The Cisco uBR10-MC5X20S cable interface line card is designed specifically for the Cisco uBR10012 router. This card transmits and receives RF signals between the subscriber and the headend over hybrid fiber/coax (HFC) system.The Cisco uBR10-MC5X20S cable interface line card supports downstream and upstream traffic over a Data-Over-Cable Service Interface Specification (DOCSIS)-based cable modem network. 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 88 to 860 MHz range, and upstream channels in the 5 to 42 MHz range.Upstream data from the subscriber, comes through the upstream ports (US0- US19) on the Cisco uBR10-MC5X20 cable interface line card. The line card processes and configures the data and sends it across the backplane to the WAN/backhaul card and out to the Internet.Downstream data to the subscriber, comes from the Internet through the WAN/backhaul card, and across the backplane to the Cisco uBR10-MC5X20S cable interface line card. The Cisco uBR10-MC5X20S card processes and configures the data and sends it out through the appropriate downstream port (DS0 - DS4) to be combined with the rest of the downstream signals in the headend. Each downstream port includes an inboard-integrated upconverter.The Cisco uBR10-MC5X20S cable interface line card supports all DOCSIS 1.1-specified Annex B radio frequency (RF) data rates, channel widths, and modulation schemes and has DOCSIS MAC management and spectrum management capabilities.