C H A P T E R 2
Power and Cooling
This chapter describes the Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis power and cooling systems. It also provides the power and grounding and cooling requirements for the installation site to help you plan the site facilities for the system. The Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis System Description provides detailed information about these components.
This chapter contains the following sections:
•General Power and Grounding Requirements
•AC Power Requirements
•Chassis Airflow
Chassis Power System
The 8-slot line card chassis can be either DC or AC powered. Each type of power system (DC or AC) provides power to chassis components. The chassis power system is made up of two input power distribution units (PDUs) and two power modules, one in each PDU. Each PDU is connected to a different power source. Input power enters the PDU and is passed to the power module, which provides 7,500 watts of power to the components in the chassis. Each power module has its own circuit breaker.
The Cisco CRS-1 8-slot line card chassis uses the AC power PDUs to provide the two types of AC wiring schemes (Wye and Delta). Each chassis has two PDUs, and each PDU takes one supply which, in the case of AC, has three internal zones such that two three-zone power supplies provide three redundant power zones (see the Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis System Description for more information).
Because each PDU is connected to a separate and independent power source, the power system provides 2N power redundancy. During normal operation when both power sources are operational, both sets of PDUs and power modules function together to power the chassis. However, if a power sources fails, the other power source provides the other PDU and power module with enough input power to power the chassis. This 2N power redundancy enables the routing system to operate despite the power failure.
Chassis input power requirements are as follows:
•A DC-powered chassis requires 8,000 watts of DC input power.
Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide
