geostationary telecommunications satellites electronic telephone set ...

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duction and putting the package into
service is described in detail in figs.
3 and 4.
Planning
When carrying out the initial planning
a list is compiled—the project specification—of
the exchange software
functions, expressed in terms of the
blocks that are applicable for the exchange.
This is based on the program
library. If the desired functions cannot
be realized with existing blocks, the
design of new blocks is initiated.
The project specification constitutes
the input document. The exchange can
then be dimensioned with the aid of
this document and the actual traffic
values.
Computer-stored block information—
for example programs in source code
language—for the blocks included in
the project specification is transferred
to the newly formed or existing project
files for the exchange, with the aid of
the APS system. Only certain information,
such as size, references etc., is
transferred for the standard operating
system concerned, since this system
can be used unchanged in all exchanges.
The APT blocks are then brought together
in the project file to form larger
handling blocks—models. An example
of this is the programs for central handling
functions, programs stored on peripheral
media such as magnetic tapes
etc. Normally, earlier models for other
exchanges or program packages can
be utilized directly or after modification,
in which case they are transferred
from the program library or from a
project file.
The next step is to take out, on the
basis of the specific relationships for
theexchange ir question, theexchange
parameters, i.e. initial data, which can
be established at the time that the program
package is generated. An example
of this is the required sizes of
various data storage areas, which in
their turn depend on the size of the exchange.
Another example is the control
information for selection of the re-
Preparation of
the exchange data
Production of
delivery package
Generation of
exchange data
tables and complete
load tape in
the customer's
exchange
Fig. 4
The exchange data is added to the program
package and the resulting software package
is put into service
Testing and putting
into service
LT
Load tape