Universität Rostock

Fachbereich Elektrotechnik und Informationstechnik

Abkürzungen zum Fach Kommunikationssysteme

nur für den internen Gebrauch 03/99 Dr. Melzer, Kessler, Mali, Weiß http://www.comlab.uni-rostock.de/ 3

1TR6 D-Kanal-Protokoll im ISDN AIX Advanced Interactive Execute AL Application Layer AL Alignment A ALS Application Layer Structure AMI Alternate Mark Inversion AMIS Audio Message Interchange AA Administrative Authority Specification AAA Authentication, Authorization and AML ACPI Machine Language Accounting AMP Active Monitor Present AAL ATM Adaptation Layer AMT Agent Management Task AAPI ATM-API ANS Advanced Network and Services ABM Asynchronous Balanced Mode ANSI American National Standards ABR Available Bit Rate Institute ACATS Advisory Committee for AOAC Always On/Always Connected Advanced Television Systems AOC ADSL Overhead Control Channel ACD Automatic Call Distribution AOL America Online ACE Access Control Entry AP Access Point ACE Access Control Encryption APC Asynchronous Procedure Call ACF Access Control Field API Application Programming ACK Acknowledgement Interface ACL Access Control List APM Advanced Power Management ACM Association for Computer APPN Advanced Peer to Peer Machinery Networking ACM Adaptive Clock Methode APS Auxiliary Power Supply ACPI Advanced Configuration and ARA AppleTalk Remote Access Power Interface ARC Advanced RISC Computing ACR Attenuation to Crosstalk Ratio ARM Asynchronous Response Mode ACR Allowed Cell Rate ARP Address Resolution Protocol ACS Access Control Store ARPA Advanced Research Projects ACSE Association Control Service Agency Element ARPANETARPA Network A/D Analog-to-Digital ARQ Automatic Repeat Request ADCCP Advanced Data Communications ASA Adaptive Security Algorithm Control Procedure ASCII American Standard Code for ADM Add Drop Multiplexer Information Interchange ADPCM Adaptive Differential Pulse Code ASE Application Service Element Modulation ASIC Application-Specific Integrated ADSL Asymmetric Digital Subscriber Circuit Line ASK Amplitude Shift Keying ADSL Asynchronous Digital Subscriber ASL ACPI Source Language Loop ASN.1 Abstract Syntax Notation One ADT Attribute Definition Table ASP ATM Switch Processor Module AE Application Entity ASPI Advanced SCSI Programming AEC Acoustic Echo Cancellation Interface AfeN Analoges Fernsprechnetz ASVD Analog Simultaneous Voice/Data AFI Authority and Format Identifier AT Advanced Technology AFOS Active Fiber Optic Segment AT AT Attachment AGC Automatic Gain Control ATAPI AT Attachment Packet Interface AGW American Gauge Wire ATD Asynchronous Time Division AIP ATM Interface Processor ATDM Asynchronous Time Division AIS Alarm Indication Signal Multiplexing 3

ATM Asynchonous Transfer Mode BIOS Basic Input/Output System ATM-CC ATM Cross-Connect BIP Bit Interleaved Parity ATMR ATM Ring B-ISDN Breitband ISDN ATU ADSL Transceiver Unit B-ISSI Broadband Inter-Switching AU Access Unit System Interface AU Administrative Unit B-ISUP Broadband ISDN User Part AUI Attachment Unit Interface Bit Binary Digit AUI Audible User Interface BITNET Because It's Time Network AUU ATM Layer User to User Amerikanisches Forschungsnetz AUX Auxiliary B-Kanal Datenkanal eines ISDN- AVD Alternating Voice/Data Anschlusses AVI Audio-Visual Interface B-LCSE Bi-directional Logical Channel AVSSCS Audio Visual Service Specific Signaling Entity Convergence Sublayer BLNT Broadband Local Network AW Abschlußwiderstand Technology AWGN Additive White Gaussian Noise BLT Block Transfer BNT Border Network Technologies B-NT Broadband Network Termination B B-NT1 Network Termination 1 for B- ISDN B-NT2 Network Termination 2 for B- BA Basic Access ISDN BAKT Basisanschlußkonzentrator BOC Bell Operating Company BAMX Basisanschlußmultiplexer BOM Begin Of Message BAR Base Address Register BONDINGBandwidth On Demand BASize Buffer Allocation Size Interoperability Group B-BC Broadband Bearer Capability BOOTP Bootstrap protocol BBS Bulletin Board System BP Burst Periodic BBÜ Basisbandübertragung BPC Broadcast PC BCC Block Check Character BPDU Bridge PDU BCH Bose Chaudhuri Hocquenghem bpp Bits per pixel BCS Basic Combined Subset bps Bits per second BDC Backup Domain Controller BPSK Binary PSK BDK Business Development Kit BRI Basic Rate Interface BDSG Bundes Datenschutz-Gesetz BSD Berkeley Software Distribution BECN Backward Explicit Congestion (UNIX) Notification BSC Binary Synchronous Control BER Basic Encoding Rules BSI Bundesamt für Sicherheits- und BER Bit Error Rate Informationstechnik BERKOM Berliner Kommunikationssystem BT Burst Tolerance B-Frame Interpolated (bidirectional) BTag Beginning Tag Picture B-TA Broadband Terminal Adapter BGAK Begin Acknowledge B-TE Broadband Terminal Equipment BGAK-PDU Begin Acknowledged PDU B-TE1 Terminal Equipment 1 for B- BGN Begin ISDN BGP Border Gateway Protocol B-TE2 Terminal Equipment 2 for B- BGREJ-PDU Begin Reject PDU ISDN B-HLI Broadband High-Layer Btx Bildschirmtext Information BTZ Bundestechnisches Zentralamt B-ICI Broadband Intercarrier Interface BUS Broadcast and Unknown address BICMOS Bipolar Complementary Metal- Oxide Semiconductor BWB Bandwidth Balancing 4

BWIN Breitband-Wissenschaftsnetz CD Cell Delay BtxVst Btx Vermittlungsstelle CD-A Compact Disc Audio CDB Command Descriptor Blocks CDC Countdown Counter C CDD Connection and Data Distribution CDDI Copper Disributed Data Interface CDFS Compact disc CA Computer Associates CD-I Compact Disc Interactive International, Inc. CDMA Code-Division Multiple Access CA Collision Avoidance CD-R CD-Recordable CAC Connection Admission Control CD-R2 Physical Format for CD Read- CAD Computer Aided Design Only CAI Computer Assisted Instruction CD-ROM Compact Disc Read-Only CAL Computer Aided Learning Memory CAM Common Access Method CD-ROM-XA XA=Extendet Architecture CAM Carrier Module CDV Cell Delay Variation CAN Customer Access Network CDVT Cell Delay Variation Toleranz CAP Computer Aided Production CD WORM Compact Disc Write Only Read CAPI Common ISDN API Many CAQ Computer Aided Quality CE Consumer Electronics CAS Communicating Application CEN Comité Européenne de Specification Normalisation CASE Common Application Service CEP Connection Endpoint Element CEPT Comité Européenne de CAT Customer Activated Terminal administration des Postes et CAT Category Télécommunications CATV Cable Television CER Cell Error Ratio (Community Antenna Television) CERN Europäisches Zentrum für CBC Chain Block Cipher Teilchenphysik bei Genf, CBDS Connectionless Broadband Data Ursprung des World Wide Web Service CERT Computer Emergency Response CBQ Class-Based Queuing Team CBR Constant Bit Rate CESE Capability Exchange Signalling CBT Computer based training Entity CC Cross Connector CEQBW Cisco Equivalent Bandwidth CC Countdown-Counter Algorithm CC-Timer Connection Control Timer CF Convergence Protocol CCA Conceptual Communication Area CF Convergence Function CCIR The International Communication CFM Cipher Feedback Mode Consultative Committe CGW Customer Gateway (for DQDB) CCIT Comité Consultatif International CHAP Challenge Handshake Télégraphique Authentication Protocol CCITT Comite Consultatif Internationale CHS Cylinder Head Sector de Telegraphie et Telephonie C&I Control and Indication CCP Compression Control Protocol CI Component Instrumentation CCR Commitment Concurrency and CI Congestion Indikator Recovery CIB CRC/32 Indicator Bit CCTA Central Computer and Cica Großes Software-Archiv für Telecommunications Agency Windows- Programm CD Carrier Detection CICF Common Isochronous CD Collision Detection Convergence Functions CD Compact Disc CIE Customer Interface Equipment 5

