The standard retains the 4-tier classification for redundancy and fault tolerance:
Assuming you have obtained the official document, here is a chapter-by-chapter breakdown of what the 500+ pages contain. tia942c pdf full
The standard classifies data centers into based on their resiliency (Rate 1 to Rate 4). It mandates structured cabling across five key areas: TIA's ANSI/TIA-942 Standard | TIA Online tia942c pdf full
