1G refers to the first generation of wireless cellular technology (mobile telecommunications). These are the analog telecommunications standards that were introduced in the 1980s and continued until being replaced by 2G digital telecommunications in the 1990s. The main difference between 1G and 2G mobile cellular systems is that the radio signals used by 1G networks are analog, while 2G networks are digital.
Although both systems use digital signaling to connect the radio towers (which listen to the handsets) to the rest of the telephone system, the voice itself during a call is encoded to digital signals in 2G whereas 1G is only modulated to higher frequency, typically 150 MHz and up. The inherent advantages of digital technology over that of analog meant that 2G and later networks eventually replaced them everywhere. The predecessor to 1G technology is the mobile radio telephone, retroactively referred to as "0G".
Deployment
One such standard is Nordic Mobile Telephone (NMT), used in Nordic countries, Switzerland, the Netherlands, Eastern Europe and Russia. Others include Advanced Mobile Phone System (AMPS) used in North America and Australia,[1] TACS (Total Access Communications System) in the United Kingdom, C-450 in West Germany, Portugal and South Africa, Radiocom 2000 in France, TMA in Spain, and RTMI in Italy. In Japan there were multiple systems. Three standards, TZ-801, TZ-802, and TZ-803 were developed by NTT (Nippon Telegraph and Telephone)[2] while a competing system operated by Daini Denden Planning, Inc. (DDI)[2] used the Japan Total Access Communications System (JTACS) standard.
Apple never shipped a phone for the 1G standard as the first iPhone started with support for GPRS and EDGE, based on advanced versions of the 2G standard.
References
- ↑ AMTA. amta.org.au. Archived from the original on 17 April 2008.
- ↑ 2.0 2.1 Answers - The Most Trusted Place for Answering Life's Questions. Answers.com.
External links
- What is the difference between 3G, 4G and 5G? at Verizon (2019-11-18)
- 1G at Wikipedia
