Requirements for OT networks differ significantly from those for IT networks. While IT networks are required to provide high throughput and dynamic growth, OT networks must emphasize reliability, robustness, guaranteed maximum latency and minimum bandwidth. Data in OT networks are transmitted by means of relatively slow lines, employing time-tested technologies known for their high durability. MPLS/TP technology has become a new standard for OT networks in recent years, replacing the currently used TDM technologies. Its main benefits include full operator control over a deterministic setup of every OT-network connection, including the above-mentioned requirements and their monitoring.
The term OT has been employed to demonstrate technological and functional differences between traditional IT systems and industry-standard control systems. OT includes use of computers for the purpose of monitoring or changing system's physical condition, including power generation and distribution control systems, railroad network control systems, manufacturing control systems, etc. OT network components namely include SCADA (Supervisory Control and Data Acquisition) systems, distributed control systems (DCS) and programmable logical controls (PLC).