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58 C H A P T E R 8 Acronyms AAMI Advancement of Medical Instrumentation ACI adjacent channel interference AP access point CCA clear channel assessment CRC cyclic redundancy check DAS distributed antenna system dBm decibel-milliwatt DFS dynamic frequency selection E-UTRA evolved universal terrestrial radio access FCC Federal Communications Commission GHz gigahertz IEEE Institute of Electrical and Electronics Engineers IoT Internet of Things IP Internet protocol ISM industrial, scientific, and medical IT information technology LANs local area networks LTE-A long term evolutionâadvanced Mbps megabits per second MCS modulation and coding scheme MIMO multiple-in, multiple-out NIST National Institute of Standards and Technology OFDM orthogonal frequency-division multiplexing PBX private branch exchange QoS quality of service RF radio frequency RFID radio frequency identification SDM spatial division multiplexing SGI short guard interval SLA service level agreement SSID service set identifier STS shared tenant services TDD time-division duplexing UE user equipment VoIP voice over Internet protocol VPN virtual private network Acronyms and Definitions
Acronyms and Definitions 59 WAN wide area network WFA WiFi Alliance WiFi wireless fidelity WLAN wireless local area network WMTS wireless medical telemetry service Definitions Access Point: A bridge between a wireless medium and a wired medium. Advanced Encryption Standard: A symmetric-key encryption standard. Distributed Antenna System (DAS): An antenna system that collects wireless signals and routes them to centralized locations. Dynamic Frequency Selection (DFS): A mechanism for dynamically selecting frequencies to avoid interference sourcesâusually used in conjunction with the mechanism 802.11a-based systems used to avoid frequencies used by radar systems. Media Access Control: Part of the link layer in the open system interconnection reference model. Multiple-in, Multiple-out (MIMO): The use of multiple antennas at both the transmitter and receiver to improve communication performance. Personal Area Network: A computer network used for communication among computer devices, including telephones and personal digital assistants, in proximity to an individualâs body. Physical Interface: The Open System Interconnection Reference Model layer of a communica- tion controller that interfaces to the physical world. Quality of Service: The capability or means of providing differentiated levels of networking per- formance in terms of traffic engineering (packet delay, loss, jitter, bit rate) to different data flows. Service Set Identifier (SSID): The 802.11 term that describes a logical grouping of multiple basic service set identifiers. Unlicensed National Information Infrastructure: Unlicensed spectrum in the 5 GHz range used by IEEE 802.11an devices and wireless Internet service providers. Voice over Internet Protocol (VoIP): A technology that allows telephone calls to be made over computer networks. Wide Area Network (WAN): A communication network that spans a large geographical area, providing data transmission across metropolitan, regional, or national boundaries. Wired Equivalent Privacy: The original security mechanism of 802.11 which has been super- seded by TKIP (aka WPA) for legacy devices and AES (aka WPA2) for all 802.11-certified devices since 2006.
