e.4 High-frequency technology
High-frequency technology often used systems
for the wireless transmission information such as
voice, data video.3. This section introduces several of
the best-known technologies:
GSM
GSM stands for Global System for Mobile Communic-
ations and global standard for all-digital mobile
communications.
TETRA/BOS
TETRA standard for digital trunked radio and
stands for “terrestrial trunked radio”.
GPS
GPS, Global Positioning System, satellite sys-
tem for determining location.
SAT-TV
Like GPS, SAT-TV uses satellite system for transmis-
sion and used for transferring analogue and digital
TV programmes.
This third-generation standard permits transmission
speed Mbit/s with HSDPA+ 300 Mbit/s
with the fourth-generation standard, LTE (Long Term
Evolution).3. LTE also used for supplying broadband
data services rural regions eliminate blank spots,
i. can used
for classic voice transmission but also for data, sig-
nalling and positioning services. therefore very
versatile. GSM was intro-
duced Germany 1992.
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Chapter The internal lightning protection system
.
UMTS/LTE
The Universal Mobile Telecommunications System
(UMTS) allows much higher data rate than GSM. areas with less than Mbit/s data connection. The service also used authorities and
organisations performing safety and security tasks
(BOS).
However, also offers the possibility circuit-
switched and packet data transport. Possibly the best-known
application this technology navigation systems. receive the signals satellite dish
and LNB (Low Noise Block) are needed; the LNB
converts the frequencies from satellite transmission in-
to frequencies that can used coaxial cables. used primarily for pure tele-
phony between mobile telephone subscribers.2
