Cisco Cisco uBR-MC3Gx60V-RPHY Broadband Processing Engine インストールガイド

The Cisco uBR10-MC5X20S, U and H cable interface line cards are 20 by 16 inch cards designed 
specifically for the Cisco uBR10012 router. These cards transmit and receive RF signals between the 
subscriber and the headend over hybrid fiber-coaxial (HFC) system. 

Upstream data, from the subscriber, comes through the upstream ports (US0–US19) on the 
Cisco uBR10-MC5X20S/U/H 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/U/H cable interface line card. The 
Cisco uBR10-MC5X20S/U/H 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. 

The Cisco uBR10-MC5X20S/U line cards use burst receivers that report unequalized Modulation Error 
Ratio (MER). The Cisco uBR10-MC5X20H line cards (as well as the MC16C, MC28C, and MC28U line 
cards for the Cisco uBR7246VXR) use burst receivers that report equalized MER. Equalized MER will 
almost always be at least a few decibels (dB) higher than an unequalized MER measurement of the same 
signal under identical conditions. This is normal. Many of our customers see a 2 to 4 dB difference 
between the equalized MER reported by the MC5X20H, and the unequalized MER reported by the 
MC5X20S/U on the same upstream. But, if significant channel response impairments are present, the 
difference between equalized and unequalized MER can be substantially greater (10 dB or more in some 
cases). This, too, is normal. For more comprehensive information, see 

The Cisco uBR10-MC5X20S cable interface line card supports downstream and upstream traffic over 
Data-over-Cable Service Interface Specification (DOCSIS)-based cable modem networks. The card 
supports downstream channels in the 70 to 860 MHz range, and upstream channels in the 5 to 42 MHz 
range. Each downstream port includes an onboard integrated upconverter. The Cisco uBR10-MC5X20S 
cable interface line card supports Annex B radio frequency (RF) data rates, channel widths, and 
modulation schemes and has DOCSIS MAC management and spectrum management capabilities. 
DOCSIS 2.0, Asynchronous Time Division Multiple Access (A-TDMA) rates are also supported.

The Cisco uBR10-MC5X20U/H cable interface line card supports both DOCSIS and EuroDOCSIS cable 
modem networks. The card supports downstream channels in the 70 to 860 MHz range, and upstream 
channels in the 5 to 65 MHz range. Each downstream port includes an onboard integrated upconverter. 
The Cisco uBR10-MC5X20U/H cable interface line card supports Annex B and Annex A radio 
frequency (RF) data rates, channel widths, and modulation schemes and has DOCSIS MAC management 
and spectrum management capabilities. DOCSIS 2.0, A-TDMA rates are also supported.

The Cisco uBR10-MC5X20H has double the line card CPU speed, memory, and flash memory as the 
Cisco uBR10-MC5X20U, allowing support of Voice over IP (VoIP) at much higher call loads and a 
higher percentage of modems running advanced DOCSIS features that typically consume line card CPU 
resources.