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Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide
OL-5421-03
Chapter 1 Cisco uBR7200 Series Overview
Hardware Component Descriptions
Figure 1-13
Cisco uBR7246 and Cisco uBR7246VXR Chassis
Note
To replace the Cisco uBR7200 series chassis, you must remove all of its internal components; therefore,
when replacing the chassis, refer to the documents that explain how to remove and replace the internal
components on Cisco.com.
Subchassis and Midplane
The subchassis and midplane provide these functions for the Cisco uBR7200 series:
•
Distributes power from the power supply to the I/O controller.
•
Bridges the peripheral component interconnect (PCI) buses from the port adapters to the packet
static random-access memory (SRAM) on the NPE-200 or synchronous dynamic random-access
memory (SDRAM) on the NPE-400, Cisco uBR7200-NPE-G1, or the Cisco uBR7200-NPE-G2.
•
Arbitrates traffic across the PCI buses.
•
Generates clock signals for the port adapter on the PCI bus.
Cisco uBR7246VXR and Cisco uBR7246 Subchassis
The Cisco uBR7246VXR and Cisco uBR7246 subchassis (the rear of the routers) have two bays for
power supplies and one slot for a network processing engine. (See
Figure 1-14
.)
The cable-interface card side of the Cisco uBR7246VXR and Cisco uBR7246 midplane has four
connectors for cable interface cards, two connectors for port adapters, one connector for an
I/O controller, and a connector for the fan tray.
The Cisco uBR7246VXR also features one connector for a cable clock card. The power supply side of
the midplane has two connectors for power supplies and one connector for a network processing engine.
The midplane supplies DC power to the router’s internal components.
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Port adapter slots
I/O controller
slot
Subchassis and midplane bay
(at rear)
Cable interface
card slots
Fan tray
