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HiGig is a proprietary protocol that is implemented by Broadcom. The HiGig protocol supports various switching functions like quality of service (QoS), link aggregation, and others. The physical signaling across the interface is XAUI, four differential pairs for receive and transmit (SerDes), each operating at 3.125 Gbit/s. HiGig+ is a higher rate version of HiGig. HiGig can be compared to the Interlaken protocol.