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Cisco Network Convergence System 6000 Series Routers Site Planning Guide
OL-29236-02
Chapter 2 Power and Cooling
AC Power Systems
Figure 2-16 shows the AC input power cables plugged into the AC power trays.
Figure 2-16 AC Power Tray Power Cable Connections
Converting 3-Phase AC to Single-Phase AC
If you have 3-phase AC Delta or AC Wye input power at your equipment, a Cisco NCS 3-phase AC PDU
is required to convert 3-phase AC Delta or AC Wye input power to single-phase AC input power that
connects directly to the rear of each PM. The Cisco NCS PDU includes either an AC Delta or AC Wye
power interface, and has power input and power output cords entering and exiting the box. An optional
mounting bracket is available for mounting the PDUs on both sides of the chassis. Note that the width
required is 35.3 in. (89.7 cm) with optional AC PDU brackets on each side of the chassis.
For more information on AC PDUs, refer to the Cisco CRS 3-Phase AC Power Distribution Unit
Installation Guide on Cisco.com.
In addition to the requirements in the “General Power and Grounding Requirements” section on
page 2-1, AC input power requirements are as follows:
• Two separate and independent AC power sources are required to provide N+N power redundancy.
One, two, or three 3-phase feeds may be used from that source according to how many PMs are being
powered; one feed for one PDU, which feeds up to three PMs. The first three power trays would be
fed from the first AC power source (via the AC PDUs), and the other three power trays would be fed
from the other AC power source (via the other AC PDUs).
• Each 3-phase AC power source must provide its own circuit breakers.
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