Networking guide
2.5Gb Ethernet Over Cat5e? My In-Wall Cable Test
Before replacing the Ethernet cable inside my walls, I tested it with a faster local network. The short Cat5e route exceeded my expectations, but getting the setup connected came first.
The main takeaway
Test the wiring you already have before paying to replace it. My short route performed surprisingly well, but that result isn't a certification of every Cat5e installation.
Best for
Homeowners investigating wired connections, local transfers and a stronger backbone.
Before you start
This adapts my original video and test. Check current specifications, firmware support and prices before buying older equipment.
Original video
2024-08-31
Focus
2.5Gb Ethernet over Cat5e
Article type
Practical guide
What helps
- Existing cable tested before replacement
- Local baseline established first
- Shows the troubleshooting as well as the result
What to know
- One short run isn't a universal speed guarantee
- Terminations and endpoint hardware matter
- Internet tests alone won't test a fast local link
The question behind my cable test
I was planning a 2.5Gb home-network upgrade and wanted to know whether the older cabling in the walls would become a limitation. Instead of replacing it first, I assembled a faster local test setup. The August 2024 video compares a working baseline with a path through the in-wall cable. The tested run was estimated at roughly 30 feet, which is an important limit on how broadly to apply the result.
Build a working baseline before testing the wall
My local setup used a capable NAS, computer and networking hardware. Establishing a baseline helped separate the cable question from a device or configuration problem. A remote internet speed test would be the wrong tool for a link that could be much faster than the internet plan. The destination, network adapters and switch ports all have to support the performance you're trying to measure.
The connection problem was part of the experiment
When I moved the equipment, the computer initially wasn't getting the expected connection. I rechecked the router and switch connections and changed a cable arrangement before the setup worked. The video doesn't conclusively diagnose every cause of that interruption, so I wouldn't label it a cable failure. Before buying new in-wall cabling, verify the topology, address assignment and individual patch leads.
The result that surprised me
The local test through the short in-wall route reached roughly the 9Gbps range, far beyond the 2Gbps or so I had guessed I might see. That was the exciting part of the video. It doesn't mean all Cat5e cabling is rated for that result at every distance, nor that another home's terminations and interference conditions match mine. Treat this as a measured example, not a new standard for cable performance.
What I'd do before rewiring a house
Identify the cable and ports, inspect the terminations, test the existing link and measure the workload you actually care about. If it already delivers your target speed reliably, replacing it may solve nothing. If it doesn't, isolate the endpoint, port, patch lead and permanent run before deciding what to change. My next step was a larger network project, covered separately in the Wi-Fi 7 and 10Gb upgrade article.
Technical references
More networking guides and reviews
Ethernet Over Coax: My MoCA Setup and Speed TestWi-Fi 7 Speed Test: What Changed on My Home NetworkMy Wi-Fi 7 and 10Gb Ethernet Home Network UpgradeI Finally Understand My Home NetworkCommon questions
Did Steve's Cat5e test reach more than 2.5Gbps?
Yes. The short local test route reached roughly 9Gbps in the demonstration.
Does that guarantee 10Gb over every Cat5e run?
No. It was one short installation, not a certification or a guarantee at other lengths.
Watch the full walkthrough