Universal Broadband Router Hardware Installation Guide

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Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
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Chapter 1 Cisco uBR10012 Universal Broadband Router Overview
Comparisons with Other Cisco CMTS Platforms
– Multiple fans in the fan assembly provide redundancy to support single failure.
– Status LEDs on the fan assembly indicate single or multiple fan failure.
– Replacing the fan assembly module does not interrupt service (within certain time limits).
Comparisons with Other Cisco CMTS Platforms
The Cisco uBR10012 router is a next-generation CMTS platform with the following significant
differences from the other Cisco CMTS platforms (Cisco
uBR7100 series and Cisco uBR7200 series
universal broadband routers):
• The Cisco uBR10012 router supports a larger form factor for cable interface line cards. The existing
cable interface line cards for the Cisco
uBR7200 series routers cannot be used with the
Cisco
uBR10012 router, except for the Cisco uBR-MC28C, which must be installed in the
Cisco
line card processor adapter card (Cisco uBR10-LCP2) before it can be installed in the
Cisco
uBR10012 router.
• The Cisco uBR10012 router uses high-performance PRE modules as its processor cards. It does not
use any of the network processor cards used on the Cisco
uBR7200 series router.
• The Cisco uBR10012 router is a high-performance, high-throughput CMTS router that requires
high-performance network uplink line cards for its WAN connectivity to the Internet and other
connected networks. It does not use any of the port adapters that are available for the Cisco
uBR7100
series and Cisco
uBR7200 series router.
• The Cisco uBR10012 router does not use the Cisco cable clock card because the TCC+ cards include
national clock support.
• To accommodate the new architecture of the Cisco uBR10012 chassis, slot numbering on the router
has been expanded to include a card and subcard numbering system (1/0, 2/0, and so forth). See
Figure 1-4 for a diagram of the slot numbering on the Cisco uBR10012 chassis.
Cisco uBR10012 Router Functional Overview
The Cisco uBR10012 router is a cable modem termination system (CMTS) that provides Internet, LAN,
and WAN access for cable modems and set-top-boxes (STBs) over a coaxial cable connection. The router
enables high-speed data services to be packaged like they are in basic cable television service or video
programming.
The path from the CMTS to the cable modem or STB is the downstream, which carries the majority of
traffic over the cable interface. The path from the cable modem or STB to the CMTS is the upstream,
and it typically carries approximately 10 percent of the traffic that is sent over the downstream. A large
number of users can be assigned to the same downstream, and for efficient use of bandwidth, those users
can be split among several different upstreams.
For example, users who are connecting to the Cisco uBR10012 router through the
Cisco
uBR10-LCP2-MC28C cable interface line card are typically divided between the two separate
downstreams. Each group of users is then divided between the four separate upstreams.
The following sections provide a high-level overview of the data path over the upstream and the
downstream.