Why does ethtool report Transceiver external on Mellanox mlx4_en driver?

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Issue

Why does ethtool report Transceiver external on Mellanox mlx4_en driver?
I have seen sometimes this is external and sometimes internal, is that a problem?

# ethtool ethX
Settings for ethX:

        Transceiver: external

Environment

Red Hat Enterprise Linux 6
Mellanox ConnectX InfiniBand card
mlx4_en driver

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