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PPP Stac LZS Compression Protocol (RFC1974)

IP.com Disclosure Number: IPCOM000004259D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 17 page(s) / 42K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R. Friend & W. Simpson: AUTHOR

Abstract

The Point-to-Point Protocol (PPP) [1] provides a standard method for transporting multi-protocol datagrams over point-to-point links.

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 6% of the total text.

Network Working Group R. Friend

Request for Comments: 1974 Stac Electronics

Category: Informational W. Simpson

DayDreamer

August 1996

PPP Stac LZS Compression Protocol

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.

The PPP Compression Control Protocol [2] provides a method to

negotiate and utilize compression protocols over PPP encapsulated

links.

This document describes the use of the Stac LZS data compression

algorithm, with single or multiple compression histories, for

compressing PPP encapsulated packets.

Table of Contents

1. Introduction .......................................... 2

1.1 Licensing ....................................... 2

1.2 Specification of Requirements ................... 3

2. LZS Packets ........................................... 3

2.1 Padding ......................................... 4

2.2 Zero Deletion/Insertion ......................... 4

2.3 Reliability and Sequencing ...................... 4

2.3.1 Reset-Request and Reset-Ack Packet Formats....... 5

2.4 Data Expansion .................................. 6

2.5 Packet Format ................................... 6

2.5.1 PPP Protocol .................................... 7

2.5.2 History Number .................................. 7

2.5.3 Check Value ..................................... 7

2.5.3.1 LCB ........................................ 7

2.5.3.2 CRC ........................................ 7

2.5.3.3 Sequence Number ............................ 8

2.5.3.3.1 History Synchronization with Sequence

Numbers Example ...................... 9

2.5.4 History Synchronization Procedure ............... 10

2.5.5 Compressed Data ................................. 11

3. Sending Compressed Datagrams .......................... 12

3.1 Transmitter Process ............................. 12

3.2 ...