# [OmniOS-discuss] ixgbe: breaking aggr on 10GbE X540-T2

Stephan Budach stephan.budach at jvm.de
Fri Jan 20 15:01:01 UTC 2017

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    Hi,

    after having messed around with quite a lot of Cat6a cables from
    different vendors, it seems that the 2m runs are too short. Maybe the
    Intel controllers are providing too much power to the jacks. I have now
    exchanged the 2m/3m cables with 5m ones and this seems to do the trick.

    I know, that there will be some crosstalk at the cables' either ends and
    I learned that even sophisticated measurement equipment will discard the
    results for the first 2m of a Cat6a 10GbE connection. However, having to
    deal with 5m runs is anything but convinient, if you do have quite a
    number of cables to deploy.

    I am still monitoring the NICs, though… ;)

    Cheers,
    Stephan
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