OSI/TS SCF Reference Manual

Examples of Command Files
OSI/TS SCF Reference Manual—424832-001
C-12
Single TSP Process Supporting Multiple X25AM
Lines
Because transport connect requests can arrive on any of the lines at any time, there must
be at least one transport connect 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 and an example command file.
Advantages
The most obvious advantage is that this is a simple configuration. The operation and
management of one TSP process is straightforward.
Limitations
This type of configuration has the following limitations:
•
Fault tolerance. A Single TSP process can also be the single point of failure. Any
problem with this one process, or with the CPU in which it runs, affects the whole
application.
•
Load distribution. There is no way to balance the load in the Transport Layer. The
single TSP process may become a bottleneck for the application.
•
Resources. A single TSP has limited resources. The buffer pool space of one TSP
process is limited to about 2 megabytes. This may not be sufficient to support a
large number of requesters. In addition, the maximum number of connections is a
limiting factor when using a single TSP process.
Figure C-3. Large Application Configuration: Single TSP for Multiple X25AM Lines
Transport Layer
Network Layer
025
$TSP1
Data Link Layer
$X25A
(X25AM)
$X25B
(X25AM)
$X25C
(X25AM)
$X25D
(X25AM)