On Sun, 2008-02-03 at 18:51 +0000, Alice Stamping wrote: > On 1 Feb 2008, at 14:33, Andy Davidson wrote: > > > So how did you solve the duplexity issues of Wireless, and > > what they does to high-demand voip ? > > Andy, most of the wireless providers have bet the farm on being able > to cover their ears and sing, 'la la la, I can't hear you' when > customers ask questions about contention and duplex, especially if the > customer wants to use fairly real-time applications like voice.
its not just wireless providers, most providers in general wont discuss things like contention rates, especially on peering links, but often even internal to their network. With wireless there is more than that, many APs cant handle very large numbers of people associating with them, and while there may be actual bandwidth available that doesnt mean much if you cant associate or constantly get disassociated because the AP just cant handle the load. I think to a point there are some that get into the wisp business without really knowing the number of concurrent associations, whether its half or full duplex, etc. It works in the lab with 1 client, it must work with 1000 :/ It also takes some time, and a bit of money, to add new APs so that the total number of people associating to one AP is reduced. So while it may be fine today, it may not be next month. And if they do manage to expand by placing more APs out there, they still have to place them in the correct spot, if there is a large concentration of people west of the AP and they put more in on the east and north, that wont really help much. So they have to actually do more than just increase density, they have to increase it in the correct spots. And then if its unlicensed wifi, nothing stops neighbors from installing APs that may cause enough noise on the same channel you cant get the signal you want. I do think there is a future for wireless net everywhere, and generally think that the future will be most things are effectively data, and you just get a wireless data adapter. TV, radio, phone, etc. There are already some moves in this direction, just not enough for it to reach critical mass and begin the downfall of the traditional systems. But the cost factor of doing it is enough that in the future I cant see people holding out forever to keep paying the FCC millions per year for their single tv station when someone else can get some spectrum for data and offer many stations. Replace the FCC with whomever happens to be the regulatory authority that licenses spectrum in your area. -- Trixter http://www.0xdecafbad.com Bret McDanel Belfast +44 28 9099 6461 US +1 516 687 5200 http://www.trxtel.com the phone company that pays you! _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-biz mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-biz
