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+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].
+
+
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+Maruyama &  Murakami         Informational                      [Page 1]
+
+RFC 2172                         MAPOS                         June 1997
+
+
+2. Protocol Field Assignments
+
+   The MAPOS Version 1 Data Link Layer [1] contains a 16 bit Protocol
+   field to identify the the encapsulated protocol.  The Protocol field
+   is consistent with the ISO 3309 (HDLC) extension mechanism for
+   address fields.  All protocol numbers MUST be assigned such that the
+   least significant bit of the most significant octet equals "0", and
+   the least significant bit of the least significant octet equals "1".
+
+   Assigned MAPOS Protocol Numbers
+
+      Value (in hex)  Protocol Name
+
+      0001-001F       Not Used - reserved
+      0021            MAPOS Version 1 Internet Protocol Version 4 [8]
+      0023-FCFF       Not Used - reserved
+      FE01            MAPOS Version 1 Address Resolution Protocol (ARP[8])
+      FE03            MAPOS Version 1 Node Switch Protocol (NSP[9])
+      FE05            MAPOS Version 1 Switch Switch Protocol (SSP[10])
+      FE07-FEFF       Not Used - reserved
+
+
+References
+
+   [1]   Murakami, K. and M. Maruyama, "MAPOS - Multiple Access Protocol
+         over SONET/SDH, Version 1," RFC-2171, June 1997.
+
+   [2]   CCITT Recommendation G.707: Synchronous Digital Hierarchy Bit
+         Rates (1990).
+
+   [3]   CCITT Recommendation G.708: Network Node Interface for
+         Synchronous Digital Hierarchy (1990).
+
+   [4]   CCITT Recommendation G.709: Synchronous Multiplexing Structure
+         (1990).
+
+   [5]   American National Standard for Telecommunications - Digital
+         Hierarchy - Optical Interface Rates and Formats Specification,
+         ANSI T1.105-1991.
+
+   [6]   Simpson, W., editor, "PPP in HDLC-like Framing," RFC-1662,
+         July 1994.
+
+   [7]   Postel, J., "Internet Protocol (IP)," RFC-791, September 1981.
+
+   [8]   Murakami, K. and M. Maruyama, "IPv4 over MAPOS Version 1,"
+         RFC-2176, June, 1997.
+
+
+
+
+Maruyama &  Murakami         Informational                      [Page 2]
+
+RFC 2172                         MAPOS                         June 1997
+
+
+   [9]   Murakami, K. and M. Maruyama, "A MAPOS version 1 Extension -
+         Node Switch Protocol," RFC-2173, June, 1997.
+
+   [10]  Murakami, K. and M. Maruyama, "A MAPOS version 1 Extension -
+         Switch Switch Protocol," RFC-2174, June, 1997.
+
+Acknowledgements
+
+   The authors would like to acknowledge the contributions and
+   thoughtful suggestions of John P. Mullaney, Clark Bremer, Masayuki
+   Kobayashi, Paul Francis, Toshiaki Yoshida, and Takahiro Sajima.
+
+Author's Address
+
+     Mitsuru Maruyama
+     NTT Software Laboratories
+     3-9-11, Midori-cho
+     Musashino-shi
+     Tokyo-180, Japan
+     E-mail: mitsuru@ntt-20.ecl.net
+
+     Ken Murakami
+     NTT Software Laboratories
+     3-9-11, Midori-cho
+     Musashino-shi
+     Tokyo-180, Japan
+     E-mail: murakami@ntt-20.ecl.net
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+Maruyama &  Murakami         Informational                      [Page 3]
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