Configuration ManagementRelated Documents Cnfrsrc Command Configuration CriteriaCnfqbin Command Configuration Criteria Cnfrsrc Parameter Summary Example Parameter cnfrsrc Value Description Configuration Example Configuration ExampleResetcd 4 h Dspcds Status Active Revision CD18 Cnfrsrc Max PVC bandwidth Partition Enabled e VSI min LCNsUptrk 4.1 uptrk 4.2 uptrk VSI start VPI VSI end VPI VSI min b/w VSI max b/w 22Cisco BPX 8600 Series Reference Dspqbin 4.1 Cnfqbin 4.1 Enable/disable eCnfqbin 4.1 10 e 0 65536 95 100 Addshelf 4.1 vsi 1 Checking and Troubleshooting Checking and TroubleshootingTsc# show controllers VSI descriptor Dsptrks Dspnode Dsprsrc 4.1 Tsc# reload Tsc# show tag intTsc# sho tag tdp disc Statistics Provisioning and Managing ConnectionsProvisioning and Managing Connections TSC Commands Command ReferenceBPX Switch Commands Command Reference Syntax Related CommandsAddshelf Attributes Description for Tag Switching Example for Tag Switching Example for Interface Shelves Description for Interface ShelvesAddshelf 11.1 a Cnfqbin Related Commands dspqbin Parameters-cnfqbinBPX switch Example Description Cnfqbin 4.1 10 e 0 65536 95 100 Cnfrsrc Related Commands Parameters-cnfrsrcParameter cnfrsrc Description Cnfrsrc Parameter cnfrsrc Description Here, ax = 256, n1x = 512, and m1x = 10 Port VSI Partition LCN Allocation Elements Example 1, 8-Port OC3 BXM Configured in Trunk Mode Cnfrsrc Port VSI Partition = Total Lcns available toPort N1x Unallocated Min z1 + n1x, max M1x LCNs Example 2, 8-Port OC3 BXM Configured in Port Mode 44Cisco BPX 8600 Series Reference 120 3000 3500 4907 7588 100 Parameters-dspcd IPX switch, IGX switch, BPX switchDspcd Dspcd Syntax dspcds l Example dspcds DspcdsParameters-dspcds Dspcds KDJ Dspnode BPX switch, IGX switch YesDspnode 50Cisco BPX 8600 Series Reference Example dspqbin 4.1 Related Commands cnfqbin Parameters-dspqbinDspqbin Dspqbin Example dspqbin 4.1 10 Sample Display Example dsprsrc 4.1 Related Commands cnfrsrc Parameters-dspcdsDsprsrc Dsprsrc Dsptrks Dsptrks Example Yes IPX switch, IGX switch, BPX switch ResetcdExample resetcd 5 H Resetcd Example upport Yes BPX switchUpport Upport System Response Optional Parameters-uptrk UptrkParameters-uptrk Example uptrk Uptrk BME Multicasting Multicasting Benefits BME FeaturesStandards Multicasting Overview BME Restrictions Connection Management CriteriaConnection Management with Cisco StrataView Plus Address Criteria BME Cell Replication BME OperationBME Operation Adding Connections Group Action CommandCell Replication Stats Group Multi-Segment Multicast Connections Multicast Statistics Policing AlarmsAlarms OAM cells Hot Standby Backup Hot Standby BackupAIS cells Connection Diagnostics ConfigurationConfiguration Configuration Management Troubleshooting the BPX Switch Repair and ReplacementPreventive Maintenance General Troubleshooting Procedures Troubleshooting the BPX Switch Troubleshooting the BPX Switch Symptom Probable Cause Remedy Symptom Probable Cause Remedy Card Type Status Description Card Status for the BPX SwitchDisplaying the Status of Cards in the Node BCC Replacing Parts Replacing PartsReplacing a Front Card Replacing Parts Step Top of the grille should pop out Replacing a Line Module Unlatching the Air Intake Grille 11-8Cisco BPX 8600 Series Reference Replacing a DC Power Entry Module Removing a Line Module DC Power Entry Module with Conduit Box Replacing an AC Power Supply AC Power Supply Assembly Field-Installing a Second AC Power Supply Removing Blank Filler Panel B side shown Replacing the Fan Assembly Replacing the Temperature Sensing Unit Replacing Card Slot and Fan Fuses on the