It can be used to connect the backplane of the disk cage and the NVMe HBA card array card of the Oculink interface, etc.

Compact, high-speed, next-generation PCIe/SAS interface OCuLink is a supporting specification for PCI Express (PCIe) basic specifications.

The main focus is on internal and external mini PCIe connectors and cables optimized for special customers and mobile market segments. The specification defines the wiring and connector requirements that meet the PCIe Gen 4, 16Gb/s signaling requirements, enabling optical fiber and copper cable technologies to coexist.
Fully comply with SAS and PCIe protocols.

Supports the new PCIe 4.0 specification running at 16Gb/s per channel, and supports pluggable module applications.

Compatible and support the next generation PCI Express 5.0 running at 32 Gbps per channel for future-proofing and minimizing development costs in the next few years.

This OCuLink cable can be used to connect internal devices, e. g. a backplane with SFF-8643 connector to a controller with OCuLink SFF-8611 connector.