CIE Commission Internationale de CODEC Coder/Decoder l’Eclairage COM (1) ; CIF Common Intermediate Format (2) Legacy serial port CIG Customer Interface Group COM Continuation Of Message CIM Common Information Model CONS Connection Oriented Network CINF Check (modem) INF tool Service CIR Committed Information Rate CORBA Common Object Request Broker CIS Card Information Structure Architecture CISC Complex Instructions Set COS Cooperation for Open Systems Computers COSE Common Open Software CIT Computer Integrated Telephony Environment CIT Customer Information Terminal COSINE Cooperation for Open Systems CL Connectionless Interconnection Networking CLCSE Close Logical Channel Signalling Europe Entity COTS Connection Oriented Transport CLLM Consolidated Link Layer Service Management CP Common Part CLNAP Connectionless Network Access CP-AAL Common Part AAL Protocol CPCS Common Part Convergence CLNIP Connectionless Network Interface Sublayer Protocol CPCS-UU CPCS User-to-User CLNP Connectionless Network Protocol CPE Convergence Protocol Entity CLNS Connectionless Network Service CPE Customer Premise Equipment CLP Cell Loss Priority CPI Common Part Indicator CLR Cell Loss Ratio CPU Central Processing Unit CLS Connectionless Server C/R Command/Respond CLSF Connectionless Service Functions CR Call Request CLTS Connectionless Transport Service CR Call Reference CM-API Consolidated Management CRC Cyclic Redundancy Check CMI Coded Mark Inversion CRE Cell Reference Event CMIP Common Management CRMA Cyclic Reservation Multiple Information Protocol Access CMIS Common Management CRR Call Rejection Rate Information Service CRV Coding Rule Violation CMISE Common Management CS Carrier Sense (Convergence Information Service Element Sublayer) CMR Cell Misinsertion Rate CSA Connection and Streaming COM Continuation of Message Architecture CMOL CMIP Over Link Layer CSA Carrier Serving Area CMOS Complementary Metal-Oxide CSC Customer Service Center Semiconductor CSCW Computer Supported Cooperative CMOT CMIP Over TCP/IP Working CMP Connection Management Protocol CSEL Cable Select CMR Cell Misinsertion Ratio CSI Convergence Sublayer Indication CMYK Cyan-Magenta-Yellow-Black CSMA Carrier Sense Multiple Access CN Corporate Network CSMA/CA CSMA With Collision Avoidance CN Customer Network CSMA/CD CSMA With Collision Detection CNIU Customer Network Interface Unit CSN Card Select Number CNM Customer Network Management CSNET Computer Science Network CO Connection-Oriented CSPDN Circuit Switched Public Data COCF Connection Oriented Network Convergence Function CSR Command and Status Register 6

CSTA Computer Supported Telephony DCE Distributed Computing Application Environment CSU Communication/Channel Sevice DCI Display Control Interface Unit DCI Data Communication Interface CT Claim Token DCOM Distributed Component Object CT Cordless Telephone Model CT Cell Type DCS Data Communications Server CTD Cell Transfer Delay DCS Digital Celluar System CTP Cell Transfer Performance DCT Diskrete Cosinus Transformation CTS Clear To Send DDC Display Data Channel CUG Closed User Group DDE Dynamic Data Exchange CUL Computer unterstütztes Lernen DDI Device Driver Interface CUU Computer unterstützter Unterricht DDK Device Driver Kit CWIS Campuswide Information System DDL Data Definition Language CyBus Cisco Extended Bus DDML Display Driver Management Layer DDN Defense Data Network D DDV Daten Direkt Verbindung DE Discard Eligilibity DECT Digital European Cordless DA Destination Address Telephone DAA Data Access Arrangement DEE Datenendeinrichtung DAB Digital Audio Broadcasting DE-NIC Deutsches Network Information DAC Digital-to-Analog Converter Center DAC Dual Attachement Concentrator DEMUX Demultiplexer DAP Directory Access Protocol DES Data Encryption Standard DARPA Defense Advanced Research DF-1 Digitales Fernsehen 1 Project Agency DFA DXI Frame Address DAS Dual Attachment Station DFI Domain Specific Part Format DASD Direct Access Storage Device Identifier DAT Digital Audio Tape DFN-Verein Verein zur Förderung eines DATEX-J Data Exchange (Join) Deutschen DATEX-L Data Exchange Forschungsnetzes e.V (Leitungsvermittlung) DFÜ Datenfernübertragung DATEX-MData Exchange (Multimegabit) DFW Distributed Foundation Wireless DATEX-P Data Exchange DHCP Dynamic Host Configuration (Paketvermittlung) Protocol DATEX-S Data Exchange (Satellit) DI Device Interface DAVID Digital Audio/Video Interactive DIB Directory Information Base Decoder DIB Device-Independent Bitmap dB Dezibel DIGI Deutsche Interessen Gemeinschaft DBP Deutsche Bundespost Internet dbr Decibles above reference noise DIMDI Deutsches Institut für DBS Digital Broadcast medizinische Dokumentation Service/System/Satellite und Information DC Device Context DIN Deutsches Institut für Normung DCA Document Content Architecture DIP Dual In-Line Package DCC Data Country Code DIR Direction DCC Digital Cross Connect DIS Draft International Standard DCD Data Carrier Detect DISC Disconnect DCE Data Communications Equipment DIT Directory Information Tree DIV Digitale Vermittlungsstelle 7

