IMC Networks Giga-AcessEtherLinx-II - Manual (Page 16)

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Mode 1—Untagged Frames Only
In this mode, the unit functions as a managed MAC layer switch with management
only accepted on the fiber Uplink and no VLAN support.
Mode 2—Mixed Tagged and Untagged Frames (Default)
When Management can be VLAN tagged, the following screen is given for
configuration.