While both ADSS and OPGW (Optical Ground Wire) cables are used on power lines, they serve different purposes. ADSS is a standalone communication cable that can be installed on existing or new power line poles. OPGW is a dual-purpose cable that functions as a traditional overhead ground wire for lightning protection and also contains optical fibers for communication. OPGW is typically installed at the top of a transmission tower, replacing the ground wire. The choice between ADSS and OPGW depends on the specific project requirements, existing infrastructure, and budget.