Trunked Radio (TETRA)
TErrestrial Trunked RAdio (TETRA) standard was designed to meet some common requirements
and objectives of the PMR and PAMR market alike. One of the last strong holds
of analog technology in a digital world has been the area of trunked mobile radio.
Although digital cellular technology has made great strides with broad support
from a relatively large number of manufactures, digital trunked mobile radio systems
for the Private Mobile Radio (PMR) and Public Access Mobile Radio (PAMR) market
have lagged behind. Few manufacture currently offer digital systems, all of which
are based on proprietary technology. However, the transition to digital is gaining
momentum with the emergence of an open standard TETRA
is a Digital PMR Standard developed by ETSI. It is an open standard offers interoperability
of equipment and networks from different manufacturers. It is potential replacement
for analog and proprietary digital systems. Standard originated in1989 as Mobile
Digital Trunked Radio System (MDTRS), later renamed to Trans European Trunked
Radio, and is called TETRA since 1997.
Trunked Radio TETRA is the agreed standard for a new generation of digital land
mobile radio communications designed to meet the needs of the most demanding Professional
Mobile Radio networks (PMR) and Public Access Radio (PAMR) users. TETRA is the
only existing digital PMR standard defined by the European Telecommunications
Standard Institute (ETSI).
the standard's many features are voice and extensive data communications services.
Networks based on the TETRA standard will provide cost-effective, spectrum-efficient
and secure communications with advance capabilities for the mobile and fixed elements
of companies and organizations.
a standard, TETRA should be regarded as complementary to GSM and DECT. In comparison
with GSM as currently implemented, TETRA provides faster call set-up, higher data
rates, group calls and direct mode. TETRA manufactures have been developing their
products for ten years. The investments have resulted in highly sophisticated
products. A number of important orders have already been placed. According to
estimates, TETRA-based networks will have 5-10 million users by the year 2010.
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