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AT-WA1004G User’s Guide
135
BSS/ESS
BSS 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. Devices with different SSIDs are unable
to communicate with each other.
ESS A group of Wireless Stations, and multiple Access Points, all using the
same ID (ESSID), form an Extended Service Set (ESS).
Different Access Points within an ESS can use different Channels. In fact,
to reduce interference, it is recommended that adjacent Access Points
SHOULD use different channels.
As Wireless Stations are physically moved through the area covered by
an ESS, they will automatically change to the Access Point which has the
least interference or best performance. This capability is called Roaming.
(Access Points do not have or require Roaming capabilities.)