Browse Prior Art Database

Reliable link layer protocols (RFC0935)

IP.com Disclosure Number: IPCOM000004351D
Original Publication Date: 1985-Jan-01
Included in the Prior Art Database: 2000-Oct-11
Document File: 12 page(s) / 30K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J.G. Robinson: AUTHOR

Abstract

This RFC is motivated by recent RFCs 914 and 916, which propose new standards for protocols that transfer serial data reliably over asynchronous communication lines. In this note, I summarize widely-used standards that have been in existence for some time that might be appropriate for this environment. I hope that the existing standards will be found to meet the needs the new proposals seek to address.

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Network Working Group J. Robinson

Request for Comments: 935 BBN

January 1985

RELIABLE LINK LAYER PROTOCOLS

Status of This Memo

This RFC discusses protocols proposed recently in RFCs 914 and 916,

and suggests a proposed protocol that could meet the same needs

addressed in those memos. The stated need is reliable communication

between two programs over a full-duplex, point-to-point communication

link, and in particular the RFCs address the need for such

communication over an asynchronous link at relatively low speeds.

The suggested protocol uses the methods of existing national and

international data link layer standards. This RFC suggests a

proposed protocol for the ARPA-Internet community, and requests

discussion and suggestions for improvements. Distribution of this

memo is unlimited.

Introduction

This RFC is motivated by recent RFCs 914 and 916, which propose new

standards for protocols that transfer serial data reliably over

asynchronous communication lines. In this note, I summarize

widely-used standards that have been in existence for some time that

might be appropriate for this environment. I hope that the existing

standards will be found to meet the needs the new proposals seek to

address.

In both the US and international standards areas, there are two major

categories of serial data communication standards for the link layer.

These categories are character-oriented and bit-oriented. The first

is the older class; it is standardized in the US standard ANSI

X3.28-1976 (which superseded the original version of 1971), and in

the ISO standards IS 1745, IS 2111, IS 2628 and IS 2629. Although

frequently used in synchronous environments, wherein the name binary

synchronous (or bisynch) is used, these standards use the term "basic

mode" to describe their procedures. The latter class is standardized

in the US standard ADCCP (Advanced Data Communication Control

Procedures), ANSI X3.66- 1979, and in the ISO standard HDLC

(High-level Data Link Control procedures), in IS 3309, IS 4335 and IS

7809.

Other international standards, draft standards and vendor standards

follow the ADCCP/HDLC procedures. Among these are SDLC (IBM), X.25

LAPB (CCITT), IEEE 802.2/ISO 8802.2 LLC (LAN Logical Link Control)

and ISDN LAPD (CCITT). Many vendors have built equipment which meets

RFC 935 January 1985

Reliable Link Layer Protocols

the character-oriente...