1Gig household, computer isn't receiving 1Gig speed.
1Gig household, computer isn't receiving 1Gig speed.
Check your switch's performance using a speed testing tool to confirm it handles 1000Mbps.
Link the external cable straight to your computer and observe the results.
Length isn't the problem; Cat6 supports Gigabit over 100 meters. It's likely the connection was not made properly, got damaged, or connected to a 10/100 port instead. Test by connecting your switch—known to work well—at the cable’s end and checking if your PC receives a Gigabit signal.
I finished my testing and picked up a laptop. It confirmed it supports 1Gig speed. There was a single cable from the router to the backroom, connected via an ethernet link, then the rest went into my room behind the house. After disconnecting the coupler and connecting the router end to the plug in my laptop, I got 500Mbps—great! When I reconnected everything and went upstairs, it dropped to 100Mbps (not ideal). I suspect the issue is with the coupler. If you’re okay with a quick fix, you could cut the RJ45 ends on the cables plugged into the couplers and splice them together for a longer run.
Make sure it supports gigabit speeds. Have you replaced the coupler with a switch?
I've returned to the setup. Green lights mean 1000Mbps, and now my switch replaces the coupler, showing green signals. This suggests it's delivering 1000Mbps. Ports 1 and 4 are connected and both show green, indicating the switch is operating at 1000Mbps. However, when I run a speed test from my computer, it shows 100 Mbps, and even my network card reports 100. It seems the couplers might be affecting performance. I've checked the router settings page for connected devices, which confirms my PC is seeing 1000MBps. But my MOBO LAN device displays differently.
In summary, I believe the issue lies with the couplers—they seem low-quality and look like the cheap options sold online. The best solution would be to rerun the 45-meter cable from my bedroom to the living room indoors, avoiding outdoor work. I’ll need to convince my parents to let me do that so I can keep trying to fix it. Thanks to @Needfuldoer and @OhioYJ for your support!