Advanced Mobile Phone System
Advanced Mobile Phone Service (AMPS ) is an already somewhat older analog cellular American standard that was originally developed by the U.S. telecom monopolist AT & T.
From 1988 AMPS was developed by the Telecommunications Industry Association (TIA). AMPS is one of the first generation cellular mobile family. AMPS uses the access methods FDMA (Frequency Division Multiple Access). The high for the time of launch capacity and reliability of AMPS helped the Standard for the breakthrough and allowed American industry to export the system in many countries. AMPS uses the 800 MHz band. TACS and ETACS was derived from AMPS initially for European countries. TACS uses a different channel spacing, and the 900 MHz band. Another descendant of AMPS was JTACS, the J stands for Japan. Further developments led to NAMPS of AMPS ( Narrowband Advanced Mobile Phone Service ) which allowed an even higher capacity.
The next step was D -AMPS as a digital extension, which is also the PCS ( Personal Communication System ) frequencies in the U.S. opened in the 1900 MHz band (now PCS 1900). The development of AMPS has been largely completed with D- AMPS, an evolution to the originally derived for GSM EDGE was not completed. After the AT & T successor AT & T Wireless has decided about in 2002, to switch the entire network of AMPS to GSM with GPRS, follow virtually all existing AMPS network operator the example.
More mobile radio standards the first generation were:
- NMT in Scandinavia, later Benelux, Austria and Eastern Europe
- C network, in Germany, Portugal and South Africa
- RTMS in Italy.