Cisco Nexus 7004, Руководство по установке и справочное руководство по оборудованию

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2-9
Cisco Nexus 7000 Series Hardware Installation and Reference Guide
OL-23069-07
Chapter 2 Installing a Cisco Nexus 7004 Chassis
Grounding the Cisco Nexus 7004 Chassis
Grounding the Cisco Nexus 7004 Chassis
The Cisco Nexus 7004 switch is fully grounded as soon as you connect the chassis and the power
supplies to the earth ground in the following ways:
•
You connect the chassis to either a grounded and fully bonded rack or to the data center ground. This
ground connection is active even when the power supplies are not installed.
Note
The system ground, also referred to as the network equipment building system (NEBS) ground,
provides additional grounding for EMI shielding requirements and for the low-voltage supplies
(DC-DC converters) on the modules. This grounding system is active even when the AC power
cables are not connected to the system.
•
You connect the AC power supplies to the earth ground automatically when you connect an AC
power supply to an AC power source.
• You connect the DC power supplies to the earth ground before connecting the power supplies to the
DC power source (see the
“Connecting a DC Power Supply Directly to DC Power Sources” section
on page 6-10 ).
This section includes the following topics:
• Prerequisites for Grounding the Chassis, page 2-9
•
Connecting the System Ground, page 2-9
•
Connecting Your ESD Wrist Strap to the Chassis, page 2-11
Prerequisites for Grounding the Chassis
Before you can ground the chassis, you must have a connection to the earth ground for the data center
building. If you installed the Cisco Nexus 7004 chassis into a bonded rack (see the rack manufacturer’s
instructions for more information) that now has a connection to the data center earth ground, you can
ground the chassis by connecting its grounding port to the rack. Otherwise, you must connect the chassis
grounding port directly to the data center ground.
Connecting the System Ground
After you have moved the chassis into the rack or cabinet, you are ready to connect the system to the
data center earth ground. After you ground the chassis, you can ground your ESD wrist strap by
connecting it to the chassis.
To connect the system ground to the data center earth ground, follow these steps:
Step 1
Use a wire-stripping tool to remove approximately 0.75 inch (19 mm) of the covering from the end of
the grounding wire.
Step 2 Insert the stripped end of the grounding wire into the open end of the grounding lug as shown in
Figure 2-3 .