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Non-broadcast multiple-access network
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Non-broadcast multiple-access network : ウィキペディア英語版
Non-broadcast multiple-access network

A non-broadcast multiple access network (NBMA) is a computer network to which multiple hosts are attached, but data is transmitted only directly from one computer to another single host over a virtual circuit or across a switched fabric. NBMA networks do support multicast or broadcast traffic manually (pseudo-broadcasts). Some common examples of nonbroadcast network technologies include Asynchronous Transfer Mode (ATM), Frame Relay, X.25, and home power line networking.
== Power line networks ==
The ITU-T G.hn standard provides a specification for creating a high-speed (up to 1 Gigabit/s) local area network using existing home power lines, phone lines and coaxial cables.
Because of multipath propagation, power lines use frequency-selective channels. Channel frequency response is different for each pair of transmitter and receiver, so modulation parameters are unique for each transmitter and receiver pair. Since each pair of devices uses a different modulation scheme for communication, other devices may not be able to demodulate the information sent between them.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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