Allied Telesis AT-S39 - Manual (Page 125)

AT-S39 User’s Guide
125
Each VLAN has been assigned a unique VID. You assign this number
when you create a VLAN.
The ports have been assigned PVID values. A port’s PVID is assigned
automatically by the management software when you create the VLAN.
A PVID is the same as the VID to which the port is an untagged member.
In the example, each VLAN has one port connected to the router. The
router interconnects the various VLANs and provides access to the WAN.