radio relay communication line
21Invention of radio — Great Radio Controversy redirects here. For the album by the band Tesla, see The Great Radio Controversy. Contents 1 Physics of wireless signalling 2 Theory of electromagnetism …
22Near field communication — An NFC enabled mobile phone interacting with a SmartPoster Near field communication, or NFC, allows for simplified transactions, data exchange, and wireless connections between two devices in proximity to each other, usually by no more than a few …
23Internet Relay Chat — IRC redirects here. For other uses, see IRC (disambiguation). For IRC channels dedicated to Wikipedia, see Wikipedia:IRC Internet Relay Chat (IRC) is a protocol for real time Internet text messaging (chat) or synchronous conferencing.[1] It is… …
24Semaphore line — This article is about the communication system using towers with pivoting shutters. For other uses, see Semaphore (disambiguation). For the now closed railway in Adelaide, Australia, see Semaphore railway line, Adelaide. A Chappe telegraph at… …
25Shortwave radio — Shortwave can also refer to a shortwave trough meteorology. A solid state, analog shortwave receiver Shortwave radio refers to the upper MF (medium frequency) and all of the HF (high frequency) portion of the radio spectrum, between… …
26satellite communication — Introduction in telecommunication, the use of artificial satellites to provide communications links between various points on Earth (Earth satellite). Communications satellites relay voice, video, and data signals between widely separated fixed… …
27Asymmetric Digital Subscriber Line — Pile de protocoles 7.  Application 6.  Présentation 5.  Session 4.  Tr …
28Asymetrical Digital Subscriber Line — Asymmetric Digital Subscriber Line Pile de protocoles 7 • Application 6 • Présentation 5 • Session 4 • …
29Secure communication — includes means by which people can share information with varying degrees of certainty that third parties cannot know what was said. Other than communication spoken face to face out of possibility of listening, it is probably safe to say that no… …
30Two-way radio — receiver which only receives content. Two way radios are available in mobile, stationary base and hand held portable configurations. Hand held radios are often called walkie talkies or handie talkies. A push to talk or Press To Transmit button is …
