The optical fibers within the cable can be used for high-speed transmission of data, either for the electrical utility's own purposes of protection and control of the transmission line, for the utility's own voice and data communication, or may be leased or sold to. The optical fibers within the cable can be used for high-speed transmission of data, either for the electrical utility's own purposes of protection and control of the transmission line, for the utility's own voice and data communication, or may be leased or sold to. OPAC (optical power attached cable) is a type of fiber optic cable that is installed by attaching to a host conductor along overhead power lines. OPAC cables can be installed on existing ground wires or phase conductors, even OPGW or OPCC to expand communications capacity. This technique takes a small, lightweight fiber optic cable and wraps it around or lashes it to the power line. The cable is called optical power attached cable (OPAC), and it is lashed to the power cable. All-dielectric self-supporting (ADSS) cable is a type of optical fiber cable that is strong enough to support itself between structures without using conductive metal elements.