HP X.25/9000 Programmer's Guide

2 Chapter1

Introduction to X.25 Programmatic Access

Introduction

This chapter introduces the X.25 product and the X.25 programmatic

access (X.25/PA) interface. Using the X.25 programmatic access

interface, application programs can control X.25 packet transmission

(level 3 of the Open Systems Interconnectivity (OSI) model).

This chapter contains three parts:

• X.25 product description

• Using BSD IPC

• Getting started with X.25 programmatic access

All X.25 programmatic access is through Berkeley Software Distribution

Interprocess Communication (BSD IPC) facilities (also known as

Berkeley Sockets).

NOTE Throughout this manual, the term card refers to physical

communications hardware, interface and port are used

interchangeably to designate the physical point of connection for

communications, and device is a logical entity (internal to the

communications software) that is logically associated with a particular

interface or card.

36960-90061.bk Page 2 Friday, November 10, 2000 3:42 PM