Foxconn NFPIK8AA-8EKRS - Manual (Page 46)

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Chapter 2 Installation Instructions
Common Mode Level Select Jumper(for CK8-04-PRO): J1G1
This jumper is used to select common-mode level range for PCI Express external
reference clock input pins.
Recovery Jumper: J1E1
This jumper is reserved for technology support, please do not change the jumper.
Common
mode below
VDD/2
(Default)
Common
mode above
VDD/2
J1G1
1
2
Open
Closed
1
2
J1E1