Supported Channel Width Set

MAC 1 bit HT Capabilities element unverified

Clear for 20 MHz only; set for 20 and 40 MHz.

Reading a capture

One bit that doubles the available throughput and halves the number of non-overlapping channels. In 2.4 GHz it is the bit behind most self-inflicted interference.

Where it sits

HT Capabilities > HT Capabilities Information > Supported Channel Width Set

Open in the explorer — Association Request
Open in the explorer — Association Response
Open in the explorer — Probe Request
Open in the explorer — Probe Response

Accuracy

Clause: 802.11-2024 §9.4.2.55.2
Verified: Not verified against the standard. Treat this as a claim, not a fact.