I. B. +  M. A.  DE  LANDE  LONG

Telecommand Decoder Shell package - Detailed description

Software Interfaces

The Telecommand Decoder Shell is a software package, designed to be built into a software system for a telecommand application. The part of the software system which lies outside the Shell is called the Telecommand Decoder Environment. The API (Application Programming Interface) consists of function calls between the Environment and the Telecommand Decoder Shell.

Telecommand interfaces in the API
(shown by left-to-right arrows in the diagram)

The Environment calls the Shell to:

The Shell calls the Environment to deliver packets and other data units to the Environment.

Telecommand Decoder Shell software i/f

Management interfaces in the API
(shown by downwards arrows in the diagram)

The Environment calls the Telecommand Decoder Shell to:

The Telecommand Decoder Shell calls the Environment for storage allocation and for the optional logging of messages.

Other interfaces in the API

In addition to the function calls shown in the diagram, the Shell has interfaces for the optional features:


Telecommand Decoder Shell Package

The Telecommand Decoder Shell package consists of:

A telecommand system built with this package is likely to cost very much less than independent development of an equivalent capability.

Licensing and support may be negotiated according to requirements. All the telecommand features are included in the standard Telecommand Decoder Shell licence. The ESA Telecommand Authentication and the SLSI security interface are licensed as optional extras. The Built-In-Failures capability is available on request.

The Telecommand Decoder Shell consists of approximately 8,000 lines of C code divided into about 120 modules. All code is written in ANSI/ISO 9899-1990 C and is highly modular and easy to maintain. The code makes no use of any library calls. It is therefore easily portable to different computer architectures.

It has been demonstrated running on processors from HP, Intel, Motorola, Silicon Graphics, Sun and many others.

The code has been compiled by several independent ANSI C compilers and the demonstration program produces identical results in each case.

Please contact us for further information on technical questions or licensing conditions for the Telecommand Decoder Shell package.

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