OSI/AS Configuration and Management Manual

OSI/AS Configuration and Management Manual—424119-001
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Introduction
The Compaq Open Systems Interconnection/Application Services (OSI/AS) subsystem
is a collection of software components that allow Compaq NonStop systems to function
as open systems in standard OSI networks. Compaq OSI/AS provides the following:
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ACSE (Association Control Service Element) services in the Application Layer
(Layer 7)
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Presentation Layer (Layer 6) services
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Session Layer (Layer 5) services
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Transport Layer (Layer 4) services, using the underlying Compaq Open Systems
Interconnection/Transport Services (OSI/TS) subsystem
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Network Layer (Layer 3) and Data Link Layer (Layer 2) services, using, for WANs,
the X.25 Access Method (X25AM) and NonStop TCP/IP subsystem, or, for LANs,
the Tandem LAN Access Method (TLAM) subsystem (for D-series releases) or the
Port Access Method (PAM) subsystem (for G06 and above releases)
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Configuration and management services, provided by an OSI manager process that
includes full configuration and control of the Layer 4, Layer 5, Layer 6, and ACSE
Layer 7 processes and protocols, and selected control and monitoring of lower-layer
processes
This section explains some important terms and ideas that will help give you a basic
understanding of the OSI/AS subsystem. It covers the following major topics:
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OSI/AS Architecture on page 1-2
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OSI/AS Subsystem Components on page 1-5
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OSI/AS Services to User Applications on page 1-9
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Implemented Standards on page 1-11
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Configuration and Management Tools on page 1-13
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G-Series and D-Series Compatibility on page 1-19
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Software Requirements on page 1-18
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G-Series and D-Series Compatibility on page 1-19
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Communication Between D-Series and G-Series Systems on page 1-21