D-Link 48-port managed Ethernet switch, with two 10GbE ports.
Removed from service with a local company, stored a while. Recently booted and logged into to verify condition. Works fine. Fans are kind of loud.
Includes 48 Gigabit ports -- 44 are twisted pair (RJ-45,) while the remaining 4 are optionally either RJ-45 or SFP. Note that these are still Gigabit ports. The switch also has two expansion modules, currently populated with DEM-411T cards, which each provide one 10Gb CX4 port.
Includes rack ears (and I guess it is light enough to be mounted solely by the ears, although I'd rather not.) No cables included. (In particular, I don't actually have any CX4 cables.)