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Occasional Contributor II

why is my wifi router speed faster than iap speed?

why are my iap devices only at a fraction of wifi router speed?

 

I have noticed that my wifi router (i.e., modem/router/wifi equipment provided by ISP) offers full speed of the ISP's offered bandwidth plan.  Unfortunately, after optimizing wifi settings, the wifi performance of my iap's (iap205 and iap207 and iap275) do NOT match wifi router speeds...

 

on my iap's wifi bandwidth seems to be cut in half or more.  however, when i connect to router wifi, the speed is at 100% speed offered by isp.

 

I went ahead and purchased the TP-Link Deco M5 to test with ethernet backhaul (setup same way as my iap's).  the Deco M5 matched the speedtest of the router wifi's speedtest.

 

in a nutshell:

wifi router: 215Mbps

deco m5 ap: ~205-210Mbps

iap: 135Mbps

 

is there a solution to this??  I keep reading that wifi is half duplex and that's supposed to explain the ~50% in bandwidth, but that doesn't explain how a prosumer ap like tp-link (deco m5) or a wifi router would be at or near 100% of the isp's bandwidth.

 

NOTE:

  • even without content filters, security options (ids), arp filter enabled, AND standing 10ft from iap to test, the speed at best is 135Mbps
  • wired port to iap is full speed - no bottleneck there
  • Build Time:
    2020-05-01 01:18:58 UTC (build 75343) by p4build
    Version:
    6.5.4.17

 

why are my iap devices only at a fraction of wifi router speed?

Highlighted
Occasional Contributor II

Re: why is my wifi router speed faster than iap speed?

I've noticed that this seems to be a limitation of iap 200 series at least.  does anyone else have this issue?

Highlighted
Aruba

Re: why is my wifi router speed faster than iap speed?

A couple of things would be good to know:

- Band and channel used

- Bandwidth setting (20/40/80)

- Client device capabilities (11n/ac, MIMO)

Are those all the same for the APs you're testing with?

/Onno
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Occasional Contributor II

Re: why is my wifi router speed faster than iap speed?

A couple of things would be good to know:

- Band and channel used --> 5GHz (36) pretty much uncrowded bands in the 5g space since there are not too many devices around right now.

- Bandwidth setting (20/40/80) --> 20, 40, 80... but 80 support is disabled

- Client device capabilities (11n/ac, MIMO) --> connected w/11ac... how do i find out about MIMO on client? regardless they all were tested one after the other...

 

Are those all the same for the APs you're testing with? --> yes

Highlighted
Aruba

Re: why is my wifi router speed faster than iap speed?

VHT40 with 2x2 MIMO gives a peak over-the-air datarate of 400Mbps, and you should expect 250Mbps or so peak TCP throughput with a single client device. 135Mbps is definitely too low. Sure you're not operating with 20MHz channels?

/Onno
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Super Contributor II

Re: why is my wifi router speed faster than iap speed?

Have you tried turning off 20mhz channels? If the AP is using 40mhz channels you should see 36+ with the + meaning its running as 40mhz. 

 

 

Dustin Burns
Senior Mobility and Access Engineer @WEI
ACMX #509 | ACCX #1272 | ACSP | ACDA | ACEP | CCNP | CCDP | CCNA Wireless

If my post address your queries, give kudos and accept as solution!
Highlighted
Occasional Contributor II

Re: why is my wifi router speed faster than iap speed?

i am connecting on 20mhz channels when i get those results... but these are the only channels available to me:

olg-IT-admin_0-1601577549106.png

 

Highlighted
Occasional Contributor II

Re: why is my wifi router speed faster than iap speed?

It doesn't look like the 40mhz channels are available to me... i guess they're restricted?

i'm now looking at this as a guide:

RackMultipart20150601-8281-1uc2bnq-graphic-80211-acChannels-all_inline.png

 

I then enabled 80mhz channel and am using 149:

2020-10-01_11-58-42.png

 

 

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Aruba

Re: why is my wifi router speed faster than iap speed?

Try setting the channel to 36+ (40MHz) or 36E (80MHz).

/Onno
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Super Contributor II

Re: why is my wifi router speed faster than iap speed?

In the valid channels, the channels with the + at the end of them are 40mhz channels, and the ones with E at the end are 80mhz channels. Looks like you do have them. I would also suggest changing wide channel bands to 5ghz only, not All.

 

 

Dustin Burns
Senior Mobility and Access Engineer @WEI
ACMX #509 | ACCX #1272 | ACSP | ACDA | ACEP | CCNP | CCDP | CCNA Wireless

If my post address your queries, give kudos and accept as solution!
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