System Backplane Card Slot and Fan Fuse Locations on System Backplane 11-16Cisco BPX 8600 Series Reference Frame Relay to ATM Network and Service Interworking Frame Relay to ATM Network and Service Interworking 12-2Cisco BPX 8600 Series Reference Service Interworking Networking Interworking Networking Interworking MUX FRP BUS AIT BNI ATF Connections, Simplified Example ATM Protocol Stack ATM Protocol StackATM Layers AIT/BTM Interworking and the ATM Protocol Stack AIT/BTM Interworking and the ATM Protocol Stack Protocol Stack Operation AIT/BTM Control Mapping, Frames and Cells ATF Summary FeaturesManagement, OAM Cells Limitations Port Management Some ATF Connection CriteriaConnection Management Addcon Cnfcls Cnfcon Delcon Dspcls Dspcon Dspcons Cnfport Cnfportq Channel StatisticsStructure Clrchstats Cnfchstats Dspchstats Dspchstatcnf Dspchstathist OAM Cell Support DiagnosticsDspalms Dspcon Dspport Tstconseg Tstdly Virtual Circuit Features User Commands Management AUser CommandsManagement Bandwidth Management RoutingUser Interface Signaling Alarms Routing Hubs and Interface Shelves Tiered NetworksBPX and IGX Routing Hubs Routing Hubs and Interface Shelves Tiered Network with BPX and IGX Routing Hubs Tiered Network Implementation BPX Routing Hubs in a Tiered NetworkBPX Routing Hubs in a Tiered Network General UpgradesDefinitions Co-locating Routing Hubs and Interface Shelves Network Management Preferred Routing IPX Interface Shelf DescriptionForeSight Local and Remote Loopbacks Alarm Management of Interface Shelf on the BPX Hub Node Configuration and ManagementInterface Shelf Management Connection Management Alarm Management on the IPX Interface ShelfPort Management Bandwidth Management IGX Routing Hubs in a Tiered Network IGX Routing Hubs in a Tiered Network IGX Shelves and Routing Hubs, Frame Relay Connections General Co-locating Routing Hubs and Shelves IGX Interface Shelf Description Shelf Management Alarm Management on the IGX Interface Shelf User Interface CommandsAlarm Management of Interface Shelf on the IGX Hub Node Shelf Voice Connection Commands Data Connection CommandsData Channel Commands Voice Channel Commands Cisco StrataView Plus NMS Cisco StrataView Plus NMS 13-18Cisco BPX 8600 Series Reference BPX Snmp Agent Snmp Overview 1shows an Snmp manager and the nodes within a domain Snmp Overview Snmp Functions Snmp Functions Responses to Get Get-Next Requests ATM Set Requests Responses to Set Requests MIB II SupportMIB II Support Switch Connections Cisco WAN Switching Proprietary MIB StructureSwitch Service Objects Cisco WAN Switching Proprietary MIB Structure Endpoint Statistics Bandwidth ClassEndpoint Mapping 14-8Cisco BPX 8600 Series Reference BPX Node Specifications General General ATM Trunk Interface BXM-155 Cards Characteristic T3 DS3ATM Trunk Interface BXM-T3/E3 Cards ATM Trunk Interface BXM-T3/E3 Cards SMF LR ~40 KM ATM Trunk Interface BXM-155 Cards ATM Trunk Interface BXM-622 Cards ATM Trunk Interface BXM-622 CardsSMF IR TX SMF IR RX SMF LR TX SMF LR RX ATM T3 Trunk Interface BNI-T3, LM-3T3 ATM T3 Trunk Interface BNI-T3, LM-3T3 ATM E3 Trunk Interface BNI-E3, LM-3E3 ATM E3 Trunk Interface BNI-E3, LM-3E3 ATM OC3 Trunk Interface BNI-OC3, LM-OC3 ATM OC3 Trunk Interface BNI-OC3, LM-OC3 ATM Service Interface BXM-622 Cards ATM Service Interface BXM-T3/E3 CardsATM Service Interface BXM-155 Cards ATM Service Interface BXM-T3/E3 Cards ATM Service Interface ASI-1, LM-2E3 ATM Service Interface ASI-1, LM-2T3ATM Service Interface ASI-1, LM-2T3 ATM Service Interface ASI-2, LM-OC3 ATM Service Interface ASI-2, LM-OC3 12Cisco BPX 8600 Series Reference AC Powered Nodes BPX Switch