X25AM Management Programming Manual

X25AM Management Programming Manual—528037-001
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1 Introduction
X.25, a recommendation of the International Telegraph and Telephone Consultive
Committee (CCITT), is an international standard for packet-switching networks that
defines the relationship between data terminal equipment (DTE) and data circuit-
terminating equipment (DCE). HP provides a software package called the X.25 Access
Method (X25AM), that manages remote data communications in a packet-switching
mode. Once X25AM is installed on your system, you can connect to public X.25
packet-switching networks or to another system using X.25.
This section contain these topics:
Objects Controlled by the X25AM Subsystem
In the X25AM subsystem, a NonStop system communicates with X.25 networks and
other NonStop systems over physical communications lines. Each of these lines is
controlled by an I/O process.
X25AM binds each virtual circuit, whether permanent or switched, to a subdevice,
which is actually a named file in the GUARDIAN file system. Several subdevices can
share a single communications line.
The X25AM subsystem controls these line-handler processes, lines, and subdevices.
Required Management Functions
To manage the objects that make up the X25AM subsystem, you must be provided
with the capability to do the following:
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Define certain characteristics, or attributes, of lines and subdevices.
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Find out the current values of the attributes of lines and subdevices.
•
Determine the current states of lines and subdevices.
•
Initiate the operation of lines and subdevices.
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Terminate the operation of lines and subdevices.
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Add subdevices to and remove subdevices from the subsystem.
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Control whether or not other applications can open subdevices.
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Change the system resources used by line-handler processes.
Topic Page
Objects Controlled by the X25AM Subsystem
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Required Management Functions 1-1
Relationship with Other Subsystems 1-2
Architecture of the X25AM Subsystem 1-2