Installation guide

2-27
Cisco IGX 8400 Series Installation Guide, Release 9.3.3 and Later Releases
OL-1165-06
Chapter 2 Preparing to Install
IGX 8420 or IGX 8430 Enclosure Installation
• Mounting brackets and screws
• Air inlet bezel
Power supply installation or replacement requires the following tools:
• Flat-blade screwdriver set
• Phillips screwdriver set
Understanding the AC Power Supply Configuration
Tip To develop the most accurate IGX power budget, use Table 2-1 on page 2-1 and Table 2-2 on page 2-2,
or the interactive power worksheets. If you decide to use the general guidelines mentioned in this section
during network planning stages, confirm your results by using the power worksheets before bringing the
node live in an operational environment.
The setup for power supplies depends on the number of AC power inputs, the IGX model, and the
number of cards in the system. The minimum configuration is one AC source and one supply. This
minimum number applies to the IGX 8420 node with 12 or fewer cards. Figure 2-11 illustrates the
alphanumeric slot designations in a full tray.
Figure 2-11 Power Supply Slot Designations
Redundancy
Two types of redundancy exist in the AC power supply configuration. One redundancy is that of AC
power inputs. A redundant AC power source from a building circuit that is separate from the other AC
circuit provides backup if one AC circuit at the site fails. The other redundancy is that of the 875 W
power supply modules. Redundancy of the 875 W supplies provides a backup if one supply fails.
In supporting the two types of redundancy, power supply arrangements differ, as follows:
• When a system uses two AC inputs, the number of supplies on the left and right sides must match.
For example, if a system with dual AC inputs has four supplies, the supplies must occupy slots A,
B, D, and E.
• When a system uses one AC source, the number of supplies on the left and right sides can differ.
For example, three supplies on the left and one on the right is permissible.
ABCDEF
Back of cabinet
View from
above
Front of cabinet
H8339