DIVF DIV Fernvermittlungsstelle DSA Directory Service Agent DIVO DIV Ortsvermittlungsstelle DSAP Destination Service Access Point DIX DEC/Intel/Xerox DSD Data Structure Definition DK Dienstkennung DSE Development Software Engineer D-Kanal Steuerungskanal eines ISDN- DSI Distributed System Interworking Anschlusses Unit DKZE Digitale Kennzeichengabe auf DSL Digital Subscriber Line Endstellenleitungen DSLAM DSL Access Multiplexer DL Data Link DSLB Dual-mode Single Leaky Bucket DLC Data Link Control ( ^ GCRA) DLCI Data Link Connection Identifier DSM-CC Digital Storage Media - DLE Data Link Escape (character) Command and Control DLL Dynamic Link Library DSMX Digital Signal Multiplexer DLP Data Link Protocol DSP Digital Signal Processor DLPD Data Link Protocol Description DSP Directory System Protocol DLPI Data Link Provider Interface DSS1 Digital Subscriber Signalling DLS Distributed Link Services System no. 1 DM Disconnect Mode DSS Digital Subscriber Signalling DMA Direct Memory Access DSS Distributed Sample Scrambler DMDD Distributed Multiplexing DSS Directory Distributed Demultiplexing Synchronization (dir-sync) DME Distributed Management Server Environment DSU Data Service Unit DMI Desktop Management Interface DSVD Digital Simultaneous Voice/Data DMPDU Derived MAC PDU DTD Document Type Definition DMT Discrete Multitone DTE Data Terminal Equipment DMTF Desktop Management Task Force DTMF Dual Tone Multifrequency DMZ Demilitarized Zone DTP Distributed Transaction DN Distinguished Name Processing DNA Distributed Network Architecture DTR Data Terminal Ready (DEC) DU Data Unit DNG Datennetzabschlußgerät DUA Directory User Agent DNS Domain Name System DUI Data Unit Identifier DoD Department of Defense DUP Data User Part DOS Disk Operating System DV Datenverarbeitung DPAM Demand Priority Access Method DVSE DV Service und Einrichtung DPC Deferred Procedure Call DVA Datenverarbeitungsanlage DPCM Differential Pulse Code DVD (1)Digital Video Disk Modulation (2)Digital Versatile Disk DPG Distributed Packet Group DVE Datenvermittlungseinrichtung DPI Dots Per Inch DVI Digital Video Interface DPLL Digital Phase Locked Loop DVMRP Distance Vector Multicast DPMI DOS Protected Mode Interface Routing Protocol DPMS Display Power Management DVSt Datenvermittlungsstelle Signaling DVSt-P Datenvermittlungsstelle im DPSK Differential Phase Shift Keying DATEX-P DQAC Distributed Queue Access Control DXI Data Exchange Interface DQDB Distributed Queue Dual Bus DZP Dienstzugangspunkt DRAM Dynamic Random Access DÜ Dienstübergang Memory DÜE Datenübertragungseinrichtung DS Directory Services (Telekombezeichnung für DCE) DS Digital Signal 8

EGP Exterior Gateway Protocol E EGP External Gateway Protocol EGW Edge Gateway (DQDB) EIA Electronics Industries Association EA Extended Attributes EIDE Enhanced Integrated Device EAN European Article Number Electronics EANTC European Advanced Networking EIS Executive Information System Test Center EISA Extended Industry Standard EARBA Enhanced Adaptive Rate Based Architecture Algorithm E-Lan Emuliertes LAN EARN European Academic and Research EMB Extended Memory Block Network EMF Enhanced Metafile EAZ Endgeräteauswahlziffer EMS Elektronisches Mitteilungs EBCDIC Extended Binary Coded Decimal System (MHS) Interchange code Emu. Emulation EC Echo Cancelling EMUG European MAP Users Group ECB Electronic Code Book/Event EMV Elektromagnetische control block Verträglichkeit ECC Error Correction Code END-PDU End-PDU ECMA European Computer ENDAK-PDU End Acknowledgement PDU Manufacturers Association ENQ Enquiry ECO Errored Cell Outcome ENV Europäische Vornorm ECP Error Correcting Part EO European Online ECP Extended Capabilities Port EOB End Of Bus ECR Engineering Change Request EOC Embedded Operation Channel (for PCI) EOM End Of Message ED End Delimiter EOS End Of Stream EDC Error Detecting Code EPA Enhanced Performance EDFG Edge Device Functional Group Architecture EDI Electronic Data Interchange EPD Early Packet Discard EDIA Electronic Data Interchance EPP Extended Parallel Port Association (UK) EPRCA Enhanced Proportional Rate EDID Expended Display Identification Control Algorithm Data EPS Encapsulated Postscript EDIFACT EDI for Administration, ER Explicit Rate Commerce ERMES European Radio Message System and Transport ES End System EDS Elektronisches ESDI Enhanced Small Device Interface Datenvermittlungssystem ESF Extended Superframe EDSS1 European Digital Subscriber ES-IS End System to Intermediate Signalling System No. 1 System EDV Elektronische Datenverarbeitung ESIG European SMDS Interest Group EE Eastern European ET Exchange Termination EE Endeinrichtung Etag End Tag EET Enhanced Environment Eth. Ethernet Technology ETS European Telecommunication EFCN Explicit Forward Congestion Standard Notification ETSI European Telecomunication EFCI Explicit Forward Congestion Standardisation Institute Identification EUNET European UNIX Network EFI Errored Frame Indicator EV Etagenverteiler EG Endgerät EVSt Endvermittlungsstelle 9

EWMA Exponentially Weighted Moving FOMAU Fiber Optic Medium Attachment Average (UPC- Unit Fensteralgorithmus) fps Frames per second EWSD Elektronisches FQDN Fully Qualified Domain Name Wählvermittlungssystem Digital FR Frame Relay Ebone Euro Internet Backbone FRAD Frame Relay Assemmbly/Disassembly FRAU Frame Relay Adapter F FRBS Frame Relay Bearer Service FRMR Frame Reject FRS FADU File Access Data Unit FRS Frame Relay Service FAQ Frequently Asked Questions FR-SSCS Frame Relay Service Specific FAT Convergence Sublayer FAW Frame Alignment Word FS Frame Status F-Bit Final Bit FSD File System Driver FBR Fixed Bit Rate FSIP Fast Serial Interface Processor FC Frame Control FSK Frequence Shift Keying FC-AL Fibre Channel Arbitrated Loop FSN Full Service Network FCB File Control Block FT Payload Type FCP Function Control Protocol FTAM File Transfer Access and FCS File/Frame Check Sum Management (Frame Check Sum) FTDM Fixed Time Division Multiplexing FCS Frame Check Sequence FTP File Transfer Protocol FCVC Flow Controlled Virtual Channel FTS Fault Tolerance System FDC Floppy Disk Drive Controller FTTC Fiber To The Curb FDDI Fiber Distributed Data Interface FTTH Fiber To The Home FDDI-HRC FDDI Hybrid Ring Control FTZ Forschungs- und FDM Frequency Division Multiplexing Technologiezentrum (der DBP FDMA Frequency Division Multiple Telekom) Access FU Functional Unit FEBE Far End Block Error FUNI Frame based User-toNetwork FEC Forward Error Correction Interface FECN Forward Explicit Congestion FV Festverbindung Notification FWHM Full Spectral Width Half FEG Frame Relay Service Edge Maximum Gateway FYI For Your Information FEP Front End Processor FuVSt Funkvermittlungsstelle FERE Far End Receive Error FW Firewall FERF Far End Receive Failure FEXT Far-End Cross Talk FFOL FDDI Follow On G FG Functional Group FH Frame Handler FIB Forwarding Information Base GAL Global Address List FIFO First In/ First Out GAP Generic Access Profile (DECT) FL Fiber Optic Link GB Gigabyte FM Frequency Modulation GBG Geschlossene Benutzer Gruppe FMBS Frame Mode Bearer Service GBPS Gigabits Per Second FME Fast Multicast Engine GCAC Generic CAC FMUX Flexibel Multiplexer GCRA Generic Cell Rate Algorithm FOIRL Fiber Optic Inter Repeater Link GDI Graphics Device Interface 10

