Browse Prior Art Database

MAPOS 16 - Multiple Access Protocol over SONET/SDH with 16 Bit Addressing (RFC2175)

IP.com Disclosure Number: IPCOM000002733D
Original Publication Date: 1997-Jun-01
Included in the Prior Art Database: 2019-Feb-15
Document File: 6 page(s) / 8K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

K. Murakami: AUTHOR [+1]

Related Documents

10.17487/RFC2175: DOI

Abstract

This memo documents MAPOS 16, a multiple access protocol for transmission of network-protocol datagrams, encapsulated in HDLC frames with 16 bit addressing, over SONET/SDH. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 32% of the total text.

Network Working Group K. Murakami Request for Comments: 2175 M. Maruyama Category: Informational NTT Laboratories June 1997

MAPOS 16 - Multiple Access Protocol over SONET/SDH with 16 Bit Addressing

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 MAPOS 16, a multiple access protocol for transmission of network-protocol datagrams, encapsulated in HDLC frames with 16 bit addressing, over SONET/SDH. The primary difference with MAPOS version 1 is that it has 16 bit address field that offers significant wide address space. 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 MAPOS 16, Multiple Access Protocol over SONET/SDH with 16 Bit Addressing, for transmitting network-protocol datagrams over SONET/SDH. The primary difference with MAPOS version 1 is that it has 16 bit address field that offers significant wide address space. It first describes the major differences between MAPOS and MAPOS 16 briefly. Then, it explains the header format and its 16 bit address format.

1. Introduction

MAPOS is a multiple access protocol for transmission of High-level Datalink Control (HDLC) frames over the Synchronous Optical Network / Synchronous Digital Hierarchy(SONET/SDH)[1][2][3][4]. It provides multiple access capability to SONET/SDH, an inherently point-to-point link.

MAPOS version 1[5] focuses on the frame format compatibility with the conventional PPP[6], resulting with its narrow 8 bit address field. In contrast to MAPOS version 1, MAPOS 16 has a 16 bit address space.

Murakami & Maruyama Informational [Page 1]

RFC 2175 MAPOS 16 June 1997

In this document, header format and its 16 bit format are described. It also explains that 16 bit addressing has minimal influence on the conventional MAPOS protocol family such as Node-Switch Protocol[7] and Switch-Switch Protocol[8].

2. MAPOS 16 Frame Format

Like MAPOS version 1, MAPOS 16 framing is based on the HDLC-like framing used in PPP-over-SONET/SDH, described in RFC-1662[6]. However, the address field is extended to 16 bits, and the control field in the MAPOS version 1 is omitted for maintain the 32bit alignment of the header.

Figure 2 shows the MAPOS 16 frame format. Logical Link Control (LLC), and Sublayer/Sub-Network Access Protocol (SNAP) are not used. It does not include the bytes for transparency. The fields are transmitted from left to right.

+----------+---------------------+----------+ | | | | | Flag | Address | Protocol | | 01111110 | 16bits | 16 bits | +----------+---------------------+----------+ +-------------+------------+----------+----------- | | | | Inter-frame | Information | FCS | Flag | fill or next | | 16/32 bits | 01111...

Processing...
Loading...