Network Capacity


Another consideration when selecting a protocol is its overall capacity. Network capacity can be expressed as the throughput multiplied by the number of available channels. Because 802.11g has access to the same three nonoverlapping channels, the only way to increase total capacity is to increase throughput on individual channels. Table A-2 shows approximate network capacities for different Wi-Fi technologies.

Table A-2. Network Capacity Comparison

Protocol

Throughput (Mbps)

Channels

Capacity (Mbps)

802.11b

6

3

18

802.11g
(with 802.11b clients)

14

3

42

802.11g
(with no 802.11b clients)

22

3

66

802.11a

25

23 (assumes the use of both indoor and outdoor channels)

575


As you can see, 802.11b clients have the lowest capacity, whereas 802.11a clients have almost 32 times as much capacity. As you can see in the next section, however, there is a tradeoff in ranges when it comes to these technologies.




Cisco 802.11 Wireless Networking Quick Reference
Cisco 802.11 Wireless Networking Quick Reference
ISBN: 158705227X
EAN: 2147483647
Year: 2005
Pages: 126

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