analog cellular network
21Digital AMPS — IS 54 and IS 136 are second generation (2G) mobile phone systems, known as Digital AMPS (D AMPS). It was once prevalent throughout the Americas, particularly in the United States and Canada. D AMPS is considered end of life, and existing networks …
22Voice over Internet Protocol — (VoIP, IPAEng|vɔɪp) is a protocol optimized for the transmission of voice through the Internet or other packet switched networks. VoIP is often used abstractly to refer to the actual transmission of voice (rather than the protocol implementing… …
23Telecommunication — A parabolic satellite communication antenna at the biggest facility for satellite communication in Raisting, Bavaria, Germany …
24Channel (communications) — Old telephone wires are a challenging communications channel for modern digital communications. In telecommunications and computer networking, a communication channel, or channel, refers either to a physical transmission medium such as a wire, or …
25Femtocell — In telecommunications, a femtocell mdash;originally known as an Access Point Base Station mdash;is a small cellular base station, typically designed for use in residential or small business environments. It connects to the service provider’s… …
26History of mobile phones — This history of mobile phones chronicles the development of handheld radio telephone technology from two way radios in vehicles to handheld cellular phones.In the beginning, two way radios (known as mobile rigs) were used in vehicles such as… …
27T-Mobile USA — T Mobile USA, Inc. T Mobile USA logo, 2006–present Type Private (subsidiary of T Mobile International AG) Indu …
28T-Mobile — International AG Type Private (subsidiary of Deutsche Telekom AG) Industry Telecommunications Founded 1990 …
29Spectral efficiency — Spectral efficiency, spectrum efficiency or bandwidth efficiency refers to the information rate that can be transmitted over a given bandwidth in a specific communication system. It is a measure of how efficiently a limited frequency spectrum is… …
30Mobile telephony — Mobile phone tower Mobile telephony is the provision of telephone services to phones which may move around freely rather than stay fixed in one location. Mobile phones connect to a terrestrial cellular network of base stations (cell sites),… …
