Page 135 - DCAP104_EXPOSURE_TO_COMPUTER_DISCPLINES

Exposure to Computer Disciplines

Notes
Figure 6.17

Headquarters Regional Center
IP WAN

Rest of the world Branch Office
Telecommuter

6.5.1.5 Mobile Devices Networks

With the development of smart phones, cellular telephone networks routinely carry data in
addition to telephone conversations:
(a) Global System for Mobile Communications (GSM): The GSM network is divided into
three major systems: the switching system, the base station system, and the operation and
support system. The cell phone connects to the base system station which then connects to
the operation and support station; it then connects to the switching station where the call
is transferred to where it needs to go. GSM is the most common standard and is used for a
majority of cell phones.
(b) Personal Communications Service (PCS): PCS is a radio band that can be used by mobile
phones in North America and South Asia. Sprint happened to be the first service to set up
a PCS.

(c) D-AMPS: Digital Advanced Mobile Phone Service, an upgraded version of AMPS, is being
phased out due to advancement in technology. The newer GSM networks are replacing the
older system.

6.5.2 Uses
An embedded Router Board 112 with U.FL-RSMA pigtail and R52 mini PCI Wi-Fi card widely
used by wireless Internet service providers (WISPs) in the Czech Republic.
Wireless networks continue to develop, usage has grown in 2010. Cellular phones are part of
everyday wireless networks, allowing easy personal communications. Inter-continental network
systems use radio satellites to communicate across the world. Emergency services such as the police
utilize wireless networks to communicate effectively. Individuals and businesses use wireless
networks to send and share data rapidly, whether it be in a small office building or across the world.
Another use for wireless networks is a cost effective means to connect to the Internet, in regions
where the telecommunications infrastructure is both poor and lacking in resources, typically in
rural areas and developing countries.
Compatibility issues also arise when dealing with wireless networks. Different devices may have
compatibility issues, or might require modifications to solve these issues. Wireless networks
are often typically slower than those found in modern versions of Ethernet cable connected
installations.
A wireless network is more vulnerable, because anyone can intercept and sometimes divert a
network broadcasting signal when point to point connections are used. Many wireless networks

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