ACE through a Switch

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  • 2013/03/02 at 11:59 pm #33284
    Profile photo of pealsoundpealsound
    Participant

    Hi Jeff

    What sort of audio activity was going on while you recorded these peaks?

    Busy with audio or silent?

    Cheers
    Jerry

    IDR48 – T112 – Dante card

    2013/03/03 at 1:35 am #33287
    Profile photo of jeffs7jeffs7
    Participant

    Silent. That was an iDR-32 ACE port connected directly to a SuperMicro server with Intel gigabit Ethernet ports. This was based on a 1 minute capture.

    ~Jeff

    2013/03/04 at 9:44 am #33312
    Profile photo of ahjeffahjeff
    Moderator

    Hi Jeff

    The ACE link never exceeds 100 megabits/second. It uses a 100 megabit physical layer interface, so this would be impossible.

    The traffic graph you posted looks to me like the switch is sending out some periodic traffic of its own. The ACE link transmits the exact same size packets at a constant rate of 48k packets/second, irrespective of audio, control usage, etc.

    Are you able to filter the traffic based on source MAC address? Wireshark should recognise the Allen & Heath OUI and show eth.src as ‘AllenHea_xx:xx:xx’. I suppose it would be more interesting to filter based on ‘eth.src != ‘, to find out what if any ‘extra’ packets are ending up on the ACE link.

    Another thing I have found is that when connecting a PC to use Wireshark, it can be very difficult to prevent the PC from sending out packets of its own. Presumably you have recorded this traffic using a port mirroring function on the switch?

    Hope this helps

    – Jeff, A&H

    2013/03/04 at 9:34 pm #33331
    Profile photo of jeffs7jeffs7
    Participant

    Jeff,

    Actually, this was not recorded through a switch. It was the mixrack ACE port through a crossover directly into the computer’s gigabit NIC.

    I did filter the results in Wireshark to the source MAC of the mixrack only, but I am fuzzy on the whether the graph shows the filtered or unfiltered results. I will try to repeat the procedure later and generate a packets-per-second graph at the same time.

    One possible theory that was advanced to me by A&H tech support was that the computer is interacting with the test due to its inability to keep up.

    ~Jeff

    2013/03/05 at 11:23 am #33340
    Profile photo of ahjeffahjeff
    Moderator

    Hi Jeff

    Yes, tech support asked me about this yesterday. I will now keep my responses to this issue in your tech support ticket, to avoid any confusion from having two separate threads.

    – Jeff, A&H.

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