This was session 359 of Ferney’s free Wi-Fi design class, focusing on Wi-Fi interference terminology and concepts. Ferney explained key Wi-Fi terms including Basic Service Set (BSS), Basic Service Set Identifier (BSSID), Service Set Identifier (SSID), and Extended Service Set (ESS), demonstrating how different access points announce the same SSID using different BSSIDs. The session covered various types of Wi-Fi interference such as Co-Channel Interference (CCI), Adjacent Channel Interference, and Overlapping Basic Service Sets (OBSS), along with protection mechanisms like RTS/CTS. Ferney discussed how most Wi-Fi interference comes from other Wi-Fi networks rather than external sources, and showed examples using Wi-Fi Explorer Pro to analyze interference patterns in real networks. The class included participants from around the world including Australia, France, Sweden, Italy, Chile, Canada, and the United States, with Ferney emphasizing that all session recordings would be made available for free to help train Wi-Fi professionals worldwide.

Chat Notes:

01:29:43 simon: the channel utilization is the value of 2 AP assuming they are on the same channel or just the individual ap?

01:33:28 Hando: We need to add the gain of the antenna to the Tx power.

01:40:20 Ned Neece: If it’s an internal antenna AP, the vendor knows the gain.

01:41:47 Hando: Sure, but only the tx power is advertised, not the EIRP.

01:43:21 gurpreet singh: different vendors do it different as well, Per change conducted vs Total conducted Power.