The System Interface Table is an RML systems model that details the communication between two systems from a business stakeholder’s point of view. Instead of a technical point of view, where message formats, character encoding or information about how a transaction occurs is included, the System Interface Table describes what information has to be transferred, how often, and how much. A template of the System Interface Table is given below.
Learn more about requirements models in our book Visual Models for Software Requirements (Microsoft Press, 2012) Joy Beatty and Anthony Chen. (See Chapter 18 for System Interface Tables)