Table of Contents

Introduction

Remote Terminal Connection

Packet Assembler/Disassembler

X.25 Fast File Transfer

X.25 Applications Programmer Interface (API)

Autodialer Control

Incoming Call Control

Call Accounting

Network Operations Tools

Components

X.25 Link Configuration

Introduction

Configuration File Location

File Structure

Link Configuration with tsgconfig

Changing Link Startup Behaviour

Dialup X.25 (X.32) Configuration

CCITT V.25bis

Establishing a Connection

Avoiding Premature Disconnection

Avoiding Dial Out Hang Ups

Dynamic DTE/DCE Selection

Dial Parameters

X.25 Link Configuration for TCP/IP

Local X.25 Address

Operation with Dial-up X.25 (X.32)

X.25 Link Configuration Parameters

Devices and X.25 Virtual Circuits

Management Devices

X.25 Account Logging

Special Purpose Devices

X.25 Virtual Circuits as Serial Ports

Incoming Calls As login Ports

Adding More login Ports

Interaction With A Remote PAD

X.25 Incoming Call Control

Introduction

How the x25daemon Works

x25tab File Description

Call ID

Disposition

Reverse

Function

Using the Daemon to Enhance System Security

Selecting Calls Based on Calling Address

Checking for Passwords in Call User Data

x25incalls File Sample

Supplied Environment Variables

X.25 Troubleshooting

Troubleshooting Tools

Using tsgstat

Displaying Link Configuration Information

Displaying Frame Level Statistical Information

Displaying Device Level Statistical Information

Using tsgtrace to Display X.25 Link Data

Displaying the Incoming Call Activity Log

Testing Your X.25 Link

Making Sure the Lower Levels (HDLC and Electrical) Work

Making a Call

Taking X.25 Calls

Preventing Call Failures

Communication Performance Problems

Communication Line Problems

X.25 Insufficient Buffer Space

Link Too Slow

System Startup Scripts

Startup Log Files

X.25 Cause and Diagnostic Bytes

X.25 Cause Bytes

XIP Causes

X.25 Diagnostic Bytes

Standard CCITT Diagnostic Bytes (0x00 to 0x7F)

XIP Packet Level Diagnostic Bytes and xip_causes (0x80 to 0xE7)

Reserved Diagnostic Bytes (0xE8 to 0xFF)

Obtaining Technical Support