http://www.rfc-editor.org/rfc/rfc2043.txt
RFC 2043: The PPP SNA Control Protocol (SNACP), A. Fuqua1996-10-01T23:00:00-00:00This document defines the Network Control Protocols for establishing and configuring Systems Network Architecture (SNA) over PPP and SNA over LLC 802.2 over PPP. [STANDARDS-TRACK]