The current name for what has historically been known as the AES/EBU standard of interfacing digital audio signals between hardware machines. The full name is actually AES3-1992, but generally the last four digits (which signify the year the standard was adopted) are dropped. AES3 specifies a particular type of data structure (also defined in IEC958 Part 4) as well as a specific type of interconnect. The data protocol includes up to two channels of up to 24-bit audio running at sample rates up to 96 kHz. It also spells out the uses of all of the various bits of subcode data and other information that can be transmitted along with the digital audio data. The AES3 hardware interconnect standard calls for 110 ohm balanced lines, usually on XLR connectors.