Cisco XR 12816 Manuale di installazione

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Physical and Functional Description of Router

OL-17440-01

Product Overview

This chapter provides an overview of the Cisco XR 12416 and Cisco XR 12816

Router. It contains physical descriptions of the router hardware and major

components, as well as functional descriptions of the hardware-related features.

The Cisco XR 12416 and Cisco XR 12816 Router chassis is a sheet-metal

enclosure that houses router components. The major components consist of three

power supplies, upper and lower line card cages, a switch fabric card cage, and

upper and lower blower modules. Power is distributed to these components over

the chassis backplane.

All router models contain the following major components

Power shelf and power supplies—Three AC or DC power entry modules

•

(PEMs) provide power to the router. See the

section on page 1-4

Upper blower module—Supplies cooling air to the upper half of the router so

•

it does not overheat. See the

additional information.

Upper and lower cable management brackets—Used to neatly route line card

•

cables. See the

"Upper and Lower Cable Management Brackets" section on

page 1-36

for additional information.

Cisco XR 12416 and Cisco XR 12816 Router Chassis Installation Guide

C H A P T E R

for additional information.

"Blower Module" section on page 1-36

(Figure

1-1):

"AC and DC Power Subsystems"

for

1-1