ZyXEL Communications ZyAIR B-420 User Manual page 131

ZyAIR B-420 Wireless LAN Ethernet Adapter and Bridge
points can provide wireless coverage for an entire building or campus. All communications between
stations or between a station and a wired network client go through the access point.
The Extended Service Set (ESS) shown in the next figure consists of a series of overlapping BSSs (each
containing an Access Point) connected together by means of a Distribution System (DS). Although the DS
could be any type of network, it is almost invariably an Ethernet LAN. Mobile nodes can roam between
access points and seamless campus-wide coverage is possible.
Diagram D-2 ESS Provides Campus-Wide Coverage
Wireless LAN and IEEE 802.11 D-3