User`s guide

Aironet Wireless Communications, Inc. 7-41 Confidential and Proprietary
To allow for protocol encapsulation changes for transmission, a transmit FID gap of six bytes must be
provided. (For FIDs with 802.3 Headers, recall that the 802.3 Header source address was reused for this
purpose). The 6 byte gap is used even for management packets and for non-ethernet payloads.
When using 802.11 headers, the host should read/write through the gap. The host must not use the offset
to jump to the payload location.
Offset Receive FID Transmit FID
Control Header
+0x00 RxTime SwSupport
+0x02
+0x04 Status Status
+0x06 PayloadLen PayloadLen
+0x08 Rsv/Signal TxControl
+0x0A Rate/Freq AID
+0x0C RxAssocCnt/Rsv TxRetries
+0x0E Rate/TxAssocCnt
+0x10 PLCP MaxLongRetry/MaxShortRetry
+0x12
802.11 Header
+0x14 FrameControl FrameControl
+0x16 Duration Duration
+0x18 Address1 Address1
+0x1A
+0x1C
+0x1E Address2 Address2
+0x20
+0x22
+0x24 Address3 Address3
+0x26
+0x28
+0x2A SeqCtl SeqCtl
+0x2C Address4 Address4
+0x2E
+0x30
Protocol GAP
+0x32 GapLen GapLen
---- Gap[ ] Gap[ ]
In AP mode, the host must read through the gap
To allow for protocol encapsulation changes for transmission, a transmit FID gap of six bytes must be
provided. (For FIDs with 802.3 Headers, recall that the 802.3 Header source address was reused for this
purpose).