miércoles, 5 de diciembre de 2012

Analog cellular networks - 1G

The first analog cellular system widely deployed in North America was the Advanced Mobile Phone System (AMPS).[20] It was commercially introduced in the Americas in 1978, Israel in 1986, and Australia in 1987.
AMPS was a pioneering technology that helped drive mass market usage of cellular technology, but it had several serious issues by modern standards. It was unencrypted and easily vulnerable to eavesdropping via a scanner; it was susceptible to cell phone "cloning;" and it used a Frequency-division multiple access (FDMA) scheme and required significant amounts of wireless spectrum to support. Many of the iconic early commercial cell phones such as the Motorola DynaTAC Analog AMPS were eventually superseded by Digital AMPS (D-AMPS) in 1990, and AMPS service was shut down by most North American carriers by 2008.

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