Cisco Systems Cisco CRS-1 manual Installing a DC Power Shelf, Sequence of Tasks

Chapter 2 Installing and Removing Power Components

Installing a DC Power Shelf

Table 2-3	Resistance for Each Gauge of Copper Wire (continued)
Wire Gauge (AWG)		Ohms for Each 1000 Feet of Wire
11 AWG		1.257
12 AWG		1.5849
13 AWG		1.9987
14 AWG		2.5206
15 AWG		3.1778
16 AWG		4.0075
17 AWG		5.0526
18 AWG		6.3728
19 AWG		8.0351
20 AWG		10.1327
21 AWG		12.7782
22 AWG		16.1059

Installing a DC Power Shelf

This section describes how install a DC power shelf in the Cisco CRS-1 4-slot line card chassis. For installations in which AC power is currently installed, this section also describes how to convert your Cisco CRS-1 4-slot line card chassis from AC power to DC power.

The DC power shelf encloses four power supplies and the power distribution connections and wiring. The DC power input shelf is installed in the front of the chassis; the power input module (PIM) is installed in the rear of the chassis.

We recommend that you have two separate, redundant -48 VDC power battery sources to provide power to the Cisco CRS-1 4-slot line card chassis. Connect the two input pair 60-A DC inputs on the left to one -48 VDC power source, and the input pair 60-A DC inputs on the right to the other -48 VDC power source.

Sequence of Tasks

The sequence of tasks required to install the DC power shelf is as follows:

1.Remove the rear power access panels.

2.Install the DC power input module (PIM).

3.Install the DC power input shelf.

4.Mate and secure the power input module to the DC power input shelf.

5.Connect the grounding cable and the power input cables.

6.Install the DC power supplies.

	Cisco CRS-1 Carrier Routing System 4-Slot Line Card Chassis Installation Guide
OL-10971-07		2-11