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IXP400 Software
Access-Layer Components: Ethernet Database (IxEthDB) API
Programmer’s Guide IXP400 Software Version 2.0 April 2005
Document Number: 252539, Revision: 007 173
Abbreviations:
• FC - Frame Control
• DID - Duration / ID
• SC - Sequence Control
The usage of the 802.11 frame format depends heavily on the source and immediate destination for
the frame. There are four distinct possibilities:
• From STA (station) to STA.
• From STA to AP (access point).
• From AP to STA.
• From AP to AP.
The APIs in the IXP400 software focus on the two latter scenarios (AP → STA, and AP → AP).
Conceptually, the idea of the platform running IXP400 software to operate as a “Station” and also
take advantage of the 802.3 / 802.11 Frame Conversion feature has limited applicability. This
scenario would entail the platform sending or receiving 802.11 formatted frames via the Ethernet
NPE’s. Therefore the STA → STA and STA → AP modes are not discussed.
Table 31. IEEE802.11 Frame Control (FC) Field Format
1514131211109876563 2 1 0
subtype type
protocol
version
order WEP
more
data
pwr
mgr
retry
more
flag
from
DS
to DS
Figure 58. AP-STA and AP-AP Modes
IXP4XX
A
B
C
PCI
AP - STA
802.11
IXP4XX
A
B
C
PCI
802.11
AP
AP - AP
IXP4XX
NPE A
NPE B
N
PE C
PCI
AP - STA
802.11
IXP4XX
N
PE A
N
PE B
N
PE C
PCI
802.11
AP
AP - AP
B3848-001
IXP4XX
NPE A
NPE B
NPE C
PCI
802.3
AP - STA
802.11
IXP4XX
NPE A
NPE B
NPE C
PCI
802.3
802.11
AP
AP - AP
B3848-001