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The XGMII can be optionally extended using an XGMII extender known as XAUI (10
Gigabit Attachment Unit Interface). XAUI can be used to drive signals over longer circuit
board trace lengths and it also reduces the number of required signal traces when
compared to XGMII. The positioning of XAUI within the 10 Gigabit Ethernet
architecture is shown in Figure 2.1. The XAUI architecture is explained in greater detail
in the next chapter.
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