Cisco Systems N5KC5548UPFA User Manual

Always ensure that all of the modules are completely installed and that the captive installation screws 
are fully tightened. In addition, ensure that all I/O cables and power cords are properly seated. These 
practices are normal installation practices and must be followed in all installations. 

Electrostatic discharge (ESD) damage, which can occur when modules or other FRUs are improperly 
handled, results in intermittent or complete failures. Modules consist of printed circuit boards that are 
fixed in metal carriers. Electromagnetic interference (EMI) shielding and connectors are integral 
components of the carrier. Although the metal carrier helps to protect the board from ESD, always use 
an ESD grounding strap when handling modules. 

For preventing ESD damage, follow these guidelines: 

Always use an ESD wrist strap and ensure that it makes maximum contact with bare skin. 

ESD grounding straps are available with banana plugs, metal spring clips, or alligator clips. All 
chassis from the Cisco Nexus 5500 Platform or from the Cisco Nexus 5000 Platform switches are 
equipped with a banana plug connector (identified by the ground symbol next to the connector) 
somewhere on the front panel. We recommend that you use a personal ESD grounding strap 
equipped with a banana plug. 

If you choose to use the disposable ESD wrist strap supplied with most FRUs or an ESD wrist strap 
equipped with an alligator clip, you must attach the system ground lug to the chassis in order to 
provide a proper grounding point for the ESD wrist strap. 

This system ground is also referred to as the network equipment building system (NEBS) ground.

If your chassis does not have the system ground attached, you must install the system ground lug. 
See the 

 for installation instructions and 

location of the chassis system ground pads.

You do not need to attach a supplemental system ground wire to the system ground lug; the lug provides 
a direct path to the bare metal of the chassis

. 

After you install the system ground lug, follow these steps to correctly attach the ESD wrist strap:

Attach the ESD wrist strap to bare skin as follows:

If you are using the ESD wrist strap supplied with the FRUs, open the wrist strap package and 
unwrap the ESD wrist strap. Place the black conductive loop over your wrist and tighten the strap 
so that it makes good contact with your bare skin.

If you are using an ESD wrist strap equipped with an alligator clip, open the package and remove 
the ESD wrist strap. Locate the end of the wrist strap that attaches to your body and secure it to your 
bare skin. 

Grasp the spring or alligator clip on the ESD wrist strap and momentarily touch the clip to a bare metal 
spot (unpainted surface) on the rack. We recommend that you touch the clip to an unpainted rack rail so 
that any built-up static charge is then safely dissipated to the entire rack.