Why has my Gigabit link dropped to 100Mbps?
Start by swapping in a known-good lead and checking both Ethernet ports.
Gigabit Ethernet uses all four pairs, so damage or a bad contact affecting one pair can leave some equipment falling back to 100Mbps.
A simple visual check is not enough to rule that out.
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1m Black Cat6 U/UTP Copper Patch Lead
SKU: DLX-Z-PC-C6CU-1.0BK
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0.12m Black Cat6 U/UTP Copper Patch Lead
SKU: DLX-Z-PC-C6CU-0.12BK
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0.12m Blue Cat6 U/UTP Copper Patch Lead
SKU: DLX-Z-PC-C6CU-0.12BL
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0.12m Green Cat6 U/UTP Copper Patch Lead
SKU: DLX-Z-PC-C6CU-0.12GN
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0.12m Grey Cat6 U/UTP Copper Patch Lead
SKU: DLX-Z-PC-C6CU-0.12GY
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0.12m Orange Cat6 U/UTP Copper Patch Lead
SKU: DLX-Z-PC-C6CU-0.12OR
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0.12m Pink Cat6 U/UTP Copper Patch Lead
SKU: DLX-Z-PC-C6CU-0.12PK
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