Wireless HT Capabilities
has sensed High Throughput (HT) 802.11n capabilities:
Supported channel width:
20MHz or 20/40Mhz
LDPC coding capability:
LDPC is an optional method for encoding/decoding 802.11n packets.
Power Save support:
Greenfield support:
Greenfield is an 802.11n only signaling mode that uses a 40MHz channel width and does not include support for legacy wireless modes (802.11a/b/d).
Short Guard Interval: The time reserved between transmitted symbols or the smallest unit of data sent at one time.
Legacy 802.11a/g devices use an 800 nSec guard interval while 802.11n devices have the ability to use a short guard interval of 400 nSec. A short guard interval can boost data rates up to 11 percent depending on the environment.
Tx and Rx Space-Time Block Coding (SPBC) support
Number of streams (antennas) for Rx STBC:
Two streams can double throughput and three streams can triple throughput over a single antenna.
HT Delayed Block ACK:
Legacy 802.11a/g transmitters expect an immediate ACK for each unicast frame. With 802.11nm receivers can send a single Block ACK to acknowledge multiple transmitted frames.
Maximum Aggregate MAC Service Data Unit (A-MSDU) length (3839 or 7935 bytes):
Legacy 802.11a/g devices can send a maximum payload of 2304 bytes per frame. Performance can be increased in 802.11n by aggregating multiple frames together during transmission.
Direct Sequence Spread-Spectrum Complementary Code Keying (DSSS/CCK) is supported 40 MHz.
Power Save Multi-Poll PSMP is supported:
A power saving technique that involves buffering frames at an Access Point until a client requests them. Typically used by WLAN headsets.
40 MHz intolerant:
Indicates that AP/Station is not tolerant of 40MHz traffic.
L-SIG TXOP Protection; Mixed Mode Format protection:
In mixed mode, each 802.11n transmission is always embedded in an 802.11a or 802.11g transmission.