Cisco CRS-1 - Manual (Page 21)

C H A P T E R
2-1
Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide
OL-5802-09
2
Power and Cooling
This chapter describes the Cisco CRS Carrier Routing System 8-Slot LCC power and cooling systems.
It also provides the power, grounding, and cooling requirements for the installation site to help you plan
the site facilities for the system. Cisco CRS Carrier Routing System 8-Slot Line Card Chassis System
Description provides detailed information about these components.
This chapter contains the following sections:
• Chassis Power System, page 2-1
• General Power and Grounding Requirements, page 2-2
• Bonding and Grounding Guidelines, page 2-3
• DC Power Systems, page 2-5
• AC Power Systems, page 2-11
• Chassis Airflow, page 2-19
• Facility Cooling Requirements, page 2-20
Chassis Power System
The 8-slot LCC can be either DC or AC powered. Each type of power system (DC or AC) provides power
to chassis components. There are two options for power systems: the fixed configuration power system
and the 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 3-Phase AC 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.