Comtrend Corporation NexusLink 3120 User Manual page 182

F2.1 PPP over ETHERNET (PPPoE) – IPv4
STEP 1: Select the PPP over Ethernet radio button and click Next.
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For tagged service, enter valid 802.1P Priority and 802.1Q VLAN ID.
For untagged service, set -1 to both 802.1P Priority and 802.1Q VLAN ID
Select a TPID if VLAN tag Q-in-Q is used.
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