D-Link 504T Setup Manual page 5

Step 10.
Select PPPoE/PPPoA and then select 'next'.
Step 11.
Enter the Username and Password issued to you by your internet service
provider. Leave the VPI and VCI settings as the default values. The
connection type needs to be PPPoE LLC. Select 'Next'.
Default settings-
VPI = 8
VCI = 35
5