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AirOS » Historique » Version 57

Laurent GUERBY, 14/05/2014 16:46

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{{>toc}}
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h1. AirOS
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http://en.wikipedia.org/wiki/List_of_WLAN_channels
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http://wireless.kernel.org/en/developers/Regulatory
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http://wireless.kernel.org/en/developers/Regulatory/Database
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<pre>
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Band [MHz]	Max BW [MHz]	Flags	Max antenna gain [dBi]	Max EIRP [dBm (mW)]
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2402.000 - 2482.000	40.000		N/A	20.00 (100.00) => 80 MHz
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5170.000 - 5250.000	40.000		N/A	20.00 (100.00) => 80 MHz
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5250.000 - 5330.000	40.000	DFS	N/A	20.00 (100.00) => 80 MHz
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5490.000 - 5710.000	40.000	DFS	N/A	27.00 (501.19) => 220 MHz 
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(total 5 GHz 380 MHz, 5600-5650 = radar = 50 MHz)
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</pre>
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http://www.ubnt.com/wiki/RF_Compliance
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For example, if you select  5805 MHz (40 MHz channel) and Below, the radio will use  (5775 to 5795 MHz) + (5795 to 5815 MHz), 
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but if you select   5805 MHz (40 MHz channel) and Above, the radio will use  (5795 to 5815 MHz) + (5815 to 5835 MHz).
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ath9k http://wenku.baidu.com/view/ac0523f57c1cfad6195fa7f4.html
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Ubnt founder: http://www.forbes.com/forbes/2012/0116/entrepreneurs-robert-pera-computer-hardware-apple.html
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h2. Commandes utiles
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gestion config via ssh: http://gregsowell.com/?p=3457
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upgrade firmware via ssh: http://stfunoo.be/?p=1120
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h2. v5.3.5
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http://wiki.ubnt.com/AirOS_5.3
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Channel width 5/10/20/40
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TX power min max dBm
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Loco    4  23
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NS      8  27
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NB      4  23
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Rocket  -4 27
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LocoM2 5/10/20/40 dBm 5-23
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h2. Comparaison
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5.3.5 vs 5.5 
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Linux version 2.6.15-5.2 (buildd@builder) (gcc version 4.1.2)  Mon Dec 19 20:46:46 EET 2011  (janvier 2006)
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Linux version 2.6.32.54 (buildd@builder) (gcc version 4.1.2)  Fri Apr 6 14:56:27 EEST 2012 (decembre 2009)
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6842240 May 19 17:07 XM-v5.3.5.build11245.bin
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6472831 May 19 17:07 XM-v5.5.build12536.bin
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h2. v5.5
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http://www.ubnt.com/download#doc
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http://www.ubnt.com/downloads/guides/airOS/airOS_UG_V55_3-20-12.pdf
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Country Compliance Mode Frequency 4920 Mhz a 6100 MHz
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Channel width 3/5/8/10/20/25/30/40
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TX power min max dBm
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Loco    4  23
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NS     -4  27
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NB     -8  23
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Rocket -4  27
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LocoM2 3/5/8/10/20/25/30/40 dBm 5-23 Freq 2312 a 2732 MHz (France 5/8/10/20/30/40 et 2412-2472)
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IPv6 supported in command line ping6 fe80::xxx%br0 works
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h2. Tagger les 2 ports ethernet sur firmware 5.5:
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NB:La NS doit déjà fonctionner sans VLAN en mode bridge.
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Onglet Network:
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* Configuration Mode: Advanced
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Dans "VLAN Network":
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* Ajouter le LAN0 avec VLANID 12
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* Ajouter le LAN1 avec VLANID 12
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Dans "Bridge Network" pour le "Bridge0":
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* Supprimer LAN0
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* Supprimer LAN1
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* Ajouter LAN0.12
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* Ajouter LAN1.12
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Et appliquer la configuration.
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Voila il reste plus qu'à configurer la machine/router pour utiliser ce vlan.
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Exemple avec linux:
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<pre>
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# ip link add link eth0 name eth0.12 type vlan id 12
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# ip link set eth0.12 up
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# ping6 -c1 fe80::31%eth0.12
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PING fe80::31%eth0.12(fe80::31) 56 data bytes
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64 bytes from fe80::31: icmp_seq=1 ttl=64 time=23.5 ms
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--- fe80::31%eth0.12 ping statistics ---
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1 packets transmitted, 1 received, 0% packet loss, time 0ms
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rtt min/avg/max/mdev = 23.519/23.519/23.519/0.000 ms
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</pre>
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h2. Forums
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* http://community.ubnt.com/t5/airMAX-General-Discussion/Ubiquiti-products-700MHz-RF-leakage/m-p/797462#M40669
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** Re: Ubiquiti products 700MHz RF leakage Ubiquiti devices operate within FCC limits. It's just the second harmonic from the CPU that could cause interference for Verzion equipment. Either firmware is FCC approved
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* http://community.ubnt.com/t5/airMAX-General-Discussion/MU-MIMO/m-p/784294#M40495
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To achieve MIMO from a conventional SISO system, several technologies have been proposed.
