MIDI timepiece protocol specification

[teroyk]

I noticed from Emagic, Opcode and Motu serialport midi-interface manuals tell that they all are at least MIDI timepiece protocol (MTP) compatible.
Does somebody have detailed specification about that protocol?

All information is welcome, but I am specially detection information, how to tell interface to switch connection speed between 1 Mhz and 4 Mhz and
how to detect how many ports are available?
Only information that I know so far is:
- send all ports command is:"F5 00"
- send port xx: "F5 xx", where xx <> 00

[teroyk]

And F5 F5 sends F5 to last selected port.
Has anybody more information?