cables occurs in the shielding and grounding of the individual signal and power pairs. IEEE 802.3 and Ethernet V2.0 specify a requirement for signal isolation due to AC-coupling of the AUI connection. The V1.0 standard does not contain this requirement.

The three standards specify different techniques for shielding and grounding.

EEE 802.3

All shields of the individual signal and power pairs are connected to pin 4. The overall AUI cable shield is connected to the AUI connector shell to provide a cable ground. Pin 1 is not used.

Version 2.0

All shields are connected to pin 1 and the AUI connector shell. Pin 4 is not used. Most Ethernet cables are built this way.

Version 1.0

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