52 port gigabit | 48x Giga LAN | 4x SFP+ 10G | 48,3 cm ( 19 inch ) 48 ports Gigabit Layer2+ switch architecture (ports 1~48). 4 ports SFP+ 10G slots for optional GBICSs compatible (ports 48~52) Supports SFP DDM & cable diagnostics Supports G.8032 ERPS, self-detection time < 20 ms Supports 1588 V2. 0, transparent clock Supports port aggregation 4KV surge protection, 6KV contact/8KV air ESD protection 48,3 cm ( 19 inch ) angle or wall/table mounting possible