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PPP over ISDN
RFC 1618

Document type: RFC - Proposed Standard (May 1994)
Document stream: IETF
Last updated: 2013-03-02
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IESG State: RFC 1618 (Proposed Standard)
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Network Working Group                                         W. Simpson
Request for Comments: 1618                                    Daydreamer
Category: Standards Track                                       May 1994

                             PPP over ISDN

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 PPP over Integrated Services
   Digital Network (ISDN) switched circuits.

   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@merit.edu mailing list.

Applicability

   This specification is intended for those implementations which desire
   to use the PPP encapsulation over ISDN point-to-point links.  PPP is
   not designed for multi-point or multi-access environments.

   "It is clear that there is never likely to be a single, monolithic,
   worldwide ISDN." [3] The goal of this document is to describe a few
   common implementations, chosen from the current wide variety of
   alternatives, in an effort to promote interoperability.

Simpson                                                         [Page i]

RFC 1618                     PPP over ISDN                      May 1994

                           Table of Contents

     1.     Introduction ..........................................    1

     2.     Physical Layer Requirements ...........................    1

     3.     Framing ...............................................    3

     4.     Out-of-Band signaling .................................    4

     5.     Configuration Details .................................    5

     SECURITY CONSIDERATIONS ......................................    5

     REFERENCES ...................................................    5

     ACKNOWLEDGEMENTS .............................................    6

     CHAIR'S ADDRESS ..............................................    6

     AUTHOR'S ADDRESS .............................................    6

Simpson                                                         [Page ii]

RFC 1618                     PPP over ISDN                      May 1994

1.  Introduction

   PPP was designed as a standard method of communicating over point-
   to-point links.  Initial deployment has been over short local lines,
   leased lines, and plain-old-telephone-service (POTS) using modems.
   As new packet services and higher speed lines are introduced, PPP is
   easily deployed in these environments as well.

   This specification is primarily concerned with the use of the PPP
   encapsulation over ISDN links.  Since the ISDN B-channel is by
   definition a point-to-point circuit, PPP is well suited to use over
   these links.

   The ISDN Primary Rate Interface (PRI) may support many concurrent B-
   channel links.  The PPP LCP and NCP mechanisms are particularly
   useful in this situation in reducing or eliminating hand
   configuration, and facilitating ease of communication between diverse
   implementations.

   The ISDN D-channel can also be used for sending PPP packets when
   suitably framed, but is limited in bandwidth and often restricts
   communication links to a local switch.

   The terminology of ISDN can be confusing.  Here is a simple graphical
   representation of the points used in subsequent descriptions:

                   +-------+     +-------+     +-------+
               R   |       |  S  |       |  T  |       |   U
               +---+  TA   +--+--+  NT2  +--+--+  NT1  +---+
                   |       |     |       |     |       |
                   +-------+     +-------+     +-------+

   These elements are frequently combined into a single device.

2.  Physical Layer Requirements

   PPP treats ISDN channels as bit or octet oriented synchronous links.
   These links MUST be full-duplex, but MAY be either dedicated or
   circuit-switched.

   Interface Format

      PPP presents an octet interface to the physical layer.  There is
      no provision for sub-octets to be supplied or accepted.  The octet
      stream is applied primarily at the R or T reference points.

Simpson                                                         [Page 1]

RFC 1618                     PPP over ISDN                      May 1994

   Transmission Rate

      PPP does not impose any restrictions regarding transmission rate,

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