Cabling SummaryPower Cabling Trunk Cabling LM-BCC Cabling DC Powered NodesTable B-3 DC Power Wiring Cable Parameter Description Auxiliary and Control Port Cabling Table B-6 LAN Port Cabling Cable Parameter Description LAN Port CablingModem Cabling Table B-7 LAN Port Pin Assignments Pin # Name T1 Clock Cabling External Clock Input CablingLM-BCC Cabling E1 Clock Cabling Table B-12through Table B-15lists E1 clock cabling details External Alarm Cabling External Alarm CablingStandard BPX Switch Cables Table B-17 Network Alarm Pin Assignments Description Table B-19 Redundancy Y-Cables Used On Cisco P/N Redundancy Y CableLM-BCC TBS Redundancy Y Cable BPX Switch Peripherals Cisco StrataView Plus Terminal Control Port, Local Control Table C-3 Switch a Settings-Okidata 184 Printer Description DIP Switch Settings for OkidataPrinter Table C-5 Switch 2 Settings-Okidata 184 Printer Description Table C-4 Switch 1 Settings-Okidata 184 Printer DescriptionPrinter Modems, Dial-In and Dial-Out Motorola V.34R BPX Switch Dial-In ConfigurationBPX Switch Auto-Answer Dial-In to BPX switch Modems, Dial-In and Dial-Out AT\N3 ATL1ATSØ=1 AT%C IPX Auto-Dial to Customer Service AT\Q1 AT\JAT\T3 8Cisco BPX 8600 Series Reference AT3-6ME Interface Adapter Application Equipment Description Interface ConnectorsEquipment Description T3 TX BNC Table D-1 Rear Panel Connectors Type DescriptionT3 RX BNC DB9 Table D-2 Front Panel Indicators Color Description DIP SwitchesFT2 Front and Rear Panel FT2 Installation InstallationAT3-6ME Configuration Table D-3 DIP Switch SW-1 Selection Guide Position Function Power-Up Sequence BPX, IGX, or IPX Port ConfigurationOperation Terminal Operation Normal OperationRemote Loop Operation Operation Table D-6 DIP Switch Settings CommandsTable D-7 Command Summary Parameters Meaning T3 interface SpecificationsSpecifications Table D-8 Status Display BPV NNN T2 Interface PowerSpecifications Mechanical 12Cisco BPX 8600 Series Reference Glossary ARM Alarm Relay Module ARC Alarm Relay CardARI Alarm Relay Interface Card ASM Alarm/Status Monitor Cards Channel B8ZS Bipolar with Eight Zero SuppressionBandwidth reservation BC-E1 Backcard E1 Ccdv Compliant Cell Delay Variation BPX SwitchCAS Channel Associated Signalling CCS Common Channel Signalling Cell relay CGA Carrier Group AlarmCell Circuit line CSU Channel Service Unit COS Class of ServiceCrosspoint switch Dacs Digital Access and Control System DS0 Digital Signal DDS Digital Data ServiceDial Access Switching DS1 Digital Signal ECN Explicit Congestion Notification DSI Digital Speech InterpolationDTE Data Terminal Equipment Fast EIA FPC FastPAD Back Card Frame Relay ServiceFrame forwarding Frame relay connection class FTM FastPAD Trunk Module IGX SwitchFTC FastPAD Trunk Card Gateway Junction node IPX SwitchIsdn Integrated Services Digital Network Junction trunk Minor alarm Local alarmMajor alarm Local addressing NPM Network Processor Module Packet switchingNPC Network Processor Card Nrm PCM Pulse Code Modulation Partially-interleaved EIAPBX private branch exchange PCR Peak Cell Rate Robbed bit signaling Red alarmRemote alarm 921/Q.931 SCC System Clock Card SAR Segmentation and ReassemblyRS-449 SCM System Clock Module Split clock SVC switched virtual circuitSpeech detection Status Enquiry Trunk TimestampTrm Trunk conditioning VBR Variable Bit Rate Voice Network SwitchingVAD Voice Activity Detection Virtual circuit Cables Yellow alarmCable redundancy ASI ABR STDAdtf ATM Fbtc DlciESP FRF.4 Frtt Snmp PnniSAM Spvc VCI TftpTSR VPI Documentation Response Card Strongly agree Strongly disagree Business 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