The primary space where data processing equipment is located. It requires strict environmental control, raised flooring (or overhead distribution), and optimized airflow.
The standard supports a variety of cabling media to support current and future applications (like 40G and 100G Ethernet). tia-942-b
TIA-942-B contains several informative annexes that provide additional guidance: The primary space where data processing equipment is located
However, the standard is not without its challenges. Critics argue that strict adherence can be prohibitively expensive, especially for smaller organizations that do not require 99.995% uptime. Tier IV certification, with its fully redundant systems, can double or triple construction costs compared to a Tier II facility. Additionally, TIA-942-B is a design and construction standard, not an operational one. A perfectly certified data center can still fail due to human error, poor maintenance, or a cyberattack. Thus, it is best understood as a critical foundation—the "hardware" of reliability—that must be complemented by robust operational procedures (such as those in ITIL or SOC 2). or a cyberattack. Thus
TIA-942-B defines four "Rated Infrastructure" levels (often referred to as Tiers) regarding redundancy and reliability. These are defined in .