Antenna
- Bit Number
- 11
- Structure
- u8
- Unit
- antenna index
Unitless indication of the Rx/Tx antenna for this packet. The first antenna is antenna 0.
Antenna noise
- Bit Number
- 6
- Structure
- u8
- Unit
- dB
RF noise power at the antenna, decibel difference from an arbitrary, fixed reference.
Antenna signal
- Bit Number
- 5
- Structure
- u8
- Unit
- dB
RF signal power at the antenna, decibel difference from an arbitrary, fixed reference.
Channel
- Bit Number
- 3
- Structure
- u16 frequency, u16 flags
- Required Alignment
- 2
- Units
- MHz, bitmap
Tx/Rx frequency in MHz, followed by flags.
Currently, the following flags are defined:
Mask |
Meaning |
0x0010 |
Turbo Channel |
0x0020 |
CCK channel |
0x0040 |
OFDM channel |
0x0080 |
2 GHz spectrum channel |
0x0100 |
5 GHz spectrum channel |
0x0200 |
Only passive scan allowed |
0x0400 |
Dynamic CCK-OFDM channel |
0x0800 |
GFSK channel (FHSS PHY) |
FHSS
- Bit Number
- 4
- Structure
- u8 hop set, u8 hop pattern
- Units
- ??
The hop set and pattern for frequency-hopping radios.
Flags
- Bit Number
- 1
- Structure
- u8 flags
- Unit
- bitmap
Properties of transmitted and received frames.
Currently, the following flags are defined:
Mask |
Meaning |
0x01 |
sent/received during CFP |
0x02 |
sent/received with short preamble |
0x04 |
sent/received with WEP encryption |
0x08 |
sent/received with fragmentation |
0x10 |
frame includes FCS |
0x20 |
frame has padding between 802.11 header and payload (to 32-bit boundary) |
Currently unspecified but used:
Mask |
Meaning |
0x40 |
frame failed FCS check |
0x80 |
frame used short guard interval (HT) |
Lock quality
- Bit Number
- 7
- Structure
- u16
- Required Alignment
- 2
- Unit
- unitless
Quality of Barker code lock. Unitless. Monotonically nondecreasing with "better" lock strength. Called "Signal Quality" in datasheets. (Is there a standard way to measure this?)
Rate
- Bit Number
- 2
- Structure
- u8
- Unit
- 500 Kbps
TX/RX data rate.
TSFT
- Bit Number
- 0
- Structure
- u64 mactime
- Required Alignment
- 8
- Unit
- microseconds
Value in microseconds of the MAC's 64-bit 802.11 Time Synchronization Function timer when the first bit of the MPDU arrived at the MAC. For received frames only.
TX attenuation
- Bit Number
- 8
- Structure
- u16
- Required Alignment
- 2
- Unit
- unitless
Transmit power expressed as unitless distance from max power set at factory calibration. 0 is max power. Monotonically nondecreasing with lower power levels.
dB TX attenuation
- Bit Number
- 9
- Structure
- u16
- Required Alignment
- 2
- Unit
- dB
Transmit power expressed as decibel distance from max power set at factory calibration. 0 is max power. Monotonically nondecreasing with lower power levels.
dB antenna noise
- Bit Number
- 13
- Structure
- u8
- Unit
- dB
RF noise power at the antenna, decibel difference from an arbitrary, fixed reference.
dB antenna signal
- Bit Number
- 12
- Structure
- u8
- Unit
- dB
RF signal power at the antenna, decibel difference from an arbitrary, fixed reference.
dBm TX power
- Bit Number
- 10
- Structure
- s8
- Required Alignment
- 2
- Unit
- dBm
Transmit power expressed as dBm (decibels from a 1 milliwatt reference). This is the absolute power level measured at the antenna port.