While I’m waiting for Assaf to create the next-gen soup, here is the partial list of abbreviations and their meaning I have to learn. In some cases, it takes me 20+ years in time…

• AUI : Attachment Unit Interface, originally connected to a MAU
• MAU : Medium Attachment Unit, like a 10Base-2 transceiver.
• XAUI : A 10G AUI, the X is the Roman numeral for 10; Data path is 4×3.125Gbps Lanes
• XLAUI : A 40G AUI, XL being the Roman numeral for 40; Data path is 4×10.3.125Gbps Lanes
• CAUI: A 100G AUI, C (you guessed it) being the Roman numeral for 100; Data path is 10×10.3125Gbps Lanes
• MII : Medium Independent Interface, 4bit wide data path.
• RMII : Reduced MII, the MII but with less signals!
• SMII : Serial MII, the data path is reduced to one bit.
• GMII : Gigabit MII, 8bit wide data path.
• RGMII : Reduced Gigabit MII.
• SGMII :  Serial Gigabit MII.
• XGMII : 10G MII (this time the G made it in).
• XGXS : XGMII eXtender Sublayer.
• XLGMII : 40G MII.
• CGMII : 100G MII.
• MAC : Media Access Controller.
• PLS : Physical Layer Signaling; for 10Mbps only, implemented the Manchester encoding.
• RS : Reconciliation Sublayer.
• PCS : Physical Coding Sublayer; e.g. 8B/10B.
• MLD : Multi Lane Distribution
• PMA :  Physical Medium Attachment.
• PMD : Physical Medium Dependant.
• IPG : Inter Packet Gap; Code words sent between valid Ethernet Frames.

See also the Broadcom glossary of terms.