Configuring Systems for Terminals, Printers, and Other Serial Devices (32022-90057)

Introduction

Typical Network Configurations

Chapter 1

PAD Access

DTCs can optionally contain up to three DTC/X.25 Network Access cards. DTC/ X.25

Network Access cards connect devices to computers over a Packet Switching Network

(PSN), by using a private or public PAD.

A PAD, or Packet Assembler/Disassembler, is a device that converts asynchronous

character streams into packets that can be transmitted over a PSN. Supported devices

attached to the DTC can be remotely connected using a PAD.

Figure 1-2 shows PAD access to HP 3000 and other computers using a DTC equipped

with the DTC/X.25 Network Access card. Note that only terminals are connected to the

public PAD. This is because devices that are opened using the software, such as serial

printers, must be connected to a private PAD and must be permanently associated with

a reserved logical device (ldev) number on the MPE/iX that accesses them.

Figure 1-2 DTC/X.25 Network Access for a PAD

PAD terminals and Printer

PAD terminals

OpenView

DTC Manager

Workstation

HP e3000

Series 900

HP e3000

Series 900

X.25

Network

Public

PAD

DTC X.25

2335 PAD