Communications Subsystems; When To Use This Section - HP NonStop NS-series Operation Manual

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Communications Subsystems:

Monitoring and Recovery

When to Use This Section

Communications Subsystems
Local Area Networks (LANs) and Wide Area Networks (WANs)
Monitoring Communications Subsystems and Their Objects
Monitoring the SLSA Subsystem
Monitoring the WAN Subsystem
Monitoring the NonStop TCP/IP Subsystem
Monitoring Line-Handler Process Status
Tracing a Communications Line
Recovery Operations for Communications Subsystems
Related Reading
When to Use This Section
Use this section to determine where to find more information about monitoring and
recovery operations for communications devices such as ServerNet adapters, printers,
and spoolers; communications lines; and communications processes such as WAN
IOPs.
Communications Subsystems
The software that provides users of Integrity NonStop systems with access to a set of
communications services is called a communications subsystem. Because connectivity
is an important part of online transaction processing (OLTP), HP offers a variety of
communications products that support a wide range of applications.
Communication between specific devices or networks is typically achieved using
several communications products or subsystems. These products are related as
components in a layered structure. To accomplish the required connection, higher-level
components—for example, NonStop TCP/IP processes—use the services of lower-
level components such as the ServerNet LAN Systems Access (SLSA) subsystem.
The same higher-level component can often use any of several lower-level
components; thus, the Expand subsystem—which consists of multiple processes on a
node—can use the NonStop TCP/IP subsystem, the X.25 Access Method (X.25 AM),
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