Cisco Carrier Routing System CRS-1 Installation Manual page 32

Chapter 2 Installing and Removing Power Components
DC Power Systems on the Cisco CRS 4-Slot Router
Figure 2-8 DC Power Shelf: DC Power Input Shelf and DC Power Input Module (PIM)
Front orientation
2
1
Rear orientation
1 DC power input shelf 2 Power input module (PIM)
When installing the DC power shelf, these two components are mated to create the complete DC power
shelf (see the "Installing a DC Power Shelf" section on page 2-14 for details).
The Cisco CRS 4-slot line card chassis DC power system provides 4,000 watts to power the chassis. (To
provide power redundancy, up to 8,000 watts are available.) Each DC-powered chassis contains four DC
power supplies for 2N redundancy. The power input module (PIM) provides the input power
connections. Note that each power connection has two cables: –48 VDC and return. The power input
module (PIM), DC power input shelf, and the power supplies are field replaceable.
The Cisco CRS 4-slot line card chassis requires a total of four dedicated pairs of 60-A DC input power
connections, one pair for each of the power supplies, to provide redundant DC power to the Cisco CRS
4-slot line card chassis midplane.
For full 2N redundancy, we recommend that you have two independent –48 VDC power sources to
provide power to the Cisco CRS 4-slot line card chassis. Connect the two 60-A DC inputs on the left to
one wiring block, and the two 60-A DC inputs on the right to the other wiring block.
Cisco CRS Carrier Routing System 4-Slot Line Card Chassis Installation Guide
2-8
OL-10971-10