Lenovo Intel X520 Product Manual page 8

Standards supported
Both the Intel X520 and Intel X540 adapters support the following IEEE standards:
IEEE 802.1p Class of Service (CoS) traffic prioritization
IEEE 802.1Q VLAN tagging
IEEE 802.3ad Link Aggregation Control Protocol
IEEE 802.3x Full-duplex flow control
The Intel X540 adapters supports the following standards:
IEEE 802.3u 100BASE-TX Fast Ethernet
IEEE 802.3ab 1000BASE-T copper twisted pair Gigabit Ethernet
IEEE 802.3an 10GBASE-T copper twisted pair 10 Gb Ethernet
The Intel X520 adapters supports the following standards:
IEEE 802.3ae 10GBASE-SR short range fiber optics 10 Gb Ethernet
10GSFP+Cu SFP+ Direct Attach copper
The following figure shows the Intel X540 ML2 Dual Port 10GbaseT Adapter for those System x servers
with an ML2 adapter slot.
Figure 5. Intel X540 ML2 Dual Port 10GbaseT Adapter
Intel X520 and X540 Dual Port 10 GbE Adapters for System x and ThinkServer 8