GDMO Guidelines for the Definition of HIPPI High Performance Parallel Managed Objects Interface GDT Global Descriptor Table H.KP Höheres GEN Global Engineering Network Kommunikationsprotokoll GEO Geostationary Orbit HLA High Layer Attribute GFC Generic Flow Control HLC High Layer Compatibility GFI Group Format Identifier HMA High-Memory Area GGP Gateway Gateway Protocol HMOM Hypermedia GI Gesellschaft für Informatik H-MUX Hybrid Multiplexer GID Group Identification HOB Head Of Bus GIF Graphics Interchange Format HODSP High Order Domain Specific Port GMD Gesellschaft für Mathematik und HPFS High-Performance File System Datenverarbeitung HPNPP High Priority Next Port pointer GMDP General Modulated Deterministic HPOV HP OpenView Process HPTHT High Priority Token Hold timer GOB Group Of Blocks HRC Hybrid Ring Control GP General Protection HS High Speed GPS Global Positioning Services HSB Hue-Saturation-Brightness GSM Global System for Mobile HSCDS High-Speed Cable Data Services Communications HSLAN High Speed LAN GUI Graphical User Interface HSM Hierarchical Storage Management GUID Globally Unique Identifier HSSI High Speed Serial Interface GUUG German Unix User Group HTML Hypertext Markup Language GV Gebäudeverteiler HTTP Hypertext Transport Protocol HVSt Hauptvermittlungsstelle HW Hardware H Hx Halbduplex Hz Hertz

HA Hardware Address I HAL Hardware Abstraction Layer HBFG Host Behavior Functional Group HCI Host Controller Interface I2O Intelligent I/O HCL Hardware Compatibility List IA International Alphabet HCS Header Check Sequence IAB Internet Activities Board HCT Hardware Compatibility Tests (IETF, IRTF) HDB-3-Code High Density Bipolar-3-Code IAB Internet Architecture Board HDC Hard disk I/O controller IAE ISDN-Anschlußeinheit HDCD High-Density CD IANA Internet Assigned Numbers HDLC High-level Data Link Control Authority HDSL High-bit-rate Digital Subscriber IA-PC Intel Architecture Personal Line Computer HDTV High-Definition TV IASG Internetwork Address Sub-Group HEC Header Checksum IBSG Internetwork Broadcast Sub- HEC Header Error Control Group HEL Header Extension Length IBUFG Internetwork Broadcast/Unkown HFC Hybrid Fiber-Coax Functional Group HfD Hauptanschluß für Direktruf IC Input Controller HHR Hamburger ICA Intelligent Communication Hochgeschwindigkeitsring Adapter HICOM High technology Communication ICAN Individual Customer Access HID Human Interface Device Network 11

ICC International Color Consortium IMDD Intensity Modulation With Direct ICCF Industrial Carriers Compatibility Detection Forum IMI Inter MAN Interface ICD Installable Client Driver IMP Interface Message Processor ICD Intelligent Call Distribution IMPDU Initial MAC PDU ICF Isochronous Convergence IMT Interactive Multimedia Terminal Function IN Individual Network (Provider) ICFG IASG Coordinating Function inARP inverse Address Resolution Group Protocol ICI Interchange Carrier Interface INMS Integrated Network Management ICM Image Color Matching System ICMP Internet Control Message Protocol I/O Inout/Output ICR Initial Cell Rate IOCTL I/O Control ID Identification ION Internetworking over Non- IDC International Corporation Broadcast Media Access IDE Integrated Device Electronics Networks IDFT Inverse DFT IOS I/O Supervisor IDI Initial Domain Identifier IOS Internetwork Operating System IDN Integrated Digital Network IP Internet Protocol IDP Internet Datagram Protocol IPC Interprocess Communication IDRP Inter Domain Routing Protocol IPL Initial Program Load IDU Interface Data Unit IPM Interpersonal Messaging IDT Internet Development Toolbox Ipng,Ipv6 Internet Protocol Next Generation IE Information Element Internet Protocol version 6 IEC International Electronical I-PNNI Integrated Private Network-Node Commission Interface IEEE Institute of Electrical and IPX Internetwork Packet Exchange Electronics Engineers IPv4 Internet Protocol, version 4 IETF Internet Engineering Task Force IPv6 Internet Protocol, version 6 IF Internetworking-Function IR Internet Router IFF Interchange File Format Ir Infrared I-FRAME Intraframe Picture IRC Internet Relay Chat IFS IrDA Infrared Data Association IFSMGR Installable File System Manager IRL Inter Repeater Link IfW ISDN for Workgroups IrLAP Ir Link Access Protocol IGMP Internet Group Management IrLMP Ir Link Management Protocol Protocol IRP I/O Request Packet IGN Internet Group Names IRP_MJ IRP Major IGP Interior Gateway Protocol IRQ Interrupt Request IGW Isochronous Gateway IRSL Intra Router Serial Link IHL Internet Header Length IRTF Internet Research Task Force IHV Independent Hardware Vendor IS Intermediate System IIS Internet Information Server ISA Industry Standard Architecture IISP Interim Inter-switch Signaling ISAG Internetwork Adress Sub Group Protocol ISAPI Internet Server API ILMI Interim Local Management ISC Internet Service Center Interface ISCF Interface Specific Convergence I-MAC Isochronous MAC Function IMADPCM Music-Oriented Codec ISDN Integrated Service Digital IMAC Isochronous Media Access Network Control ISDU Isochronous Data Unit IMC Isochronous Channel ISI Inter Symbol Interference 12

ISIS Image and Scanner Interface KB Kilobyte Specification KBPS Kilobit Per Second IS-IS Intermediate System to KBS Knowledge Based System Intermediate System protocol KDT Keyboard Definition Table ISN Initial Sequence Number KE Kopplungselement ISO International Standards kHz Kilohertz Organization KIS Krankenhaus-Informationssystem ISO/OSI International Standards KIT Kernsoftware für Intelligente Organization Open Systems Terminals Interconnection KP Kommunikationsprotokoll ISOC Internet Society KS Kommunikationsserver ISODE ISO Development Environment KSS Kunden-Server-Switch ISP Internet Service Provider ISR Interrupt Service Routine L ISSI Inter Switching System Interface ISU Isochronous Service User ISUP ISDN User Part LAN Local Area Network ISV Independent Software Vendor LANE LAN Emulation IT Information Type LAPB Link Access Procedure Balanced IT Informations-Technologie LAPD Link Access Procedure D-Kanal ITSEC Information Technology Security LAPM Link Access Protocol for Modems Evaluation Criteria LAT Local Area Transport ITU International Telecommunication LB Leaky Bucket Algorithmus Union LBA Logical Block Addressing ITU-R ITU Radiocommunications LBI Loopback Indication (Sector) LCD Liquid Crystal Display ITU-T ITU Telecommunications (Sector) LCI Logical Channel Identifier ITV Interactive Television LCN Logical Channel Number IVD Integrated Voice and Data LCO Lost Cell Outcome IVR Interactive Voice Response LCSE Logical Channel Signalling Entity IWF Interworking Function LD Laser Diode IWU Interworking Unit LDAP Lightweight Directory Access IWV Impulswahlverfahren Protocol IXI International X.25 Interconnect LE LAN Emulation LEC LE Client J LECID LEC Identifier LECS LE Configuration Server LES LAN Emulation Server JANET Joint Academic Network of Great LED Light-Emitting Diode Britain LENNI LAN-Emulation Server JEPI Joint Electronics Payment LFN Long File Name Inititive LE-D LE-Dienste JPEG Joint Photographic Experts Group LEN Length JTC Joint Technical Committee LEO Low Earth Orbit JTM Job Transfer and Manipulation LEP LE Protocol JW Jumping Window (UPC- LES LE Server Fensteralgorithmus) LEX Local Exchange LFC Local Function Capabilities LGN Logical Group Number K LI Length Indicator LIM Lotus-Intel-Microsoft 13

