| |
| 8ZS | Bipolar 8 Zero Substitution |
| |
| A1S | All OneS |
| AAL | ATM Adaptation Layer |
| ABM | Asynchronous Balanced Modem |
| ABR | Available Bit Rate, Area Border Router |
| ACF | Advanced Communiation Function |
| ACK | acknowledgment flag, TCP header |
| ACM | Address Complete Message |
| ACR | Abandon Call and Retry, Available Cell Rate |
| ACSE | Association Control Service Element |
| ADCCP | Advanced Data Communications Control Protocol |
| ADPCM | Adaptive Differential Pulse Code Modulation |
| ADSL | Assymetric Digital Subscriber Line |
| ADSU | ATM DSU |
| AEP | Appletalk Echo Protocol |
| AES | Advanced Encryption Standard |
| AFI | Authority Format Identifier |
| AHFG | ATM-attached Host Functional Group |
| AIMUX | ATM Inverse Multiplexing |
| AIS | Alarm Indication Signal |
| ALE | Address Lifetime Expectation |
| ALU | Average Line Utilization |
| AM | Amplitude Modulation |
| AMI | Aleternate Mark Inversion or ATM Management Interface |
| ANI | Automatic Number Identification |
| ANSI | American National Standards Institute |
| APCM | Adaptive Pulse Code Modulation |
| API | Application Program Interface |
| APPC | Advanced Program-to-Program Communication |
| APPN | Advanced Peer-to-Peer Networking |
| APS | Automatic Protection Switching |
| APaRT | Automated Packet Recognition/Translation |
| ARM | Asynchronous Response Mode |
| ARP | Address Resolution Protocol |
| ARPANET | Advanced Research Projects Agency NETwork |
| ARQ | Automatic Repeat reQuest |
| AS | autonomous system |
| ASBR | Autonomous System Boundary Router |
| ASCII | American Standard Code for Inforamtion Interchange |
| ASN.1 | Abstract Syntax Notation One |
| AST | Automatic Spanning Tree |
| ASTA | Advanced Software Technology and Algorithms |
| AT&T | American Telephone and Telegraph |
| ATDM | Asynchronous Time Division Multiplexing |
| ATM | Asynchronous Transfer Mode |
| AUI | Attachment User Interface |
| AUI | Autonomous Unit Interface or Auxiliary Unit Interface |
| |
| B-ICI | B-ISDN Inter-Carrier Interface |
| B-ISDN | Broadband ISDN |
| B-ISUP | Broadband ISDN User's Part |
| B-TE | Broadband Terminal Equipment |
| B8ZS | Binary 8-zero substitution |
| BBN | Bolt, Beranek and Newman |
| BC | Committed Burst |
| BCOB | Broadband Connection Oriented Bearer (Classes A,C,X) |
| BCP | Basic Call Process |
| BCP | Best Current Practice |
| BCP | Binary Communications Protocol |
| BCP | Bridging Control Protocol |
| BCP | Bulk Copy Program |
| BCP | Byte Control Protocol |
| BE | Excess Burst |
| BECN | Backward Explicit Congestion Notification |
| BER | Basic Encoding Rules. or Bit Error Rate |
| BERT | Bit Error Rate Tester |
| BES | Bursty Errored Seconds |
| BGP | Border Gateway Protocol |
| BGP | Border Gateway Protocol |
| BIGA | Bus Interface Gate Array |
| BIND | Berkeley Internet Name Domain |
| BIP | Bit Interleaved Priority |
| BISDN | Broadband ISDN |
| BIT | Binary digIT |
| BITS | Building Integrated Timing Supply |
| BNC | Bayonet-Neill Concelman |
| BNN | Boundary Network Node |
| BOC | Bell Operating Company |
| BOOTP | Boot(strap) Protocol |
| BPDU | Bridge Protocol Data Unit |
| BPF | BSD Packet Filter |
| BPHR | Basic Research and Human Resources |
| BPS | Bits Per Second or Binary Digits per Second |
| BPV | BiPolar Violation |
| BRI | Basic Rate Interface |
| BSC | Binary Synchronous Communication |
| BSD | Berkeley Software Distribution |
| BT | BlueTooth, Burst Tolerance |
| BUS | Broadcast and Unknown Server |
| Bit | Binary digit |
| |
| CAC | Carrier Admission Control |
| CAM | Content-Addressible Memory |
| CAS | Channel Associated Signalling |
| CATV | Cable TV, Community Antenna TV |
| CBDS | Connectionless Broadband Data Service |
