Hacksawbob Posted February 26, 2009 Posted February 26, 2009 we use apple extremes we needed 2 for a suite of 20 q1's once there up and running no issues.
MarkPower Posted February 26, 2009 Posted February 26, 2009 Just thought I would add a really interesting section from one of the technical data sheets that Ruckus have to eliminate the worry of dense environments etc. Takes a little reading but sums it up really well. In the adaptive model, co-channel interference is limited because by design adjacent cells are nearly always on different channels. When fewer channels are available, access points on the same channel must be spaced closer, and co-channel interference becomes significant. While directional antennas and other techniques can be used to minimize the effect, co-channel interference limits transmission capacity and quality in many of today’s Wi-Fi networks. The mechanism whereby transmissions are inhibited in Wi-Fi is called carrier sense multiple access with collision avoidance for the media access control layer (CSMA/CA MAC). When a client or access point is about to transmit, it first checks the medium to see if any other transmissions are on the air. Even when such transmissions are detected from a distant cell on the same RF channel, if they can be successfully decoded they will inhibit the pending transmission. Similarly, if a device begins to transmit and senses another simultaneous frame on the air, it will cease transmission and enter a backoff mode. The effect is that transmissions in nearby cells on the same RF channel can prevent local devices from transmitting, even when the intended recipient of the transmission might not be in an area of interference. Purveyors of single-channel architectures often claim that their WLANs eliminate co-channel interference, an extraordinary contention given that adjacent access points and clients are by definition on the same channel. One would expect that co-channel interference would be much more significant in the single-channel than the adaptive model. The fact is that single-channel WLANs are indeed affected by co-channel interference in the same manner as the adaptive WLANs, but to a much more significant degree. Co-channel interference becomes one of the most significant challenges to performance in the single-channel architecture. when a particular access point or client transmits, all others within its interference zone are inhibited as they sense the transmission, or forced to retransmit as the co-channel interference prevents them decoding the desired signal. Essentially single cell vendors often talk about the controller arbitrating the bandwidth so there is no co-channle interference…essentially sharing the bandwidth of many APs with the performance of a single 20mhz channel which limits performance given the UK schools are often multi floors and as many as 6-9 APs can see each other, that lends to a very expensive cost per mb as they all wait for a share of the single channel What adaptive cell coupled with adaptive RF techniques such as beamforming and interference mitigation cater for total RF management, taking high density deployments that step further, so that instead of everyone being able to turn on their laptops in one classroom (aka single cell) we enable the whole school to turn on their laptops without having to share bandwidth amongst radios on the same channel.
adurrant Posted March 5, 2009 Posted March 5, 2009 If you are worried about coverage and excellent logon speeds with wifi, you need to get Ruckus! Its amazing and knocks socks of HP, DLINK and even Cisco! Its great value! We have it here! 1
freelancer Posted March 5, 2009 Posted March 5, 2009 Hi i recently fitted a wifi solution for 2 large 5 star hotel. 13 APs in total (per hotel) so 26 all together i used netgear prosafe WG102s as they were cheap, gave very good range and also use PoE (i needed this because of where we were installing the aps!) ALL APs had the same ssid, overlapping APs were on different channels, all had the same security. This gave a roaming effect, you can walk the entire distance of the hotel now without noticing you are connecting to different APs. Also the netgear has autocell which detects other aps and makes sure the channels do not interfere with one another, it will auto switch if they do we fitted them around 6 months ago using our own freeBSD based captive portal software (this is the payment and voucher system), feedback from the hotels has been 100%, they have had conferences with over 70 people connecting at any one time and have reported no problems or slow down. i have to admit when i fitted them i didnt think they would be man enough for anythign like that but are far exceeding any expectations i had..! hope this helps
MicrodigitUK Posted March 5, 2009 Posted March 5, 2009 Another poster today says he wants rid of his netgear because it won't handle 30 laptops regards Simon Well I have classes of 32 laptops running fine from 2 Aruba 65 access points (running off the Aruba 800 controller) and they are the equivalent to the NETGEAR WFS709TP and 2 duel band APs, it works like a dream! I also have a 6th form study centre with 50 laptops running from 3 Aruba 65s The only downfall that I can see with the Netgear system compared to the Aruba is that there is a limit to the number of access points because the Netgear system is only based around the older Aruba 800 controller technology which does have its limitations to the number of APS even when you reach the maximum number of controllers and does not and will not support 802.11n access points. Because I have got the Aruba version, I’m ok because I just put in a Aruba 3000 series controller and I am testing a signal 802.11n access points on a new set of 30 laptops and it looks to be working fine. If you have a small site the Netgear system should work fine when correctly setup, but for larger sits it’s not up for the job. This is why i went down the Aruba route. I just wish the two (so closely) related systems would work together then I could go for the cheaper Netgear Access points.
adurrant Posted March 30, 2010 Posted March 30, 2010 I know you dont want it managed! But you are putting money down the loo if you need 3 aps for 30 laptops! One word for you RUCKUS! One AP will handle 60 laptops! You only need one AP in about every other room!! Bloomin great stuff! School coverage for about £12,000 You can see mine in action! Adam 1
CHR1S Posted March 30, 2010 Author Posted March 30, 2010 Erm, thanks? You do realise this thread is over a year old right? lol I know you dont want it managed! But you are putting money down the loo if you need 3 aps for 30 laptops! One word for you RUCKUS! One AP will handle 60 laptops! You only need one AP in about every other room!! Bloomin great stuff! School coverage for about £12,000 You can see mine in action! Adam
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