Warning, this page is obsolete. Provided for historic interest only.
Adrian P Stephens, 2008-08-01
IEEE 802.11 WG Vice Chair
IEEE Std 802.11-1997 specifies a single Medium Access Control (MAC) sub layer and 3 Physical Layer Specifications.
The MAC provides the following services:
Stations can operate in two configurations:
The standard provides the above mentioned services with the following functionality: roaming within a ESS, multiple data rates in BSSs and Power Management (stations can switch off their transceivers to conserve power).
The MAC protocol is Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA).
The standard includes a formal description of the MAC protocol using the SDL method standardized by the International Telecommunications Union, Section Telecommunication (ITU-T, formerly CCITT)
The standard provides 2 Physical layer specifications for radio, operating in the 2 400 - 2 483.5 MHz band (depends on local regulations) and one for infrared.
Frequency Hopping Spread Spectrum Radio PHY. This PHY provides for 1 Mbit/s (with 2 Mbit/s optional) operation. The 1 Mbit/s version uses 2 level Gaussian Frequency Shift Keying (GFSK) modulation and the 2 Mbit/s version uses 4 level GFSK.
Direct Sequence Spread Spectrum Radio PHY. This PHY provides both 1 and 2 Mbit/s operation. The 1 Mbit/s version uses Differential Binary Phase Shift Keying (DBPSK) and the 2 Mbit/s version uses Differential Quadrature Phase Shift Keying (DQPSK).
Infrared PHY. This PHY provides 1 Mbit/s with optional 2 Mbit/s. The 1
Mbit/s version uses Pulse Position Modulation with 16 positions (16-PPM) and the 2 Mbit/s
version uses 4-PPM.
For more details, look at our tutorial.
Each PHY specification includes state diagrams to formally describe the protocols.
It may therefore contain information that has since been changed in the standard
The following presentations are files in PDF format. (see below)
A viewer and printer for files in PDF format is available, free of charge, from Adobe look for acrobat reader for your platform.
IEEE Std 802.11-1997 should now be available.
A revised version of IEEE Std 802.11-1997 will be submitted to the September meeting of RevCom as a Proposed ANSI/IEEE Standard. The same document has been adopted by ISO/IEC JTC1/SC6 (the committee of the International Standards Organization / International Electrical Committee responsible for data communication) as International Standard 8802-11. The plan calls for publication of the combined document in October 1998, if the Standards Board approves the proposal.
In the mean time, the Working Group has selected the Harris/Lucent Technologies modulation scheme as the basis for their work on higher data rates in the 2.4 GHz band (project 802.11b, handled by TGb) and has selected the NTT/Lucent Technologies modulation scheme as the basis for their work on higher data rates in the 5 GHz band (project 802.11a handled by TGa).
Project 802.11c, a supplement to 802.1d to support 802.11 frames, has sent their output to the September meeting of RevCom as a Proposed ANSI/IEEE Standard. The supplement is a set of instruction what to change to in the base standard. As such it will NOT be published as a separate document. If approved by the Standards Board, the changes will be reflected in the next issue of ISO/IEC 15802-3, which is the combined IEEE/ANSI and ISO/IEC version of the IEEE standard.
Refer to Study Group.
For the future Plenary meetings, look at the 802 meeting plan.
Currently, IEEE P802.11 has 98 voting members, 19 nearly-voting members and 57 aspirant voting members. (for information about the categories of members)
For more information.
This page is maintained by Vic Hayes and Stuart J. Kerry. Comments are welcome.