The SmartBits SmartMetrics XD modules offer Dual Media Ethernet connections on every test port. The user can select a 10/100/1000 Mbps connection or a Gigabit Ethernet Fiber connection on each port. Each XD module can simulate the millions of clients and servers necessary to fully stress test a device or network. The SmartBits test system can scale from 2 ports up to 768 test ports. Requires SFP Transceiver for Gigabit Ethernet Fiber testing, order ACC-6025A for Multimode (850 nm) or ACC-6026A for Singlemode (1310 nm).