| CBR | Constant Bit Rate |
| CCITT | Consultative Committee on International Telegraphy and Telephony |
| CCS | Common Channel Signalling |
| CD | Carrier Detect |
| CDDI | Copper Distributed Data Interface |
| CDMA | Code Division Multiple Access |
| CDMA | Code Division Multiple Access |
| CDN | Content Delivery Network |
| CDPD | Cellular Digital Packet Data |
| CDR | Call Detail Reporting |
| CDVT | Cell Delay Variation Tolerance |
| CE | Connection Endpoint |
| CEI | Connection Endpoint Identifier |
| CES | Circuit Emulation Service |
| CGA | Carrier Group Alarm |
| CGI | Common Gateway Interface |
| CHAP | Challenge Handshake Authentication Protocol |
| CIA | Classical IP over ATM |
| CICS | Customer Information Control System |
| CIDR | Classless Inter-Domain Routing |
| CIDR | Classless InterDomain Routing |
| CIM | Common Information Model |
| CIP | Carrier Identification Parameter |
| CIR | Committed Information Rate |
| CIX | Commercial Internet Exchange |
| CLAW | Common Link Access for Workstations |
| CLID | Calling Line ID, synonymous with ANI |
| CLIP | Classical IP |
| CLNP | Connectionless Network Protocol |
| CLNS | Connectionless Network Service |
| CLP | Cell Loss Priority |
| CLR | Cell Loss Ratio |
| CLS | ConnectionLess Service |
| CMI | Coded Mark Inversion |
| CMIP | Common Management Interface Protocol |
| CMIS | Common Management Information Services |
| CMNS | Connection-Mode Network Service |
| CMR | Cell Misinsertion Rate |
| CMT | Connection Management |
| CO | Central Office |
| CODEC | Coder/Decoder |
| CONP | Connection Oriented Network Protocol |
| COS | Class of Service, Corporation for Open Systems |
| CP | Control Point |
| CPCS | Common Part Convergence Sublayer |
| CPE | Customer Premises Equipment |
| CPHB | Computer Protocol Heart Beat |
| CPI-C | Common Programming Interface for Communications |
| CPNX | Computer Protocol Network Executive |
| CPU | Central Processing Unit |
| CRA | Cell Rate Adaptation |
| CRC | Cyclic(al) Redundancy Check |
| CRS | Cell Relay Service |
| CS | Convergence Sublayer or Controlled Slip |
| CSLIP | Compreseed SLIP |
| CSMA | Carrier Sense Multiple Access |
| CSNP | Complete Sequence Number PDU |
| CSU | Channel Service Unit |
| CTD | Cell Transfer Delay |
| CTS | Clear To Send, Common Transport Semantic |
| CoDec | COder/DECoder |
| Computer | Graphics Interface |
| |
| DAC | Dual Attached Concentrator |
| DACS | Digitial Access and Cross-Connect System |
| DARPA | Defense Advanced Research Projects Agency |
| DAS | Dual Attachment Station |
| DB | Decibels |
| DBA | Dynamic Bandwidth Allocation |
| DCC | Data Country Code |
| DCE | Data Circuit-Terminating Equipment, Data Communications Equipment |
| DCE | Distributed Computing Environment |
| DCF | Data Communication Facility |
| DCF | Data Compression Facility |
| DCF | Data Count Field |
| DCF | Design rule for Camera Filesystem |
| DCF | Distributed Coordination Function |
| DCF | Driver Configuration File |
| DCS | Digital Cross-connect System |
| DDE | Defense Data Network |
| DDM | Distributed Data Management |
| DDN | Defense Data Network |
| DDP | Datagram Delivery Protocol |
| DDR | Dial on Demand Routing |
| DE | Discard Eligibility |
| DES | Destination End Station, Date Encryption Standard |
| DF | Don't Fragment flag in IP header |
| DFA | DXI Frame Address |
| DGP | Dissimilar Gateway Protocol |
| DHCP | Dynamic Host Configuration Protocol |
| DIA | Document Interchange Architecture (SNA) |
| DISA | Defense Information Systems Agency |
| DLCI | Data Link Connection Indicator (Identifier) |
| DLO | Data Line Occupied |
| DLSw | Data LInk Switchin |
| DLU | Dependent LU |
| DLUR | Dependent LU Requesteer |
| DLUS | Dependent LU Service |
