H3C Technologies H3C MSR 50 - Manual (Page 3)

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Access controller (AC)
An AC can control and manage all APs in a WLAN. The AC communicates with an authentication server
for WLAN client authentication.
Fat AP
A fat AP controls and manages all associated wireless stations and bridges frames between wired and
wireless networks.
SSID
Service set identifier. A client scans all networks at first, and then selects a specific SSID to connect to a
specific wireless network.
Wireless medium
A medium that is used for transmitting frames between wireless clients. Radio frequency is used as the
wireless medium in the WLAN system.
Distribution system
A distribution system is used to forward frames to their destinations. It is the backbone to transmit
frames between access points.
Split MAC
In split MAC mode, APs and ACs manage different services. An AP manages real-time services, such
as beacon generation, power management, fragmentation and defragmentation. An AC manages
services related to packet distribution, association, dissociation and reassociation.
Client Access
A client access process involves three steps: active/passive scanning, authentication and association.
Figure 1-1 Establish a client acces
Scanning
1) Active scanning