OT systems are operationally independent from IT systems so that OT operations can be sustained during an outage of IT systems
Context and Guidance: OT systems should be architected in such a way that they are able to continue operations when there is an outage or disruption to IT systems. The organisation should not only implement manual backup processes, but these processes should be tested to ensure that they function as expected. OT systems refer to assets that operate on the OT network segment. These assets might resemble traditional IT assets, except that they support OT operations. When considering this practice, be aware that OT systems are sometimes dependent on IT systems that operate on a separate IT network segment. The intent in this practice is to ensure that service delivery or production activities supported by OT systems can be sustained if IT systems are unavailable for any reason.
Related Practices • Progression: This practice is part of a practice progression. Practice progressions are groups of related practices that represent increasingly complete or more advanced implementations of an activity. The practices in this progression include: ARCHITECTURE-2b, ARCHITECTURE-2d, ARCHITECTURE-2h, ARCHITECTURE-2i, ARCHITECTURE-2j, ARCHITECTURE-2l.