Podcast
Questions and Answers
Which amendment provides a solution for connecting wireless access points over communications channels?
Which amendment provides a solution for connecting wireless access points over communications channels?
802.11ax enhances single-device communication only.
802.11ax enhances single-device communication only.
False
What is the primary focus of the 802.11r amendment?
What is the primary focus of the 802.11r amendment?
to enhance the convergence of wireless voice, data, and video
The 802.11af standard uses the recently released _____ frequency spectrum to transmit at sub-1 GHz frequency.
The 802.11af standard uses the recently released _____ frequency spectrum to transmit at sub-1 GHz frequency.
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Match the following 802.11 amendments with their features:
Match the following 802.11 amendments with their features:
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What is the primary goal of the Wireless Gigabit (WiGig) Alliance specification?
What is the primary goal of the Wireless Gigabit (WiGig) Alliance specification?
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The maximum range of WiGig is 33 feet under most conditions.
The maximum range of WiGig is 33 feet under most conditions.
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What does IEEE 802.11e primarily enhance in the 802.11 standard?
What does IEEE 802.11e primarily enhance in the 802.11 standard?
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The Enhanced Distributed Coordination Function (EDCF) allows stations with higher priority traffic to wait _____ to transmit.
The Enhanced Distributed Coordination Function (EDCF) allows stations with higher priority traffic to wait _____ to transmit.
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Match the following IEEE 802.11 standards with their primary features:
Match the following IEEE 802.11 standards with their primary features:
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Study Notes
Wireless Gigabit (WiGig) Alliance
- WiGig aims to enhance the 802.11 standard for the 60 GHz ISM band.
- Average effective range is about 6 feet, with a maximum range of 33 feet under ideal conditions.
- The 60 GHz band has 2 GHz of spectrum availability, allowing for very wide channels.
IEEE 802.11e
- Approved in November 2005 for MAC layer enhancements in 802.11.
- Designed to support Quality of Service (QoS) for LAN applications.
- Introduces acknowledgment after receiving a burst of frames for efficiency.
- Enables frame prioritization in Distributed Coordination Function (DCF) mode.
- Incorporates Enhanced DCF (EDCF) for prioritized traffic transmission.
- Introduces Hybrid Coordination Function (HCF) combining DCF and Point Coordination Function (PCF).
- Improves QoS traffic prioritization and security for mobile users.
IEEE 802.11r
- Addresses delays in association/disassociation, typically lasting hundreds of milliseconds.
- Supports voice over WLAN (VoWLAN) by providing quicker handoffs between access points.
- Enhances security during handoff processes for seamless connectivity.
- Aims to improve the integration of wireless voice, data, and video applications.
IEEE 802.11s
- Facilitates the deployment of wireless networks over large areas, like cities.
- Introduces wireless mesh networking, connecting access points wirelessly for seamless coverage.
Other Amendments Under Development
- 802.11af: Utilizes analog TV frequency spectrum for sub-1 GHz communications, offering greater range but lower data rates.
- 802.11ah: Targets low-duty-cycle devices for Internet connectivity in sub-1 GHz bands.
- 802.11ax: Focused on simultaneous communication with multiple devices using a single OFDM transmission.
- 802.11ay: Enhances 802.11ad for 60 GHz transmissions, aiming for 20-40 Gbps speeds at distances of 300-500 meters.
IEEE 802.11n Channel Configuration
- Operates in HT modes to allow coexistence with non-HT devices.
- Mode 0: Greenfield mode for HT-capable devices using 20/40 MHz channels.
- Mode 1: HT mode with protection from non-HT interference.
- Mode 2: Supports 20/40 MHz channels without additional constraints.
- Mode 3: Non-HT mixed mode for various device compatibility.
IEEE 802.11ac
- Operates exclusively in the 5 GHz band, providing broader bandwidth than previous standards.
- Supports 80 and 160 MHz channels leading to higher data rates.
- Data rates can reach up to 6.9 Gbps, significantly improved from 433 Mbps.
- Utilizes Very High Throughput (VHT) technology, capable of handling between two and eight radios per access point for multiple spatial streams.
- Implements multi-user MIMO (MU-MIMO) for parallel communication with multiple client devices.
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Description
Explore the enhancements of the 802.11 standards including WiGig, IEEE 802.11e, and IEEE 802.11r. This quiz covers key features like range, Quality of Service (QoS), and prioritization techniques. Test your knowledge on wireless communication standards and their applications.
