D-Link - DGS-1520-52/E 48 PORTS GE + 2 10GE 48 X 10/100/1000BASE-T PORTS 2 X 10GBASE-T PORTS AND 2 X 10G SFP+ PORTS SMART MANAGED SWITCH

D-Link - SWITCH 52 PORTE DI CUI 44 PORTE GE POE + 4 PORTE 2.5 GE POE + 2 PORTE 10 DGS-1520-52MP

Netgear - M4300 52-PORT GB POE+ SWITCH (550W PSU)

Netgear - M4300-52G-POE MANAGED SW APS1000W GSM4352PB-100NES ProSafe Stackable Switch M4300-28G-PoE - Full Managed Gigabit PoE 860W Layer 3 a 24 porte 10/100/1000 Mbit RJ45 PoE (802.3af-802.3at)