![Ethernet testing standards](https://kumkoniak.com/58.jpg)
- Class F: link/channel up to 600 MHz using Category 7 cable/connectors.
- Class E A: link/channel up to 500 MHz using Category 6 A cable/connectors (Amendment 1 and 2 to ISO/IEC 11801, 2nd Ed.).
- Class E: link/channel up to 250 MHz using Category 6 cable/connectors.
- Class D: link/channel up to 100 MHz using Category 5e cable/connectors.
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Class C: link/channel up to 16 MHz using Category 3 cable/connectors.Class B: link/channel up to 1 MHz using Category 2 cable/connectors.Class A: link/channel up to 100 kHz using Category 1 cable/connectors.The standard defines several link/channel classes and cabling categories of twisted-pair copper interconnects, which differ in the maximum frequency for which a certain channel performance is required: JSTOR ( January 2019) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.
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