What is the Mikrotik CRS112-8P-4S-IN?
The Mikrotik CRS112-8P-4S-IN is a SFP optical transceiver module, listed by the manufacturer as "Gigabit Ethernet Smart Switch with PoE-out, 4x SFP cages, 400MHz CPU, 128MB RAM, desktop case, RouterOS L5". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.