User`s guide

Signamax ™ 065-7931 16-Port 10/100/1000BaseT/TX Web Smart Switch
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Untag State:
If you checked this function for a Tag out port, the packet form this port
may be tag out. But, the packet would be untag out if the VID of its tag is
the same as the value of ”Untag VID” while Untag VID state is Enable.
Untag VID:
Valid range is 0~4094.
Fig. 4-10