[Jack-Devel] AVB

Fernando Lopez-Lezcano nando at ccrma.Stanford.EDU
Tue Feb 26 07:27:18 CET 2019


On 2/25/19 9:06 PM, happy musicmaker wrote:
> 
> MOTU once told me that their http://motu.com/products/avb/avb-switch AVB 
> switch should work with Linux.

??
Their switch is just an ethernet switch that is AVB aware. It will work 
with anything. For example, a Linux computer can connect to the Motu's 
interfaces web server. It is ethernet.

> Anyone had experience if all 32 channels @ 48KHz works with JACK and ALSA ?

Have you been following the thread?

While you can send standard ethernet traffic through their switch, AVB 
is something else. If you want to output or input AVB streams directly 
from Linux you will need to do a lot of work (and please share it if you 
do!). The openavnu repository would be a start but I don't know of 
anyone that has a full stack working.

I managed (a long time ago) to get Linux to see a Motu interface and 
sync with its clock but that was it, never got to streaming.

> I have some i210 cards and three 8 channel ADAT preamps  so would be 
> eager to know before spending the $.
> Still looking for an audio interface on Linux to support 24 to 32 
> channels @ 48Khz.

Is that input or output or both? Please read the thread in detail.

I have been using Motu AVB interfaces through USB2 and with up to 64 
channels of I/O total (the computer connects through USB2 to the 
interface, and if you need more I/O than what the directly attached Motu 
interface can do you need to use more than one and bridge them with 
AVB). 24 channels is relatively easy, more I/O channels requires having 
the right sound interface _and_ the right firmware (an older version 
than what ships today). I have used the 16A, 24Ai, 24Ao and others of 
the same generation. You also need a properly tuned system, of course.

-- Fernando


> On Mon, Feb 25, 2019 at 7:15 AM Chris Caudle <chris at chriscaudle.org 
> <mailto:chris at chriscaudle.org>> wrote:
> 
>     On Sun, February 24, 2019 4:54 pm, Fernando Lopez-Lezcano wrote:
>      >>> Even then I found problems with the latest firmware version, input
>      >>> channels would shift in blocks of 8 every few seconds (ie: input
>      >>> coming in through channel 1 would suddenly appear in 9, and so
>     on and
>      >>> so forth). Again, downgrading a bit gets rid of that problem.
> 
>      > I imagine that would not happen if you were to use their proprietary
>      > driver instead of the class compliant driver.
> 
>     Wouldn't Apple equipment be using a class compliant driver?  Given how
>     much of their business was traditionally to Apple users that seems very
>     strange that they would have firmware that breaks class compliant use if
>     it also broke usage on Mac OS and iOS. I guess Mac users only get the
>     lower channel count firmware?  But that is the same firmware you say
>     shifts the channels around, correct?
> 
>     -- 
>     Chris Caudle
> 
> 
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