The Spirent pX3/dX3 Quad-Speed 400/200/100/50GbE appliance is the industry’s highest-density QSFP-DD tester, says the company, supporting eight ports in a 1RU-high rack space. The Spirent 400GbE system enables customers to accurately emulate real-world TCP/UDP traffic, scaling up to millions of users and connections. Each port supports 1x400GbE, 2x200GbE, 4x100GbE, or 8x50GbE. Technicians can use the appliance to conduct performance, stress, and industry-standard benchmark tests.