General Power And Grounding Requirements - Cisco CRS-1 Site Planning Manual

General Power and Grounding Requirements

In a fixed configuration AC or DC power system, PDU refers to the power component that connects to
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the AC rectifier or DC PEM.
In a modular configuration AC power system, PDU refers to the Cisco CRS 3-phase AC PDU that
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converts 3-phase AC-Wye or AC-Delta input power to single-phase AC input power for the modular
configuration AC power shelf. For further information, refer to Cisco CRS 3-Phase AC Power
Distribution Unit Installation Guide.
Fixed configuration chassis input power requirements are as follows:
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Modular configuration chassis input power requirements are as follows:
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If you have a Cisco CRS 3-phase AC PDU installed, three AC PMs are required to be installed in each
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modular configuration AC power shelf to maintain a balanced 3-phase power load.
These power requirements are for a fully loaded chassis with eight PLIMs. A chassis with six or
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seven PLIMs uses slightly less power. 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 Carrier Routing System 8-Slot Line Card Chassis System Description for detailed
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 routing system. In addition, see the
Power Systems" section on page 2-11
chassis type.
A qualified electrician should review the information in these sections to ensure that the installation site
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meets these requirements. For larger system configurations, consult a facilities electrical expert to
understand the load that the routing system may put on the facility power plant.
Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide
2-2
DC-powered chassis requires up to a maximum of 8,000 watts (8.0 kW) of DC input power when
the chassis is fully loaded.
AC-powered chassis requires up to a maximum of 8,500 watts (8.5 kW) of AC input power when
the chassis is fully loaded.
DC-powered chassis requires up to a maximum of 9,500 watts (9.5 kW) of DC input power when
the chassis is fully loaded.
AC-powered chassis requires up to a maximum of 9,800 watts (9.8 kW) of AC input power when
the chassis is fully loaded.
"DC Power Systems" section on page 2-5
for additional information about the power requirements for your
Chapter 2 Power and Cooling
or the "AC
OL-5802-09