The Cisco uBR-MC28C cable modem card resides in a Cisco uBR7200 series universal broadband router and supports downstream and upstream traffic to and from Data-Over-Cable Service Interface Specification (DOCSIS)-based cable modems (CMs). The card supports 6-MHz National Television Systems Committee (NTSC) channel operation, using standard (STD), Harmonic Related Carrier (HRC), or Incremental Related Carrier (IRC) frequency plans conforming to EIA-S542. The card supports downstream channels in the 54-to-860 MHz range, therefore, with upstream ranges of 5 to 42 MHz.The Cisco uBR-MC28C cable modem card: Expands the capacity of a Cisco uBR7200 series universal broadband router, providing the highest port density in Cisco cable modem cards available today, the card offers another downstream channel and additional upstream channels; Gives cable operators additional flexibility in partitioning the cable plant to address growing subscriber bandwidth demands; enables cost-effective scalability of services and subscribers; Offers advanced functionality, supporting DOCSIS 1.0 and DOCSIS 1.0 extensions, as well as other Cisco IOS Release 12.1(3a)EC1 features such as Hot Standby 1+1 Redundancy and Dynamic Upstream Modulation; Supports all earlier Cisco cable modem card features including: Online insertion and removal (OIR), allowing key system components to be added or removed without powering off the chassis, and Downloadable software, allowing new Cisco IOS images to be remotely loaded. It also interoperates with DOCSIS-compliant cable modems and other RF customer premises equipment (CPE) devices, including the Cisco uBR910 series cable data service units (DSUs), the Cisco uBR924, and the Cisco uBR904.