11Wave Technology WaveBuddy EWC-351WA1, Руководство пользователя

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2. Network Configuration and Planning
2.1 Wireless LAN Basic
A Wireless LAN is an implementation or extension of regular LAN using radio wave as the
transmission medium instead of cables. A computer equipped with a WLAN NIC is called a
WLAN Station.
A WLAN can be configured in following modes:
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Infrastructure Mode: A device called Access Point acts as the base station for WLAN
Stations. The AP is connected to a wired LAN to extend network services to WLAN
Stations. The combination of an AP and its WLAN Stations is called a Basic Service Set
(BSS). Every BSS should have a unique ID, called SSID, that is shared by the AP and its
WLAN Stations.
•
Ad-Hoc (Point-to-Point) Mode: A set of WLAN Stations can talk to each other in this
configuration. There is no need for an AP in this case. Unlike Infrastructure mode that
uses SSID to establish connections, Ad-Hoc WLAN Stations need to share the same
Channel among them. The Channel in this context is actually the radio frequency used by
the WLAN NIC.
In general, when a WLAN Station is working in Infrastructure Mode, it will scan the
neighborhood looking for an AP with the same SSID. It will then automatically switch to the
Channel used by that AP. As a result, there is no need to select the Channel on the WLAN Station
in this mode.
On the other hand, in Ad-Hoc Mode, all WLAN Stations must select a common Channel before
making the connections. SSID is irrelevant in this case.