CONTENTS

  Title Page

  Copyright Page

  Preface

  1      Preparations for Problem Solving

  1.1     Introduction

  1.2     Problem Solving Tools
    1.2.1      NCL
    1.2.2      Event Logging
    1.2.3      Entity Attributes
    1.2.4      Common Trace Facility
    1.2.5      Loopback Tests

  1.3     Using This Manual

  1.4     First Steps

  1.5     How to Proceed

  2      X.25 Problems

  2.1     Introduction

  2.2     Event Messages

  2.3     VAX P.S.I. Load Errors

  2.4     VAX P.S.I. Fails to Load

  2.5     DEC X25gateway Does Not Load

  2.6     Local DTE Fails
    2.6.1      DTE Restart Failure
    2.6.2      Link Set Up Failure
    2.6.3      Line Set Up Failure

  2.7     Incoming Calls Cannot Be Received on Native or Multihost Systems

  2.8     Incoming Calls Cannot Be Received on Client Systems

  2.9     Outgoing Calls Cannot Be Made

  2.10    A User Application Program Fails

  2.11    Virtual Circuit Fails

  3      X.29 and PAD Problems

  3.1     Introduction

  3.2     SET HOST/X29 Does Not Work

  3.3     An Established X.29 Call Clears Unexpectedly

  3.4     X.29 Applications Fail to Connect

  3.5     X.29 Calls Clear Unexpectedly on a Host System

  A   Loopback Testing

  A.1     Testing the X.25 Line

  A.2     Testing the DECnet Circuit
    A.2.1      Loopback on LAPB Circuits

  B   Reporting Problems to Digital

  B.1     Introduction

  B.2     Details of the Software

  B.3     Details of the Problem

  B.4     Copying System Dump Files

  FIGURES

  A-1        Loopback Testing on an X.25 Line

  TABLES

  2-1        Events

  A-1        STARTLOOP MODEM CONNECT LINE MODE Options

  A-2        LOOP MOP Optional Arguments