Cisco WCM300 - Channel Bonded Cable Modem Implementation Manual page 22

Chapter 2 Cisco Cable Wideband Components
Base CMTS Components
For a DOCSIS 1.X/2.0 system, downstream data to the subscriber, comes from the Internet through the
WAN/backhaul card, and across the backplane to the cable interface line card. The cable interface 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.
For Cisco Cable Wideband Solution, Release 1.0 bonded channel operation, the cable interface line cards
are used for upstream return traffic and signalling, for downstream MAC management and signaling
traffic, and for DOCSIS 3.0 Downstream Channel Bonding operations. With wideband, the use of the
cable interface line card's downstream channel is different than for a DOCSIS 1.X/2.0 system. The
wideband channel's downstream data traffic uses the Cisco Wideband SPA and an external edge QAM
device. See Chapter 3, "Cisco Cable Wideband Architecture" for more information on Cisco Cable
Wideband systems.
Cisco uBR10-MC5X20S
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.
Cisco uBR10-MC5X20U and H
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.
Compared to the Cisco uBR10-MC5X20U, the uBR10-MC5X20H increases the line card CPU speed,
memory, and flash, 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.
Cisco uBR10-MC5X20U-D
The Cisco uBR10-MC5X20U-D cable interface line card supports both DOCSIS and EuroDOCSIS cable
modem networks. The Cisco uBR10-MC5X20U-D cable interface line card supports Annex A and
Annex B radio frequency (RF) data rates, channel widths, and modulation schemes and has DOCSIS
MAC management and spectrum management capabilities.
Table 2-2 shows the supported DOCSIS modulation schemes.
Cisco Cable Wideband Solution Design and Implementation Guide, Release 1.0
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