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OSI/AS Configuration and Management Manual

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Introduction
OSI/AS Configuration and Management Manual—424119-001
1-7
NSP Processes
NSP Processes
NSP processes handle the OSI Network Layer and Data Link Layer protocols. X25AM
or TCP/IP NSP processes provide Network Layer services, and TLAM NSP processes
(for D-series releaes) or PAM and SLSA processes together (for G06 and above
releases) provide Data Link Layer services to the TSP processes within the same
OSI/AS subsystem. Each line controlled by an NSP process can support multiple
simultaneous transport connections.
NSP processes run as privileged I/O processes in the NonStop Kernel operating system
environment. Each NSP process is associated with a particular hardware controller
board and controls a particular physical line into the communications subnetwork. NSP
processes must run in the processors to which the subnetwork controller boards are
attached. The processes are otherwise independent of the location of other subsystem
components.
If your OSI/AS subsystem communicates through an X.25 wide area network (WAN),
use the access method X25AM to provide NSP services.
If your OSI/AS subsystem communicates over a local area network (LAN), use the
access method TLAM (for D-series releases) or PAM (for G06 and above releases) to
provide NSP services. Note that an OSI/AS subsystem may be configured to use both
access methods.
The OSI/TS subsystem may use TCP/IP services within the TS layer by mentioning the
TCP/IP as the NSP process. The TCP/IP process may in turn use X.25AM or TLAM
depending on whether the communication is through WAN or LAN.
TSP Processes
TSP processes manage transport connections with remote peer entities. TSP processes
provide Transport Layer services to the TAPS processes within the same subsystem.
TSP processes are network service users and transport service providers
that is, they use the network services provided by the NSP processes to build transport
connections, and they provide transport services to the upper-layer (TAPS) processes.
For LAN subnetworks running the OSI IP, TSP also provides Network Layer services.
Each OSI/AS subsystem contains at least one TSP process. Each TSP process can
manage multiple simultaneous transport connections. TSP processes are nonprivileged
processes that are part of the Compaq OSI/TS subsystem.