Featuring USB-based design, PacketExpert™ provides 4 electrical Ethernet ports, 2 of which can be electrical or optical, enabling testing on optical fiber links as well. With IPLinkSim™ feature, tester emulates bidirectional IP WAN link with varying capacities from 10 Mbps to 1 Gbps for electrical interfaces, and 1,000 Mbps for optical interface using SFP. PacketExpert™ with ExpertSAM application is used to validate service-level agreements as per ITU-T Y.1564 standard with single-test.