The HP ProCurve Switch 3500 Series consists of the most advanced intelligent edge switches in the HP ProCurve Networking product line. The 3500 series includes 24-port and 48-port stackables. The foundation for all these switches is a purpose-built, programmable ProVision ASIC that allows the most demanding networking features, such as Quality of Service (QoS) and security, to be implemented in a scalable yet granular fashion.