Cisco SCE 2000, Руководство по установке и настройке

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4-14
Cisco SCE 2000 4xGBE Installation and Configuration Guide
OL-7824-07
Chapter 4 Installation and Maintenance
Removing and Replacing a Power Supply Unit
Information About the Power Supply
The SCE 2000 is available in two power options:
•
Dual line feed AC power — SCE 2000 is shipped with two appropriate AC power supply cords.
• Dual line feed DC power — requires appropriate cables (hex or loop connectors) (see How to
Reconnect DC-Input Power Supply Unit, page 4-19 ).
The dual power supply units supply hot-swappable, redundant power. Redundant power is useful as a
failover; if a situation occurs where one power supply is down (for instance, a power supply fails or a
new power supply needs to be installed), the SCE 2000 can continue to run properly using the other
power supply.
Each power supply has fans that cool the power supply unit. These fans also help to cool the internal
components of the SCE 2000, as they direct the air flow to the outside through vents in the rear of the
power supply unit.
The faceplates of both power supplies have a handle, an on/off switch, and one captive installation screw.
An AC-input power receptacle is available on the AC-input power supply and a DC-input terminal block
is available on the DC-input power supply.
Note that the power supply units are asymmetrical, with a screw in only one corner of the unit. Therefore,
both power supply units can be fastened only if both units are inserted in the proper orientation. This
also prevents the accidental installation of one DC unit and one AC unit. (Refer to
Figure 4-13 or
Figure 4-14 ).
Figure 4-13 AC Unit Faceplate
Figure 4-14 DC Unit Faceplate
92767
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Input
48/60Vdc
7A
ON
OFF
-48V
-48VRTN
92774
1 2 3 4 5