Acronyms Related to Computer Networks Acronym Meaning Related subject(s) AAL ATM Adaptation Layer ATM Asynchronous Transfer Mode CDPD Cellular Digital Packet Data Wireless comm. CS Convergence Sublayer ATM sublayer DNS Domain Name Service DQDB Distributed Queue Dual Bus MAN HEC Header Error Control Data Link Layer in ATM ICI Interface Control Information IDU IDU Interface Data Unit IMP Interface Message Processor IP Internet Protocol IPX Intenet Packet eXchange Novell Netware (TM) ISDN Integrated Services Digital Network LAN Local Area Network MAN Metropolitan Area Network NAP Network Access Point NCP Network Core Protocol Novell Netware (TM) OSI Open Systems Interconnection ISO PAD Packet Assembler Dissambler PDU Protocol Data Unit PMD Physical Medium Dependent ATM sublayer PPP Point-to-Point Protocol SAP Service Access Point SAP Service Advertising Protocol Novell Netware (TM) SAR Segmentation And Reassembly ATM sublayer SDU Service Data Unit IDU SMDS Switched Multimegabit Data Service SNA Systems Network Architecture (IBM; TM) SPX Sequenced Packet eXchange Novell Netware (TM) TCP Transmission Control Protocol TIP Terminal Interface Protocol UDP User Datagram Protocol TCP/IP model WAN Wide Area Network WWW World Wide Web XNS Xerox Network System (TM)