Digital test equipment, namely, impairment generators for digital computer network equipment to be used for protocol conformance and compliance testing, protocol functionality testing, syntactic testing, load testing, code-path testing, performance testing, robustness testing, all by sending and receiving digital data packets some or all of which may have been modified, synthesized, delayed, reordered, duplicated, or otherwise impaired individually or in conjunction with other digital data packets; Computer networking hardware, namely, computer networking hardware for testing digital computer networks by sending and receiving digital data packets; Computer programs in the field of engineering for testing new products for engineers via global computer network; Computer programs for testing computer network programs and products for design engineers, product developers, software quality engineering and assurance engineers and program testers, and manuals sold as a unit; and Electronic test and measurement devices for use in the fields of networks and telecommunications, namely, network emulation devices for testing computer hardware, software, applications, networks, and peripheral devices