The DGS-3130 Series switches are Lite Layer 3 Stackable Managed Switches designed to connect end-users in a secure enterprise or metro Ethernet access network. These switches support multicast, and enhanced security, making them an ideal Gigabit access layer solution. The DGS-3130-54TS provides 48 10/100/1000 Mbps Gigabit Ethernet ports. The DGS-3130-54PS provides 48 10/100/1000 Mbps Power over Ethernet (Po E) Gigabit Ethernet ports. The DGS-3130-54S provides 48 SFP Gigabit Ethernet ports. Each 10/100/1000 Mbps port on the DGS-3130-54PS supports the 802.3af & 802.3at Po E standards. The default power budget for these models is 370 watts & can be expanded to 740 watts with the DPS-700 RPS. The switches are also equipped with an USB (Universal Serial Bus) 2.0 port, allowing the user to boot images & upload configuration files directly from, as well as conveniently save syslog files onto a USB (Universal Serial Bus) 2.0 storage device.