OSI/TS SCF Reference Manual

Examples of Command Files
OSI/TS SCF Reference Manual—424832-001
C-11
Configuring Large X.25 Applications
Configuring Large X.25 Applications
This subsection describes some options for configuring OSI/TS and X25AM to support
large applications. To control X25AM lines, there are two options:
•
A single TSP process that supports all X25AM lines
•
One TSP process for each X25AM line
The advantages and limitations of each option are described in the following
subsections.
Characteristics of Large Applications
Large application typically have at least some of the following characteristics:
•
The application can be reached by one single address. In other words, the
application is addressed by a single TSEL, which in turn, is addressed by a single
DTE address (or by a single NSAP address).
•
The total number of connections to be supported by the application could possibly
exceed the current limits supported by X25AM (250 circuits in systems using the C-
system version of Guardian; 500 circuits in D-series systems) or could possibly
exceed the current limits supported by OSI/TS (512 connections in most CPUs, or
1024 connections in Cyclone CPUs).
•
The application and the application environment allow the possibility of distributing
the load (in terms of the number of connections or the aggregate bandwidth) over
the underlying hardware and software components.
•
The application environment requires the hot standby approach to provide fault
tolerance. (The hot standby approach is one in which an identical system is ready to
take over if a system fails, but otherwise does no processing.)
Single TSP Process Supporting Multiple X25AM Lines
In this configuration, multiple X25AM lines are controlled by a single TSP process.
Figure C-3, Large Application Configuration: Single TSP for Multiple X25AM Lines
illustrates this type of configuration.