A

a
atto (10e-18)

A3
Authentication algorithmus A3

A38
Algorithmus, der sowohl die Funktion A3 als auch A8 beinhaltet

A5/1
Encryption algorithm A5/1

A5/2
Encryption algorithm A5/2

A5/X
Encryption algorithm A5/0-7

A8
Ciphering key generating algorithm A8

AAL
ATM Adaption Layer

AAL1
AAL Type 1

AAL2
AAL Type 2

AAL3/4
AAL Type 3/4

AAL5
AAL Type 5

AAPI
ATM API

AB
Access Burst

ABC
Administration and Billing Center

ABFN
Adaptive BeamForming Network

ABI
API Binary Interface

ABM
Asynchronous Balanced Mode ( HDLC )

ABR
Available Bit Rate ( ATM )

ABS
Alerting BS

AC
Access Class (C0 bis C15)

AC
Access Control ( MAC )

AC
Alternating Current

AC
Application Context

AC
Authentication Center (gemń▀ GSM-Spezifikation: AuC)

ACC
Area Communication Controller

ACC
Automatic Congestion Control

ACCH
Associated Control Channel

ACD
Automatic Call Distributor.

ACE
Antenna Coupling Equipment

ACE
Auxiliary Control Element

ACG
Auxiliary Clock Generator

ACIS
ATM Communication Interface Simulator

ACK
(positive) Acknowledgement (s. a. NACK )

ACM
Accumulated Call Meter

ACM
Address Complete Message ( GSM )

ACM
Address Complete Message

ACR
Allowed Cell Rate ( ATM )

ACT
Active

ACTS
Advanced Communication Technologies ans Services

ACU
Automatic Calling Unit.

ACU
Antenna Combining Unit

A-D
Analog-to-Digital

ADC
Administration Centre

ADC
Analog to Digital Converter/Conversion

ADCCP
Advanced Data Communication Control Procedures

ADF
Average Duration of Fades

ADH
Automatic Data Handling.

ADM
Asynchronous Disconnected Mode

ADN
Abbreviated Dialling Number

ADP
Automatic Data Processing

ADPCM
Adaptive Delta/Differential Pulse Code Modulation

ADPE
Automatic Data Processing Equipment.

AE
Application Entity

AEC
Acoustic Echo Control

AECS
Aeronautical Emergency Communications

AEF
Additional Elementary Functions

AF
Audio Frequency

AFC
Automatic Frequency Control

AFNOR
Association Franšais Normal

AGC
Automatic Gain Control

AGCH
Access Grant Channel

AIAD
Air Interface Adapter

AIG
Address Indicating Group

AIM
Amplitude Intensity Modulation

AIN
Advanced IN

AIOD
Automatic Identified Outward Dialing

AIS
Alarm Indication Signal

AIS
Automated Information System.

AKF
Autokorrelationsfunktion

ALI
Alarm and Interface Module (Siemens)

ALIB
ALI Type B (Siemens)

ALM
ATM Layer Module (Siemens)

ALU
Arithmetic and Logic Unit

AM
Amplitude Modulation

AMA
Automatic Message Accounting

AMC
administrative management complex

AME
amplitude modulation equivalent

AME
automatic message exchange

AMI
Alternate Mark Inversion

AMP
ATM Bridge Processor

AMPS
Advanced Mobile Phone System (s. a. D-AMPS )

AMPS
Advanced Mobile Phone Services

AMR
Adaptive MultiRate speech

AMU
Automatic Maintenance Unit

AMX
ATM MultipleXer

AMXE
AMX Module type E (Siemens)

ANI
Automatic Number Identification

ANSI
American National Standards Institute (USA)

ANT-COMB
Antenna Combiner

AoC
Advice of Charge

AoCC
AoC Charging supplementary service

AoCI
AoC Information supplementary service

AoCI Accounting Probe

AP
Application Part

APC
Adaptive Power Control

APC
Adaptive Predictive Coding

APD
Avalanche Photo Diode

APE
Abgesetzte Peripherie Einheit (Remote Peripheral Unit)

API
Application Programmering/Programmers Interface

API / APId
Access Point Identifier

APS
Automatic Protection Switching (u. a. bei SDH )

APS
Application Program System

ARFCN
Absolute Radio Frequency Channel Number ( GSM )

ARIB
Association of Radio Industries and Business (Japan)

ARP
Address Resolution Protocol ( IP )

ARQ
Automatic Repeat reQuest

AS
Aircraft Station

ASCI
Advanced Speech Call Items

ASCII
American Standard Code for Information Interchange

ASE
Application Service Element

ASIC
Application Specification Integrated Circuit

ASK
Amplitude Shift Keying

ASN
ATM Switching Network

ASN.1
Abstract Syntax Notation One (s. a. BER )

ASNF
ASN Module Type F (Siemens)

ASNG
ASN Module Type G (Siemens)

ASNH
ASN Module Type H (Siemens)

ASP
Adjunct Service Point (s. IN )

ASP
Application Service Provider

AST
Announcement Service Terminal

ATB
All Trunks Busy

ATDMA
Advanced TDMA

ATE
Automatic Test Equipment

ATM
Asynchronous Transfer Mode

ATM230
ATM Interface ASIC with 200- and 30-Mbit Interfaces (Siemens)

ATT (flag)
Attach

ATV
Advanced Television (s. EDTV , IDTV , HDTV )

AU
Access Unit

AU
Application Unit

AU
Administrative Unit ( SDH )

AUB
Access Unit Broadband

AuC
Authentification/Authentication Center

AUG
AU Group ( SDH )

AUT(H)
Authentication

AWGN
Additive White Gaussian Noise