| DMA | Direct Memory Access |
| DMAC | Destination MAC |
| DMCA | Digital Millenium Copyright Act |
| DNA | Digital Network Architecture |
| DNIC | Data Network Identification Code |
| DNS | Domain Naming System |
| DNSIX | Dod Intelligence Information System Network Security for Information Exchange |
| DOCSIS | Data Over Cable Service Internet Specification |
| DOD | Department of Defense |
| DOSBS | Data Over Subscriber Bearer Service. |
| DQDB | Distributed Queue Dual Bus |
| DRAM | Dynamic RAM |
| DSAP | Destination Service Access Point |
| DSLAM | Digital Subscriber LAN Access Multiplexer |
| DSLAM | Digital Subscriber Line Access Multiplexer |
| DSP | Domain Specific Part |
| DSR | Data Set Ready |
| DSU | Data Service Unit |
| DSn | Digital Signal Leven n (n=0,1, 2, and 3) |
| DTE | Data Terminal Equipment |
| DTMF | Dual-Tone Multifrequency |
| DTR | Data Transmit (Terminal) Ready |
| DTS | Distributed Time Service |
| DUAL | Diffusing Update Algorithm |
| DVMRP | Distance Vector Multicast Routing Protocol |
| DXI | Data Exchange Interface |
| |
| EBONE | European IP backBONE |
| ECMA | European Computer Manufacturers Association |
| EDI | Electronic Data Interchange |
| EDIFACT | Electronic Data Interchange for Administration, Commerce and Transport |
| EEPROM | Electrically Erasable Programmable Read-Only Memory |
| EFCI | Explicit Forward Congestion Indication |
| EGP | Exterior Gateway Protocol |
| EIA | Electronic Industries Association |
| EISA | Extended Insdustry Standard Architecture |
| ELAN | Emulated Local Area Network |
| EMI | Electromagnetic Interference |
| EMP | Electromagnetic Pulse |
| EN | End Node |
| EOL | End of Option List |
| EOT | End of Transmission |
| EPROM | Erasable Programmable Read-Only Memory |
| EQL | EQuaLization |
| ER | Explicit Rate |
| ES | End System, Errored Second |
| ESD | Electrostatic Discharge |
| ESF | Extended SuperFrame |
| ESI | End System Identifier |
| ETHERIP | Ethernet-within-IP Encapsulation |
| ETSI | European Telecommunications Standards Institute |
| EXZ | Excessinve Zeroes |
| |
| FC | Face Contact |
| FCC | Federal Communications Commission |
| FCS | Frame Check Sequence |
| FDDI | Fiber Distributed Data Interface |
| FDL | Facilities Data Link |
| FDM | Frequency Division Multiplexing |
| FDM | Frequency Division Multiplexing |
| FEBE | Far End Block Error |
| FEC | Forward Error Correction |
| FECN | Forward Explicit Congestion Notification |
| FEP | Front End Processor |
| FERF | Far End Receive Error |
| FHSS | Frequency Hopping Spread Spectrum |
| FIFO | First In, First Out |
| FIN | FINish flag in TCP header |
| FM | Frequency Modulation |
| FNC | Federal Networking Council |
| FOIRL | Fiber Optic InterRepeater Link |
| FQDN | Fully Qualified Domain Name |
| FR | Frame Relay |
| FRAD | Frame Relay Accedd Device |
| FRS | Frame Relay Service |
| FST | Fast Sequence Transport |
| FTAM | File Transfer, Access and Management |
| FTP | File Transfer Protocol |
| FUNI | Frame-Based UNI |
| |
| GBPS | Gigabytes Per Second |
| GCAC | Generic Connection Admission Control |
| GCRA | Generic Cell Rate Algorithm |
| GDP | Gateway Discovery Protocol |
| GFC | Generic Flow Control |
| GGP | Gateway-to-Gateway Protocol |
| GNS | Get Neares Server |
| GOSIP | Government OSI Profile |
| GPRS | General Packet Radio Service |
| GPRS | Generic Packet Radio Service |
| GRE | Generic Routing Encapsulation |
| GSM | Global System for Mobile communiations |
| GSM | Global System for Mobile communications |
| GUI | Graphical User Interface |
| |
| HDB3 | High Density Bipolar |
| HDLC | High-level Data Link Control |
| HDLC | High-level Data-link Control |
| HEC | Header Error Control |
| HELLO | a routing protocol |
