The Quad Serial Gigabit Media Independent Interface (QSGMII) is a method of combining four SGMII lines into a 5Gbit/s interface. QSGMII, like SGMII, uses LVDS signalling for the TX and RX data and a single LVDS clock signal.
QSGMII uses significantly less signal lines than four SGMII busses.
Read more about this topic: Media Independent Interface
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