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页码 61
  InstantWave 
High Rate
 
11Mbps
 
Access Point  
3 
 
Planning Your Network 
Infrastructure Network Types 
An Infrastructure network is formed by several stations and one or more Access 
Points (APs), with the stations within a set distance from the AP.  Figure 1 depicts 
a typical Infrastructure network topology. 
There are three infrastructure network setups that are commonly used.  It is a good 
idea to understand the possible network setups and configuration requirements 
before planning your wireless network. 
Type 1. 
The simplest wireless infrastructure network is composed of one 
Access Point (AP) and a few wireless Stations communicating via 
radio waves (Figure 1).  This setup enables mobile stations to 
communicate with each other.  The main benefit of this type of 
network is to extend the range of the network.  If an AP is placed 
between the stations, the radio transmission distance is effectively 
doubled since Wireless Computer-1 can talk to Wireless Computer-2 
through the AP.  The drawback of this configuration is that the 
effective bandwidth is halved since all communication is relayed by 
the AP.  
 
Figure 1.   Simple Wireless Infrastructure Network 
Type 2. 
The next simplest wireless network is very similar to the Type 1 
network.  This time the AP is connected to a wired Ethernet network 
as a node.  In this configuration the AP is effectively performing as a 
bridge between the wired Ethernet and the wireless networks (Figure 
2
).   
 
Wireless users have the same access to the network resources as they 
would have if they were wired.  This type of network is usually used 
to extend an existing network into a difficult to wire or a roaming 
environment. 
Wireless 
Computer-2 
Wireless 
Computer-1 
Access Point