Copyright 2002 by
Prentice Hall, Inc.
Spread Spectrum LANs use RF bands that are
allocated to wireless nets by FCC, signal is spread
by transmitting a chirp pattern, receiver accepts
signals it can decode. RF-noisy environment.
Wireless LANs topologies - see Figure 6.5
1. Peer Level System: Each unit communicated with
every other unit. Low cost and no master control
Breaks down as traffic grows.
2. Centrally Controlled System (client-server):
Central controller is linked to a wired LAN.
Control unit handles all communications, and has
centralized network management and access
Wireless is the Next Frontier: