Friends Kingdom: Re: [iPad] Browser for iPads

Agreed. I now recall you getting only 600kbit, so RB's post made it click

From: "Pete petefromflorida@gmail.com [iPad]" <iPad@yahoogroups.com>
To: "iPad@yahoogroups.com" <iPad@yahoogroups.com>
Sent: Wednesday, 5 November 2014 1:41 PM
Subject: Re: [iPad] Browser for iPads

I'm just happy that someone in this group could explain it. Thanks.
Pete

On Nov 4, 2014, at 7:28 PM, "Rampant Badger badger@rampantbadger.com [iPad]" <iPad@yahoogroups.com> wrote:

Well,each of you were correct based on the observable data available to you, that is, in Pete's case, the limiting factor throughout all of his tests was his Internet connection. At 600Kbps, it was always below the minimum speed to which the WiFi device (Access Point, hereinafter "AP") would scale the AP to device bandwidth. Therefore, and for the sake of argument, assuming an 802.11g connection (maximum AP to device of 54Mbps) it matters little whether he was standing next to the AP (54Mbps) when running a speed test, or out in the farthest reaches of his property (1Mbps), his speedtest results would always approximate his 600Kbps Internet connection (600K < 1M < 54Mbps). So his statements that he never saw a speed test result decrease based on distance would be true.

Your Internet connection is faster, so you would see the effects of DRS. Standing next to your AP, you would expect a speed test result of approximately 14Mbps (rate is limited by your ISP, 14Mbps < 54Mbps), however, as you move farther away from your router, then the DRS functionality will kick in, and the AP will start to rate limit (scale back) transmissions to your device (to try to minimize lost packets having to be resent). So as that rate falls below your available bandwidth from your ISP, you would start to see decreasing speed test results, and at this point the limiting factor is the AP via DRS.

I hope that makes sense, it is easier to explain on a whiteboard than in an email.

And since permission was previously granted, here is a screenshot. I am currently sitting on a couch which is about 6 feet closer to my AP than when I was at my desk the other day when I reported a speed of 145Mbps or so. At this point, my speed has jumped to the normal 802.11n max of 300Mbps.

And for those who thought the above information about DRS was in any way interesting or confusing, look up the meaning of the MCS [1] Index value as reported, i..e. DRS on steroids.

Best of luck,

RB

[1] Modulation and Coding Scheme

On Tue, Nov 4, 2014 at 5:07 PM, Tony tdale@xtra.co.nz [iPad] <iPad@yahoogroups.com> wrote:

Hi RB, thanks for chiming in.

My point is that speed decreases as you move away from the wifi router. Petes point is that it doesn't.

My real world case is as follows. My ADSL2+ connects to my modem at 14mbit. My rMBP where I am on now has a speediest of 12mbit.
I can download at 12 mbit file transfer speed if the file I am downloading supports that throughput. If I miss F1 or MotoGP I download them at this speed, circa 1.2 megabytes per second.

Now, if I move to the other end of my property, my speedtest is 3 mbit. So I cannot download faster than 3 mbit, my connect rate and thus my speed, or wifi transfer rate has dropped significantly. Pete is of the view that I should be able to download at the same rate as if I was closer, as while the signal is lower, the speed is the same. But it isn't. Distance and interference has decreased my connect rate on wifi, so my file transfer rate is lower, even though the radio wave speed is unchanged.

Maybe our discussion is about radio wave speed for Pete and wifi speed, or internet speed for me? Connect rate to be more precise. Although the internet is 100% irrelevant, as its unchanged at the source which is the wifi modem.

From: "Rampant Badger badger@rampantbadger.com [iPad]" <iPad@yahoogroups.com>
To: "iPad@yahoogroups.com" <iPad@yahoogroups.com>
Sent: Wednesday, 5 November 2014 6:35 AM
Subject: Re: [iPad] Browser for iPads

On Tue, Nov 4, 2014 at 12:14 PM, Pete petefromflorida@gmail.com [iPad] <iPad@yahoogroups.com> wrote:

Thanks! Very informative. My average connection speed from my ISP is about 600 Kbps. Would this explain why I have no loss of speed as I get further away from my router. Notice my ISP speed is already slower than the throttling provided by dynamic rate scaling.

If you are running speed tests against the Internet, then yes, absolutely, since most WiFi devices will scale down from their rated max to (usually a minimum of) 1Mbps. Since that is faster than your Internet connection you would likely see no decrease in bandwidth as reported from speedtest.net and the like.

RB

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