Glossar Netze, Internet und DFÜ von Prof. Jürgen Plate

Abkürzungen

B-HLI	Broadband High Layer Information
B-ICI	Broadband Inter-Carrier Interface
B-ISDN	Broadband Integrated Services Digital Network
B-ISSI	Broadband Inter-Switching System Interface
B-ISUP	Broadband Integrated Services User Part
B-LLI	Broadband Low Layer Information
B2	Mobilfunknetz der Telekom
B8ZS	Bipolar 8 Zero Substitution
B	Bearer (64Kbps DS-0 Channel)
BAPT	Bundesamt für Post und Telekommunikation
BBz	Baubezirk
BD	Battery On Discharge
BECN	Backwards Explicit Congestion Notification
BER	Basic Encoding Rules (ASN.1)
BER	Bit Error Rate, Bitfehlerhäufigkeit
BGP	Border Gateway Protocol
BIP	Bit Interleaved Parity
BIPV	Bit Interleaved Parity Violation
BIS	Border Intermediate System (ATM Forum, PNNI SWG)
Bit	Kleinste Informationseinheit, Wert = 0/1 bzw. Nein/Ja
BITS	Building Integrated Timing Supply
BK	Breitbandkommunikation (u.a. Kabelfernsehen)
BOC	Bell Operating Company (or RBOC)
BOM	Begining of Message
BOOTP	Bootstrap Protocol
BPDU	Bridge Protocol Data Unit
bps	Bits per second, Bit/s
bps	bits per second
BRAS	Broadband Remote Access Server
BRI	Basic Rate Interface
BSC	Base Station Controller
BSP	Bell System Practice
BSS	Broadband Switching System
BT	Burst Tolerance
Btx	Bildschirmtext
Bu	Buchungsstelle
BUS	Broadcast Unknown Server
Byte	Gruppe von 8 Bits, kann 1 Zeichen darstellen
BZT	Bundesamt für Zulassungen in der Telekomunikation

C	Mobilfunknetz der Telekom
CAC	Connection Admission Control
CAD/CAM	Computer Aided Design/Computer Aided Manufacturing
CAP	Customer Administration Panel
CAP	Carrierless Amplitude and Phase Modulation
CAPI	Common Application Program Interface (ISDN)
CATV	Community Antenna TeleVision or CAble TeleVision
CBR	Constant Bit Rate
CCBS	Completion of Calls to Busy Subscriber
CCEI	Centre de communication et d'Essais International
CCIF	Comité consultatif international des télécommunications grandes distance (Zwischenstaatlicher beratender Ausschuß für den Fernsprechverkehr)
CCIR	Comité consultatif international des radiocommunications (Zwischenstaatlicher Ausschuß für den Funkdienst)
CCITT	Comité consultatif international télégraphique et téléfonique (jetzt ITU-T)
CCS	Common Channel Signaling
CCSS7	Common Channel Signaling System 7
CDMA	Code Division Multiple Access
CDO	Community Dial Office or Codial Office
CDV	Cell Delay Variation
CDVT	Cell Delay Variation Tolerance
CEC	Common Equipment Card
CEI	Connection Endpoint Identifier (UNI 3.0)
CEMF	Counter EMF Cells
CEPT	Konferenz der europäischen Post- und Fernmeldeverwaltungen
CER	Cell Error Ratio
CES	Circuit Emulation Service
CHAP	Challenge Handshake Authentication Protocol
CI	Congestion Indicator
CIP	Classical IP over ATM
CIR	Committed Information Rate
CIX	Commercial Internet Exchange
CLIP	Calling Line Identification Presentation (Rufnummernanzeige)
CLIP	Classical IP
CLP	Cell Loss Priority
CLR	Cell Loss Ratio
CLS	Connectionless Service
CMIP	Common Management Information Protocol
CMIS	Common Management Information Service
CMISE	Common Management Information Service Element
CMYK	Cyan-Magenta-Yellow-Black
CNR	Complex Node Representation (ATM Forum, PNNI SWG)
CO	Central Office
CO	Connection-Oriented
Codec	Coder/Decoder
COM	Communication port (serielle Schnittstelle)
CPCS	Common Part Convergence Sublayer
CPE	Customer Premise Equipment
CPI	Common Part Indicator
CRC	Cyclic Redundancy Check (Prüfsummenverfahren)
CRC	Cyclic Redundancy Check
CRF(VC)	Virtual Channel Connection Related Function
CRF(VP)	Virtual Path Connection Related Function
CRF	Cell Relay Function
CRS	Cell Relay Service
CS	Convergence Sublayer
CSMA/CD	Carrier Sense Multiple Access with Collision Detection
CSMA	Carrier Sense Multiple Access (Netz-Kollisionserkennung)
CSMA	Carrier Sense Multiple Access
CSU	Channel Service Unit
CT	Cordless Telephone (Schnurlostelefon, Standards CT1, CT1+, CT2)
CTD	Cell Transfer Delay
CTI	Computer Telephony Integration (Telefonie-Anwendungen)
CVSD	Continuously Variable Slope Delta modulation

