Test System as Reference System. With this system, functional tests may be performed separately from the production environment. Each external system may test its own system changes independently with the test system. In general, two different test system environments shall be available to the participants. The parameters for technical connection may vary for different system environments. – X E/P level shall denote the test infrastructure for participants which is available externally from a perspective of SIX. The test environments shall have different software versions. These are: − XE which shall denote the external test system with the development software version − XP which shall denote the external test system with the production software version
