linuxaudio.org

On November 1, 2009 12:55:44 pm you wrote:

quoted text
> On Sun, 2009-11-01 at 12:56 -0400, Raymond Martin wrote:

> > 15 meters is a recommendation based on typical cables used in a simple

> > system. Data corruption ensues somewhere after 15m, depending on cable

> > quality, EMI, and so forth. I would imagine a CAT5 as having better

> > shielding and IIRC runs for that are advised to somewhere up to 50m.

> > Different frequency ranges though, so signal loss/degradation per meter

> > may vary.

>

> My recollection is that when MIDI was originally standardised, they

> needed to specify a maximum length, and that 15M was chosen somewhat

> arbitrarily (No tests were done, no eye patterns examined).

>

> Now midi is actually at heart a 5mA current loop interface running at a

> fairly low baud rate (31.25 Kbaud IIRC), so should be good for far more

> then 15m without any problem, however nobody really knows and it will

> depend a bit on the environment and the receiver.

>

> Interference is unlikely to be an issue assuming good quality twisted

> pair cable (Cat 5 counts), but bulk capacitance just might ultimately

> limit the length.

> 

Check MIDI manufacturers association pages, specifically:

http://www.midi.org/aboutmidi/tut_midicables.php
At the bottom it talks abut MIDI over Ethernet, with links.
Cheers,
Raymond

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