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Preliminary 802.11n working became available in many routers in 2008. This technology can use multiple antennas to target one or more sources to increase speed. This is known as MIMO, Multiple Input Multiple Output. In tests, the speed increase was said to only occur over short distances rather than the long range needed for most point-to-point ...
An 802.11n-only network may be impractical for many users because they need to support legacy equipment that still is 802.11b/g only. In a mixed-mode system, an optimal solution would be to use a dual-radio access point and place the 802.11b/g traffic on the 2.4 GHz radio and the 802.11n traffic on the 5 GHz radio. [20]
Wireless Sensor Networks (WSN / WSAN) are, generically, networks of low-power, low-cost devices that interconnect wirelessly to collect, exchange, and sometimes act-on data collected from their physical environments - "sensor networks". Nodes typically connect in a star or mesh topology.
The 802.11ac wireless LAN standard was proposed to deliver speeds of 1 Gbit/s and faster. Development of the specification began in 2011 and is expected to be completed by 2014. 802.11ac uses the 5 GHz band, defines channels up to 160 MHz wide, supports up to 8 simultaneous MIMO data streams, and delivers raw data rates up to nearly 7 Gbit/s. [81]
802.11-1997 was the first wireless networking standard in the family, but 802.11b was the first widely accepted one, followed by 802.11a, 802.11g, 802.11n, 802.11ac, and 802.11ax. Other standards in the family (c–f, h, j) are service amendments that are used to extend the current scope of the existing standard, which amendments may also ...
Frequency range, or type PHY Protocol Release date [1] Frequency Bandwidth Stream data rate [2] Max. MIMO streams Modulation Approx. range Indoor Outdoor (GHz) (MHz)
Such modes are generally incompatible with each other, nor with standard 802.11 clients. These modes are frequently used for long-range dedicated links and/or by wireless Internet service providers , as they by design avoid the hidden node problem present in regular (CSMA/CD) Wi-Fi links.
Every single review of 802.11n equipment (whatever the draft) states that 802.11n falls far short of its nominal specifications. In fact, most reviews have found that 802.11n lags even behind the standard it was supposed to replace, 802.11g, in range as well as speed. So, in the end, what is the point in having this standard? And why has it ...