A PC/switch/router path expected to support higher Ethernet rates.
Check the exact device
Menu names and behavior can vary by US hardware revision and firmware. This guide was researched from official material, not tested on a physical router.
Applies to: A PC/switch/router path expected to support higher Ethernet rates.
Checked: 2026-11-01 · Risk: low · Status: source-grounded editorial draft; not hands-on tested.
Before you begin
Record which exact interface negotiated 100 Mbps. A local NIC result is not automatically the speed of every link in the house.
Procedure
- Check the PC link rate and the adjacent switch/router port capability.
- Use a known-good suitable cable and a different supported port, one substitution at a time.
- Prefer the vendor-supported auto-negotiation setting rather than arbitrary forced duplex combinations.
- Where safe, bypass the intermediate switch for a comparison test.
- Repeat the same transfer test; inspect the whole path if the local link is normal but throughput stays low.
Verify the result
The intended link negotiates correctly and the same test improves. A higher link rate alone is not a guarantee of ISP speed.
Undo or recover
Restore cable/port assignments and the previous supported NIC configuration if needed.
Stop and escalate
Damaged connectors, repeatedly dropping links or an unsupported switch/adapter require hardware diagnosis; no router factory reset is indicated by this test alone.
The steps above combine paraphrased official instructions with an original safety and test workflow. They are not a verbatim manual, a guaranteed fix, or evidence of a common hardware defect.
Official sources
- TP-Link unmanaged-switch link-rate troubleshooting —
tp-switch-speed; access: full_text.
Try the right tool
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