PLCP Header Header

The same forty-eight header bits as the long preamble, sent at 2 Mb/s rather than 1.

Reading a capture

Identical content, half the airtime. Note what that means for a receiver: it must switch demodulation rate partway through the preamble, at a point it only knows from having recognised the reversed delimiter above.

Where it sits

HR/DSSS PPDU (short preamble) > PLCP Header

• Open in the explorer — Ack
• Open in the explorer — Association Request
• Open in the explorer — Association Response
• Open in the explorer — Beacon
• Open in the explorer — Compressed Block Ack
• Open in the explorer — CTS
• Open in the explorer — Four-way handshake message 1
• Open in the explorer — Four-way handshake message 2
• Open in the explorer — Four-way handshake message 3
• Open in the explorer — Four-way handshake message 4
• Open in the explorer — Probe Request
• Open in the explorer — Probe Response
• Open in the explorer — ARP request in a QoS Data frame
• Open in the explorer — ICMP echo over IPv4, in a QoS Data frame
• Open in the explorer — UDP over IPv6, in a QoS Data frame
• Open in the explorer — TCP over IPv4, in a protected QoS Data frame
• Open in the explorer — TCP over IPv4, in an open QoS Data frame
• Open in the explorer — UDP over IPv4, in a QoS Data frame
• Open in the explorer — RTS
• Open in the explorer — Trigger frame

Accuracy

Clause

802.11-2024 §16.2.2

Verified

Not verified against the standard. Treat this as a claim, not a fact.