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121Terrestrial Trunked Radio — TETRA redirects here. For other uses, see Tetra (disambiguation) TErrestrial Trunked RAdio [ETSI EN 300 392 2 v3.2.1] (TETRA) (formerly known as Trans European Trunked RAdio ) is a specialist Professional Mobile Radio [http://www.tetra… …
122CTCSS — In telecommunications, Continuous Tone Coded Squelch System or CTCSS is a circuit that is used to reduce the annoyance of listening to other users on a shared two way radio communications channel. Where more than one user group is on the same… …
123Push to talk — (PTT), also known as Press to Transmit , is a method of conversing on half duplex communication lines, including two way radio, using a momentary button to switch from voice reception mode to transmit mode.Conventional two way radiosFor… …
124Measuring network throughput — Throughput of a network can be measured using various tools available on different platforms. This page explains the theory behind what these tools set out to measure and the issues regarding these measurements. Contents 1 Reasons for measuring… …
125Quantum channel — In quantum information theory, a quantum channel is a communication channel which can transmit quantum information, as well as classical information. An example of quantum information is the state of a qubit. An example of classical information… …
126Adaptive Huffman coding — (also called Dynamic Huffman coding) is an adaptive coding technique based on Huffman coding. It permits building the code as the symbols are being transmitted, having no initial knowledge of source distribution, that allows one pass encoding and …
127Cospas-Sarsat — Logo of Cospas Sarsat Logo as used until 1992 Cospas Sa …
128Mobile radio — This article is about professional equipment. For mobile radios used in amateur radio, see amateur radio mobile operation. Mobile radio or mobiles refer to wireless communications systems and devices which are based on radio frequencies, and… …
