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| Could you briefly define the various wireless protocols (802.11a,b,g,n)? |
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IEEE* 802.11 Wireless Protocol Summary
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Protocol |
Frequency |
Signal |
Max. Data Rate |
|
Legacy 802.11 |
2.4 GHz |
FHSS or DSSS |
2 Mbps |
|
802.11a |
5 GHz |
OFDM |
54 Mbps |
|
802.11b |
2.4 GHz |
HR-DSSS |
11 Mbps |
|
802.11g |
2.4 GHz |
OFDM |
54 Mbps |
|
802.11n |
2.4 or 5 GHz |
OFDM |
540 Mbps (Theoretical) | |
1. Legacy 802.11
- Released in 1997
- Two raw data rates of 1 and 2 Mbps
- Frequency Hopping Spread Spectrum (FHSS) or Direct-Sequence Spread Spectrum (DSSS)
- 3 non-overlapping channels in Industrial, Scientific, Medical (ISM) frequency band at 2.4 GHz
- Originally defined Carrier Sense Multiple Access with Collision Avoidance (CSMA-CA)
- Supporting Active Intel® Adapter(s): None
2. 802.11a
- Released in 1999
- Data rates with varying modulation types: 6, 9, 12, 18, 24, 36, 48 and 54 Mbps
- Orthogonal Frequency-Division Multiplexing (OFDM) with 52 sub-carrier channels
- 12 non-overlapping Unlicensed National Information Infrastructure (UNII) channels in 5 GHz frequency band
- Supporting Active Intel Adapter(s)
- Intel® Wireless WiFi Link 4965AGN
- Intel® PRO/Wireless 3945ABG Network Connection
- Intel® PRO/Wireless 2915ABG Network Connection
3. 802.11b
- Released in 1999
- Data rates with varying modulation types: 1, 2, 5.5 and 11 Mbps
- High-Rate Direct-Sequence Spread Spectrum (HR-DSSS)
- 3 non-overlapping channels in Industrial, Scientific, Medical (ISM) frequency band at 2.4 GHz
- Supporting Active Intel Adapter(s)
- Intel Wireless WiFi Link 4965AGN
- Intel PRO/Wireless 3945ABG Network Connection
- Intel PRO/Wireless 2915ABG Network Connection
- Intel® PRO/Wireless 2200BG Network Connection
- Intel® PRO/Wireless 2100 Network Connection
4. 802.11g
- Released in 2003
- Data rates with varying modulation types: 6, 9, 12, 18, 24, 36, 48 and 54 Mbps; can additionally revert to 1, 2, 5.5, and 11 Mbps using DSSS and CCK
- Orthogonal Frequency-Division Multiplexing (OFDM) with 52 sub-carrier channels; backwards compatible with 802.11b using DSSS and CCK
- 3 non-overlapping channels in Industrial, Scientific, Medical (ISM) frequency band at 2.4 GHz
- Supporting Active Intel Adapter(s)
- Intel Wireless WiFi Link 4965AGN
- Intel PRO/Wireless 3945ABG Network Connection
- Intel PRO/Wireless 2915ABG Network Connection
- Intel PRO/Wireless 2200BG Network Connection
5. 802.11n
- Projected IEEE ratification Q2 2008; however, pre-11n Access Points (AP) and wireless adapters exist now
- Data rates with varying modulation types: 1, 2, 5.5, 6, 9, 11, 12, 18, 24, 36, 48, 54 Mbps; refer to table below for additional rates
- Orthogonal Frequency-Division Multiplexing (OFDM) using Multiple-Input/Multiple-Output (MIMO) and Channel Bonding (CB)
- 3 non-overlapping channels in Industrial, Scientific, Medical (ISM) frequency band at 2.4 GHz
- 12 non-overlapping Unlicensed National Information Infrastructure (UNII) channels in 5 GHz frequency band with and without CB
- Supporting Active Intel Adapter(s)
- Intel Wireless WiFi Link 4965AGN
NOTE: Intel does not currently support channel bonding for the 2.4GHz spectrum (802.11b and 802.11g).
|
Mode |
Max. Rate (Mbps) |
Antenna Transmit/Receive Arrangements |
|
Legacy a/b/g with Antenna
Diversity and CB |
121.5 |
1 Tx
1 Rx |
|
2x2 20MHz |
130 |
2 Tx
2 Rx |
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2x3 20MHz |
144.44 |
2 Tx
3 Rx |
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2x2 40MHz |
270 |
2 Tx
2 Rx |
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2x3 40MHz |
300 |
2 Tx
3 Rx | |
This applies to:
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Solution ID: CS-025321
Date Created: 27-Dec-2006
Last Modified: 24-Nov-2007
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