Abbreviations and acronyms ACF AHDBEE ALCI ALCS ANSI APPC Advanced Communications Function APPN, HPR, DLUR, BX, EE, and EBN Airlines Line Control Interconnection Airline Control System American National Standards Institute Advanced program-to-program communication Application programming interface Advanced Peer-to-Peer Networking American National CEPT Conference of European Postal Telecommunications Administration Classical IP. Channel Interface Processor (Cisco). Communication line adapter Communication line processor Composite network node Class of service Central processing unit Circuit Switched Public Data Network Data circuit-terminating equipment Dynamic Host Configuration CIP CLA CLP CNN COS CPU CSPDN DCE DHCP API APPN ASCII