| HEPNet | High Energy Physics Network |
| HFC | Hybrid Fiber Coaxial |
| HIPPI | High Performance Parallel Interface |
| HIPPI | High Performance Parallel Interface |
| HMP | Host Monitoring Protocol |
| HPCC | High Performance Computing and Communications |
| HPR | High Performance Routing |
| HSRP | Hot Standby Router Protocol |
| HSSI | High Speed Serial Interface |
| HSSI | High Speed Serial Interface |
| HTML | HyperText Markup Language |
| HZ | Hertz |
| |
| I-NLSP | Integrated Net Layer Security Protocol |
| IAB | Internet Architecture Board |
| IANA | Internet Assigned Number Authority |
| ICD | International Code Designator |
| ICMP | Internet Control Message Protocol |
| ICMP | Internet Control Message Protocol |
| IDF | Intermediate Distribution Frame |
| IDI | Initial Domain Identifier |
| IDN | International Data Number |
| IDP | Initial Domain Part |
| IDPR | Inter-Domain Policy Routing Protocol |
| IDRP | Inter-Domain Routing Protocol |
| IDU | Interface Data Unit |
| IEC | International Electrotechnical Commission |
| IEEE | Institute of Electrical and Electronics Engineers |
| IEN | Internet Experiment Notes |
| IESG | Internet Engineering Steering Group |
| IETF | Internet Engineering Task Force |
| IFIP | International Federation for Information Processing |
| IGMP | Internet Group Management Protocol |
| IGP | Interior Gateway Protocol |
| IIH | Is-Is Hello |
| ILMI | Interim Local Management Interface |
| IMAP | Internet Message Access Protocol |
| IMAP | Internet Message Access Protocol |
| IMP | Internet Message Processor |
| internet | internetwork |
| INTERNIC | Internet Network Information Center |
| IP | Internet Protocol |
| IPAT | IP Address Takeover |
| IPC | Inter Process Communication |
| IPCP | Internet Protocol Control Protocol |
| IPCU | Internet Packet Core Utility |
| IPIP | IP-within-IP Encapsulation Protocol |
| IPPC | Internet Pluribus Packet Core |
| IPSO | IP Security Option |
| IPX | Internet Packet Exchange |
| IPXCP | Fulfills the same function as IPCP, but for IPX routing |
| IPXWAN | The WAN version of NetWare's IPX protocol. |
| IPng | IP next generation |
| IPv4 | Internet Protocol version 4 |
| IPv6 | Internet Protocol version 6 |
| IR | InfraRed |
| IRDP | ICMP Router Discovery Protocol |
| IRN | Intermediate Routing Node |
| IRSG | Internet Research Steering Group |
| IRTF | Internet Research Task Force |
| IRTP | Internet Reliable Transport Protocol |
| IS | Intermediate System |
| IS-IS | Intermediate System to Intermediate System |
| ISA | Industry Standard Association |
| ISDN | Integrated Services Digital Network |
| ISN | Initial Sequence Number |
| ISO | International Standards Organization, International Organization for Standardization |
| ISO-IP | International Standards Organization Internet Protocol |
| ISOC | Internet Society |
| ISODE | ISO development environment |
| ISP | Internet Service Provider |
| ISR | Inermediate Session Routing |
| ISSI | Inter-Switching System Interface |
| ITU | International Telecommunications Union |
| ITU | International Telecommunications Union |
| IWF | Interworking Function |
| IXC | Interexchange Carrier |
| |
| JPEG | Joint Photographic Experts Group |
| |
| KB | Kilobyte |
| Kb | Kilobit |
| Kbps | kilobits per second |
| |
| LAN | Local Area Network |
| LANE | Local Area Network Emulation |
| LAPB | Link Acces Procedure, Balanced |
| LAPD | Link Access Procedure on the D Channel |
| LAPM | Link Access Procedure for Modems |
| LARP | Locus Address Resolution Protocol |
| LASER | Light Amplification through Simulated Emission of Radiation |
| LAT | Local Area Transport |
| LATA | Locas Access and Transport Area |
| LBO | Line Build Out |
| LBX | Low Bandwidth X |
