ZyXEL Communications ES-4024A - Manual (Page 128)

ES-4024A Series Switch Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
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operating.
What is so called "Dual-Personality interface" in Ethernet Switching?
Dual-Personality GbE interface means that one 1000Base-T Copper port and
one SFP port share the same physical interface. Only one of them can be used
at one of a time. Dual-Personality interface is also called "Combo Port" in
some cases.