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PPP for Data Compression in Data Circuit-Terminating Equipment (DCE)
RFC 1976

Document type: RFC - Informational (August 1996)
Document stream: IETF
Last updated: 2013-03-02
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IETF State: WG Document
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IESG State: RFC 1976 (Informational)
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Network Working Group                                       K. Schneider
Request for Comments: 1976                                    S. Venters
Category: Informational                                     ADTRAN, Inc.
                                                             August 1996

  PPP for Data Compression in Data Circuit-Terminating Equipment (DCE)

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.  PPP
   defines an extensible Link Control Protocol, and proposes a family of
   Network Control Protocols for establishing and configuring different
   network-layer protocols.

   The PPP Serial Data Transport Protocol (PPP-SDTP) [2] provides a
   standard method for encapsulating and transporting serial data over a
   PPP link.  The PPP Compression Control Protocol [3] provides a
   standard method for selecting and using a compression protocol to
   provide for data compression on a PPP link.

   This document defines a specific set of parameters for these
   protocols and an LCP extension to define a standard way of using PPP
   for data compression of serial data in Data Circuit-Terminating
   Equipment (DCE).

Table of Contents

     1.     Introduction ..........................................    2
        1.1       Specification of Requirements ...................    2
        1.2       Terminology .....................................    3
     2.     Modes of Operation ....................................    3
     3.     PPP Link Control Protocol Extension ...................    4
     4.     Required PPP Elements .................................    4
        4.1       Required Configuration Options and Parameters ...    5
     5.     Mode-1 Requirements ...................................    6
        5.1       Detailed Mode-1 Example .........................    7
     6.     Initial Handshake Operation ...........................    8
     7.     Security ..............................................    9
     8.     References ............................................    9
     CHAIR'S ADDRESS ..............................................    9

Schneider & Venters          Informational                      [Page 1]
RFC 1976                        PPP DCE                      August 1996

     AUTHORS' ADDRESSES ...........................................   10

1.  Introduction

   This document is a product of the TR30.1 ad hoc committee on
   compression of synchronous data.  It represents a component of a
   proposal to use PPP to provide compression of synchronous serial data
   in DSU/CSUs.

   PPP [1] has three main components:

      1. A method for encapsulating multi-protocol datagrams.

      2. A Link Control Protocol (LCP) for establishing, configuring,
         and testing the data-link connection.

      3. A family of Network Control Protocols for establishing and
         configuring different network-layer protocols.

   In addition to providing support for multi-protocol datagrams, the
   Point-to-Point Protocol (PPP) [1] has defined an effective and robust
   negotiating mechanism that can be used on point to point links.  When
   used in conjunction with the PPP Compression Control Protocol [3] and
   one of the PPP Compression Protocols [4], PPP provides an
   interoperable method of employing data compression on a point-to-
   point link.

   The PPP Serial Data Transport Protocol (PPP-SDTP) and the PPP Serial
   Data Control Protocol (PPP-SDCP) [2] have been developed to allow
   serial data to be carried within a PPP packet.  PPP-SDTP uses a
   terminal adaption header based on that of ITU-T Recommendation V.120
   [5].

1.1.  Specification of Requirements

   In this document, several words are used to signify the requirements
   of the specification.  These words are often capitalized.

   MUST      This word, or the adjective "required", means that the
             definition is an absolute requirement of the specification.

   MUST NOT  This phrase means that the definition is an absolute
             prohibition of the specification.

   SHOULD    This word, or the adjective "recommended", means that there
             may exist valid reasons in particular circumstances to
             ignore this item, but the full implications must be
             understood and carefully weighed before choosing a

Schneider & Venters          Informational                      [Page 2]
RFC 1976                        PPP DCE                      August 1996

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