Network Working Group M. Maruyama Request for Comments: 2172 K. Murakami Category: Informational NTT Laboratories June 1997 MAPOS Version 1 Assigned Numbers Status of this Memo This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Authors' Note This memo documents the parameters used in the Multiple Access Protocol over SONET/SDH Version 1. This document is NOT the product of an IETF working group nor is it a standards track document. It has not necessarily benefited from the widespread and in-depth community review that standards track documents receive. Abstract This document describes the protocol parameters used in the Multiple Access Over SONET/SDH (MAPOS) version 1. MAPOS is a link layer protocol and provides multiple access capability over SONET/SDH links. 1. Introduction Multiple Access Protocol over SONET/SDH (MAPOS) [1] is a high-speed link-layer protocol that provides multiple access capability over SONET(Synchronous Optical Network)/SDH(Synchronous Digital Hierarchy)[2][3][4][5]. Its frame format is based on the HDLC-like framing [6] for PPP. A component called "Frame Switch" [1] allows multiple nodes to be connected together in a star topology to form a LAN. Using long haul SONET/SDH links, the nodes on such a "SONET-LAN" can span over a wide geographical area. The Internet Protocol (IP) [7] datagrams are transmitted in MAPOS HDLC frames [8]. This document describes the protocol parameters used in MAPOS version 1 [1]. Maruyama & Murakami Informational