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| The time now is 17.06.2024 - 02:33 |
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Post subject: Beamforming, airbeam, 802.11ac....
 Posted: 01.12.2012 - 16:30 #101789
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Majster
Joined: Júl 11, 2008
Posts: 2311
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http://www.networkworld.com/news/tech/2 ... 56707.html
About beamforming
Beamforming is a non-proprietary wireless technology that can be integrated across a range of devices, from access points to laptops to smartphones. It greatly improves wireless performance, providing a 2X-3X improvement over previous wireless solutions.
Beamforming enables this performance with an innovative approach to how wireless devices connect. In previous generations, wireless was like a lightbulb, with a hotspot or access point "radiating" wireless indiscriminately in a set area. Beamforming is like a laser -- the hub recognizes the device that needs wireless and focuses the wireless directly where it's needed -- whether it's one device or 20. Because of this novel approach, wireless can also beam around corners and through walls, eliminating previous performance obstacles encountered in large enterprise spaces.
In an enterprise environment, not all devices on the network need beamforming to reap the benefits of the technology. An access point with implicit beamforming technology can still directly "beamform" to an end device without it, enabling better performance. Inversely, a tablet with beamforming technology can better leverage the wireless signal from an access point that does not have beamforming.
Devices leveraging beamforming, from access points to end devices, have been shipping in volume since November 2010. As enterprise IT departments upgrade their infrastructure and invest in new equipment for employees, it will be beneficial to work with technology suppliers to ensure new investments boast beamforming technology.
Znie to velmi zaujimavo...
Som zvedavy na airbeam....ale vraj do dvoch rokov sa toho vo wireless vela zmeni....podstatne vyssia priepustnost, znizenie rusenia v prostredi(kvoli usmerneniu), lepsie SNR....
Pre tych co nevedia eng.... Doteraz ap funguju tak ze vysielaju urcitym smerom kde su namierene......prirovnali to k ziarovke - tak funguju dnesne wireless - ziarovka svieti vsade a stale...beamforming bude ako laser - kedy namieri presne na klienta.....Umozni to podstatne lepsi prechod cez stromy, steny...
Dosiahne sa to viacerymi subantenami...resp. castami, ktore budu samostatne vysielat a prijimat....zlepsenie bude aj ked bude oproti len jednoantenovy system kedze ap bude prijimat signal viacerymi subantenami....cim sa zlepsi priepustnost, signal...znizi sa pocet retries...
Testmi sa zlepsil signal pouzitim beamforming technologie o 12dB.... |
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Post subject: RE: Beamforming, airbeam, 802.11ac....
Posted: 01.12.2012 - 17:34 #101790
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Majster
Joined: Jan 08, 2006
Posts: 2584
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| to je sice pekne rado, ale realny produkt nie a nie prist na trh... ubnt testuje airBeam uz skoro 3 roky tusim, ale zatial ziadny badatelny progres... este by som sa radsej predcasne netesil, moze trvat este dalsich par rokov, kym bude na trhu pouzitelny produkt... |
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Post subject: RE: Beamforming, airbeam, 802.11ac....
Posted: 01.12.2012 - 17:41 #101791
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Majster
Joined: Feb 14, 2011
Posts: 2544
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cesta je to zaujimava no dodnes im poriadne nefunguje GPS sync a ako pozname UBNT tak marketing predbieha realitu o par rokov  |
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Post subject: RE: Beamforming, airbeam, 802.11ac....
Posted: 01.12.2012 - 18:25 #101792
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Majster
Joined: Júl 11, 2008
Posts: 2311
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JOFO wrote: ›to je sice pekne rado, ale realny produkt nie a nie prist na trh... ubnt testuje airBeam uz skoro 3 roky tusim, ale zatial ziadny badatelny progres... este by som sa radsej predcasne netesil, moze trvat este dalsich par rokov, kym bude na trhu pouzitelny produkt...
Jofo funguje to uz davno: Ruckus wireless ale ti za to beru obrovske prachy, ale prestrelis tym cez cely les....
http://www.muniwireless.com/2012/11/19/ ... dervalued/
http://www.xirrus.com/Products/Core-Technology/
takze uz to davno je a krasne funguje...aj cisco to ma... |
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Post subject: RE: Beamforming, airbeam, 802.11ac....
Posted: 01.12.2012 - 18:45 #101793
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Majster
Joined: Júl 11, 2008
Posts: 2311
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Post subject: RE: Beamforming, airbeam, 802.11ac....
Posted: 02.12.2012 - 17:45 #101806
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Majster
Joined: Júl 11, 2008
Posts: 2311
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http://www.cisco.com/en/US/prod/collate ... 13103.html
zaujimavy clanok o 802.11ac - ktore bude len pre 5ghz pasmo(co dufam nepovedie k uchyleniu sa vyrobcov vyrabat notebooky a home routre len v 5ghz....a zaruseniu), teoreticka rychlost pri druhej generacii bude okolo 3,5GBit/s(pri 80+80 kanali - co tiez dufam nebude nikto pouzivat...)....
Code: › Second-generation products should also come with a new technology, multiuser MIMO (MU-MIMO). Whereas 802.11n is like an Ethernet hub that can only transfer a single frame at a time to all its ports, MU-MIMO allows an AP to send multiple frames to multiple clients at the same time over the same frequency spectrum. That's right: with multiple antennas and smarts, an AP can behave like a wireless switch. There are technical constraints, and so MU-MIMO is particularly well suited to bring-your-own-device (BYOD) situations where the devices such as smartphones and tablets might only have a single antenna.
Tento odstavec hovori ze bude MU-MIMO v druhej generacii, kde ap bude v jednej chvili posielat pakety na vsetky klientske zariadenia(nieco ako multicast). Ale nepochopil som ten vyznam BOYD - vlastnych zariadeni s jednou antenou. Ako to je myslene....
Ratifikacia ma byt koncom 2013.
Zaujimalo by ma ci bude potrebna aj hardwerova zmena(ubnt, mikrotik) alebo to vyrobca dokaze upgradnut softwarom....?(ale pravdepodbne len hardwarova...)
http://www.youtube.com/watch?v=rP3ggDP_Ero
http://en.wikipedia.org/wiki/Space-divi ... ple_access |
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Post subject: RE: Beamforming, airbeam, 802.11ac....
Posted: 02.12.2012 - 23:34 #101821
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Majster
Joined: Jan 08, 2006
Posts: 2584
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podla mna to bude len HW... i ked povedzme si rovno, slo by to mozno aj SW upgradom, ale aj vyrobcovia musia z niecoho zit
je to presne ako s N-kom, na starych radiach to SW upgradom neide... |
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