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⟦b9e6736ad⟧ Wang Wps File
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Derivation
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CHAPTER 6
Page #
DOCUMENT III TECHNICAL PROPOSAL Apr. 29, 1982
LIST OF CONTENTS Page
6. SOFTWARE CHARACTERISTICS....................
6.1 Introduction................................
6.1.1 Design Goals...............................
6.1.2 Network Topology............................
6.1.3 C-NODE Software Structure...................
6.5 Communications Environment..................
6.5.1 Commmunication User Environment (CUE).......
6.5.1.1Session-Conversion Management...............
6.5.1.1.1 Session-Conversation Establishment..........
6.5.1.1.2 Session-Conversation Data Transfer..........
6.5.1.1.3 Session-Conversation Termination............
6.5.2 Data Trasmission Environment...............
6.5.2.1 DTrE Services...............................
6.5.2.2 Datagram Services (DGS).....................
6.5.2.2.1 Addressing Structure........................
6.5.2.2.2 Datagram Format............................
6.5.2.2.3 Datagram Primitives.........................
6.5.2.2.4 Datagram Routing............................
6.5.2.2.5 Flow and Congestion Control.................
6.5.2.3 Virtual Transport Connecion Service (VTCS).
6.5.2.3.1 VTCS Standards..............................
6.5.2.4 Data Link Environment.......................
6.8 Internal Network Access Software............
6.8.1 ACDN Interfaces............................
6.8.2 Network Interface...........................
6.8.3 Modules of the Internal Network Access S/W..
6.8.3.1 The ICC Module..............................
6.11 Network Management Host Software............
6.11.1 NH Interfaces and Functional Overview......
6.11.2 Software Development and Maintenance Functions
6.11.3 Maintenance of the Data Base................
6.11.4 Data Base Management System User Groups.....
6.11.5 Data Base Managemet Tools..................
6.11.6 Report Generation...........................
6.11.7 Network Modelling Software and Support for
Automatic Network Tests.....................
6.11.8 Network Testing by Means of ATES............
6.12 Electronic Mail Software Package............
6.12.1 Interfaces to the EMH.......................
6.12.2 Functional Description of the EMH .......... …86…1
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6. S̲O̲F̲T̲W̲A̲R̲E̲ ̲C̲H̲A̲R̲A̲C̲T̲E̲R̲I̲S̲T̲I̲C̲S̲
This section attempts to present a comprehensive view
of the software structure supporting the proposed ACDN.
To assist in understanding the implied oftware linkages,
certain typical and relevant data flow descriptions
are presented.
The primary design objectives for the networking software
provided by Christian Rovsing has been:
- a realistic adherence to the proposed architecture
for OpenSystems Interconnection
- a well conceived strategy to exploit the inherent
architectural strength of the CR80 environment.
(this is illustrated by software components BTS
& BDS)
- exploitation of the program development environment
supported b PASCAL.
Over and above these considerations, certain aspects
of software structuring have been adopted that facilitates
understanding in terms of mainframe communication architecture
like IBM's SNA and Univac's DCA.…86…1 …02… …02… …02…
…02…
6.1 I̲n̲t̲r̲o̲d̲u̲c̲t̲i̲o̲n̲
The software proposed for the ACDN is anchored on existing
networking solutions from Christian Rovsing,and is
supported by the system software for the CR80,namel
DAMOS.
Section 6.2 introduces the functions and facilities
of DAMOS.
Section 6.3 focuses on a key internal transport mechanisms
designated as Basic Transport Service (BTS) and Basic
Datagram Service (BDS) that is a part of the DAMOS
Kernel.
Section 6.4 introduces data flow aspects and table structures.
This section provides a first level bridge between concepts
introduced in Chapter 3 and functional software description
that follows in 6.5 to 6.11.
Section 6.5 to 6.11 describes thesoftware complexion
and functions of NSS, TAS, HAS, interfaces to other
networks, NCS and Network Management Subsystem.
Section 6.12 presents the electronic mail system oriented
software capabilities.…86…1 …02… …02… …02… …02…
6.1.1 D̲e̲s̲i̲g̲n̲ ̲G̲o̲a̲l̲s̲
The Christian Rovsing network solution is designed
to create a communication mechanism to support a wide
range of user applications, host computer systems and
nterconnect technologies. Specifically, the goals
are the following:
1. C̲r̲e̲a̲t̲e̲ ̲a̲ ̲C̲o̲m̲m̲o̲n̲ ̲U̲s̲e̲r̲ ̲I̲n̲t̲e̲r̲f̲a̲c̲e̲:̲ The application
interface to the network should support a broad
spectrum of application communication requirements
and should be common acros the varied implementations.
Within such a network environment, applications
may be moved among the systems in the network,
with the common interface hiding the internal characteristics
and topology of the network.
2. S̲u̲p̲p̲o̲r̲t̲ ̲a̲ ̲W̲i̲d̲e̲ ̲R̲a̲n̲g̲e̲ ̲o̲f̲ ̲C̲o̲m̲
