Nikon D4S - Manual (Page 69)

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❚❚Power Saving
Choose Prioritize network speed for faster
network speeds, Prioritize power saving for
reduced power consumption. Prioritize
network speed ensures that LAN
connections remain active even when data
are not being exchanged with the server and allows Ethernet
connections using the high-speed 1000BASE-T standard.
Prioritize power saving ensures that LAN connections are
terminated automatically when data transfer ends and limits
Ethernet connections to 100BASE-TX.