From Packet Broadband Network Handbook
| AAA | authentication, authorization, and accounting | |
| AAL | ATM Adaptation Layer | |
| AAL1 | ATM Adaptation Layer 1 | |
| AAL2 | ATM Adaptation Layer 2 | |
| AAL3/4 | ATM Adaptation Layer 3/4 | |
| AAL5 | ATM Adaptation Layer 5 | |
| ABM | asynchronous balanced mode | |
| ABNF | augmented Backus-Naur form | |
| ABR | available bit rate | |
| ACL | asynchronous connectionless | |
| ADSL | asynchronous digital subscriber loop | |
| AESA | ATM end system address | |
| AFI | authority and format identifier | |
| AH | Authentication Header | |
| AIS | alarm indication signal | |
| AMI | Alternate Mark Inversion | |
| AMPS | advanced mobile phone service | |
| A node | asynchronous node (HomeRF) | |
| ANSI | American NationalStandards Institute | |
| AP | access point | |
| ARIS | aggregate route-base IP switching | |
| ARL | average ring length | |
| ARM | asynchronous response mode | |
| ARP | Address Resolution Protocol | |
| ARPANET | Advanced Research Projects Agency Network | |
| AS | autonomous system | |
| ASCII | American Standards Committee for Information Exchange | |
| ASIC | application-specific integrated circuit | |
| ASIU | ATM satellite interworking unit | |
| ASK | amplitude shift keying | |
| ATM | asynchronous transfer mode | |
| ATMARP | ATM Address Resolution Protocol | |
| AUI | attachment unit interface | |
| BECN | backward explicit congestion notification | |
| BER | bit error rate | |
| BGP | Border Gateway Protocol | |
| BICC | Bearer Independent Call Control | |
| BICI | Broadband Inter-carrier Interface | |
| B-ISDN | broadband ISDN | |
| B-ISUP | broadband ISDN service user part | |
| BITS | building integrated timing supply | |
| BLES | broadband LES | |
| BLSR | bidirectional line-switched rings (SONET) |
| BPSK | binary phase-shift keying | |
| BRAN | Broadband Radio Access Network (ETSI) | |
| BRI | basic rate interface |
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