To understand the significance of the "C" revision, one must look at the trajectory of the standard.
ANSI/TIA-942-C – Telecommunications Infrastructure Standard for Data Centers Published: June 2022 Purpose: Defines requirements and guidelines for data center infrastructure, including: tia-942-c pdf
: Updated guidelines for 400G and 800G high-speed data transmission and fiber-dense architectures. To understand the significance of the "C" revision,
TIA-942-C maintains the classification system for data center reliability but clarifies the criteria to distinguish it from the Uptime Institute’s Tier system. The standard defines four "Rated" infrastructure levels: tia-942-c pdf