The Campus-RS RS-449 Interface Card (CARS-449) provides a connection between an HDSL line and a network or other digital equipment. It installs into either a Campus-RS Star chassis, along with a Campus-RS Line Unit, or a Campus-RS Desktop Unit. This comprises half of an HDSL transmission system. When connected to another Campus-RS Desktop Unit or Line Unit, the Campus-RS system can transport digitized voice, data and video signals over existing copper wire at a number of different HDSL rates. The CARS-449 converts incoming data, control signals and timing information into RS-449 format. The desktop unit or line unit then converts this format to a 2B1Q HDSL line format for high-speed transmission over a local telephone-grade copper network.