A USB to RJ45 console cable (often called a rollover cable) allows IT professionals to connect a computer’s USB port directly to the RJ45 console port of routers, switches, and firewalls for configuration. It acts as a bridge, replacing old RS232 (DB9) serial cables by eliminating the need for a separate adapter, often using an internal FTDI chip for stability and broad compatibility with devices from Cisco, Ubiquiti, Juniper, and more.