DGS-1210-52,  48  x  10/100/1000Mbps  Ports,  4  x  Combo  1000BaseT/Mini-GBIC  SFP  ports,  Advance  power  saving  features,  Fanless  design,  IEEE  802.3x  Flow  Control,  802.3ad  Link  Aggregation,  Asymmetric  VLAN,  Auto  Voice  VLAN,  802.1p  priority  queues,  MAC/IP  filtering,  MAC/IP-based  ACL,  802.1X  port-base  Access  Control,  Port  Security,  D-Link  Safequare  Engine,  Smart  Console  Utility,  web  based  management,  compact  CLI,  D-View  6.0  support,  19"  Rackmount  Installation