This PowerPoint Presentation describes about Telecommunication systems that work in Mobile Computing Technology. According to this telecommunication systems, 4 types of systems are available here. These Telecommunication Systems play an important role in Mobile Computing Technology. These are the digital Telecommunication Systems in Mobile Computing Technology

2. TITLE : MOBILE COMPUTING
STAFF NAME : V.SANTHI M.Sc.,M.Phil.,M.Tech
CLASS : I MSC COMPUTER SCIENCE
SEMESTER : II
UNIT : II
TOPIC : TELECOMMUNICATION SYSTEMS

3.  GSM
 DECT
 TETRA
 UMTS & IMT-2000

4.  Groupe Speciale Mobile(GSM) was founding in
1982.
 GSM is the most successful digital telecommunication
systems in the world today.
 It is used by over 800 million people in more than 190
countries.
 GSM is a typical second generation system, replacing
the first generation analog systems.

5. Mobile services
 GSM permits the integration of different voice and
data services and the interworking with existing
networks.
 Services make a network interesting for customers.
 GSM has define three different categories of
services:
 Bearer services
 Tele services
 Supplementary services

7.  Digital Enhanced Codeless Telecommunication is
mainly used in offices, on campus, at trade shows, or in
the home.
 DECT works at a frequency range of 1880-1990MHz
offering 120 full duplex channels.
 Time division duplex(TDD) is applied using 10ms
frames.
System architecture
Protocol architecture

8.  Terrestrial Trunked Radio in 1991 (ETSI,2002),
(TETRA MoU,2002).
 Trunked radio systems constitute another method of
wireless data transmission.
 TETRA system should replace national system, such as
MODACOM, MOBITEX and COGNITO in europe
that typically connect to an X.25 packet network.

9.  A lot has been written about third generation (or 3G)
networks in the last few years.