Cisco MDS 9700 Series User Manual

This system ground is also referred to as the network equipment building system
(NEBS) ground.
Note
• If your chassis does not have the system ground attached, you must install the system ground lug. For
installation instructions and location of the chassis system ground pads, see “Establishing the System
Ground” section.
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.
Note
Establishing the System Ground
This section describes how to connect a system ground to the MDS 9700 Series switch.
This system ground is also referred to as the network equipment building system (NEBS) ground.
Note
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 Cisco MDS 9700 Series devices 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 Cisco MDS 9700 chassis that are equipped with
either AC-input or DC-input power supplies, you do not need to power down the chassis.
The system (NEBS) ground serves as the primary safety ground for the MDS
9700 Series switch that are equipped with DC-input PEMs. The DC-input power
supplies for these chassis do not have a separate ground.
Note
Cisco MDS 9700 Series Switches Hardware Installation Guide
101
Installing the Cisco MDS 9700 Series Switches
Establishing the System Ground

Cisco MDS 9700 Series Specifications

General

Brand	Cisco
Model	MDS 9700 Series
Category	Switch
Language	English