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CHAPTER
2-1
Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Installation Guide
OL-6256-17
2
Installing and Removing Power Components
This chapter provides instructions on how to install and remove Cisco CRS Carrier Routing System
8-slot line card chassis power components.
Power Systems Overview
There are two options for power systems: the fixed configuration power system and the modular
configuration power system. Power components are not interchangeable between the fixed and modular
configuration power system.
• Fixed configuration power system consists of two power distribution units (PDUs) and either DC
power entry modules (PEMs) or AC rectifiers. The AC version requires 3-phase AC-Delta or
AC-Wye input power to the PDU. The PDU distributes facility power to the AC rectifier or DC PEM,
which in turn provides processed power to the chassis. A removable air filter is located on the front
of each DC PEM and AC rectifier. The fixed configuration power system includes SNMP MIBS and
XML support.
• Modular configuration power system consists of two power shelves and either AC or DC power
modules (PMs). However, unlike the fixed configuration power system, 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. The modular configuration power system also includes SNMP MIBs and XML support.
Note In a fixed configuration AC or DC power system, PDU refers to the power component that connects to
the AC rectifier or DC PEM.
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.