Celestica Smallstone XP D4040 R0854-F0004-02 is a 32-port data center Ethernet switch that uses QSFP connectors to deliver 40 GbE links per port. The device is part of Celestica's Smallstone XP family and carries the model designation D4040 with the part number R0854-F0004-02. Retail listings describe it explicitly as a 32-port data center switch with 32 QSFP ports and 40G capability. This 32x40G design signals a high-density data center interconnect option suited for deployments that demand substantial bandwidth per link.
