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 aggregation switches to form a multilevel network structured with backbone & centralised high-speed servers. Service providers can take advantage of the high SFP density switch (such as DGS-3420-28SC) to structure the aggregation of Fiber to the Building (FTTB) networks that are extended to the subscribers sites.