LIS Logical IP Subnet MARS Multicast Address Resolution LIT Landesamt für Server Informationstechnik MAS Management Application Service LL Leitweglenkung MAU Medium Access Unit LLA Low Layer Attribute MB Megabyte LLC Logical Link Control MBS Maximum Burst Size LLC-PI LLC Program Interface MBONE Multicast Backbone LLC/ISDN LLC ISDN-Konverter Mbps Megabits per second LL-ID Loopback Location Identification MCA Micro Channel Architecture LLS LAN Like Switching MCD Miniclient Driver LM Layer Management MCI Media Control Interface LME Layer Management Entity MCL Microsoft Compatibility Labs LMMP LAN/MAN Management Protocol MCO Misinserted Cell Outcome LMMS LAN/MAN Management Service MCP MAC Convergence Protocol LMMU LAN/MAN Management User MCR Minimum Cell Rate LOC Loss of Cell MCSA Multi Channel Spectral Analysis LOD Loss of Cell Delination MCSN Monitoring Cell Sequence Number LOF Loss of Frame MCT Modem Compatibility Test LOP Loss of Pointer MCU Multiconference Unit LOS Loss of Signal MD Message Digests LPT Line printer MDE Mobile Datenerfassung LRU Least-Recently Used MDI Multiple Document Interface LS Link State MDK Modem Developers Kit LSAP Link Service Access Point MDL Memory Descriptor List LSB Least Significant Bit MDSE Message Delivery Service LSD Low Speed Data Element LSI Large Scale Integration MEO Medium Earth Orbit LSP Link State Packet METRAN Managed European Transmission LSR Link State Router MFT Master File Table LSS Link Status Signal MFV Mehrfrequenzwählverfahren LT Line Termination MHS Message Handling System LTE Line Termination Equipment MHz Megahertz LU Logical Unit MI Management Interface LUNI LAN-Emulation User-to- MIB Management Information Base Network-Interface MICE Multimedia Integrated Conference LUNI Logical UNI in Europe LV Leitungsvermittlung MID Message Identifier LWL Lichtwellenleiter MID Multiplexing Identifier MIDI Musical Instrument Digital Interface M MII Media Independent Interface MIME Multipurpose Internet Mail Extensions MA Multiple Access MIN Multi Path Interconnection MAC Media Access Control Network MADK Microsoft ActiveX Development MIPS Millions of Instructions Per Kit Second MAN Metropolitan Area Network MIS Management Information System MAP Manufacturing Automation MISC MAZ Internet Service Center Protocol MIT Management Information Tree MAPI Messaging Application Program MJPEG Motion JPEG Interface 14

MLID Multiple Link Interface Driver MSVC Meta Signalling Virtual Channel MLP Multilink Procedure MTA Message Transfer Agent MLPPP Multilink point-to-point MTBF Meantime Between Failure protocol MTD Memory Technology Driver MLSE Maintenance Loop Signalling MTF Microsoft Tape Format Entity MTP Message Transfer Part MM Multimedia (Nachrichtentransportteil) MM Multimode MTS Message Telecomunication MMBG Mulimediabetriebsgesellschaft Service MMC Microsoft Management Console MTSE Message Transfer Service MMCD Multimedia Compact Disc Element MM-GF Multimode-Glasfaser MTTR Meantime To Repair MMIO Memory-Mapped I/O MTU Maximum Transmission Unit MMM Multimedia Mail MUD Multi-User-Dungeon MMS Manufacturing Message Service MTU Maximum Transmission Unit MNP Microcom Networking Protocol MUX Multiplexer MO Magneto-Optisch MVF MAC Convergence Function MO Managed Object MOSPF Multicast Open Shortest Path First protocol N MOTIS Message Oriented Text Interchange Standard MP Measurement Point NAC Network Adaption Capabilities MPC MPOA Client N-Adr. Netzwerkadresse MPEG Motion Picture Experts Group NAK Negative Acknowledgment MPOA Multiprotocol Over ATM NAP Network Access Protocol MPR Multi Protocol Router (Netzanschlußprozeß) MPR Mät-och PRovräd (schwed. NAP Network Access Provider Prüfstelle für NAS Network Access Server Meßgeräte) NAS Network Authentification Service MPS Multiprocessor Specification NAT Network Adress Translation MPS MPOA Server N-BC Narrowband Bearer Capability MPX Multiplexed NBDD NetBIOS Datagram Distribution MRSE Message Retrieval Service Server Element NBNS NetBIOS Name Server MS Message Store NBS National Bureau of Standards ms Millisecond NC Network Computer MSAP MAC Service Access Point NC Network Connection MSB Most Significant Bit NCB Network Control Block MSC Meta Signaling Cells NCCI Network Control Connection MSCDEX Microsoft Compact Disk Identifier Extension NCP Network Control Program MSDL Microsoft Download Library NCP NetWare Core Protocol MSDN Microsoft Developer Network NCPD Network Control Protocol MSDSE Master Slave Determination Description Signalling Entity NCSA National Center of MSIG Metasignalisierung Supercomputing Applications MSN Microsoft Network NDA Non-Disclosure Agreement MSN Multiple Subscriber Number NDD Norton Disk Doctor MSS MAN Switching System NDIS Network Driver Interface MSSE Message Submission Service Specification Element NDS NetWare Directory Services 15

NDÜ Netz- und Dienstübergang NSDU Network Service Data Unit NE Network Element NSF National Science Foundation NET Network Equipment Technologies (USA) NetBEUI NetBIOS Extended User Interface NSP Native Signal Processing NetBIOS Network Basic Input Output NSP Network Service Provider System NStA Nebenstellen Anlage NetBT NetBIOS over TCP/IP NT Network Termination NetPC Network PC NTBA Network Termination type Basic NetX NetWare 3.x client shell Access NEXT Near End Crosstalk NTFS Windows NT File System NFS Network File System NTSC National Television System NHRP Next Hop Resolution Protocol Committee NHS Next Hop Server NUA Network User Address NI Network Interface NUI Network User Identification NIC Network Interface Card NÜ Netzübergang NIITask ForceNational Information Nw Nachricht wartet Infrastructure Task Force NIS Network Information Service O NIST National Institute of Standards and Technology NIU Network Interface Unit OAK OEM Adaption Kit NL Network Layer OAM Operation And Maintenance NLM Netware Loadable Module OAMC Operation And Maintenance NLPID Network Layer Protocol ID Centre NLS National Language Support OC Output Controller NM Network Management OC Optical Carrier Signalling NMC Network Management Center OC-n Optical Carrier-n NMCC Network Management Center OCR Optical Character Recognition Connection ODA Office Document Architecture NMI Nonmaskable Interrupt ODBC Open Database Connectivity NMS Network Management Station ODI Open Datalink Interface NMS Network Management System ODIF Office Document Interchange NNI Network Node Interface Format NNI Network Network Interface ODS Offenes Deutsches Schulnetz NNM Network Node Manager OEM Original Equipment Manufacturer NNPP Normal Next Port Pointer OFDM Orthogonal Frequency Division NNTP Network News Transport Protocol Multiplexing NOC Network Operation Center OLE Object Linking and Embedding NOS Network Operating System OMAP Operation and Maintenance NP Network Provider Application Part NPA Network Point of Attachment OMG Object Management Group NPDU Networklayer PDU ONU Optical Network Unit NPI Network Provider Interface OOP Object Oriented Programming NRM Normal Response Mode OOK On/Off Keying (Unbalanced) OPAC Online Publications Access nrt-VBR Non-Real-Time Variable Bit Rate Catalog NRZ Non Return to Zero (Code) OpenHC Open Host Controller Interface NRZI Non Return to Zero Inverted OPK OEM preinstallation kit NS Network Service OS Operating System ns Nanosecond OSF Open Systems Foundation NSAP Network Service Access Point OSI Open System Interface 16

OSIE Open System Internetworking PDH Plesiochronous Digital Hierarchy Environment PDL Page Description Language OSN Offenes Subnetz PDN Public Data Network OSPF Open Shortest Path First protocol PDU Protocol Data Unit OSPM OS-directed Power Management PDX Private Digital Exchange OSR OEM Service Release PE Presentation Entity OSTC Open System Testing Consortium PE Protocol Entity OTC On-Tape Catalog PE Portable EXE OU Organizational Unit PEM Privacy Enhanced Mail OVSt Ortsvermittlungsstelle PER Packet Error Rate PES Packetized Elementary Stream PFOS Passive Fiber Optic Segment P PG Peer Group PGP Pretty Good Privacy PH Packet Handler PA Point of Attachment PHS Personal Handy Phone System PABX Private Automatic Branch PHY PHYsical Layer Exchange PI Protokoll Instanzen PACS Picture Archiving and PIC Programmable Interrupt Communication System Controller PAD Packet Assemblers/Disassemblers PICS Protocol Implementation PAD PADing Conformance Statements PAL format Phase Alternation Line PID Protocol Identification PAM Pulse Amplitude Modulated PIF Program Information File PAM Port Adapter Module PIM Physical Interface Module PAP Password Authentication Protocol PIN Personal Identification Number PARC Xerox Palo Alto Research Center PING Packet Inter Net Groper PAU Portable Access Unit PIO Programmed I/O P-Bit Poll Bit PIR Packet Insertion Rate PBR Peak Bit Rate PISO Parallel In Serial Out PBX Private Branch Exchange PIXEL Picture Element (2D) PC (1) Personal computer; PKI Protokoll Kontrollinformation (2) Packet classifier PKI Public Key Infrastructure PCI Peripheral Component PL Physical Layer Interconnect PL Presentations Layer PCL, Postscript Printer Communication PLC Power Line Communication Language PLC Physical Layer Convergence PCM Pulse Code Modulation PLCI Physical Link Connection PCMCIA Personal Computer Memory Identifier Card PLCP Physical Layer Convergence International Association Procedure PCN Personal Communication PLL Permanent Logical Link Network PLP Packet Layer Protocol PCR Peak Cell Rate PLR Packet Loss Rate PCT Private Communication PLS Physical Layer Signalling Technology PM Physical Medium PCTV Personal Computer Television PMA Physical Medium Attachment PDAs Personal Digital Assistant PMD Physical Medium Dependent PDC Primary Domain Controller PMP Point-to-Multipoint PDD Physical Device Driver PMxA Primärmultiplexanschluß PDE Protokoll Dateneinheiten PNNI Private Network-to-Network PDF Portable Document Format Interface 17

PnP Plug and Play PV Paketvermittlung PO Power Management Component PVC Permanent Virtual Channel in Kernel POH Path Overhead PON Passive Optical Network Q POP Point of presence POP3 Post Office Protocol, vers. 3 POS Point Of Sale QA Queued Arbitrated POSIX Portable Operating System QAM Quadrature Amplitude Interface Modulation POST Power-On Self Test QCIF Quarter CIF POTS Plain Old (analog) Telephone QFE Quick Fix Engineering Service/System QOS Quality of Service ppCDV Peak-to-Peak CDV QPDS Queued Packet Distributed Switch PPDU Presentation PDU QPSX Queued Packet and Synchronous PPM Presentation Protocol Machine Circuit Exchange PPM Pulse Position Modulation Q-Sig Signalisierung am Referenzpunkt PPP Point-to-Point Protocol Q PPSDN Public Packet Switched Data QT, QTVR Quicktime - Video-Format Network PPTP Point-to-Point Tunneling Protocol PR Printer R PRA Primary Rate Access PRI Primary Rate Interface PRIM Photo Realistic Image Manager R Router PRM Protocol Reference Model RACE Research and Development of PROM Programmable Read Only Advanced Communication in Memory Europe PS Postscript RADIUS Remote Authentication Dial In PS Packet Scheduler User Service PS Public Server RAM Random Access Memory PS Programm Stream RAMDAC RAM Digital-to-Analog PSAP Presentation Service Access Point Converter PSD Power Spectral Density RARP Reverse ARP PSDN Packet Switched Data Network RAS Remote Access Service PSE Packet Switching Exchange RAST-1 Receive-and-Send Terminal with PSK Phase Shift Keying an PSPDN Packet Switched PDN AAL1 Interface PSR Previous Segment Received RAST-1&5 Receive-and-Send Terminal with PSTN Public Switched Telephone AAL1 and AAL5 interfaces Network RAST-5 Receive-and-Send Terminal with PT Payload Type an PTE Path Termination Equipment AAL5 Interface PTI Payload Type Identifier RAW Read And Write PTN Personal Telecommunications RC Request Counter Number RCAC Ressource CAC PTR Pointer RCP Remote Procedure Call PTS Presentation Time Stamp RCU Remote Concentrator Unit PTT Post Telephone and RDA Remote Database Access Telecommunications (authority) RDI Remote Defect Indikation P-UNI Private UNI RDN Relative Distinguished Name PU Physical Unit RDS Radio Daten Service 18

RDR Redirector RSE Real System Environment REJ Reject RSFG Route Server Functional Group REQ Request RSP Route Switch Processor RES Reserved RST Restart RF Radio frequency RSV Rerserved RF Routing-Funktion RSVP ReSource reserVation Protocol RFC Request for Comments RT Request to send RFC822 Standardformat für die RT Routing-Tabelle Adressierung von RT Real Time elektronischer Post im Internet RT Remote Terminal RFP Request For Proposals RTC Real-Time Clock RFS Remote File System RTD Round Trip Delay RGB Red-Green-Blue RTDSE Round Trip Delay Signalling RI Ring Indication Entity RIP Routing Information Protocol RTP Real-time Transport Protocol RIPE Résaux IP Européens RTP Realtime Transport Protocol RIPL Remote Initial Program Load RTS/CTS Request To Send/Clear To Send RISC Reduced Instruction Set RTS Request To Send Computing RTS Residual Time Stamp Method RISE Reliable Transfer Service Element RTSE Reliable Transfer Service Element RJE Remote Job Entry RTT Round Trip Time RLE Run-Length Encoding rt-VBR Real-Time Variable Bit Rate RLV Ringleitungsverteiler RVCI Ring Virtual Channel Identifier RM Reference Model Rx Receive RM Ressource Management RMON Remote Monitoring RMS Root-Mean-Square S RMT Ring Management RNR Receiver Not Ready RNA Remote Network Access S0 ISDN-Basisanschluß ROAD Routing and Addressing Group S2M ISDN-Primäranschluß ROC Regional Operation Center SA Source Address ROLC Routing Over Large Clouds SAA System Applications Architecture ROM Read-Only Memory SAAL Signaling AAL ROSE Remote Operations Service SATAN Security Administrator´s Tool for Element Analyzing Networks ROT-1 Receive-Only Terminal with an SABM Set Asynchronous Balanced Mode AAL1 interface SABME Set Asynchronous Balanced Mode ROT-1&5 Receive Only Terminal with Extended AAL1 SAC Single Attachment Concentrator and AAL5 interfaces SAI Standard ATM Interface ROT-5 Receive-Only Terminal with an SAN Satellite Area Network AAL5 interface SAP Service Access Point RP Root Port SAPI Service Access Point Identifier RPC Remote Procedure Call SAR Segmentation And Reassembly RPC Root Path Cost Sublayer RR Receiver Ready SAS Single Attachment Station RR Relative Rate SASE Specific Application Service RS Reed Solomon Code Element RS 232 Serielle Schnittstelle SAT Synchronous Allocation Time RSA Public-key cipher for SBR Sustainable Bit Rate encryption/decryption 19

SCAM SCSI Configured Automatically Cache SCC Secure Computing Corporation SIG-P Signalisierungs-Protokoll SCCP Signalling Connection Control SIP SMDS Interface Protocol Point SIPC Simply Interactive PC SCF Service Control Function SIPO Serial In Parallel Out SCF Sequence count field SIR Serial Infrared SCOM Continuation Of Message SIR Sustained Information Rate SCP Service Control Point S-ISDN Schmalband-ISDN SCR Sustainable Cell Rate SL Session Layer SCSI Small Computer System Interface SLIP Serial Line Internet Protocol SCSP Server Cache Synchronization SLP Single Link Procedure Protocol SM Single Mode SCT Software Compatibility Test SM Service Module SCTO Successfully Transferred Cell SMF Single Mode Fiber Outcome SMAE System Management Application SD Sequenced Data Entity SD Start Delimiter SMART Self-Monitoring Analysis and SD Security Dynamics Reporting Technology SDE Software development engineers SMASE System Management Application SDH Synchronous Digital Hierarchy Service Element SDK Software Development Kit SMB SDLC Synchronous Data Link Control SMDS Switched Multi Megabit Data SDP-PDU Sequenced Data with Poll PDU Service SDSE Submission and Delivery Service SMF Service Management Function Element SM-GF Singlemode-Glasfaser SDSL Symmetric DSL SMI System Management Interrupt SDT Synchronous Data Transfer SM-LAN Shared Medium LAN SDU Service Data Unit SMP Symmetric Multiprocessing SE Session Entity SMPTE Society of Motion Picture and SEAL Simple and Efficient AAL Television Engineers SECAM Sequential Couleur a Memoire SMS (1) Microsoft Systems (Sequential Color with Memory) Management Server; SECB Severely Errored Cell Block (2) short messaging service SECBR Severely Errored Cell Block Ratio SMT Station Management SEG SMDS Edge Gateway SMTP Simple Mail Transport Protocol SEL Selector SMUX SNMP Multiplexing SET Secure Electronic Transaction SN Sequence Number SETP Stream Environment Transport SN Subnetz Protocol SNA Software Network Architecture SFD Start Frame Delimiter SNAP Subnetwork Access Protocol SFF Small Form Factor SNAP Sub-Network Attachment Point SFS Shared File System SNDAP Subnetwork Dependent Access SGML Standard Generalized Markup Protocol Language SNDCF Sub-Network Dependent SGMP Simple Gateway Monitoring Convergence Function Protocol SNDCP Subnetwork Dependent SH Segment Header Convergence Protocol SHM Short Hold Mode SNI SMDS Network Interface SI Subnet Identifier SNI Subscriber Network Interface SIG SMDS Interest Group SNICP Subnetwork Independent SIG Signalisierung Convergence Protocol SIGNC Special Internet Group Name SNMP Simple Network Management 20

Protocol SSI Single System Image SNP Sequence Number Protection SSL Secure Sockets Layer SNR Signal-to-Noise Ratio (also S/N) SSM Single Segment Message SOH Section Overhead SSP Service Switching Point SONET Synchronous Optical Network SSP Sevice Specific Protocol SOS Start Of Stream SSRP Simple Server Redundancy SOT-1 Send-Only Terminal with an Protocol AAL1 interface SSS Self Synchronizing Sample SOT-1&5 Send-Only Terminal with Scrambler AAL1 ST Segment Type and AAL5 interfaces STA Spanning Tree Algorithm SOT-5 Send-Only Terminal with an STAT Status AAL5 interface STDM Synchronous Time Division SP Segment Priority Multiplexing SP Source Policing STE Section Termination Equipment S/P Serial to Parallel conversion STI Still Image SPARC Scalable Processor Architecture STM Synchronous Transfer Mode SPAG Standard Promotion and STM-1 Synchronous Transport Module Application Group type 1 SPANS Simple Protocol for ATM STM-x Synchronous Transport Module Network Signalin Level x S/PDIF Sony/Phillips Digital Interface STP Signalling Transfer Point SPDU Session PDU STP Shielded Twisted Pair SPF Shortest Path First STS Synchronous Transfer Signal SPI Service Provider Interface STS-x Synchronous Transport Signal SPID Service profile identifier Level x SPM Session Protocol Machine STS/EN Status and Enable bits SPN Subscriber Premises Network STT Secure Transaction Technology SPP Sequenced Packet Protocol SV Standortverteiler SPX Sequenced Packet Exchange SVC Signalling Virtual Channel SPX/IPX Sequential Packet Exchange SVC Switched Virtual Connection /Internetwork Packet Exchange SVCC Signaling VCC SQCIF Sub QCIF SVD Simultaneous Voice/Data SQE Signal Quality Error SVGA Super Video Graphics Array SQL Structured Query Language S-VHS Super Video Home Standard SR Source Routing SW Software SRC Sample Rate Converter SYN Synchronisation SRT Source Routing Transparent Bridge SRTS Synchronous Residual Time T Stamp SS Switching System SS7 Signaling System No.7 TA Terminal Adapter SSA Serial Storage Architecture TACACS Terminal Access Controller SSAP Session Service Access Point Access Control System SSCF Service Specific Coordination TAE Terminal Application Entity Functions TAP Terminal Access Point SSCOP Service Specific Connection TAPI Telephony Application Program Oriented Protocol Interface SSCS Service Specific Convergence TAT Theoretical Arrival Time Sublayer TAX.25 Terminal Adapter for X.25 SSF Service Switching Function TAXI Transparent Asynchronous 21

