IEEE 802.11n networks Sample Clauses

IEEE 802.11n networks. The IEEE 802.11n standard is an extension of the wireless LAN standards series in IEEE 802.11. The specification defines a network with higher throughput than was possible with the predecessors IEEE 802.11g/IEEE 802.11a (which are in turn faster than their predecessor IEEE 802.11b and the original IEEE 802.11 standard). The theoretical maximum throughput of IEEE 802.11n networks can be as high as 600 Mbit/s. This is as long as a set of assumptions is met, such as the ability to transmit independent data channels over several spatial streams simultaneously. There is no networking equipment on the market yet which supports full spatial multiplexing and it remains to be seen how much actual throughput can be reached in real-life situations. However, the increase in throughput is very significant compared to the previous standards. 600 54 54 2 11 700 600 500 400 300 200 100 0 802.11 802.11b 802.11g 802.11a 802.11n Figure 6.1: Maximum theoretical throughput on ISO/OSI Layer 2 IEEE 802.11n also deprecates older wireless LAN encryption types. A network which is operating at IEEE 802.11n speeds is not allowed to announce and process the older encryption types WEP/56, WEP/128, WPA/TKIP, WPA/AES and WPA2/TKIP; making WPA2/AES the only supported encryption type. The current version of the eduroam Service Definition states that: eduroam Service Providers MUST support IEEE 802.11b and SHOULD support IEEE 802.11g. The requirement to support IEEE 802.11b was quickly agreed to be outdated and is not enforced any more. However, hotspots that want to maintain an IEEE 802.11b service for a small fraction of users with old networking hardware are free to do so. It is understood and accepted that this small fraction of users will experience a degraded eduroam experience when travelling abroad. Their networking devices may not sense an eduroam hotspot because that hotspot does not support the slow data rates any more. A more contentious point is whether or not to require IEEE 802.11n support as a MUST, and whether or not to maintain support for IEEE 802.11g as a MUST. Note that an eduroam Service Provider which deploys only IEEE 802.11n will de facto lock out users with contemporary wireless networking hardware. Currently, IEEE 802.11n client devices are not very common yet. Therefore, a large portion of users will be left with no service at all on such a hotspot. Subsequently, it was agreed to make IEEE 802.11g support as a baseline a MUST. Service providers are free to offer ...
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Related to IEEE 802.11n networks

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