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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 AC Power
An AC-powered Cisco CRS 8-slot line card chassis contains two AC power distribution units (PDUs)
and two AC rectifier modules. Each AC PDU is connected to a 3-phase (200 to 240) input VAC power
source and connects to a single 7500-watt AC rectifier module that is field replaceable. Each AC rectifier
module converts input AC power to the 54.5 VDC used by the Cisco CRS 8-slot line card chassis. Each
rectifier has its own circuit breaker.
To provide 2N power redundancy for the Cisco CRS 8-slot line card chassis, each PDU and AC rectifier
pair is connected to a different AC power source. During normal operation when both power sources are
operational, both PDUs and rectifiers function together to power the chassis. However, if a power source
fails, the other power source provides the other PDU and rectifier pair with enough input power to power
the chassis. This 2N power redundancy enables the routing system to operate despite the power failure.
Two versions of the AC PDU are available to accommodate AC input power in either the Delta or Wye
configuration. Each PDU has a different Cisco part number. The PDUs are shipped with AC power cords
that are 14 feet (4.3 m) long.
Unlike the Cisco CRS 16-slot line card chassis, the Cisco CRS 8-slot line card chassis does not contain
an alarm module. A microprocessor in the AC rectifier monitors the status of each AC rectifier. The
microprocessor communicates with the system controller on the RP card. LEDs on the front panel of the
RP card indicate active alarm conditions.
The AC PDUs have the following input VAC power requirements:
• AC Wye input: 3-phase, 200 to 240 VAC nominal (phase-to-neutral), 50 to 60 Hz,
16 A (International) or 20 A (North America). The PDU is rated for 14-amp service, and accepts AC
input of 16 or 20 A.
The Wye power cord has a 5-pin IEC 60309 plug that is rated for 400 VAC, 16 or 20 A, (3W + N +
PE). The power cord plugs into a similarly rated IEC 60309 receptacle.
• AC Delta input: 3-phase, 200 to 240 VAC nominal (phase-to-phase), 50 to 60 Hz, 30 A. The PDU is
rated for 24-amp service, and accepts AC input of 30 A.
The Delta power cord has a 4-pin NEMA L15-30P plug that is rated for 250 VAC, 30 A (3W + PE).
The power cord plugs into a similarly rated NEMA L15-30R locking-type receptacle.
For additional power details, see Appendix A, “Cisco CRS Carrier Routing System 8-Slot Line Card
Chassis Specifications” or Cisco CRS Carrier Routing System 8-Slot Line Card Chassis System
Description.
Modular Configuration AC Power
The Cisco CRS 8-slot line card chassis modular configuration AC power system can provide up to
9,000 W to power the line card chassis.
Note Depending on the hardware deployed at your site, your system may not consume the maximum power
supplied by the power system.
The modular configuration power system provides the following features:
• AC power shelf redundancy
• PM load-share redundancy
• Elimination of power zone distribution, while maintaining zone protection
• Capacity for future growth