DÜE	Datenübertragungseinrichtung (Modem)
D-AMPS	Digital-Advanced Mobile Phone Service
D/A	Digital to analog conversion
D/A	Digital-Analog-Umsetzung
D1	GSM-Mobilfunknetz der Telekom
D2	GSM-Mobilfunknetz von Mannesmann Mobilfunk
D	Delta (Q3B+D)
DA	Doppelader
DAC	Dual Attached Concentrator
DARPA	Defense Advanced Research Projects Agency
DAS	Dual Attached Station
DAT	Digital Audio Tape
Datex-J	Datex Jedermann (=Btx)
Datex-L	Datex mit Leitungsvermittlung
Datex-M	Datex MAN
Datex-P	Datex mit Paketvermittlung
Datex	Data exchange
dB	Decibel
dBrnC	Weighted Electrical Noise
DC	Direct Current
DCC	Data Country Code
DCS-1800	Digital Communications System
DE	Discard Eligibility
DECT	Digital European Cordless Telecommunications
DECT	Digital European Cordless Telephone
DEE	Datenendeinrichtung (Computer, Terminal)
DES	Destination End System
DFÜ	Datenfernübertragung
DFA	Distribution Fuse Alarm
DFS	Deutscher Fernmeldesatellit (Kopernikus)
DHCP	Dynamic Host Configuration Protocol (für dynam. IP-Adr.)
DHCP	Dynamic Host Configuration Protocol
DIP	Dual In-Line Package Switch
DIV	Digitale Vermittlungstechnik
DIVA	DIV Auslandsebene
DIVF	DIV Fernebene
DIVO	DIV Ortsebene
DLC	Data Link Control
DLCI	Data Link Connection Identifier
DLL	Dynamic Link Library, Windows-Bibliotheksdatei
DMA	Direct Memory Access
DMS	Digital Multiplex System
DNID	Data Network IDentification number
DNS	Domain Name Service
DNS	Domain Name System (Namensvergabe in IP-Netzwerken)
DOS	Disk Operating System (MS-DOS, PC-DOS)
DPL	Digital Power Line (1 MBit/s auf 230-V-Leitungen)
DQDB	Distributed Queue Dual Bus
DS-0	Digital Signal (Level 0)
DS-1	Digital Signal (Level 1)
DS-3	Digital Signal (Level 3)
DSAP	Destination Service Access Point
DSL	Digital Subscriber Line
DSLAM	Digital Subscriber Line Access Multiplexer
DSR	Data Set Ready
DSS1	Protokoll von Euro-ISDN
DSS	Digital Subscriber Service (DSS1=Euro-ISDN)
DSSS	Direct Sequence Spread Spectrum (bei Funk-LANs)
DSt	Dienststelle
DSU	Data Service Unit
DSX	Digital Service Cross-Connect
DT	Direktion Telekom
DTE	Data Terminal Equipment
DTL IE	Designated Transit List Information Ethernet
DTL	Designated Transit List
DMT	Discrete Multi Tone, Vielträgermodulationsverfahren
DTMF	Dual Tone Multi Frequency (Mehrfrequenzverfahren)
DTMF	Dial Tone Multiple Frequency
DSLAM	Digital Subscriber Line Access Multiplexer
DVD	Digital Video Disc.
DVMA	Direct Virtual Memory Access
DWDM	Dense Wavelength Division Multiplexing
DXI	Data Exchange Interface
DXI	Digital Exchange Interface

E&M	Earth & Magnet
E-1	European (Signal Level 1)
E-3	European (Signal Level 3)
E1	PCN-Mobilfunknetz von E-Plus
EAZ	Endgeräte-Auswahlziffer (ISDN-1TR6)
ECM	Error Correction Mode
ECM	External Configuration Model
ECT	Explicit Call Transfer (Vermitteln bei ISDN)
EDFG	Edge Device Functional Group (ATM Forum, MPOA SWG)
EDGE	Enhanced Data Rates for GSM Evolution
EDI	Electronic Data Interchange
EEPROM	Electric Ereasable Progamable ROM (elektrisch löschbares Read-Only-Memory)
EFCI	Explicit Forward Congestion Indication
EFCN	Explicit Forward Congestion Notification
EGC	Enhanced Group Call (Inmarsat-C)
EGP	External (Exterior) Gateway Protocol
EISA	Extended Industry Standard Architecture
ELAN	Emulated LAN (ATM Forum LANE)
EMD	Edelmetallmotordrehwähler
EMI	ElectroMagnetic Interface
EMI	Electromagnetic Interference
EMS	Element Management System
ENID	EGC network ID (Inmarsat-C)
EOM	End of Message
EPRCA	Enhanced Proportional Rate Control Algorithm
EPROM	Erasable Programmable Read-Only Memory
EPROM	Ereasable Progamable ROM (mit UV-Licht löschbares Read-Only-Memory)
EQL	Equilization
ER	Explicit Rate
ER	Externer Rechner (bei Datex-J)
ES	Erred Seconds
ESCON	Enterprise Systems CONnection
ESF	Extended Super Frame
ESI	End System Identifier
ESN	Electronic Serial Number
ESS	Electronic Switching System
ETACS	Extended Total Access Communications System
ETSI	European Telecommunication Standards Institute
EVZ	Endverzweiger
EWS	Elektronisches Wählsystem
EWSA	Elektronisches Wählsystem analog
EWSD	Elektronisches Wählsystem digital
EWSM	Elektronisches Wählsystem Metropolitan Area Network
EWSO	Elektronisches Wählsystem Ortstechnik

FA	Fernmeldeamt
FA	Fuse Alarm
FAG	Fernmeldeanlagengesetz
FCAPS	Fault, Configuration, Accounting, Performance, Security
FCC	Federal Communications Commission
FCS	Frame Check Sequence
FCS	Frame Checksum (Rahmenprüfsumme, vgl. CRC)
FCVC	Flow Controlled Virtual Circuit
FD	Frame Discard
FDDI	Fiber Distributed Data Interface (Glasfasernetz)
FDDI	Fiber Distributed Data Interface
FDM	Frequency Division Multiplex
FDMA	Frequency Division Multiple Access (Mehrkanalbetrieb)
FEA	Functional Entity Action (UNI 3.0, C.3.2.3)
FeAp	Fernmeldeapparat
FEBE	Far End Block Error (SONET)
FEC	Forward Error Correction
FECN	Forward Explicit Congestion Notification
FeTAp	Fernsprechtischapparat
FeWAp	Fensprechwandapparat
FEXT	Far End Crosstalk - Übersprechen am fernen Ende
FG	Functional Group (ATM Forum, MPOA SWG)
FGD	Frame Ground
FHSS	Frequency Hopping Spread Spectrum (bei Funk-LANs)
FIFO	First-In, First-Out buffer (z.B. bei COM-Ports)
FIFO	First-In, First-Out
FM	Frequenzmodulation
FO	Fiber Optics
FQ	Fair Queuing
FR-SSCS	Frame Relay Service Specific Convergence Sublayer
FR	Frame Relay
FSK	Frequency Shift Keying (Modems)
FTP	File Transfer Protocol
FTP	File Transfer Protocol
FTZ	Fernmeldetechnisches Zentralamt
FUD	Fear Uncertainty Doubt
FUNI	Frame based User-to-Network Interface (ATM Forum)

G	Abkürzung für "Giga", 1 Milliarde, z.B. 1 GHz = 1000 MHz
GAN	Global Area Network
GAP	Generic Access Profile
GB	GigaByte
GbAnz	Gebührenanzeiger
GBI	Gebührenimpuls
Gbps	Gigabit per second
GCRA	Generic Cell Rate Algorithm
GDT	Generaldirektion Telekom
GFC	Generic Flow Control
GKS	Geschäftskunden-Service
GMSK	Gaussian Minimum Shift Keying (GSM-Modulation)
GMT	Greenwich Mean Time (Weltzeit, wie UT)
GOSIP	Government OSI Protocol
GPRS	General Packet Radio Service (in GSM-/UMTS-Netzen)
GPRS	General Packet Radio Service for GSM networks
GPS	Global Positioning System (Satelliten-Navigationsdienst)
GSM	Global System for Mobile Communication
GSM	Global System for Mobile communications
GSM	Group Special Mobile
GSM	Groupe Speciale Mobile
GUI	Graphical User Interface
GW	Gruppenwähler

HBFG	Host Behavior Functional Group (ATM Forum, MPOA SWG)
HDLC	High speed Data Link Control
HDLC	High-Performance Data Link Control
HDSL	High Bitrate Digital Subscriber Line
HDTV	High Definition Television
HDW	Hebdrehwähler
HEC	Header Error Check
HEC	Header Error Control
HEX	Hexadezimal, Zahlensystem mit Basis=16; Ziffern 0-9 und A-F
HF	High Frequency
HLS	Hue-Lightness-Saturation
HPPI	High Performance Parallel Interface
HSCSD	High Speed Circuit Switched Data
HSCSD	High-Speed Circuit Switched Data (in GSM-Netzen)
HSSI	High Speed Serial Interface
HTML	Hyper-Text Markup Language
HTML	Hypertext Markup Language
HTTP	Hyper Text Transfer Protocol
HTTP	Hypertext Transfer Protocol
HV	High Voltage
HVStW	Hauptvermittlungsstellenwähler
HVt	Hauptverteiler
Hz	Hertz, Schwingungen pro Sekunde

I&R	Installation And Repair
I-PNNI	Integrated PNNI
I/O	Input/Output
IAB	Internet Activities Board
IAE	ISDN-Anschluß-Einheit
IANA	Internet Assigned Numbers Authority
IASG	Internetwork Address Sub-Group (ATM Forum, MPOA SWG)
IBSG	Internetwork Broadcast Sub-Group (ATM Forum, MPOA SWG)
IBUFG	Internetwork Broadcast/Unknown Functional Group (ATM Forum, MPOA SWG)
IC	Integrated Circuit
ICFG	IASG Coordinating Function Group (ATM Forum, MPOA SWG)
ICI	Inter-Carrier Interface
ICMP	Internet Control Message Protocol
ICT	Implicit Call Transfer (ISDN-Vermitteln durch Halten/Auflegen)
IDN	Integrated Digital Network
IDP	Initial Domain Part
IDPS	Inmarsat Data Packet Service
IDRP	Inter-Domain Routing Protocol
IDSL	ISDN Digital Subscriber Line
IDU	Interface Data Unit (UNI 3.0)
IE	Information Element
IEC	Inter-Exchange Carrier
IEE	Institution of Electrical Engineers
IEEE	Institute of Electrical and Electronic Engineers
IESG	Internet Engineering Steering Group
IETF	Internet Engineering Task Force
IGMP	Internet Group Management Protocol
IGP	Internal (Interior) Gateway Protocol
IGRP	Internal (Interior) Gateway Routing Protocol
IISP	Interim Inter-Switch Signaling Protocal (P-NNI Phase 0)
ILMI	Interim Local Management Interface
IMT-2000	International Mobile Telecommunications-2000
IN	Intelligent Net (z.B. Service 130 etc.)
IN	Intelligent Network
IP	Internet Protocol
IPI	Intelligent Peripheral Interface
IPX/SPX	Internet Packet Exchange/Sequenced Packed Exchange
IR	Infra-Red Controller
IS-IS	Intermediate System-to-Intermediate System
ISDN	Integrated Services Digital Network
ISO	International Standards Organization
ISOC	Internet Society
ISP	Internet Service Provider
ISSI	Inter-Switching System Interface
ITU-T	International Telecommunications Union Telecommunication Standardization Sector
ITU	International Telecommunication Union
IWF	Inter-Working Function
IWV	Impulswählverfahren
IXC	Inter eXchange Carrier

JPEG	Joint Pictures Experts Group

k	Abkürzung für die Zahl 1000, z.B. 1 kHz = 1000 Hz
K	Abkürzung für die Zahl 210 = 1024, z.B. 1 KBit = 1024 Bit
KHz	Kilohertz
KVA	Kilovoltampere
KVSt	Knotenvermittlungsstelle
KVStW	Knotenvermittlungsstellenwähler
KVZ	Kabelverzweiger
KW	Kilowatt
KWh	Kilowattstunden

LAN	Local Area Network (lokales Netzwerk)
LANE	LAN Emulation (ATM Forum)
LAP-B	Link Access Protocol-Balanced
LAP	Link Access Protocol (Übertragungsprotokoll)
LAPB	Link Access Protocol B-Channel
LAPD	Link Access Protocol D-Channel
LATA	Local Access Transport Area
LBL	Lawrence Berkeley Labs
LBO	Line Build Out
LCD	Liquid Crystal Display
LCD	Loss of Cell Delineation
LCT	Last Compliance Time (used in GCRA definition)
LE	Link Encapsulation
LEC	LAN Emulation Client or Local Exchange Carrier
LEC	Local Exchange Carrier
LECS	LAN Emulation Configuration Server
LED	Light Emitting Diode
LENNI	LAN Emulation NNI
LES	LAN Emulation Server
LES	Land Earth Station (Satelliten-Erdfunkstelle)
LGN	Logical Group Node (ATM Forum, PNNI)
LIFO	Last-in, First-Out
LIS	Logical IP Subnet
LLC/SNAP	Logical Link Control/Subnetwork Access Protocol
LLC	Logical Link Control
LOF	Loss of Frame
LOP	Loss of Pointer
LOS	Loss of Signal
LPC	Linear Predictive Coding (GSM-Sprachkompression)
LPT	Line PrinTer port (Parallel-Port für Druckeranschluß)
LRF	Little Rubber Feet
LRU	Last recently used (Cache-Strategie)
LSB	Least Significant Bit
LTE	Line Terminating Equipment
LUNI	LAN Emulation UNI
LV	Low Voltage
LW	Leitungswähler

M	Abkürzung für 1 Million, manchmal auch 220 = 1.048.576
MAC	Media Access Control (Netzwerk-Schnittstelle)
MAN	Metropolitan Area Network (Stadtnetz)
MARS	Multicast Address Resolution Server (Draft IETF-IPATM-IPMC-04)
MAU	Medium Attachment Unit (IEEE 802.3)
MAU	Multistation Access Unit (IEEE 802.5)
MBONE	Multi-Media Backbone
Mbps	Megabits (millions of bits) per second
MBS	Maximum Burst Size
MCC	Maintenance Control Center
MCR	Minimum Cell Rate
MCS	Multicast Server
MDF	Main Distribution Frame
MES	Mobile Earth Station (mobile Satelliten-Anlage)
MExE	Mobile Station Application Execution Environment
MFV	Mehrfrequenzcode-Wählverfahren
MHC	Modified Huffman Code
MIB	Management Information Base
MID	Message IDentifier
MIME	Multipurpose Internet Mail Extensions
MJPEG	Motion JPEG
MM	Multi-Mode
MMF	MultiMode Fiber
MMR	Modified Modified Read
MNP	Microcom Networking Protocol
MPC	MPOA Client
MPEG	Motion Picture Experts Group
MPLS	Multi-Protocol Label Switching
MPOA	MultiProtocol Over ATM
MPS	MPOA Server
MRC	Modified Read Code
MSA	Metropolitan Statistical Area
MSB	Most Significant Bit
MSC	Mobile Switching Center
MSN	Multiple Subscriber Number (ISDN-Rufnummer)
MTBF	Mean Time Between Failure
MTBO	Mean Time Between Outages
MTSO	Mobile Telephone Switching Office
MTSR	Mean Time To Service Restoral
MTTR	Mean Time To Repair
MTU	Maximum Transfer Unit

NAM	Number Assignment Module
NAU	Network Access Unit
NAUN	Nearest Available Upstream Neighbor
NBMA	Non-Broadcast Multiple Access
NC	Normally Closed
NCC	Network Control Center
NDIS	Network Device Interface Specification
NE	Network Element
NEBS	Network Equipment Building Spec
NEMA	National Electrical Manufacturers Association
NetBEUI	NetBIOS Extended User Interface
NetBIOS	Network Basic Input/Output System
NEXT	Near End Crosstalk - Übersprechen am nahen Ende
NHRP	Next Hop Resolution Protocol
NHS	Next Hop Server
NIC	Network Information Center (vergibt Internet-Domains)
NICNAME	Network Information Center Name Service
NIU	Network Interface Unit
NIWF	Network Interworking Function
NLPID	Network Layer Protocol ID
NM	Network Management
NMCC	Network Management Control Center
NME	Network Management Entity
NML	Network Management Layer
NMS	Network Management Station
NMT	Nordic Mobile Telephone
NMVT	Network Management Vector Transport
NNI	Network-to-Network Interface
NO	Normally Open
NRZ	Non-Return to Zero
NRZI	Non-Return to Zero Inverted
NSAP	Network Layer Service Access Point
NSF	National Science Foundation Network
NSt	Nebenstelle
NStAnl	Nebenstellenanlage
NT	Network Termination (ISDN)
NT	Network Termination (ISDN-Hausanschluß)
NTA	Network Termination Analog; siehe PPA
NTBA	Network Termination Basis Anschaltung
NTSC	National Television Standards Committee

OAM	Operations, Administration, and Maintenance
OBEX	Object Exchange
OC-n	Optical Carrier-n
OCA	Over Current Alarm
OCC	Other Common Carriers
OCD	Out-of-Cell Delineation (UNI 3.0 Section 2.1.2.2.2)
ODI	Open Data Link Interface
OEM	Original Equipment Manufacturer
ON	Ortsnetz
ONA	Open Network Architecture
ONKZ	Ortsnetzkennzahl
OOF	Out of Frame
OOS	Out of Service
OPAL	Optische Anschlußleitung
OS	Operating System
OSI	Open Standards Interface (ISO-Schichtenmodell)
OSI	Open Systems Interconnect
OSP	Outside Plant
OSPF	Open Shortest Path First
OUI	Organizationally Unique Identifier (RFC 1483)
P-NNI	Private Network-to-Network Interface or Private Network Node Interface
PABX	Private Automatic Branch Exchange (Nebenstellenanlage)
PAD	Packet Assembly/Disassembly (Datex-P)
PAL	Phase Alternating Line
PAP	Password Authentication Protocol
PBX	Private Branch Exchange
PC	Priority Control
PCB	Printed Circuit Board
PCM	Pulse Code Modulation (ISDN-Sprachcodierung)
PCN	Personal Communications Network
PCR	Peak Cell Rate
PCS	Personal Communications Service
PD	Propagation Delay
PDC	Personal Digital Cellular
PDH	Plesiochronous Digital Hierarchy
PDSC	Power Distribution Servicing Cabinet
PDU	Packet Data Unit
PDU	Protocol Data Unit
PGL	Peer Group Leader (ATM Forum, PNNI)
PID	Persönlicher Informationsdienst
PID	Protocol IDentifier
PING	Packet INternet Groper
PIP	Picture-In-Picture
PKS	Privatkunden-Service
PKV	Privatkunden-Vertrieb
PLC	Power Line Communication (2 MBit/s über 10-/20-kV-Leitung)
PLCP	Physical Layer Convergence Protocol
PLL	Phase Locked Loop
PM	Physical Medium
PMD	Physical Medium Dependent
PMP	Point to Multipoint
PO	Proper Operation
POH	Path Overhead (SONET)
POI	Path Overhead Indicator
POP	Point of Presence (Mail-Protokoll)
POPS	Points of Presence
POTS	Plain Old Telephone Service
PPA	Passiver Prüf-Abschluß
PPD	Partial Packet Discard
PPP	Point-to-Point Protocol
PPPoA	PPP over ATM
PPPoE	PPP over Ethernet
PRI	Primary Rate Interface
PROM	Programmable Read Only Memory
PSDN	Public Switched Data Network (Datex-P)
PSK	Phase Shift Keying (Modems)
PSTN	Public Switched Telephone Network (Telefonnetz)
PSTN	Public Switched Telephone Network
PT	Payload Type
PTE	Path Terminating Equipment (SONET)
PTI	Payload Type Identifier
PTSE	PNNI Topology State Element (ATM Forum, PNNI)
PTSP	PNNI Topology State Packet
PTT	Post, Telephone, and Telegraph
PTZF	Pan-Tilt-Zoom-Focus
PUC	Public Utility Commission
PVC	Permanent Virtual Circuit
PVCC	Permanent Virtual Channel Connection
PVPC	Permanent Virtual Path Connection
PWB	Printed Wire Board

Q-Factor	Quality for JPEG
QA	Quality Assurance
QAM	Quadrature Amplitude Modulation (Modems)
QoS	Quality of Service
QPSK	Quadature Phase Shift Keying (Modems)

RA	Rectifier Alarm
RAM	Random-Access-Memory (Schreib-/Lese-Speicher)
RARP	Reverse Address Resoultion Protocol
RAS	Remote Access Service
RBOC	Regional Bell Operating Company
RCA	Radio Corporation of America
RDI	Remote Defect Indicator (UNI Fault Management)
RED	Random Early Discard
RegTP	Regulierungsbehörde für Telekommunikation und Postwesen
RF	Radio Frequency
RFA	Rectifier Failure Alarm
RFC	Request For Comment
RFFG	Remote Forwarder Functional Group
RFI	Request For Information
RFP	Request For Proposal
RFQ	Request For Quotation
RG	Ring Ground
RGB	Red-Green-Blue
RIF	Rate Increase Factor
RIP	Routing Information Protocol
RM	Resource Management
RMON	Remote Monitoring
RNA	Remote Network Access
ROLC	Routing Over Large Clouds
ROM	Read-Only Memory
RPQ	Request for Price Quotation
RSFG	Route Server Functional Group (ATM Forum, MPOA SWG)
RSVP	Reservation Protocol
RTTY	Radio Teletype (Funkfernschreiben)

SA	Source Address
SAA	Systems Applications Architecture
SAAL	Signaling ATM Adaptation Layer
SAP	Service Access Point
SAR	Segmentation and Reassembly
SAS	Single Attached Station
SC	Stick and Click
SCP	System control Processor
SCR	Silicon-Controlled Rectifier
SCR	Sustainable Cell Rate
SCSI	Small Computer Systems Interface
SCT	Same Clock Timing
SDH	Synchronous Digital Hierarchy
SDLC	Synchronous Data Link Control
SDSL	Symmetric Single - pair High - bitrate Digital Subscriber Line
SDU	Service Data Unit
SEAL	Simple and Efficient Adaptation Layer
SECAM	Sequential with Memory
SECB	Severly Errored Cell Block
SEL	Selector
SES	Severely Errored Seconds
SF	Single Frequency
SF	Switch Fabric
SFD	Start of Frame Delimiter
SI	Status Indicator
SIM	Subscriber Identity Module card
SIM	Subscriber Identity Module
SIMM	Single In-line Memory Module
SIR	Sustained Information Rate
SLIP	Serial Line IP
SM	Single Mode
SMDS	Switched Multimegabit Data Service
SMF	Single Mode Fiber
SMS	Selective Multicast Service
SMS	Short Message Service (in GSM-Netzen)
SMS	Short Message Service
SMTP	Simple Mail Transfer Protocol
SNA	Systems Network Architecture
SNAP	Sub-Network (Area Protocol) Attachment Point
SNDCF	Sub-Network Dependent Convergence Function (ATM Forum, MPOA SWG)
SNMP	Simple Network Management Protocol
SONET	Synchronous Optical Network
SPANS	Simple Protocol for ATM Network Signaling
SPVC	Soft Permanent Virtual Connection
SRB	Source Routing Bridging
SRTS	Synchronous Residual Time Stamp
SS7	Signaling System #7
SS	Switching System
SSCF	Service Specific Coordinate Function
SSCOP	Service Specific Connection Oriented Protocol
SSCS	Service Specific Convergence Sublayer
ST	Stick and Turn
STDM	Statistical Time Division Multiplexing
STE	Section Terminating Equipment (SONET)
STM	Synchronous Transport Module
STP	Shielded Twisted Pair (geschirmte verdrillte Leitung)
STS-n	Synchronous Transport Signal-n
SVA	Signature componant of AVA/ATV
SVC	Switched Virtual Circuit
SVCC	Switched Virtual Channel Connection
SVPC	Switched Virtual Path Connection
SynchML	Synchronization Markup Language

TA	Terminal Adapter
TACS	Total Access Communications System
TAE-F	TAE für Fernsprecher
TAE-N	TAE für alle Endeinrichtungen außer Fernsprecher
TAE	Telekommunikations-Anschluß-Einheit
TAPI	Telephony Application Programming Interface
TAT	Theoretical Arrival Time (used in GCRA definition)
TAXI	Transparent Asynchronous Transmitter/Receiver Interface
Tbps	Terabits per second
TC	Transmission Convergence
TCA	TeleCommunications Association
TCP/IP	Transmission Control Protocol/Internet Protocol
TCP	Transmission Control Protocol
TCR	Tagged Cell Rate
TDD	Time Division Duplex (Senden und Empfangen auf einer Frequenz)
TDM	Time Division Multiplexing
TDMA	Time Division Multiple Access (Zeitschlitzverfahren)
TDS	Time Division Switching
TEI	Terminal End Identifier (interne ISDN-Endgerätenummer)
TFE	Türfreisprecheinrichtung
TFTP	Trivial File Transfer Protocol 
TIA	Telecommunications Industry Association
TIF	Telephone Influence Factor
TIG	Topology Information Group (ATM Forum, PNNI)
TkAnl	Telekommunikationsanlage (ISDN-NStAnl)
TKO	Telekommunikationsordnung
TLD	Top-Level Domain
TlnKg	Teilnehmerkennung
TM	Traffic Management
TP	Twsted Pair (verdrillte Leitung)
TS	Telekom Service
TS	Traffic Shaping
TTY	Teletype (Telex)
TUC	Total User Cell count
TUCD	Total User Cell Difference
TUNIC	TCP/UDP over Non-existent IP Connections
TVSt	Teilnehmervermittlungsstelle

UART	Universal Asynchronous Receiver/Transmitter
UBR	Unspecified Bit Rate
UDP	User Datagram Protocol
ÜP	Übergabepunkt
UME	UNI Management Entity (used in ILMI Definition)
UMTS	Universal Mobile Telecommunication System
UMTS	Universal Mobile Telecommunications System
UNC	Universal Naming Convention (z.B. \\Server1\C\Datei.txt)
UNI	User-to-Network Interface
UP	Unterputz
UPC	Usage Parameter Control
UPS	Uninterruptable Power Supply (deutsch: USV)
URL	Universal Resource Locator (Internet-Adresse)
USB	Universal Serial Bus
USITA	United States Independent Telephone Association
USTA	United States Telephone Association
USTSA	United States Telecommunications Suppliers Association
USV	Unterbrechnungsfreie Stromversorgung
UT	Universal Time (Weltzeit, GMT)
UTP	Unshielded Twisted Pair (ungeschirmte verdrillte Leitung)
VA	Voltampere
VAT	Visual Audio Tool
VBR	Variable Bit Rate
VC	Virtual Circuit
VCC	Virtual Channel Connection
VCFC	Virtual Channel Flow Control
VCI	Virtual Channel Identifier
VCL	Virtual Channel Link (UNI 3.0)
VDo	Verbinderdose
VDSL	Very High Speed Digital Subscriber Line
VDT	Video Display Terminal
VF	Voice Frequency
VFD	Vacuum Fluorescent Display
VGA	Video Graphics Array
VIC	Video Conferencing
VINCE	Vendor Independent Network Control Entity
VLAN	Virtual LAN
VLSM	Variable length Subnet Mask
VLV	Very Low Voltage
VNK	Vermittelnder Netzknoten (digitale VSt)
VoD	Video on Demand
VoIP	Voice over IP
VP	Virtual Path
VPC	Virtual Path Connection
VPCI	Virtual Path Connection Identifier
VPI	Virtual Path Identifier
VPL	Virtual Path Link
VPN	Virtual Private Network (private Verbindung via Internet)
VPT	Virtual Path Terminator (UNI 3.0)
VS/VD	Virtual Source/Virtual Destination
VS	Virtual Subnet
VSAT	Very Small Aperture Terminal
VSt	Vermittlungsstelle
VTOA	Voice and Telephony over ATM
VW	Vorwähler
VxD	Virtual Device Driver (Windows), z.B. VKD=Keyboard-Treiber

W-CDMA	Wideband Code Division Multiple Access
WAN	Wide Area Network
WAP	Wireless Application Protocol
WECO	Western Electric Company
WFQ	Weighted Fair Queuing
WID	Wireless Information Devices
WINS	Windows Internet Naming Service (f. NetBIOS über TCP/IP)
WipLL	Wireless Internet Protocol Local Loop
WM	Western Modular
WWW	World Wide Web

XC	Cross Connect

YUV	TV color Scheme
ZG	Zusatzgerät

ZVStW	Zentralvermittlungsstellenwähler
ZZF	Zentralamt für Zulassungen im Fernmeldewesen (heute BZT)
ZZK	Zentraler Zeichenkanal