The CCIS hardware is a mix of electromechanical, discrete electronic, and new integrated electronic technologies blended together to allow economical conversion of No. 4A/ETS offices while at the same time matching the technology of the electronic toll offices in which it is in corporated.Connectorization and plug-in assemblies help achieve a design that can be readily maintained and administered.
This article describes the elements of the system development environment that support each phase of the 5ESS™ digital switching system product development. The elements themselves are complex hardware/software systems that are specialized to meet the particular needs of the different phases of development but integrated to smooth the transition through the phases. The requirements and design phases are supported by general-purpose UNIX 1 " systems that provide a rich set of tools for document preparation. The design is transformed into executable software for the 5ESS system, primarily in the C programming language, augmented by C-based extension languages to support the special needs of database and diagnostic programming. This software is created, compiled, combined, and packaged for the 5ESS switch test models by large UNIX systems running on IBM System/370-compatible hardware. Unit testing of developed software takes place on smaller support computer systems in an environment that closely resembles the test model. The test models, actual 5ESS switching systems, are used for the integration and system test of the product. A dedicated computer system for each test model supports testing at the C language level. A number of actual and simulated load generators are used to stress and regression test the system. All the support systems are interconnected with high-speed data transmission networks that support remote command execution as well as file transfer.
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