# System Initialization Parameters

System Initialization Parameters, which are processed as input during the creation of the Substation ES region, dictate how various components operate.

System Initialization Parameters are defined in two partitioned data set (PDS) member files that are coded as 320-byte records, as follows:

- The `SSP` member

  Specifies the configuration of the logging and tracing device that pertains to Substation ES.

- The `SSI` member

  Specifies the configuration of the identification and operational parameters.

  Substation ES contains default values for the members, which you must configure to suit the requirements of a given site. For the configuration parameters and their values, see TIBCO Substation ES Installation.

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