Cisco Systems MDS 9500 Series manual Establishing the System Ground, Required Tools and Equipment

Chapter 2 Installing the Cisco MDS 9500 Series

System Grounding

Se n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a ck - d o c @ c i s c o . c o m .

–Never attempt to remove the printed circuit board from the metal carrier.

Caution For safety reasons, check the resistance value of the antistatic strap periodically. The measurement should be between 1 and 10 megohm (Mohm).

Establishing the System Ground

This section describes how to connect a system ground to the MDS 9500 series switches.

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

You must use the system (NEBS) ground on both AC- and DC-powered systems if you are installing this equipment in a U.S. or European Central Office.

The system (NEBS) ground provides additional grounding for EMI shielding requirements and grounding for the low-voltage supplies (DC-DC converters) on the modules and is intended to satisfy the Telcordia Technologies NEBS requirements for supplemental bonding and grounding connections. You must observe the following system grounding guidelines for your chassis:

•You must install the system (NEBS) ground connection with any other rack or system power ground connections that you make. The system ground connection is required if this equipment is installed in a U.S. or European Central Office.

•You must connect both the system (NEBS) ground connection and the power supply ground connection to an earth ground. The system (NEBS) ground connection is required if this equipment is installed in a U.S. or European Central Office.

•For MDS 9500 series chassis that are equipped with DC-input power supplies, you must install the system (NEBS) ground before you attach the source DC power cables to the DC PEM. If the chassis is powered up, you must power down the chassis before attaching the system (NEBS) ground. If you are installing the system (NEBS) ground on models of the MDS 9500 series chassis that are equipped with either AC-input or DC-input power supplies, you do not need to power down the chassis.

Note The system (NEBS) ground serves as the primary safety ground for the MDS 9500 series chassis that are equipped with DC-input PEMs. The DC-input power supplies for these chassis do not have a separate ground.

Required Tools and Equipment

To connect the ground system, you need the following tools and materials:

•Grounding lug—A two-hole standard barrel lug. Supports up to 6 AWG wire. Supplied as part of accessory kit.

•Grounding screws—Two M4 x 8mm (metric) pan-head screws. Supplied as part of the accessory kit.

	Cisco MDS 9500 Series Hardware Installation Guide
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