The original MIDI 1.0 Specification called for using a 5-Pin DIN cable to connect MIDI compatible devices, but today there are many different "transports" capable of carrying MIDI data, and the specification for 5-Pin DIN has been updated.
Some of the transport specifications for MIDI were developed in conjunction with other organizations (typically those who control the specification for that particular transport). Below are descriptions of all MMA-approved alternate transport specifications and where to get the document.
[Information about USB-MIDI and RTP-MIDI is temporarily unavailable... please stay tuned.]