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Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Installation Guide
OL-6256-17
Chapter 2 Installing and Removing Power Components
Power Component Information Common to Two Types of Power System
Fixed Configuration Power System
Three types of PDUs exist for fixed configuration power system:
• AC Wye PDU
• AC Delta PDU
• DC PDU
The AC PDU connects to the AC rectifier, while the DC PDU connects to the DC PEM. Although there
are differences among the different PDU types (AC Wye, AC Delta, and DC), they are installed in the
same manner. For detailed information, see the “How to Install or Remove Fixed Configuration Power
Components” section on page 2-13.
Note The fixed configuration PDUs arrive preassembled in the chassis. AC power cords arrive preattached but
the DC power cables need to be installed.
Caution Use only one type of fixed configuration PDU—AC Wye, AC Delta, or DC—and its mating AC rectifier
or DC PEM in a chassis at one time.
Modular Configuration Power System
The modular configuration AC power shelves connect to AC PMs, while the modular configuration DC
power shelves connect to DC PMs. Although there are differences between the two different power shelf
types (AC and DC), they are installed in the same manner. Similarly, the modular configuration AC and
DC PMs are installed in the same manner. For detailed information, see the “How to Install or Remove
Modular Configuration Power Components” section on page 2-25.
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:
• Check the power at your site before installation and periodically after installation to ensure that you
are receiving clean power. Install a power conditioner, if necessary.
• Properly ground your system to avoid damage from lightning and power surges.
Note For the fixed configuration power system, although PDUs may be installed or removed without powering
down the system, for safety purposes we recommend that you power down the system before you install
or remove a PDU.
For the modular configuration power system, although power shelves may be installed or removed
without powering down the system, for safety purposes we recommend that you power down the system
before you install or remove a power shelf.