A cable rack for a cable backplane system includes a tray having a plurality of plates defining a frame and surrounding a raceway. Cable connector assemblies are held by the tray with each having a plurality of cables extending between at least two cable connectors and routed in the raceway. Each cable connector is positioned between and is supported by corresponding plates. At least one cable strain relief component is held by the tray. Each cable strain relief component is positioned between and is supported by corresponding plates of the tray independent of the cable connectors. Each cable strain relief component provides strain relief for the associated cables. Optionally, the cable connectors are loosely held by the tray and float relative to the tray with a predefined limited amount of movement relative to the tray and relative to the at least one cable strain relief component.