The Summit X670 series is available in two models: Summit X670V and Summit X670. Summit X670V provides high density for 10 Gigabit Ethernet switching in a small 1RU form factor. The switch supports up to 64 ports in one system and 448 ports in a stacked system using high-speed SummitStack-V160, which provides 160 Gbps throughput and distributed forwarding. The Summit X670 model provides up to 48 ports in one system and up to 352 ports in a stacked system using SummitStack-V longer distance stacking technology (up to 40 km with 10GBASE-ER SFP+) .