The Cisco UBR-MC28C is a line card module designed for the Cisco uBR10012 Universal Broadband Router. It is used in cable networks to provide high-speed data, voice, and video services to subscribers. The UBR-MC28C supports DOCSIS 3.0 technology, allowing for faster data transfer rates and improved network performance. It has 28 downstream and 3 upstream channels, providing ample capacity for delivering broadband services to a large number of users. The module also includes advanced features such as channel bonding, IPv6 support, and QoS capabilities to ensure efficient and reliable service delivery.