Configuring and Managing Host-Based X.25 Links - Edition 6 (36939-90057)

Introduction

Host-Based X.25 and PAD Configuration Concepts

Chapter 1

Host-Based X.25 and PAD Configuration Concepts

Host-based X.25 connections are configured using the Node Management

Configuration Manager (NMMGR). NMMGR allows you to completely configure both

PAD support and system-to-system X.25 connections. For more information on NMMGR

and its operation, see Using the Node Management Services (NMS) Utilities manual.

This section explains the principles of:

• configuring PAD incoming security

• configuring a DTC for PAD connections

• configuring X.25 system-to-system switching.

NOTE Because each PTT has different PSN limitations and requirements, it is not possible to

list them all in this manual. We recommend that you use the procedures in Chapter 3 to

configure X.25.

NOTE X.25 levels 1, 2, and 3 must be configured for PAD support to function if this is a

managed DTC.

X.25 on the DTC has two main uses:

• connecting terminals, printers and other devices to systems via packet switching

networks (PSNx)

• connecting HP 3000 systems to each other (System-to-System connections) via

packet switching networks (PSNx).

Most of the information that you must enter for X.25 levels 1, 2, and 3 is on the

subscription form for the PSN to which you are connecting; you must use the subscribed

values when you configure a board.

The DTC Technical Reference Manual contains more information on the way X.25 has

been implemented in the DTC. However, it deals only with the points in which the DTC

implementation differs from the CCITT standards. Values that cannot be changed from

the DTC Manager are as recommended by the CCITT. Refer to the CCITT

recommendations for more information.

Configuring with NMMGR

DTS Configuration Branch

NMMGR takes you down specific configuration “branches” to allow you to enter

configuration values required by various subsystems or products. The DTS branch

allows you to configure the Datacommunications And Terminal Subsystem (DTS),

which defines the physical connections and configuration parameters for the computer,

its DTCs, and all DTC-connected devices.

If you are configuring only PAD support, you need only traverse the DTS branch of

NMMGR. You will use this branch to configure both locally connected devices and PAD

connected devices. To access this branch of NMMGR, from the Main screen, answer “N”