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Functional Description
20G025A00 E3

2017-04-20 Page 47
3.13 PCI Express
Rear I/O connection
The following PCI Express links are available at the G25A’s rear I/O connectors:

Two PCI Express 3.0 x8 links

Two PCI Express 3.0 x4 links

Four PCIe 2.0 x1 links
If the G25A is used in a peripheral slot, the interfaces on the CompactPCI Serial
connectors are switched off.
Connection of Gigabit Ethernet controller
The controller for the four Gigabit Ethernet channels at the rear is permanently
connected via one PCIe 2.0 x2 link.
Refer to the CompactPCI Serial standard PICMG CPCI-S.0 for the exact position of the
PCI Express ports on the rear I/O connectors. See Chapter 3.14 CompactPCI Serial on
page 48 .