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Cisco CRS-1 Carrier Routing System 16-Slot Multishelf System Site Planning Guide
OL-7422-04
Chapter 2 16-Slot Fabric Card Chassis Installation Site Requirements
Fabric Card Chassis Power System Requirements
Fabric Card Chassis Power System Requirements
This section discusses FCC power requirements. The following sub-sections are included:
• Chassis Power System Overview, page 2-3
• General Power and Grounding Requirements, page 2-3
• DC Power Requirements, page 2-4
• AC Power Requirements, page 2-7
• AC Power Shelf Wiring, page 2-8
• Supplemental Bonding and Grounding, page 2-10
Chassis Power System Overview
Note The information in this section should be reviewed by qualified electricians before the installation of the
fabric card chassis. Be sure this information is reviewed far enough in advance of the installation so that
any changes to the site facilities can be made before the installation.
The fabric card chassis can be either DC or AC powered. The chassis power system provides power to
chassis components and is made up of two power shelves that contain power modules. Each power shelf
is connected to a separate and independent power source. Input power enters the power shelves and is
processed by the power modules before being distributed to the components in the chassis.
The power shelves and power modules are field replaceable. Each power shelf and power module has its
own circuit breaker.
Because each power module receives input power from a different power source, the power system
provides 2N power redundancy. During normal operation when both power sources are operational, both
sets of power shelves and power modules function together to power the chassis. However, if a power
sources fails, the other power source provides the other power shelf and power module with enough input
power to power the chassis. This 2N power redundancy enables the chassis to operate despite the power
failure.
Maximum input power requirements for the fabric card chassis are as follows:
• A DC-powered chassis requires 9000 watts (9 kW) of DC input power.
• An AC-powered chassis requires 11,100 watts (11.1 kW) of AC input power.
Note These power requirements are for a fully loaded chassis. However, it is a good idea to allocate this much
power for each chassis to ensure that enough power is available for future system expansion.
See Cisco CRS-1 Carrier Routing System Multishelf System Description for information about how each
power system operates and distributes power to components in the chassis.
General Power and Grounding Requirements
This section describes the power and grounding requirements you must consider when planning the site
facilities for the fabric card chassis. In addition, see the “DC Power Requirements” section on page 2-4
or the “AC Power Requirements” section on page 2-7 for additional power requirements.