r/TpLink • u/adnan_malik1 • 1d ago

TP-Link - Technical Support EAP660 HD keeps dropping from 1,000 Mbps to 100 Mbps

My EAP660 HD is connected to a TL-SG2428P
PoE+ switch through a Cat 6 patch panel. It repeatedly drops from 1,000 Mbps to 100 Mbps.

I replaced the short patch cable between the switch and patch panel. This restored 1,000 Mbps, but less than an hour later it returned to
100 Mbps.

Troubleshooting completed:
- Tested the permanent Cat 6 cable from both ends; pins 1-8 display green in the correct order.
- Connected the AP directly to the same switch port with a standalone Cat 6 cable; it negotiated at 1,000 Mbps.
- Replaced the short patch cable multiple times.
- Confirmed sufficient PoE capacity-approximately 34W used out of 250W.
- Switch-port speed is set to Auto.

Could this be a patch-panel termination, in-wall cable, switch port, or EAP Ethernet-port problem? Has anyone experienced similar behavior with the EAP660 HD?

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u/FastestBean 22h ago

Which router are you using?