The transceiver cable( AUI) dates back to the early years of Ethernet and at that time had connected the station interface to the transceiver, the Medium Attachment Unit( MAU).
The transceiver cable was limited in length to a maximum of 50 m and was equipped with a 15- pin data plug/ socket. The AUI cable consisted of four, optionally five, individually shielded, symmetrically twisted pairs of wires. In addition, the common shielding ensured protection against radiated interference from outside and radiated interference from inside. Cable impedance was 78 ohms. Since transceivers have been on the network card or motherboard for years, the transceiver cable is a thing of the past.