1 Nov
2009
1 Nov
'09
2:11 p.m.
On November 1, 2009 12:55:44 pm you wrote:
On Sun, 2009-11-01 at 12:56 -0400, Raymond Martin
wrote:
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
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.