Browse Prior Art Database

PPP in HDLC Framing (RFC1549)

IP.com Disclosure Number: IPCOM000002381D
Original Publication Date: 1993-Dec-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 15 page(s) / 34K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

W. Simpson: AUTHOR

Abstract

The Point-to-Point Protocol (PPP) [1] provides a standard method for transporting multi-protocol datagrams over point-to-point links.

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 8% of the total text.

Network Working Group W. Simpson, Editor

Request for Comments: 1549 Daydreamer

Category: Standards Track December 1993

PPP in HDLC Framing

Status of this Memo

This document specifies an Internet standards track protocol for the

Internet community, and requests discussion and suggestions for

improvements. Please refer to the current edition of the "Internet

Official Protocol Standards" (STD 1) for the standardization state

and status of this protocol. Distribution of this memo is unlimited.

Abstract

The Point-to-Point Protocol (PPP) [1] provides a standard method for

transporting multi-protocol datagrams over point-to-point links.

This document describes the use of HDLC for framing PPP encapsulated

packets. This document is the product of the Point-to-Point Protocol

Working Group of the Internet Engineering Task Force (IETF).

Comments should be submitted to the ietf-ppp@ucdavis.edu mailing

list.

Table of Contents

1. Introduction ..................................................2

1.1 Specification of Requirements .................................2

1.2 Terminology ...................................................3

2. Physical Layer Requirements ...................................3

3. The Data Link Layer ...........................................4

3.1 Frame Format ..................................................5

3.2 Modification of the Basic Frame ...............................7

4. Asynchronous HDLC .............................................7

5. Bit-synchronous HDLC ..........................................5

6. Octet-synchronous HDLC ........................................12

APPENDIX A. Fast Frame Check Sequence (FCS) Implementation .........13

A.1 FCS Computation Method ........................................13

A.2 Fast FCS table generator ......................................15

SECURITY CONSIDERATIONS ............................................16

REFERENCES .........................................................17

ACKNOWLEDGEMENTS ...................................................17

CHAIR'S ADDRESS ....................................................18

EDITOR'S ADDRESS ...................................................18

1. Introduction

This specification provides for framing over both bit-oriented and

octet-oriented synchronous links, and asynchronous links with 8 bits

of data and no parity. These links MUST be full-duplex, but MAY be

either dedicated or circuit-switched. PPP uses HDLC as a basis for<...