TACS/ETACS
AMPS
The original version of this analog wireless system was commercially
developed by AT&T in 1983. This system enabled more users by utilizing
small (low power) cells, allowing frequencies to be reused. This system
also opened up the possibility of handheld phones and lower terminal
prices.
AMPS was originally an analog system operating in the 800 MHz frequency
band. However, it has since expanded to TDMA and CDMA digital operation in
the same frequency range and more recently adding a third channel in the PCS
frequency band. By using tri-band cell phones featuring one 800 MHz analog
band and two digital channels in the 800 Mhz and 1800 to 2200 Mhz bands,
these services can now offer enhanced coverage and services. The best known
AMPS systems are in the US and Canada, but AMPS is also a de facto standard
throughout Mexico, Central and South America, very common in the Pacific Rim
and also found in Africa and the remains of the USSR. In summary, AMPS is
on every continent except Europe and Antarctica. AMPS is defined not by a
single standard, but by many standards. There are other forms of cellular
and PCS in the world:
The European 900 MHz digital cellular system, which has also expanded to
many parts of the world. GSM provides intersystem operations through its own
MAP (Mobile Application Part) protocol, making its operation relatively
incompatible with the AMPS family. GSM is the biggest challenger to the AMPS
family of technologies and holds the greatest promise for offering a true
worldwide standard in cellular broadcast systems.
A Scandinavian 450/900 MHz analog cellular system, the closest thing in
Europe to a standard prior to GSM. NMT systems have been installed in
many countries outside Europe. Most NMT systems will eventually be
displaced by GSM.
AMPS with a few minor changes, operating in the 900 MHz frequency band.
The largest TACS networks are in the UK, but it has also been
installed in many other countries around the world.
Click on one of the items below to learn more.
Promotional Items
