This switch is an indoor variation of the prominent netFiber 9 switch - used by many small and medium ISPs for reliable 10 Gigabit fiber connections stretching over a 100 meters. With five 1G SFP ports, four 10G SFP+ ports, and an additional Gigabit Ethernet port, this is the perfect upgrade for existing CRS212 setups. You're getting the modern ARM v7 CPU, a large capacity of RAM, and better cooling. The Marvell switch-chips bring phenomenal performance to the table!
The Gigabit Ethernet port has a direct connection to the switch chip - so you can enjoy full Gigabit speed there. And it supports PoE-in, giving you an additional powering option in tricky spots.
You can mount this switch in a standard 1U rack to keep everything organized. And it has all the power you would expect from a rackmount device: CRS310 supports hardware offloaded VLAN- filtering. And even some hardware offloaded Layer-3 routing.
CRS310-1G-5S-4S+IN is a fantastic tool for anyone working with indoor connections over 100 meters while keeping data loss and ping low. Optical fiber can be a great alternative to copper if you are worried about electromagnetic interference, tampering or eavesdropping.