ObsoletedPROPOSED STANDARDIETF stream

RFC 1139: Echo function for ISO 8473

This RFC has been replaced. Do not implement against it for new work — it was formally obsoleted by RFC 1574, RFC 1575.

Current document in this lineage: RFC 1574 — Essential Tools for the OSI Internet; RFC 1575 — An Echo Function for CLNP (ISO 8473)

In plain English — editorial summary, not part of the RFC

This memo defines an echo function for the connection-less network layer protocol. Two mechanisms are introduced that may be used to implement the echo function. The first mechanism is recommended as an interim solution for the Internet community. The second mechanism will be progressed to the ANSI X3S3.3 working group for consideration as a work item. When an ISO standard is adopted that provides functionality similar to that described by this memo, then this memo will become obsolete and superceded by the ISO standard. This memo is not intended to compete with an ISO standard. [STANDARDS-TRACK]

Document record

Document ID: RFC1139
Published: January 1990
Authors: R.A. Hagens
Status: PROPOSED STANDARD
Stream: IETF
Area: osi
Pages: 6
Also known as: —

Obsoleted by:: RFC 1574, RFC 1575

Standards lineage

This document is one revision in a chain of 3 RFCs, each formally replacing the one before it.

Read the full history of An Echo Function for CLNP (ISO 8473) →

Referenced by

2 later RFCs formally update or obsolete part of this document.

Also filed under

About this page

The document record above — title, authors, date, status, stream, area, relationships, DOI and errata — is imported verbatim from the public RFC Editor index. The “in plain English” section is editorial: written by The metasystema editorial team, not part of the RFC. Where the two differ, the RFC text governs.

Last checked against the RFC Editor index on 23 August 2026. RFCs are never revised after publication; changes are issued as new documents.

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