| LCI | Logical Channel Identifier |
| LCP | Link Control Protocol |
| LCV | Line Code Violations |
| LEC | Local Exchange Carrier, LAN Emulation Client |
| LECS | LAN Emulation Configuration Server |
| LED | Light Emitting Diode |
| LES | LAN Emulation Server |
| LE_ARP | LAN Emulation ARP |
| LFN | Long Flat Network |
| LIFO | Last In, First Out |
| LLB | Line Loopback |
| LLC | Logical Link Control |
| LMI | Local Management Interface |
| LNM | LAN Network Manager |
| LOF | Loss of Frame |
| LOP | Loss of Pointer |
| LOS | Loss of Signal |
| LPD | Line Printer Daemon |
| LQM | Line Quality Monitoring |
| LSA | Link State Advertisement |
| LSB | Least Significant Bit |
| LSP | Link State Packet |
| LU | Logical Unit |
| |
| MAC | Media Access Control |
| MAN | Metropolitan Area Network |
| MAP | Manufacturing Automation Protocol |
| MAU | Media Attachment Units |
| MB | Megabytes |
| MBPS | megabits per second |
| MBS | Maximum Burst Size |
| MBone | Multicast backBone |
| MCDV | Maximum Cell Delay Variance |
| MCI | Mulitport Communications Interface |
| MCLR | Maximum Cell Loss Ratio |
| MCR | Minimum Cell Rate |
| MCTD | Maximum Cell Transfer Delay |
| MD5 | Message Digest 5 |
| MDF | Main Distribution Frame |
| MGCP | Media Gateway Control Protocol |
| MHRP | Mobile Host Routing Protocol |
| MHS | Message Handling System |
| MIB | Management Information Base, Multimedia Integration Box |
| MIC | Media Interface Connector |
| MICP | Mobile Internetworking Control Protocol |
| MID | Message IDentifier |
| MIF | Machine-to-Machine Interface Format |
| MILNET | Military Network |
| MIME | Multipurpose Internet Mail Extensions |
| MIME | Multipurpose Internet Mail Extensions |
| MMF | Multimode Fiber Optic Cable |
| MODEM | MOdulator/DEModulator |
| MOP | Maintenance Operation Protocol |
| MOSPF | Multicast OSPF |
| MP | Multilink PPP |
| MPEG | Motion Pictures Experts Group |
| MPLS | MultiProtocol Label Switching |
| MPOA | Multiprotocol over ATM |
| MPP | Multichannel Point-to-Point Protocol |
| MQI | Message Queuing Interface |
| MRU | Maximum Receive Unit |
| MSAU | Multistation Access Unit |
| MSB | Most Significant Bit |
| MSL | Maximum Segment Lifetime |
| MSS | Maximum Segment Size |
| MTA | Message transfer Agent |
| MTP | Multicast Transport Protocol |
| MTU | Maximum Transfer (Transmission) Unit |
| MTU | Maximum Transmission Unit |
| MUX | multiplexer |
| Mb | megabits |
| Mbps | Megabits per second |
| |
| N-ISDN | Narrowband ISDN |
| NAK | Negative Acknowledgment |
| NAP | Network Access Point |
| NAS | Network Access Server |
| NAT | Network Address Translation |
| NAU | Network Addressable Unit |
| NAUN | Nearest Active Upstream Neighbor |
| NBMA | nonbroadcast multiaccess |
| NBP | Name Binding Protocol |
| NBS | National Bureau of Standards (now NIST) |
| NCP | Network Control Protocol (Program) |
| NDIS | Network Driver Interface Specification |
| NET | Network Entity Title |
| NFAS | Non-Facility Associated Signalling |
| NFS | Network File Sharing (System) |
| NHRP | Next Hop Resolution Protocol |
| NIC | Network Information Center, Network Interface Card |
| NIS | Network Information Service |
| NIST | National Institure of Standards and Technology |
| NIT | Network Interface Tap |
| NM | Network Management Entity |
| NML | Network Management Layer |
| NMS | Network Management System (Station) |
| NMVT | Network Management Vector Transport |
| NN | Network Node |
| NNI | Network-to-Network Interface or Network Node Interface |
| NNTP | Network News Transfer Protocol |
| NOAO | National Optical Astronomy Observatories |
| NOC | Network Operations Center |
| NOP | No OPeration |
| NOS | Network Operating System |
| NPC | Network Parameter Contro |
