3Com 3CRGPOE10075-US User Guide - Page 129

Wireless LAN Basics, Wireless Modes, Ad Hoc Mode, Infrastructure Mode, SSID/ESSID, BSS/SSID, IRELESS

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C WIRELESS LAN BASICS This appendix provides basic information on wireless local networks. Other terms related to wireless networks that are not included in this appendix can be found in the Glossary starting on page 143. Wireless Modes There are two modes in which wireless local networks can operate: ■ Ad hoc mode ■ Infrastructure mode Ad Hoc Mode Ad hoc mode does not require an Access Point or a wired local network. Wireless stations (for example, notebook with wireless cards installed) can communicate directly with each other. Infrastructure Mode In infrastructure mode, one or more Access Points are used to connect wireless stations to a wired local network. The wireless stations that are associated with the Access Point can access all resources on the local network. Access Points can only function in infrastructure mode and can communicate only with wireless stations that are set to infrastructure mode. SSID/ESSID BSS/SSID A group of wireless stations and a single Access Point, all using the same ID (SSID), form a Basic Service Set (BSS). Using the same SSID is essential. Wireless devices that use different SSIDs may not be able to communicate with each other. However, some Access Points allow connections from wireless stations that have their SSID set to any or whose SSID is blank (null).

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C
W
IRELESS
LAN B
ASICS
This appendix provides basic information on wireless local networks.
Other terms related to wireless networks that are not included in this
appendix can be found in the
Glossary
starting on
page 143
.
Wireless Modes
There are two modes in which wireless local networks can operate:
■
Ad hoc mode
■
Infrastructure mode
Ad Hoc Mode
Ad hoc mode does not require an Access Point or a wired local network.
Wireless stations (for example, notebook with wireless cards installed) can
communicate directly with each other.
Infrastructure Mode
In infrastructure mode, one or more Access Points are used to connect
wireless stations to a wired local network. The wireless stations that are
associated with the Access Point can access all resources on the local
network.
Access Points can only function in infrastructure mode and can
communicate only with wireless stations that are set to infrastructure
mode.
SSID/ESSID
BSS/SSID
A group of wireless stations and a single Access Point, all using the same
ID (SSID), form a Basic Service Set (BSS).
Using the same SSID is essential. Wireless devices that use different SSIDs
may not be able to communicate with each other. However, some Access
Points allow connections from wireless stations that have their SSID set to
any
or whose SSID is blank (null).