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= Access Point =

The Access Point implementation in the Mango 802.11 Reference Design allows 802.11 stations to associate and bridge their traffic over the Ethernet port of a WARP v3 kit.

||  [[Image(wiki:802.11/files:AP_top.png, width=600)]]  ||
||  '''Top-level view of AP States'''  ||

There are three broad classes of events that pull the AP implementation out of an idle state. Those classes are:

1. Wireless MPDU Receptions
1. Ethernet Frame Receptions
1. Scheduled Events

In our implementation, each of these state transitions occurs via an interrupt.

== Wireless MPDU Receptions ==
||  [[Image(wiki:802.11/files:AP_mpdu_rx.png, width=600)]]  ||
||  '''MPDU Reception States'''  ||

When receiving a wireless MPDU, an 802.11 AP must filter on the type of packet and where it came from (i.e. transmitter address TA). In the event that the received MPDU is a data frame intended to be delivered to the wired Ethernet portal, it is passed off to the MAC High Framework's [wiki:../MACHighFramework/EthEncap Ethernet de-encapsulation] function before being transmitted via the Ethernet MAC and PHY. When a received frame is one of the many [http://en.wikipedia.org/wiki/IEEE_802.11#Management_Frames management frametypes], the AP honors the 802.11 standard's protocol for handshakes during the association process. This handshake is visualized in the above state diagram.

== Ethernet Frame Receptions ==
||  [[Image(wiki:802.11/files:AP_eth_rx.png, width=600)]]  ||
||  '''Ethernet Reception States'''  ||

== Scheduled Event ==
||  [[Image(wiki:802.11/files:AP_sched.png, width=600)]]  ||
||  '''Scheduled Events'''  ||