MSDU format

5.1.4 MSDU format
This standard is part of the IEEE 802 family of LAN standards, and as such all MSDUs are LLC PDUs as
defined in ISO/IEC 8802-2: 1998. In order to achieve interoperability, implementers are recommended to
apply the procedures described in ISO/IEC Technical Report 11802-5:1997(E) (previously known as IEEE
Std 802.1H-1997 [B21]), along with a selective translation table (STT) that handles a few specific network
protocols, with specific attention to the operations required when passing MSDUs to or from LANs or
operating system components that use the Ethernet frame format. Note that such translations may be
required in a STA.
5.1.5 MAC data service architecture
The MAC data plane architecture (i.e., processes that involve transport of all or part of an MSDU) is shown
in Figure 5-1. During transmission, an MSDU goes through some or all of the following processes: MSDU
rate limiting, aggregate MSDU (A-MSDU) aggregation, frame delivery deferral during power save mode,
sequence number assignment, fragmentation, encryption, integrity protection, frame formatting, and