2Giga Ethernet Managed 4 Band VDSL IP DSLAM USER’S MANUAL Ver. A.4
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Setup VLAN Name=UserA, VID=21, select member ports 1 & 26
Select Untag or Tag Setup. Unless the device (computer or switch) which connect to port 1 or port 26 can support Tagging
VLAN, otherwise select Untag.