RFC 1967 (rfc1967) - Page 1 of 18

PPP LZS-DCP Compression Protocol (LZS-DCP)

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Network Working Group                                       K. Schneider
Request for Comments: 1967                                  ADTRAN, Inc.
Category: Informational                                        R. Friend
                                                         Stac Technology
                                                             August 1996


               PPP LZS-DCP Compression Protocol (LZS-DCP)

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.

Abstract

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

   The PPP Compression Control Protocol [2] provides a method to
   negotiate and utilize compression protocols over PPP encapsulated
   links.

   This document describes the use of the Stac LZS data compression
   algorithm for compressing PPP encapsulated packets, using a DCP
   header [6].  This protocol is an enhanced version of the non-DCP
   (Option 17) PPP Stac LZS compression protocol [5], and will be
   referred to as the LZS-DCP Compression Protocol.

Table of Contents

     1.     Introduction ..........................................    2
        1.1       Licensing .......................................    3
        1.2       Specification of Requirements ...................    3
        1.3       Terminology .....................................    3
     2.     LZS-DCP Packets .......................................    4
        2.1       Example LZS-DCP Packets .........................    5
        2.2       Padding .........................................    6
        2.3       Reliabliity and Squencing .......................    6
        2.4       Data Expansion ..................................    6
        2.5       Packet Format ...................................    7
           2.5.1  PPP Protocol ....................................    7
           2.5.2  DCP-Header ......................................    8
           2.5.3  History Number ..................................    9
           2.5.4  Sequence Number .................................    9
           2.5.5  Data ............................................   10
           2.5.6  Longitudinal Check Byte .........................   10



Schneider & Friend           Informational
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