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

Preparing to Configure DTCs
Determine X.25 Connection Characteristics
Chapter 2
45
Determine X.25 Connection Characteristics
You must define characteristics for the X.25 PAD or system-to-system connections you
are configuring. Values need to be configured for each DTC/X.25 Network Access card
mounted in the DTCs for the system you are configuring.
Whether you are configuring system-to-system, PAD connections, or both, you will need
to define values for levels 1, 2, and 3 of the X.25 network. Most of these values are
defined by your X.25 network subscription and you can transfer these values directly to
the DTC X.25 Card Configuration — Level 1 and 2 Worksheet shown later in this
Chapter, and the DTC X.25 Card Configuration — Level 3 and Miscellaneous Worksheet
shown later in this Chapter.
If you are configuring system-to-system connections for an X.25 network, you will need
to define an X.25 link name, the maximum number of SVCs, and remote X.25 addresses
and security designations for each MPE system that will be allowed access through each
X.25 card. Once you have decided on your system-to-system configuration, you can use
the DTC X.25 Card Configuration — System-to-System Worksheet shown later in this
Chapter.
If you are configuring nailed PAD connections, you can use the DTC X.25 Card
Configuration — Nailed PAD Connections Worksheet shown later in this Chapter.
If you are defining nailed PAD connections, you may also wish to configure PAD Incoming Security.
PAD Incoming Security is configured by mapping X.25 addresses of remote PAD devices to Access
Lists. The Access lists contain a list of the local systems to which the calling address is allowed
access. Once you have decided on the security to be configured, use the DTC X.25 Card Configuration
– PAD Access Lists Worksheets shown later in this Chapter, to construct the security lists.