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http://en.wikipedia.org/wiki/Beamforming
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Beamforming alters the phase of each element in an antenna array to create spatial beam patterns through constructive and destructive interference.
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http://en.wikipedia.org/wiki/Space%E2%80%93time_code
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Space-time coding/processing performs antenna diversity with multiple antennas at either transmitter or receiver side or both sides, where every antenna element is separated from its nearest element by around 4 to 10 times the wavelength to keep the signal through each multi-path independent. The distance between two adjacent antenna elements is relying on the angular spread of the beam signal.
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http://en.wikipedia.org/wiki/Multi-user_MIMO#Space-division_multiple_access_.28SDMA.29
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SDMA is a common and typical multiple input multiple output scheme in cellular wireless systems. SDMA is often referred to as simply a MIMO system since the half port of a SDMA system also consists of multiple users. Although SDMA is indeed a MIMO technique, MIMO is not necessarily SDMA.
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http://en.wikipedia.org/wiki/Spatial_multiplexing
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Spatial multiplexing is performed by multiple antennas equipped at both a transmitter and a receiver front end.
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http://en.wikipedia.org/wiki/Cooperative_wireless_communications
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Cooperation are known as network MIMO systems, distributed MIMO systems or virtual antenna array systems. Mobile devices use the partnered mobile devices' antennas, antenna arrays, or antenna elements as virtual antennas."
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proposed things despite "generalised" description in original company press-release: "MU-MIMO works by enabling simultaneous transmission to groups of clients, making better use of available WiFi network capacity and speeding up transmissions.
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also wiki-suggested articles in reference - not bad(IMO):
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http://dx.doi.org/10.1109/MSP.2007.904815
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http://dx.doi.org/10.1109/JSAC.2013.130205
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http://kth.diva-portal.org/smash/get/diva2:608533/FULLTEXT01
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http://dx.doi.org/10.1109/TWC.2010.092810.091092
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covering different aspects, but i found especially inreresting last two.
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* http://community.ubnt.com/t5/airMAX-General-Discussion/NanoBeam-M5-19-why-is-NO-LONGER-gigabit/m-p/743292#M39584
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Some initial units had a Gigabit port, but did not ship with Gigabit POE.
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Gigabit LAN will be a feature for AC products and NBE-M5-400 and not NBE-M5-19 which will have 10/100Mbps ports. According to our research, there's no real need to include Gigabit port on NBE-M5-16/19 cause they're not for backhaul, in most cases will be used as CPE. In the other hand, NBE-M5-400 is being use as high distance CPE, but in most cases for PtP links.
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* http://community.ubnt.com/t5/airOS-Beta/V5-6-Beta-Long-Range-PtP-Help-Message-still-useless/m-p/809104#M17226
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ACK Hardware limits are:
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40MHz - 15.2 miles (24.5 km)
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30MHz - 32.5 miles (52.3km)
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20MHz - 32.5 miles (52.3km)
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10MHz - 65.2 miles (104.9 km)
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8MHz - 65.2 miles (104.9 km)
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5MHz - 130.9 miles (210.7 km)
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h2. AirView test
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References:
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* http://forum.ubnt.com/showthread.php?t=52560
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* ETSI EN 301 893 v1.7.0 (2012-01)
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* http://www.etsi.org/deliver/etsi_en/301800_301899/301893/01.07.00_40/en_301893v010700o.pdf
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** See diagram page 17 of the ETSI PDF
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Lab on table same room compliance mode 5.5
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- one NSM5 AP WDS
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- one LocoM5 STA WDS 1 meter from the NSM5
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- one NBM5 head (without dish) right in between Loco and NS running AirView
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Steps for each graph
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# associate NS and Loco with new frequency and width
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# clear airview
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# launch 300 second iperf client between netbook behind NSM5 to iperf server on locoM5
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# after iperf is done save airview screenshot
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# go back to step 1
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h3. First batch testing narrow channels 5240 with 5200-5300 airview:
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* 3 MHz
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 !5240-3.png!
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* 5 MHz
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 !5240-5.png!
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* 8 MHz
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 !5240-8.png!
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* 10 MHz
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 !5240-10.png!
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* 20 MHz
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 !5240-20.png!
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h3. Second batch testing large channels 5300 with 5200-5400 airview:
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* no emission to verify noise
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 !5300-0b.png!
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* 10 MHz
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 !5300-10b.png!
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* 20 MHz
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 !5300-20b.png!
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* 30 MHz
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 !5300-30b.png!
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* 40 MHz
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 !5300-40b.png!