2.4 Internal and External MAUs

Notice that in the figure above there are dashed lines indicating the two kinds of configurations shown - one with an external MAU and one with an internal MAU. With an external configuration a DTE or repeater port is equipped with a 15-pin AUI connector. The AUI cable and MAU are both located outside the device. This is how a computer or repeater looks when connected to an Ethernet segment using an external transceiver cable and external transceiver.

However, it's also possible for the MAU and AUI to be integrated as part of the electronics inside the DTE or repeater port. In this case, the only exposed device on the device is the MDI that connects directly to the network media. This is the type of connection found on a thin coax or twisted-pair Ethernet interface used in a DTE, for example.

Quick Reference Guide to 10-Mbps Media System - 04 SEP 95

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