An Oversubscription Ratio expresses how much more downstream capacity a switch tier offers to servers than upstream capacity it has toward the fabric, such as 3:1 meaning three times more access bandwidth than uplink. It is a deliberate cost trade-off that works when hosts rarely burst at once, but AI and HPC fabrics push toward 1:1 to avoid congestion.
Category: Network & Connectivity · Subcategory: Data Center Network Architecture · Part of the AIDC Technical Terminology reference.