Cisco QSGMII Specification.pdf
TheQuadSerialGigabitMediaIndependentInterface(QSGMII)isdesignedtosatisfythefollowingrequirements:
•Convey4portsofnetworkdataandportspeedbetweena10/100/1000PHYandaMACwithsignificantlylesssignalpinsthanrequiredforGMII&SGMII.
•Operateinbothhalfandfulldupl
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