The Cisco uBR-MC28C and Cisco uBR-MC28C-BNC line cards offer a total of two downstream and eight upstream ports. The cards deliver the capacity and performance needed to meet increased subscriber demands, without requiring purchase of a new system. The cards offer the choice of connectors in a dual 1x4 downstream-to-upstream port ratio. The cards can be housed in a Cisco uBR7246VXR or Cisco uBR7223. Deploying cable Internet Protocol (IP) data and voice services means cable operators must be able to scale network bandwidth and support large numbers of subscribers efficiently and cost-effectively. The Cisco uBR-MC28C and Cisco uBR-MC28C-BNC Data-over-Cable Service Interface Specifications (DOCSIS) line cards meet these requirements. The products offer the highest port density available for Cisco uBR7200 Series line cards and give service providers the choice of coaxial BNC or F-type connectors.Offering a total of two downstream and eight upstream ports, the cards significantly increase the number of subscribers a Cisco uBR7246VXR or Cisco uBR7223 support. This postpones or eliminates the need to purchase additional chassis to meet increased demands and saves rack space at the head end or distribution hub. Both the Cisco uBR-MC28C and the Cisco uBR-MC28C-BNC cards support 6 MHz National Television Systems Committee (NTSC) channel operation using standard (STD), Harmonic Related Carrier (HRC), or Incremental Related Carrier (IRC) frequency plans. The cards can be used in 8 MHz international cable plants, but in these instances, ignore 2 MHz of available downstream channel width and handle upstream ranges up to 42 MHz. The Cisco uBR-MC28C and Cisco uBR-MC28C-BNC line cards are divided into two radio frequency (RF) domains; each with one downstream and four upstream ports. Upstream ports are fixed to a specific downstream. Both domains operate independently of each other.