Introduction to Networking for NonStop S-Series Servers

Open Systems Interconnection (OSI) Network
Connections
Introduction to Networking for HP NonStop S-Series Servers—520670-005
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HP NonStop OSI Advantages
HP NonStop OSI Advantages
HP NonStop OSI products have several key features that make them a strong platform
for OSI applications—including application services such as X.400, electronic data
interchange (EDI), and FTAM. Some of the features that make HP NonStop OSI a
good choice are summarized here.
General-Purpose Session Implementation
HP NonStop OSI products include a general-purpose implementation of the Session
Layer. (Some Session Layer products available elsewhere are specialized for certain
applications. HP NonStop OSI is suited to a very large range of applications.) The HP
product supports both versions of the session protocol—called versions 1 and 2—and
all but one functional unit (session expedited data) defined for the Session Layer.
Support for All Transport Classes
HP NonStop OSI products also include a robust implementation of the Transport Layer,
including support for all five transport classes defined in the standard. This feature
makes HP NonStop OSI compatible with many kinds of network environments.
RFC-1006 Standard Implementation
HP NonStop OSI/AS and OSI/TS implement the Request for Comments (RFC) 1006
standard entitled ISO Transport Service on Top of the TCP, Version 3. This standard,
developed for the Internet community, defines how the ISO transport service can be
implemented on top of the Transmission Control Protocol (TCP), which is a Transport
Layer protocol.
Using the RFC-1006 standard, OSI applications such as X.400 and FTAM (and other
OSI/AS or OSI/TS applications) that communicate over OSI/AS and OSI/TS can
communicate with other servers and clients over a TCP/IP network connection.
Configuration Flexibility
HP NonStop OSI products provide a great variety of configuration options, such as a
wide range of line attributes and operational parameters. Because of this flexibility,
your applications can interoperate with applications and services running on other, less
flexible, systems.
Transparent Support for LANs and WANs
HP NonStop OSI products can run over either the PAM or X25AM subsystems. With
PAM, HP NonStop OSI provides access to networks complying with the Institute of
Electrical and Electronics Engineers (IEEE) 802.4 standard. With X25AM, you gain
access to X.25 packet-switched data networks (PSDNs). You use the same application
program interface (API) regardless of the underlying network type.