Raritan Computer DOMINION KX II DKX2-0E-E - Manual (Page 210)

Network Speed Settings
196
Legend:
Does not function, as expected
Supported
Functions; not recommended
NOT supported by Ethernet specification; product will communicate, but
collisions will occur
Per Ethernet specification, these should be “no communication”, however, note
that the Dominion KX II behavior deviates from expected behavior
Note: For reliable network communication, configure the Dominion KX II and
the LAN switch to the same LAN Interface Speed and Duplex. For example,
configure both the KX II and LAN Switch to Autodetect (recommended) or set
both to a fixed speed/duplex such as 100Mbps/Full.