OPNET Technologies Co., Ltd. engages in the business of research, development, production, manufacturing, and selling optical fiber broadband user access network systems; synchronous and asynchronous digital transmission multiplexers; high-speed, asymmetric, and symmetric of digital subscriber loop system; broadband modem; router and access system; broadband wireless communication equipment; digital data and voice integrated access equipment; optical fiber communication system; and the system planning, construction, and after-sales service. It operates through the following segments: Access Network and Broadband Equipment; Transmission Equipment; and Other. The Access Network and Broadband Equipment segment produces equipment for the user terminal and the telecom operator and connects the user terminal equipment to the telecom operator switch or other network equipment. The Transmission Equipment segment includes optical communication transmission equipment between telecom operators and connects each telecom operator switch or other network equipment. The Other segment focuses on trading of high-end photoelectric conversion imaging equipment, sales of optical fiber network passive components, and sales of raw materials. The company was founded in 1991 and is headquartered in Hsinchu, Taiwan.