The Point-to-Point Protocol (PPP)
This document defines the PPP organization and methodology, and the PPP encapsulation, together with an extensible option negotiation mechanism which is able to negotiate a rich assortment of configuration parameters and provides additional management functions. [STANDARDS-TRACK]
PPP in HDLC-like Framing
This document describes the use of HDLC-like framing for PPP encapsulated packets. [STANDARDS-TRACK]