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The Base Interface can only be 10BASE-T, 100BASE-TX, or 1000BASE-T [[Ethernet]]. Since all boards and hubs are required to support one of these interfaces there is always a network connection to the boards.
The Fabric is commonly [[SerDes]] Gigabit Ethernet, but can also be [[Fibre Channel]], [[XAUI]] 10-Gigabit [[Ethernet]], [[InfiniBand]], [[PCI Express]], or Serial [[RapidIO]]. Any Fabric that can use the point-to-point 100 Ω differential signals can be used with an AdvancedTCA backplane.
The [[PICMG]] 3.1 [[Ethernet]]/[[Fibre Channel]] specification has been revised to include [[IEEE]] 40GBASE-KR4 signaling to the existing IEEE 10GBASE-KX4, IEEE 10GBASE-KR, and [[XAUI]] signaling. Switch boards using the 40GBASE-KR4 signaling were successfully tested in four different manufacturer's shelves at a recent ATCA Interoperability Workshop.
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