IPricot IPR-S1000 - Manual (Page 62)

Configuring the IPR-S1000
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In the first drop-down menu, select auto or manual. In the second drop-down
menu, select the input interface for satellite packets.
Click on the Accept changes button.
14. PPP
Definition: Point-to-Point Protocol. A data link protocol that provides
dialup access over serial lines by encapsulating protocols in
specialized network protocol packets.