This MIB is intended to be implemented on Cisco's
WLAN devices that provide the wired uplink to wireless
clients through the high-throughput dot11 radios
compliant to the 802.11n specification.

The MIB describes the PHY layer parameters of the 
802.11n compliant radio interfaces.

                   GLOSSARY

Access Point ( AP )

An entity that contains an 802.11 medium access
control ( MAC ) and physical layer ( PHY ) interface
and provides access to the distribution services via
the wireless medium for associated clients.

A-MPDU

An aggregated format that consists of several MAC
Protocol Data Units being aggregated and transmitted
in one PHY Service Data Unit.

A-MSDU

An aggregated format that consists of several MAC
Service Data Units being aggregated and transmitted
in one MAC Protocol Data Unit.

Block-Ack

This refers to the acknowledgement done for all the
MPDUs in an A-MDPU.

Basic Service Set ( BSS )

The IEEE 802.11 BSS of an AP comprises of the
stations directly associating with the AP.

CSI

Channel State Information

Clear Channel Assessment ( CCA )

A technique to assess the availability of the
channel for communication purposes.

Dual CTS 

Clear-To-Send control frame is sent by the receiver
in response to the Request-To-Send (RTS) control
frame from the sender to virtually reserve the
wireless medium for data transfer.

Dual CTS mechanism is used by the AP to reserve the
wireless medium for wireless devices that do not
support STBC. 

Green Field

A mode of operation where high-throughput 802.11n
frames are transmitted without a legacy compatible
part.

Mobile Node ( MN )

A roaming 802.11 wireless device in a wireless
network associated with an access point. Mobile Node
and client are used interchangeably.

Modulation and Coding Scheme ( MCS )

This is a value that determines the modulation, coding and
number of spatial channels.  Each scheme specifies the       
modulation technique, coding rate , number of spatial
streams  etc and the corresponding data rate.

Multiple Input Multiple Output ( MIMO )

This technique advocates sending and receiving data
communication signals through multiple antennas.  MIMO
uses the multiple streams to transmit more information
and recombine the signal at the receiving end.  This
brings more reliability and significant gain over the
traditional antenna systems. 

PLCP 

PHY Layer Convergence Protocol

PMD

Physical Medium Dependent

Power Save Multi-Poll ( PSMP )

A MAC control frame that schedules the transmissions
and receptions of PSMP devices.  

Phased Coexistence Operation ( PCO )

A BSS mode with alternating 20MHz and 40MHz phases of
operation controlled by a PCO AP.

PHY Protocol Data Unit ( PPDU )

Unit of data transfer at PHY level.

Short-Guard Interval ( SG )

Space-Time Block Coding ( STBC )

By this technique, a wireless device transmits several
copies of a data stream across a series of antennas
so that the receiver can use the various received
portions of the data signal to improve reliability of
data transfer.

Reduced Inter-Frame Space ( RIFS )

A time interval between multiple transmissions of a
single transmitter used to reduce overhead and
increase network efficiency.

Zero Length Frame ( ZLF )

A PPDU carrying a PSDU of zero-length.

REFERENCE

[1] Part 11. Wireless LAN Medium Access Control ( MAC )
and Physical Layer ( PHY ) Specifications: Enhancements
for Higher Throughput

[2] Enhanced Wireless Consortium MAC Specification,
v1.24

[3] Enhanced Wireless Consortium PHY Specification,
v1.27

[4] IEEE802dot11-MIB