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Cisco XR 12416 Router Installation Guide
OL-13833-01

CHAPT ER

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Product Overview
This chapter provides an overview of the Cisco XR 12416 router. It contains
physical descriptions of the router hardware and major components, as well as
functional descriptions of the hardware-related features.

Physical and Functional Description of Router

The Cisco XR 12416 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 (Figure1-1):
•Power shelf and power supplies—Three AC or DC power entry modules
(PEMs) provide power to the router. See the “AC and DC Power Subsystems”
section on page 1-4 for additional information.
•Upper blower module—Supplies cooling air to the upper half of the router so
it does not overheat. See the “Blower Module” section on page1-30 for
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 1-30 for additional information.