What is the meaning of the VLAN mode of the Pon stick?

Auto:Automatically identify ISP’s vlans.

Transparent:The ONU VLAN type Transparent is the extended application of traditional VLANs. 

• When untag packet comes from the PC, ONU will permit and forward the packet to OLT without VLAN ID.
• When untag packet comes from OLT, ONU will permit and forward the packet to the PC without VLAN ID.
• When packet with the VLAN tags comes from the switch, ONU will permit and forward the packet to OLT with VLAN IDs.
• When packet with the VLAN tags comes from OLT, ONU will permit and forward the packet to switch with VLAN IDs.

PVID: Enable PON STICK to work on a network where the upstream line has a VLAN and the downstream line uses an untag network.