What term does ISO use to define the performance of balanced twisted-pair cabling?

The term "Class" is the correct choice used by ISO to define the performance of balanced twisted-pair cabling. In the context of ISO/IEC standards, particularly the ISO/IEC 11801 standard for generic cabling, categorical performance is categorized into different classes that specify the minimum performance requirements for cabling relationships in premises cabling systems. Each class is defined by specific parameters such as bandwidth, maximum channel length, and other relevant characteristics that dictate the performance levels of the cabling installation.

Understanding this terminology is crucial as it helps in identifying and ensuring compatibility among different cabling products and systems according to established performance criteria. The distinction made by ISO allows designers and installers to select appropriate cabling that meets the desired performance for specific applications within structured cabling systems, thereby ensuring optimal network performance and reliability.