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PPP Serial Data Transport Protocol (SDTP)
RFC 1963

Document type: RFC - Informational (August 1996; No errata)
Document stream: IETF
Last updated: 2013-03-02
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IESG State: RFC 1963 (Informational)
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Network Working Group                                       K. Schneider
Request for Comments: 1963                                    S. Venters
Category: Informational                                     ADTRAN, Inc.
                                                             August 1996

               PPP Serial Data Transport Protocol (SDTP)

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.

   This document describes a new Network level protocol (from the PPP
   point of view), PPP Serial Data Transport Protocol, that provides
   encapsulation and an associated control protocol for transporting
   serial data streams over a PPP link.  This protocol was developed for
   the purpose of using PPP's many features to provide a standard method
   for synchronous data compression.  The encapsulation uses a header
   structure based on that of the ITU-T Recommendation V.120 [2].

Table of Contents

     1.     Introduction ..........................................    2
     2.     SDTP Packets ..........................................    3
        2.1       Padding .........................................    4
        2.2       Packet Formats ..................................    4
     3.     Serial Data Control Protocol ..........................   11
     4.     SDCP Configuration Option Format ......................   12
        4.1       Packet-Format ...................................   13
        4.2       Header-Type .....................................   13
        4.3       Length-Field-Present ............................   14
        4.4       Multi-Port ......................................   14
        4.5       Transport-Mode ..................................   15
        4.6       Maximum-Frame-Size ..............................   16
        4.7       Allow-Odd-Frames ................................   16
        4.8       FCS-Type ........................................   17
        4.9       Flow-Expiration-Time ............................   18
     SECURITY CONSIDERATIONS ......................................   19

Schneider & Venters          Informational                      [Page 1]
RFC 1963                        PPP SDTP                     August 1996

     REFERENCES ...................................................   19
     CHAIR'S ADDRESS ..............................................   20
     AUTHORS' ADDRESSES ...........................................   20

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 data in
   DSU/CSUs.

   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 [4-10], PPP provides an
   interoperable method of employing data compression on a point-to-
   point link.

   This document provides a PPP encapsulation for serial data,
   specifying a transport protocol, PPP Serial Data Transport Protocol
   (PPP-SDTP), and an associated control protocol, PPP Serial Data
   Control Protocol (PPP-SDCP).  When these protocols are added to above
   mentioned PPP protocols, PPP can be used to provide compression of
   serial data on a point-to-point link.

   This first edition of PPP-SDTP/SDCP covers HDLC-like synchronous
   serial data and asynchronous serial data.  It does this by using a
   terminal adaption header based on that of ITU-T Recommendation V.120
   [2].  Support may be added in the future for other synchronous
   protocols as the marketplace demands.

   The V.120 terminal adaption header allows transported data frames to
   be split over several packets, supports the transport of DTE port
   idle and error information, and optionally supports the transport of
   DTE control state information.

   In addition to the V.120 Header, fields can be added to the packet
   format through negotiation to provide support for features not
   included in the V.120 header.  The extra fields are: a Length Field,
   which is used to distinguish packets in compound frames, and a Port
   field, which is used to provide multi-port multiplexing capability.

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