Over the last ten years, the impact of wireless communications on
the way we live and do business has been surpassed only by the impact
of the Internet. Cell phones, pagers, and wireless Personal Digital
Assistants (PDAs) have become so commonplace in our lives that it is
easy to forget that ten years ago, they were a rarity. But wireless communications
is still in its infancy, and the next stage of its development will
be in supplementing or replacing the network infrastructure that was
traditionally “wired” as well as enabling network infrastructures that previously
could only be imagined. From local coffee shops to commercial
inventory control systems, within restaurants and throughout public airports,
accessing central pools of information and communicating directly
between users and among the devices themselves, wireless commerce is
beginning to challenge the exchange system that our modern world
currently embraces.
No longer are we restricted by the shortfalls of processing and
battery power, operating system efficiencies, or heat dissipation within
the small footprint of the mobile device. Rather, we are limited only by
the practical application of these technologies. How will we access information?
How will we integrate multiple hardware and software technologies
into intelligent and useable form factors? Not all business
models necessarily imply the use of a single terminal to supply the user
with voice, video, and data services. Ergonomic factors may dictate that
voice services are maintained privately while data exchange and video
information is easily viewable from a specified distance, perhaps on
complementary devices.
the way we live and do business has been surpassed only by the impact
of the Internet. Cell phones, pagers, and wireless Personal Digital
Assistants (PDAs) have become so commonplace in our lives that it is
easy to forget that ten years ago, they were a rarity. But wireless communications
is still in its infancy, and the next stage of its development will
be in supplementing or replacing the network infrastructure that was
traditionally “wired” as well as enabling network infrastructures that previously
could only be imagined. From local coffee shops to commercial
inventory control systems, within restaurants and throughout public airports,
accessing central pools of information and communicating directly
between users and among the devices themselves, wireless commerce is
beginning to challenge the exchange system that our modern world
currently embraces.
No longer are we restricted by the shortfalls of processing and
battery power, operating system efficiencies, or heat dissipation within
the small footprint of the mobile device. Rather, we are limited only by
the practical application of these technologies. How will we access information?
How will we integrate multiple hardware and software technologies
into intelligent and useable form factors? Not all business
models necessarily imply the use of a single terminal to supply the user
with voice, video, and data services. Ergonomic factors may dictate that
voice services are maintained privately while data exchange and video
information is easily viewable from a specified distance, perhaps on
complementary devices.
As network engineers, we will be charged with the seamless distribution
of information between seemingly incompatible software and hardware
standards. In addition, we will be challenged by narrower
bandwidths to develop highly efficient means of transport in order to
fully leverage wireless technologies.This book is meant as both a primer
for wireless technologies and as a guide on how to design and implement
a wireless data network.
We’ve written this book for our peers in the IT community with
the hope that we can save them some of the “ramp-up” time we’ve
invested over the last several years in designing and working with wireless
networks.While no previous wireless, IP, or design experience is
required to understand this book, some knowledge in all three areas is
recommended. Upon completion of this book, you should have a good
understanding of:
How wireless communication works.
The physics behind wireless communications.
What components make up a wireless network.
The Transmission Control Protocol/IP (TCP/IP) and how it
relates to the conventions of the Open Systems Interconnection
(OSI) Reference Model.
The various wireless technologies available today.
The methodologies used to design and implement a wireless
network.
In laying a foundation for understanding these concepts, the construct
of this book provides the reader with historical references as well
as applicable case studies. Due to the vast differences between the types
of wireless networks, we have tried to keep our design recommendations
at a high-level.
Chapter 1 covers the history of wireless communications. It starts
at the discovery of electro-magnetism and takes you through the technology
developments leading up to the present day. Following the historical
overview, we discuss the applications that operate over wireless
technologies and the markets where wireless networking is becoming
more prevalent.
Chapter 2 moves into the detailed physics behind wireless communications.
It also covers the various components that make up wireless networks,
including base stations, and antennas.This chapter will provide
you with the level of understanding necessary to be able to better
understand how wireless communication devices operate. Following the
discussion on network components, we discuss some of the regulations
involved with wireless communications.When building a wireless network,
it is important to know and understand what regulations you
possibly have to follow.
Chapter 3 departs from wireless and switches gears to TCP/IP.When
designing and implementing networks today, it is important to have a
good understanding of the network layer protocol that will run over
them.The most popular network protocol today is TCP/IP.This chapter
will cover both the OSI model and the TCP/IP protocol suite, identifying
specific examples and correlations to wireless networking. Due to
the complexity of both of these topics, this chapter is simply an
overview of each and is meant as only an introduction.
Chapter 4 identifies some of the many wireless-networking technologies.
From Bluetooth to LMDS to 802.11, this chapter explains the
workings of the most popular technologies today.The chapter covers
four functional wireless areas including:
Fixed Wireless Technologies
Mobile Wireless Technologies
Wireless LANs and PANs
Optical Wireless Technologies
The emphasis of this chapter is on Wireless LANs, since it is prevalent
in both business and residential markets today.
Chapter 5 teaches the design methodologies used by Lucent
Technologies Enhanced Services and Sales, the professional services and
consulting division of Lucent Technologies. It begins by exploring the
design process, moving into specific wireless considerations in the design
process. Next it details the design process with a high-level overview,
followed by implementation considerations and documentation.
Chapters 6 through 9 are detailed case studies of fictional wireless
projects based on the authors experience in the real world.The four
studies include:
An Industrial/Retail Case Study
A Hospital Case Study
A College Campus Case Study
A Home/Personal Case Study
Each case study is a design project from inception to completion.
While each one is unique, they all contain the same components of
wireless networking and design. Each case study will be presented in a
different manner, from simple story-based to detailed engineering-based.
The case studies are used as a hands-on guide towards building a wireless
network.
.
.
ไม่มีความคิดเห็น:
แสดงความคิดเห็น