|
|
发表于 2011-8-25 23:22:00
|
显示全部楼层
Chapter 1. Introduction to Wireless Networks
Over the past five years, the world has become increasingly mobile. As a result, traditional ways of
networking the world have proven inadequate to meet the challenges posed by our new collective
lifestyle. If users must be connected to a network by physical cables, their movement is dramatically
reduced. Wireless connectivity, however, poses no such restriction and allows a great deal more free
movement on the part of the network user. As a result, wireless technologies are encroaching on the
traditional realm of "fixed" or "wired" networks. This change is obvious to anybody who drives on a
regular basis. One of the "life and death" challenges to those of us who drive on a regular basis is the
daily gauntlet of erratically driven cars containing mobile phone users in the driver's seat.
We are on the cusp of an equally profound change in computer networking. Wireless telephony has
been successful because it enables people to connect with each other regardless of location. New
technologies targeted at computer networks promise to do the same for Internet connectivity. The most
successful wireless networking technology this far has been 802.11. |
|
IP卡
狗仔卡
显身卡