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Fast upload but abysmal download

aeridith
New Contributor

Hi there,

Getting extremely good speeds uploading (1200Mbps) via speedflex but bad speeds when uploading(350Mbps). Any idea what the culprit could be?

Source device: iPhone 13 802.11ax WIFI-6

Destination: Ruckus 750 with 802.3at 

Cheers,

Aeridith

 

10 REPLIES 10

aeridith
New Contributor

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Squozen
Contributor

I have similar results on an iPhone 12 with an R650.

DarrelRhodes
Valued Contributor

Hi Aeridith,

I don't believe SpeedFlex is giving you accurate data, as the iPhone 13 doesn't have the hardware capability to push 1.2Gbps via Wi-Fi.

I have an iPhone 13 Pro Max and on my 900Mbps FTTP circuit, with 80MHz channels on a Ruckus R750 with a 2.5Gbps Ethernet connection, the max throughput I've seen (using Ookla Speedtest.net) is 616Mbps.

The MCS11 rate for a 2-stream 802.11ax device (such as the iPhone) @80Mhz channel width, with short guard-interval is 1,201Mbps.  This would usually result in a TCP throughput of 40-60% - at most, approx 720Mbps.

I would recommend using an internet-based speed-test or local iPerf server to determine true TCP throughput. As detailed here: https://support.ruckuswireless.com/articles/000003772

I hope that helps,
Darrel.

I've seen 846Mbps from my iPhone 12 on Speedtest. The internet is very good here though.