| NRM | Normal Response Model |
| NRZ | Non Return to Zero |
| NRZI | NRZ Inverted |
| NSA | National Security Agency |
| NSAP | Network Service Access Point |
| NSF | National Science Foundation |
| NSFNET-IGP | National Science Foundation Network Interior Gateway Protocol |
| NSI | NASA Science Internet |
| NT1 | Network Terminator Type 1 |
| NTP | Network Time Protocol |
| NTRI | NCP/Token ring interconnection |
| NVP-II | Network Voice Protocol II |
| NVRAM | Nonvolatile RAM |
| NVT | ASCII Network Virtual Terminal ASCII |
| NetBIOS | Network Basic Input/Output System |
| |
| OAM | Operation administration and maintenance cell |
| OC-n | Optical Carrier level-n |
| ODA | Open Document Architecture |
| ODI | Open Data Link Interface |
| OFDM | Orthogonal Frequency Division Multiplexing |
| OID | Object IDentifier |
| OIM | OSI Internet Management |
| ONC | Open Network Computing |
| OOF | Out of Frame |
| OSF | Open Software Foundation |
| OSI | Open Systems Interconnection |
| OSPF | Open Shortest Path First |
| OUI | Organizational Unique Identifier |
| |
| P/F | Poll/final bit |
| PAD | Packet Assember Dissassembler |
| PAM | Pulse Amplitude Modulation, Pluggable Authentication Module |
| PAP | Password Authentication Protocol |
| PARC | Palo Alto Research Center |
| PAWS | Protection Against Wrapped Sequence numbers |
| PBX | Private Branch Exchange |
| PCF | Packet Control Function |
| PCI | Protocol Control Information, Peripheral Component Interconnect |
| PCM | Pulse Code Modulation |
| PCR | Peak Cell Rate |
| PDA | Personal Digital Assistant |
| PDN | Public Data Network |
| PDU | Protocol Data Unit |
| PGP | Pretty Good Privacy |
| PHY | Physical Layer |
| PIM | Protocl Independent Multicast |
| PING | Packet INternet Groper |
| PLCP | Physical Layer Convergence Procedure |
| PLIP | Parallel Line IP |
| PLL | Permanent Logical Link |
| PLP | Packet Level Protocol |
| PLU | Primary LU |
| PM | Physical Medium |
| PMD | Physical Medium Dependent |
| PND | Present Next Digit |
| PNNI | Private Network Node Interface |
| PNNI | Private Network-to-Network Interface |
| POP | Points of Presence, Post Office Protocol |
| POSIX | Portable Operating System Interface |
| POST | Power-On Self Test |
| POTS | Plain Old Telephone Service |
| PPP | Point-to-Point Protocol |
| PPTP | Point-to-Point Tunnelling Protocol |
| PRI | Primary Rate Interface |
| PRM | Packet Radio Measurement |
| PROM | Programmable Read-Only Memory |
| PRS | Primary Reference Source |
| PSDN | Packet Switched Network |
| PSE | Packet Switched Exchange |
| PSH | PuSH flag in TCP header |
| PSN | Packet Switched Network, Packet Switched Node |
| PSTN | Public Switched Telephone Network |
| PT | Payload Type |
| PTT | Post Telephone and Telegraph |
| PU | Physical Unit |
| PUP | Parc Universal Protocol |
| PVC | Permanent Virtual Channel (or Circuit) |
| PVCC | Permanent Virtual Channel Connection |
| PVP | Permanent Virtual Path, Packet Video Protocol |
| PVPC | Permanent Virtual Path Connection |
| Plain | Old Time Sharing |
| |
| QAM | Quadrature Amplitude Modulation |
| QD | Queueing Delay |
| QLLC | Qualified Logical Link Control |
| QoS | Quality of Service |
| |
| R/U | Request/Response Unit |
| RADIUS | Remote Access DIalup User Service |
| RAM | Random Access Memory |
| RARP | Reverse Address Resolution Protocol |
| RAS | Random Access Storage |
| RAS | Reader Admission System |
| RAS | Reliability, Availability, Serviceability |
| RAS | Remote Access Service |
| RAS | Row-Address Strobe |
| RBHC | Regional Bell Holding Company |
| RBOC | Regional Bell Operating Company |
| RCF | Readers Comment Form |
| RCP | Remote CoPy |
| RD | Routing Domain |
| RDF | Resource |
| RDP | Reliable Data Protocol |
