Chapter 2 Chassis Power System; Power System Overview - Cisco CRS-1 System Description

Chassis Power System
This chapter describes the Cisco CRS Carrier Routing System 4-Slot Line Card Chassis power system.
The following sections are included:
•
•
•
Power specifications are provided in
Specifications."

Power System Overview

The Cisco CRS Carrier Routing System 4-Slot Line Card Chassis can be configured with either an
AC-input power subsystem or a DC-input power subsystem. Site power requirements differ depending
on the source voltage used. Follow these precautions and recommendations when planning power
connections to the router.
The Cisco CRS 4-slot line card chassis requires that at least the power shelves and their components be
installed to operate properly. Two types of power shelves exist: an AC shelf and a DC shelf. An AC
power shelf houses AC rectifiers, while a DC power shelf houses the DC power input module (PIM) and
DC power input shelf. We recommend that you use only one type of power shelf in a chassis at a time.
The AC power system is redundant and contains the following components:
•
•
•
•
The DC power system consists of the following components:
•
•
•
OL-10805-10
Power System Overview, page 2-1
AC Power System, page 2-2
DC Power System, page 2-7
One AC power shelf
Four AC rectifiers within the AC power shelf
Dual rectifier output buses, which provide redundant power inputs to chassis components
Special components, such as DC-to-DC converters, OR-ing diodes, and EMI filters
DC power input shelf (Cisco product number: CRS-4-DC-INPUT)
Power input module (PIM) (Cisco product number: CRS-4-DC-PIM)
DC power supplies (Cisco product number: CRS-4-DC-SUPPLY)
Cisco CRS Carrier Routing System 4-Slot Line Card Chassis System Description
C H A P T E R
Appendix A, "Cisco CRS 4-Slot Line Card Chassis System
2
2-1