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. Regards, Dan. _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev
