Power Component Information Common To Two Types Of Power System; Basic Chassis Power Details; Power System-Modular Configuration; Precautions And Recommendations - Cisco CRS-1 System Description

Power Component Information Common to Two Types of Power System

Power Component Information Common to Two Types of Power System
This section contains information shared by the modular configuration power components in the following
topics:

Basic Chassis Power Details

The Cisco CRS 8-slot Line Card Chassis Enhanced router can be configured with either a DC-input power
system or an AC-input power system. The chassis power system provides the necessary power for chassis
components. Input power availability is site dependent and may be DC, AC Delta, or AC Wye.
A modular configuration AC power shelf houses up to 3 AC PMs, while a modular configuration DC power
shelf houses up to 4 DC PMs. It is required that you use only one type of power shelf in a chassis at a time.
Note
In a modular configuration power system, both AC and DC power supplies are referred to as power modules
(PMs).
Note
This unit might have more than one power module connection. All connections must be removed to de-energize
the unit. Statement 1028

Power System-Modular Configuration

Modular configuration power system consists of two power shelves and either AC or DC power modules
(PMs). However, the AC version of the modular configuration power system requires single-phase AC input
power to power the shelves. If you have 3-phase AC-Delta or AC-Wye at your equipment, a Cisco CRS PDU
will be required to convert 3-phase AC input power to single-phase AC input power for the power shelf. At
the shelf level, the power system provides 2N redundancy; the PMs themselves provide load-share redundancy.
Note In a modular configuration AC power system, PDU refers to the Cisco CRS PDU that 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.
Caution Use only one type of modular configuration power shelf—AC or DC—and its mating AC or DC PMs in a
chassis at one time.

Precautions and Recommendations

Follow these precautions and recommendations when planning power connections to the router:
• For the modular configuration power system, although power shelves may be installed or removed without
Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Enhanced Router System Description
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powering down the system, for safety purposes we recommend that you power down the system before
you install or remove a power shelf.
Cisco CRS 8-Slot Line Card Chassis Enhanced Router Power Systems