The DGS-3620 Series of next generation Layer 3 Gigabit switches deliver performance, flexibility, security, multi-layer Qo S & access control, along with redundant power solutions for SMBs & enterprises. With high Gigabit port densities, Gigabit SFP & 10-Gigabit SFP+ support, & advanced software solutions, these switches can act as either departmental access layer devices or core switches to form a multilevel network structured with backbone & centralized high-speed servers. Service providers can take advantage of the high SFP density switches to structure the cores of Fibre to the Building (FTTB) networks that they extend to the subscribers sites. The DGS-3620 Series is embedded with two different software images, the Standard Image (SI) & the Enhanced Image (EI). The Standard Image provides fundamental features for campuses & enterprises such as switching, routing, multicasting, advanced Quality of Service (Qo S), & robust security features. The Enhanced Image supports OAM, BGP, IPv 6 dynamic routing & tunneling, which are all suitable for the service provider network. Easily deployed & simple to manage, the DGS-3620 can be virtually stacked with any switch that supports D-Links Single IP Management (SIM) to form a multi-level network structured with backbone & centralized high-speed servers. The virtual stack can include units located anywhere on the same network domain, eliminating cable distance barriers, limitations of physical stacking, & the need for stack cabling. Alternatively, depending on whether linear or fault-tolerant ring stacking is implemented, users can use one or two 10-Gigabit SFP+ ports to create a physical stack. Switches in the stack are hot-swappable to minimize network downtime in case a replacement is required, eliminating single points of failure. Up to 12 units or 576 Gigabit ports can be configured for a stack using direct attached cables allowing high bandwidth & high port densities on the already cost