802.11 is Layer 2 and Layer 1. After frames come to Layer 1 from PPDU pre 802.11-2016 standard shows there are two interfaces PLCP and PMD as show below. NOTE: Per 802.11-2016 there is no longer PMD and PLCP, please read this article R.I.P. PMD by Robert Haviland explaining it really well. Since my post is very specific to CWAP – 403 Certification that is still including those two interfaces I am creating the flow accordingly for my quick reference:

PLCP actually has 3 parts Header, Preamble and PSDU (This changes in 802.11-2016 Standard)

Based on different 802.11 PHY’s, there is a quick reference chart showing different modulation and Coding along with different data rates

Modulation and Coding with Data rate for different PHY's - CWAP 403
Modulation and Coding with Data rate for different PHY’s – CWAP 403

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

WordPress SEO