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Wireless Networking Glossary

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H
H.248 ITU-T protocol to control the MGW
H.323 ITU-T recommendation for teleconferencing. See OpenH323
Half Duplex Transceiver mode wherein signals may not be received while transmitting. Signal transmission and reception usually done on same frequency. See Transceiver.
HDLC High Level Data Link Control
HDSL High bit rate DSL. Symmetric DSL used for corporate networking
Headend Facility at local cable TV office that originates and communicates TV modem services to subscribers. Includes satellite dish antenna for receiving incoming programming, Internet gateway, telephony network, or other source, and converts to laser-modulated optical signals for transmission across network to subscriber. Larger networks feature both primary headend and secondary headends or hubs.
HFC Hybrid Fiber Coax. Telecommunication technology offered by MSOs in which optical fiber cable and coaxial cable are used in different portions of a network to carry broadband content (such as video, data and voice). Broadband bi-directional shared media transmission system using fiber trunks between headend and fiber nodes, and coaxial distribution from fiber nodes to customer locations.
HINFO Host Information
HDLC High-Level Data Link Control (HDLC) is a bit-oriented synchronous data link Layer 2 protocol developed by the International Organization for Standarization (ISO).
HLPI Higher Layer Protocol Identifier
Hotspot For users of portable computers equipped for wireless, a WLAN node that provides Internet connection and VPN access from a given public location.
HSSI High Speed Serial Interface. A serial interface that can be used for very short distances (up to 50 feet), supporting speeds up to 52 Mbps
HTML Hypertext Markup Language
HTTP Hypertext Transfer Protocol. For transferring files (text, graphic images, sound, video, and other multimedia files) through Internet.
https Secure http
Hub Common connection point for network devices commonly used to connect segments of a LAN. Contains multiple ports. Packet arrives at one port, copied to other ports so that all LAN segments can see all packets. Usually includes switch, may include router.
Hz Cycles per second. A measure of radio frequency

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