| RF | Radio Frequency |
| RFC | Request For Comments |
| RFI | Radio Frequency Interference |
| RI | Ring Indicator |
| RIF | Routing Information Field |
| RII | Routing Information Identifier |
| RIP | Routing Information Protocol |
| RMON | Remote MONitoring |
| ROSE | Remote Operation Service Element |
| RP | Rendezvous Point |
| RPC | Remote Procedure Call |
| RPM | Reverse Path Multicasting, Remote Port Module |
| RR | Resource Record |
| RS-# | Recommended Service No |
| RSA | Rivest-Shamir-Adleman |
| RSH | Remote Shell protocol |
| RSRB | Remote Source Remote Bridging |
| RSRB | Remote Source, Remote Bridging |
| RSS | Really Simple Syndication |
| RST | ReSeT flag in TCP header |
| RSVP | ReSerVation Protocol |
| RTCP | RTP Control Protocol |
| RTMP | Routing Table Maintenance Protocol |
| RTO | Retransmission Time Out |
| RTP | Routing Table Protocol |
| RTP | Rapid Transport Protocol |
| RTP | Real Time Protocol |
| RTS | Ready to Send, Request To Send |
| RTT | Round-Trip Time |
| RVD | MIT Remote Virtual Disk Protocol |
| |
| SA | Source (MAC) Address |
| SAC | Single Attached Concentrator |
| SACK | Selective Acknowledgment |
| SAP | Service Access Point, Servce Advertisement Protocol |
| SAR | Segmentation And Reassembly |
| SAS | Single Attachment Station |
| SC | Structured Cabling or Structured Connectors or Stick and Click |
| SCR | Sustainable Cell Rate |
| SCSI | Small Computer Systems Interface |
| SCTE | Serial Clock Transmit External |
| SDH | Synchronous Digital Hierarchy |
| SDLC | Synchronous Data Link Control |
| SDRP | Source Demand Routing Protocol |
| SDSU | SMDS DSU |
| SDU | Service Data Unit |
| SEAL | Simple and Efficient Adaptation Layer |
| SEL | Selector |
| SEP | Sequential Exchange Protocol |
| SES | Severely Errored Seconds |
| SF | Super Frame |
| SGML | Standard Generalized Markup Language |
| SGMP | Simple Gateway Management Protocol |
| SIP | Session Initiation Protocol |
| SIP | Simple Internet Protocol |
| SIR | Sustained Information Rate |
| SLIP | Serial Line IP |
| SMB | Server Message Block |
| SMDS | Switched Multimegabit Data Service |
| SMF | Single Mode Fiber |
| SMI | Structure of Management Information |
| SMRP | Simple Multicast Routine Protocol |
| SMT | Station Management |
| SMTP | Simple Mail Transfer Protocol |
| SNA | Systems Network Architecture |
| SNAP | SubNetwork Access Protocol |
| SNI | Subscriber Network Interface |
| SNMP | Simple Network Management Protocol |
| SNPA | Subnetwork Point of Attachment |
| SOAP | Simple Object Access Protocol |
| SONET | Synchronous Optical Network |
| SPANS | Simple Protocol for ATM Network Signalling |
| SPE | Smart Payload Envelope |
| SPID | Service Profile Identifier |
| SPVC | Smart PVC |
| SPX | Sequence Packtet Exchange |
| SRTP | Sequenced Routing Update Protocol |
| SS7 | Signalling System No. 7 |
| SSAP | Source Service Access Point |
| SSCOP | Service Specific Connection Oriented Protocol |
| SSCP | System Services Control Points |
| SSCS | Service Specific Convergence Sublayer |
| SSL | Secure Sockets Layer |
| SSP | Switch to switch Protocol |
| SSRR | Strict Source and Record Route |
| ST | Stick and Turn or Straight Tip |
| STA | Spanning Tree Algorithm |
| STM | Synchronous Transfer Module |
| STP | Shielded Twisted Pair, Spanning Tree Protocol |
| STS | Synchronous Transfer Signal |
| SVC | Switched Virtual Channel (or Circuit) |
| SVCC | Switched Virtual Channel (or Circuit) Connection |
| SVG | Scalable Vector Graphics language |
| SVPC | Switched Virtual Path Connection |
| SWIPE | IP with Encryption |
| SWS | Silly Window Syndrome |
| SYN | SYNchronize sequence numbers flag in TCP header |
| |
| TA | Terminal Adapter |
| TAC | Technical Assistance Center |
