A station asking to join, stating what it supports, how long it intends to sleep, and which cipher suite it picked.
Not carried in 1 other format
he-tb — A trigger-based PPDU requires an association identifier the station does not have until this frame succeeds. (802.11-2024 §27.3.12, unverified)
No frames match. Every filter above is a set of things to include —
an empty set includes nothing. Turn some back on, or
.
Zoomed into — this layer at full
width, its components opened. Other layers are collapsed for context.
Everything here is true proportion on each lane's own
axis. Labels float above their field and step down a row only where they
would collide, so nothing is inflated to make its name fit. Zoom widens the
whole diagram together and scrolls sideways, which keeps the lanes aligned.
PHY802.11bµs
SYNC56 µsSFD16 µsHeader24 µsPSDUvariable
PLCP Header · 48 bits · b0 is the LSB, transmitted first
magnified — at true scale this sits 36.7%
into the lane and is only 12.24% of it wide
HT Capabilities Information · 16 bits · b0 is the LSB, transmitted first
magnified — at true scale this sits 78.0%
into the lane and is only 1.02% of it wide
LDPC Coding Capabilityb0Supported Channel Width Setb1SM Power Saveb2–b3HT-Greenfieldb4Short GI for 20 MHzb5Short GI for 40 MHzb6Tx STBCb7Rx STBCb8–b9HT-Delayed Block Ackb10Maximum A-MSDU Lengthb11DSSS/CCK Mode in 40 MHzb12Reservedb13Forty MHz Intolerantb14L-SIG TXOP Protectionb15
Showing through . Deeper layers are
hidden, not absent — the octets are still in the frame, and the fields
below still exist. LLC and SNAP stay visible at L2
because IEEE 802.2 LLC is the upper sublayer of the data link layer, not
something above it.
How the layers combine
Each layer names the unit it receives from above differently from the unit
the layer above hands down. They are the same octets. Nothing is added
crossing a seam — the header you see appear was always inside the slot, and
only becomes visible when the next layer subdivides it.
PPDU= SYNC + SFD + Header + PSDU
↓
the PSDU is the
MPDU —
same octets, different name
MPDU= FC + Dur + DA + SA + BSSID + SeqCtl + Body + FCS
Select any field to read what it is and why it matters.
Every field, and what contains what
The same frame as a hierarchy rather than a scale drawing. Proportion is
useful for airtime and useless for structure — a one-bit flag and a
1500-octet payload matter equally here and not at all equally above.
Structure
Every field in this transmission and what contains what — one hierarchy
from the PPDU on the air down to the application's bytes. Indentation is
containment. 106 fields, 106 unverified.