[sdiy] ADDA & MIDI over Ethernet/Firewire?

[ASSI]

On Tuesday 10 June 2003 23:22, Neil Johnson wrote:
> > I just find that MIDI over Ethernet is set to become an IEEE
> > standard.
>
> Oh great, YAS syndrome strikes again (Yet Another Standard).

I agree, I was a bit disgusted as well. On the other hand, there are 
Linux drivers and I don't use the computer for anything but bank 
backups and OS updates - that should work and if it gets widespread 
enough to be able to control a MIDI router from Ethernet, this would 
suffice for me.

> As John says, it'll be interesting to see how they graft the desired
> QOS on top of TCP/IP.

IMHO this would only work (with some limited success) if all ports on 
the network were throttled for "normal" traffic. But I really would not 
trust this "solution" enough to not dedicate the wire anyway.

If you've followed the earlier discussion I already have come to the 
conclusion that I'd just use the physical interface to FastEthernet 
anyway and put a dedicated protocol on top of that that can deal 
properly with the realtime nature of the data.

I'm still somewhat undecided on wether it's necessary to integrate 
Error Correction - the allowable BER from the spec is a bit on the high 
side for audio, however I'd expect the typical network to exhibit much 
lower rates. I've checked the error counters of the GbE->FE switches 
back at the university regularly and I haven't had a single instance of 
packet errors that didn't originate in a physical fault of either 
interface or cabling. This was pretty amazing, given that the diameter 
of the network was almost the allowable maximum and a tram line just a 
few meters outside produced heavy EMI (the CRT all had to be replaced 
with LCD eventually). So error detection and location of the faulty 
segment might be all that is necessary.

Oh, BTW - anyone knows where to get Crystal (now Cirrus) AD/DA (I know 
the Cirrus distributors for Germany, but typically they don't really 
talk to you until you show a prospective volume of a few thousand units 
per year...).



Achim.
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