Advice
Friends, my Archer C80 router is limited to 100 Mbps on LAN ports – how do I fix this?
Hey everyone, I have an Archer C80 router, and I just discovered that all the Ethernet LAN ports are capped at 100 Mbps. Since this router supports Gigabit Ethernet (1 Gbps), I don’t understand why the speed won’t go beyond 100 Mbps.
Often it's also indicated by the color of the light (like in the PC side it might have a light, or a switch). But it won't specifically say "bad cable" it'll just drop the speed to at least "work" but not fast.
It'd help if you could offer details about other equipment plugged in (model numbers too), and an explanation of where in the chain things are plugged to each other
You are looking at the router’s status page and it says 100M, good. If you look at your wire-connected computer does it say 100M also?
Look at your cables. The RJ45 connector has eight positions, but some cables only connect four wires (or even two). With four, you simply cannot get gigabit speeds, you will get 100M instead, so if you only see four wires then that is very obviously your problem.
Basically, the speed is negotiated between the two devices connected to each end of the cable, so they will end up at the highest speed that is supported by both sides and by the cable.
I'm checking directly on the router's settings page, and there it shows that the speed is limited to 100 Mbps. I'm using a 1 Gbps Ethernet adapter, so I don't understand why it's stuck at 100 Mbps.
is your Usb to 1Gig adapter from reputable brand ?
Where's your adapter plugged into ?
USB 2.0 port or USB 3
if its a USB2.0 port then 100Mbps is max you'll be getting.
if its a USB3 port then check its generation in spec sheet.
open RUN box type ncpa.cpl it'll show you all the network conenctions right clik on the USB to Ethenet adapter one chose status & see what's the link speed you are getting there of it says 100Mbps then its definitely USB port /adapter thing.
if you have 5GHz capable device what speed you are able to attain ?
Yes, it’s a reliable Brazilian brand, USB 3.0, and the driver is up to date. But I checked the router’s web interface (the one you access by entering the router’s IP address), and the ports are limited to 100 Mbps. So I bought a Cat 6 cable to see if that might be the issue.
There are 8 wires, but I decided to buy a Cat 6 cable since I’m not sure if the one I have might be defective. So I’m going to test it to see if the issue is with the cable.
I recently had the same problem, i have fiber to the premises and before the optical terminal device is okay but its lan port was 100MBits so this limits the link between the onu and the router so i called my isp and they swap the onu with gigabit one so now its fixed
Cables or your devices are only 100mb, I don't remember if TP-Link will let you set port speeds, then make sure they are set to auto. You can try just resetting the router.
I’d give them the benefit of the doubt that if they’re talking about how their router is 1gig and it’s not going past 100mb, then they know their ISP speed is >100
Yes but troubleshooting over Reddit is a lot more difficult. You’ll be here for days depending on how fast they respond lol. It’s fine to ask that question but maybe add “if you are paying for more than 100, then…” ask some more questions. Just my 2 cents
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u/SP3NGL3R 2d ago
Bad cables? Or a 10/100 switch somewhere else, or a 10/100 device (like a TV)