What are the bottlenecks of my current setup.

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ngaihou

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May 27, 2014
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Dear Networking Professionals,

My internet speed has been upgraded to 500mpbs, however I realized that my current hardware may not support the speeds provided after troubleshooting my current setup.

I would like to have maximum WiFi speeds if possible.
Below is a brief sketch of my setup.

ISP--500mbps--BTU---TP-Link AC 1750--- Devices
--Cat5e--> TP-Link AC 750 -- Devices

I am using the AC 750 as a wireless access point, both AC 1750 and AC 750 are connected via the Gigabit ethernet.
I ran speedtests while connecting my device with a Cat 5e cable to the AC 1750 Gigabit port and I was able to obtain the 500 mbps.

Here are the problems I encountered:-

1. While connected to the AC 1750, I am only able to achieve a max speed of 100mbps whilst connected to the 5gHz wifi, needless to say, the 2.4 gHz connection gives me a maximum of 50 mbps. Is there an issue with my router?

2. After running speed tests on the AC 1750 5 gHz connection, the connection will drop. Is this a common issue?

3. When connected to the 5gHz band of the AC 750, I am only able to obtain a max of 50 mbps. I switched to a wired connection to the gigabit port and still my max speed was only 80 mbps. So I swapped out the Ethernet cable connected directly to the AC 1750 and viola, I got 500 mbps.
My suspicion is connecting the internet enabled ethernet cable to Port 1 of my AC 750 somehow limits the speeds provided.

I would appreciate any form of advice provided.
 
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anotherdrew

anotherdrew

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Dec 27, 2017
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Only getting 80 Mbps using an Ethernet connection through the AC 750 (Archer C2?) is surprising. It could be a bad cable (750 to computer), something wrong with the router, or something with the configuration. I assume you have turned off DHCP on the 750. One thing to try is different ports ... I assume you are using LAN1 and LAN2 ... what happens if you change that to LAN3 and LAN4? What happens if you turn wireless off?

As far as WiFi ... I'm still a bit surprised your not getting faster speeds (not shocked). Remember that WiFi is 2 way, so it could also be a limitation in your WiFi adapter (laptop? phone?). Since I assume your test were done within line of sight of your routers and less than 10 feet away, my concern would be interference. Everything has WiFi built in now and we are filling the air with garbage (and lets not forget cordless phones, microwaves, etc). There are free WiFi analyzer apps that you get on your phone to view the strength of your signal and other others around you. You may find the WiFi channels your equipment is using is shared by other devices.

In conclusion ... I think your equipment should be capable of giving you faster connections than you are getting and I would investigate further as to why you are not getting more.
 
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ngaihou

Honorable
May 27, 2014
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I used the same cable to test the Ethernet on AC 1750 and AC 750.
As for the cable connecting the AC 1750 to AC 750, it gave me the expected speeds.
Yes, I have turned off DHCP on the AC 750 to use it as a wireless access point.
I shall try different ports, but I do not see why only specific ports have higher speeds than the others.

I was running the tests on an iPhone 6 and a Lenovo laptop which both produced 100-200 Mbps speeds right next to the AC 1750 router on the 5 gHz band.
Like I mentioned, the router will hang every other test and leaves the speedtest incomplete.
I tried running speedtest on 2.4 gHz right next to the router but the speeds are dismal.

Is there a setting for TP-Link routers that limits the speed?
 
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anotherdrew

anotherdrew

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Dec 27, 2017
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Pins get bent or broken, solder joints fail, etc. Sometimes you have a bad port. It's an easy check and costs nothing.



My understanding is the iPhone 6 generally does not get over 200 Mbps no matter what. I don't own one, so I don't have personal experience with this. You might want to check specs on your laptop.



Often incomplete speedtests are a sign of lost packets. This could be an issue with your network or you ISP. It could also be the result of WiFi interference. Have you ever done ping testing?



TP-Link routers have some rudimentary functions that attempt to prioritize some traffic over others. Look for WMM (Wireless MultiMedia) and bandwidth allocation.

 
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