OSI/AS Configuration and Management Manual

Installing and Configuring the Subsystem
OSI/AS Configuration and Management Manual—424119-001
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One TSP Process Supporting Each X25AM Line
One TSP Process Supporting Each X25AM Line
In this configuration, each X25AM line is controlled by a separate TSP process; one or
more TAPS processes use each TSP process. Figure 4-6 illustrates this type of
configuration.
Because transport connect requests can arrive on any line at any time, there must be at
least one transport attach outstanding on one of the TSP subdevices for each X25AM
line.
The following subsections contain a discussion of the advantages and limitations of this
type of configuration, as well as an example command file.
Advantages
This type of configuration has the following advantages:
Figure 4-6. Large Application Configuration: Single TSP for Each X25AM Line
Fault tolerance Problems with any one process cannot disrupt the whole
application. Any faulty process can be restarted and the full
throughput restored in a short time.
Load distribution It is possible to balance the load between processes.
Resources Additional resources can be made available at any time, even
online, by increasing the number of TAPS or TSP processes.
Startup time The startup time is usually shorter than in the previous
configuration because each process only works with its own
portion of the total number of subdevices.
046CDT .CDD
$TAPS1
$TAPS2
$TAPS3
$TAPS5
$TAPS4 $TAPS6
$TAPS7
$TAPS8
$TAPS9
Application Layer (ACSE)
Presentation Layer
Session Layer
Transport Layer
Network Layer
$TSP1 $TSP2 $TSP3 $TSP4
$X25A
(X25AM)
$X25B
(X25AM)
$X25C
(X25AM)
$X25D
(X25AM)
Data Link Layer