RFC 1549 (rfc1549) - Page 1 of 18
PPP in HDLC Framing
Alternative Format: Original Text Document
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
Simpson
