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ACS: Auto-Configuration Server
ACT: Application Context Transfer
ADAE: Application Data Analytics Enablement
ADAEC: Application Data Analytics Enabler Client
ADAES: Application Data Analytics Enablement Services
ADC: Analog-to-Digital Converter
ADF: Accounting Data Forwarding function block
ADMF: LI Administration Function
ADN: Abbreviated Dialling Number
ADR: Accumulated Delta-Range
ADRF: Analytics Data Repository Function
ADU: Application Data Unit
AE: Authentication Extension
AEAD: Authenticated Encryption with Associated Data
AEF: API Exposing Function
AES: Advanced Encryption Standard
AF: Application Function
AF/AS: Application Function / Application server
AF_ID: Application Function Identity
AGC: Automatic gain control
AGV: Automated Guided Vehicle
AGW: Access GateWay
AI: Artificial Intelligence
AI/ML: Artificial Intelligence / Machine Learning
AICH: Acquisition Indicator CHannel
AID: Application Identifier
AILC: Assistance Information bit for Local Cache
AK: Anonymity Key
AKA: Authentication and Key Agreement
AKMA: Authentication and Key Management for Applications
AL: Aggregation level
AL FEC: Application Level FEC
AL-SDU: Application Layer - Service Data Unit
ALR: Area Loss Rate
ALW: ALWays
AM: Acknowledged Mode
AMBR: Aggregated Maximum Bitrate
AMC: Adaptive Modulation and Coding
AMD: AM Data
AMF: Access Management Function
AMN: Artificial Mains Network
AMR: Adaptive Multi Rate
AMR-NB: Adaptive Multi-Rate - NarrowBand
AMR-WB: Adaptive Multi Rate – Wide Band
AMR-WB IO: Adaptive Multi-Rate - WideBand Inter-operable Mode, included in the EVS codec
AN: Access Network
ANBR: Access Network Bitrate Recommendation
ANBRQ: Access Network Bitrate Recommendation Query
ANDS: Access Network Discovery and Selection
ANDSF: Access Network Discovery and Selection Function
ANDSF-SN: Access Network Discovery and Selection Function Server Name
ANDSP: Access Network Discovery and Selection Policy
ANID: Access Network Identity
ANL: Autonomous Network Level
ANM: ANswer Message
ANQP: Access Network Query Protocol
ANR: Automatic Neighbour Relation
AOA: Azimuth angle Of Arrival
AOC: Advice Of Charge
AOD: Azimuth angle Of Departure
AOI: Area of Interest
AOMT: AS-Originated Mobile-Terminated
AP: Access Point
APC: Antenna Phase Center
APCO: Additional Protocol Configuration Options
APF: API Publishing Function
API: Application Program Interfaces
APN: Access Point Name
APN-AMBR: APN Aggregate Maximum Bit Rate
APN-NI: APN Network Identifier
APN-OI: Access Point Name Operator Identifier
APNS: Apple Push Notification Service
APP: APPlication-defined RTCP packet
AR: Augmented Reality
ARA: Aggregated RUCI Report Answer
ARF: Augmented Reality Framework
ARFCN: Absolute Radio Frequency Channel Number
ARP: Antenna Reference Point
ARPF: Authentication credential Repository and Processing Function
ARPI: Additional RRM Policy Index
ARQ: Automatic Repeat Request
ARR: Aggregated RUCI Report Request
AR/MR: Augmented Reality / Mixed Reality
AS: Access Stratum or Application Server
AS layer: Access Stratum layer
ASA: Azimuth angle Spread of Arrival
ASCI: Advanced Speech Call Items, including VGCS, VBS and eMLPP
ASCII: American Standard Code for Information Interchange
ASCS: Adjacent Subcarrier selectivity
ASD: Azimuth angle Spread of Departure
ASIC: Application-Specific Integrated Circuit
ASK: Amplitude-shift keying
ASL: Active Speech Level
ASM: Application Service Management
ASME: Access Security Management Entity
ASN.1: Abstract Syntax Notation One
ASP: Application Service Provider
ASTC: Adaptive Scalable Texture Compression
ASTI: Access Stratum Time distribution
AT: ATtention; this two-character abbreviation is always used to start a command line to be sent from TE to TA