Transmitter/Receiver Interface TL Technische Lieferbedingungen TBÜ Trägerbandübertragung TLI Transport Layer Interface TC Transmission Convergence TLV Tag Length Value TC Traffic Control TM Traffic Management TCSEC Trusted Computer System TNM Telecommunications Network Evaluation Criteria Management TCO (1)Total Cost of Ownership TOP Technical and Office Protocol (2)Schwed. Zentralorganisation TOS Type of Service TCO Tagged Cell Outcome TP Transport Protocol TCP Transmission Control Protocol TP Twisted Pair TCP/IP Transmission Control Protocol/ TPD Tail Packet Discard Internet Protocol TPDDI Twisted Pair Distributed Data TCU Trunk Coupling Unit Interface TD Traffic Discriptor TPON Telephony over PON TDI Transport Driver Interface TPSE Transaction Processing Service TDM Time Division Multiplexing Element TDMA Time-Division Multiple Access TR Token Ring TDR Time Domain Reflectometer TR-LAN Token Ring LAN TDS Time Division Switching TRT Token Rotation Timer TE Terminal Equipment TS Traffic Shaping TEI Terminal Endpoint Identifier TS Transport Stream TEL Trans-Europe-Line TS Time Stamp TELEFAX Telecommunication Faksimile TSAP Transport Service Access Point TELENET Telecommunication DATEX-P TSD Type-Specific Driver (USA) TSE Terminal Switching Exchange TELESEC Telecommunication Security TSPI Telephony Service Provider TELETEX Telecommunication combined Interface TELEX/DATEX-L TSR Terminate-and-Stay-Resident TELETEXT Telecommunication type video TTL (1) time to live; TEXT (2) transistor-transistor logic TELEX Teleprinter Exchange Service TTRT Target Token Rotation Timer (5 Bit) TTS Trouble Ticket System TELNET Telecommunication Network TTT Target Transmission time TEMEX Telemetry Exchange TTU Telex Teletex Umsetzer TEX Transit Exchange TU Tributary Unit TF Trägerfrequenz TUBA TCP/UDP With Bigger Addresses TFTP Trivial File Transfer Protocol TUC Total Number of Transfered User THT Token Hold Time Cells TI Telecommunications Industry TUCAN TCP/UDP On CLNP Addressed Association Networks TIA Telecommunications Industries TUG Tributary Unit Group Association TUNIC TCP/UDP over Non-existent IP TIS Trusted Information Systems Connections TJMW Triggered Jumping Moving TUP Telephone User Part Window (UPC- TV Television Fensteralgorithmus TVSt Teilnehmer-vermittlungsstelle TIFF Tag Image File Format Ttx Teletex TIG Topology Information Group Tx Telex TK Telekommunikation Tx Transmit TKAnl Telekommunikationsanlage TXD Transmission data TKO Telekommunikationsordnung TxNAsl Telexnebenanschluß-leitungen TL Transport Layer TxNStAnl Telexnebenstellenanlagen 22

V

U V.24 standardisierte serielle Schnittstelle, UA Unnumbered Acknowledge z.B. für die Verbindung von PC UART Universal Asynchronous und Receiver/Transmitter Modem (OSI-Schicht 1) UAS User Account System V.34 Protokoll für die UBR Unspecified Bit Rate Datenübertragung zwischen zwei UCT Universal Coordinated Time Modems mit UDB User Data Buffer Geschwindigkeiten bis zu UDP User Datagram Protocol 28.8kbit/s UE User Element (OSI-Schicht 1) UHCI Universal Host Controller V.34plus Protokoll für die Interface Datenübertragung zwischen zwei UI User interface Modems mit Geschwindigkeiten UID User Identification bis zu 33.6kbit/s UIP User Interface Part (OSI-Schicht 1) UMA Unified Memory Architecture V.42 Protokoll zur blockweisen UMD Unscrambled Mode Delimiter Fehlerkorrektur zwischen zwei UME UNI Management Entity Modems unter Verwendung von UMI User MAN Interface LAPM UMTS Universal Mobile (OSI-Schicht 2) Telecommunication System V.42bis Protokoll zur Datenkompression UNC Universal Naming Convention (bis zu 400 %) zwischen zwei UNI User Network Interface Modems nach dem Lempel-Ziv- UP Uniprocessor Algorithmus (OSI-Schicht 2) UPC User Parameter Control V.120 B-Kanal-Protokoll im ISDN mit UPS Uninterruptible Power Supply einer Übertragungs- UPT Universal Personal geschwindigkeit Telecommunications von 64 kbit/s (OSI-Schicht 2) UPT Unshielded Twisted Pair VAR (1)Value-added retailer URB USB Request Block (2) Variable URI Uniform Resource Identifier VAT Visual Audio Tool URL Universal Resource Locator V-ATM-API Virtuelles ATM-API USB Universal Serial Bus VBI Vertical Blanking Interval USRT Universal Synchronous Receiver VBN Vermitteltes Breitbandnetz Transmitter VBR Variable Bit Rate USTAT-PDU Unsolicited Receiver State VBR NRT Variable Bit Rate Non Real Time PDU VBR RT Variable Bit Rate Real Time USV Unterbrechungsfreie VC Virtual Circuit Stromversorgung VC Virtual Channel UTP Unshielded Twisted Pair VC-1 Virtual Container type 1 UTOPIA Universal Test & Operations V-CAPI Virtuelles CAPI physical Interface for ATM VCC Virtual Channel Connection UUCP Unix to Unix CoPy VCDFSD Virtual CD-ROM file system ÜK Übertragungskapazität driver ÜR Übertragungsrate VCFC Virtual Channel Flow Control ÜW Übertragungsweg VCI Virtual Channel Identifier VCR Video Cassette Recorder VDD Virtual Display Driver 23

VDE Verein Deutscher Dateiextension Elektrotechniker VDM (1) virtual DOS machine; (2) virtual W (Windows NT) VDMA Virtual Direct Memory Access VDMAD Virtual DMA device W3C World Wide Web Consortium VDSL Very high-data rate DSL W3O W3 Organization VDV Vorbestellte WAN Wide Area Network Dauerwählverbindung WAIS Wide Area Information System VESA Video Electronics Standards WBC Wide Band Channel Association WBEM Web-based Enterprise VF Vermittlungs-Funktion Management VFS Video Frame Synchronous WDCTRL Western Digital–compatible hard VFW disk controller VG Voice Grade WDL Windows Driver Library VGA Video Graphics Array WDM Win32 Driver Model VHS Video Home Standard WDM Wavelength Division Multiplexer VIM Vendor Independent Messaging WDMComm WDM Communications Class VLM NetWare 4.x client shell WDMCSA WDM Connection and Streaming VLAN Virtuelles LAN Architecture VLM Virtual Loadable Modul WfM Wired for Management VLSI Very Large Scale Integration WHQL Windows Hardware Quality VM Virtual Machine Laboratory VN Vermittlungsnetz WIN Wissenschaftsnetz VoD Video on Demand WinHEC Windows Hardware Engineering VOXEL Picture Element (3D) Conference VP Virtual Path WINS Windows Internet Name Service VPC Virtual Path Connection WinSock Windows Sockets VPCI Virtual Path Connection Identifier WISE Web Integrated with Security VPE Video Port Extensions WMI Windows Multiple VPI Virtual Path Identifier Instrumentation VPICD Virtual Programmable Interrupt WORM Write Once Read Many Controller Device WOSA Windows Open System VPIM Voice Profile for Internet Architecture Messaging WS Workstation VPL Virtual Path Link WSP WinSock Proxy VPN Virtual Private Network WWW World Wide Web VRAM Video RAM WYSIWYG What you see is what you get VRML Virtual Reality Modeling Language VSAT Very Small Aperture Terminal X, Y, Z VSD Vendor-Supplied Driver VSN Virtual Subnet VSt Vermittlungsstelle X.400 MHS Message Handling System VT Virtual Terminal X.75 B-Kanal-Protokoll im ISDN VT100 Video Terminal 100 XDR External Data Representation VTE Virtual Terminal Environment Standard VTP VLAN Trunk Protocol xDSL General class of DSL VUDA VESA Unified Graphics technologies Architecture XID Exchange Identification VxD Virtual Device Driver, XMP X Open Management Protocols 24

XMS Extended memory XNS Xerox Network System XTI X Open Transport Level Interface XTP Xpress Transfer Protocol YP Yellow Pages YUV Luminanz (Y), Chrominanz (U,V) ZAK Zero Administration Kit ZAW Zero Administration Windows ZZF Zentrale Zulassungsstelle Fernmeldewesen ZZK Zentraler Zeichengabekanal