4 High-frequency technology
High-frequency technology often used systems
for the wireless transmission information such as
voice, data video.e.3. 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. The service also used authorities and
organisations performing safety and security tasks
(BOS). GSM was intro-
duced Germany 1992.
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Chapter The internal lightning protection system
.
However, also offers the possibility circuit-
switched and packet data transport.
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. used primarily for pure tele-
phony between mobile telephone subscribers.
This third-generation standard permits transmission
speed Mbit/s with HSDPA+ 300 Mbit/s
with the fourth-generation standard, LTE (Long Term
Evolution). Possibly the best-known
application this technology navigation systems. areas with less than Mbit/s data connection.3.
TETRA/BOS
TETRA standard for digital trunked radio and
stands for “terrestrial trunked radio”.2. LTE also used for supplying broadband
data services rural regions eliminate blank spots,
i. 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. can used
for classic voice transmission but also for data, sig-
nalling and positioning services.
UMTS/LTE
The Universal Mobile Telecommunications System
(UMTS) allows much higher data rate than GSM. therefore very
versatile