| TACACS | Terminal Access Concentrator Access Control Server |
| TAXI | Transparent Asynchronous Transmitter/Receiver Interface |
| TC | Transmission Convergence |
| TCP | Transmission Control Protocol |
| TCP/IP | Transmission Control Protocol/Internet Protocol |
| TCR | Tagged Cell Rate |
| TCS | Transmission Convergence Sublayer |
| TCU | Trunk Control Unit |
| TDM | Time Division Multiplexing |
| TDR | Time Domain Reflectometer |
| TE | Terminal Equipment |
| TFTP | Trivial File Transfer Protocol |
| TH | Transmission Header |
| TIA | Telecommnunications Industry Association |
| TIC | Token Ring Interface Coupler |
| TLI | Transport Layer Interface |
| TM | Traffic Management |
| TOP | Technical Office Protocol |
| TOS | Type Of Service |
| TTL | Time To Live |
| TUBA | TCP and UDP with bigger addresses |
| TUD | Trunk up-down |
| TWS | Two way simultaneous |
| Telnet | Terminal-to-remote Internet protocol |
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| UART | Universal Asynchronous Receiver/Transmitter |
| UAS | Unsavailable Seconds |
| UBR | Unspecified Bit Rate |
| UDP | User Datagram Protocol |
| UI | User Interface |
| ULP | Upper Layer Protocol |
| UNI | User-to-Network Interface |
| UNIX | an operating system inspired from MULTICS |
| UPC | Usage Parameter Control |
| URG | URGent pointer flag in TCP header |
| URI | Uniform Resource Identifier |
| URL | Uniform Resource Locator |
| UTC | Coordinated Universal Time |
| UTMS | Universal Telecommuniations System |
| UTOPIA | Universal Test & Operations Inferface for ATM |
| UTP | Unshielded Twisted Pair cable |
| UUCP | Unix-to-Unix Copy |
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| VBR | Virtual Bit Rate |
| VC | Virtual Channel or Circuit |
| VCC | Virtual Channel Connection |
| VCI | Virtual Channel Identifier |
| VCL | Virtual Channel Link |
| VCN | Virtual Circuit Number |
| VDSL | Very-High-Data-Rate DSL |
| VINES | Virtual Network Software |
| VLAN | Virtual Local Area Network |
| VLSM | Variable Length Subnet Mask |
| VNC | Virtual Network Computing |
| VOIP | Voice Over IP |
| VP | Virtual Path |
| VPC | Virtual Path Connection |
| VPDN | Virtual Private Data Network |
| VPI | Virtual Path Identifier |
| VPL | Virtual Path Link |
| VPN | Virtual Private Network |
| VPT | Virtual Path Terminator |
| VS/VD | Virtual Source/Virtual Destination |
| VSAT | Very Small Aperture Terminal |
| VT | Virtual Tributary |
| VTAM | Virtual Telecommunications Access Method |
| VTP | Virtual Terminal Protocol |
| |
| WAN | Wide Area Network |
| WAN | Wide Area Network |
| WAP | Wireless Application Protocol |
| WAP | Wireless Applicaton Protocol |
| WDM | Wavelength Division Multiplexing |
| WEP | Wired Equivalent Privacy |
| WEP | Wireless Encryption Protocol |
| WINS | Windows Internet Name Service |
| WSN | Wang Span Network |
| WTP | Wireless Transport Protocol |
| WWW | World Wide Web |
| WiFi | Wireless Fidelity |
| |
| XDMCP | X Display Manager Control Protocol |
| XDR | eXternal Data Representation |
| XDSL | group term referring to ADSL, HDSL, SDSL, VDSL |
| XHTML | eXtensible HTML |
| XID | eXchange IDentification |
| XML | eXtensible Markup Language |
| XML-DSO | XML Data Source Object |
| XNS | Xerox Networking System Internetwork Datagram Protocol |
| XPATH | XML Path Language |
| XQL | XML Query Language |
| XSDL | XML Schema Description Language |
| XSL | eXtensible Stylesheet Language |
| XSL-FO | XSL Formatting Objects |
| XSLT | XSL Transformations |
| XTI | X/Open Transport layer Interface |
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| ZBTSI | Zero Byte Time Slot Interchange |
| ZIP | Zone Information Protocol |
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