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somewhere on the front panel. We recommend that you use a personal ESD
grounding strap equipped with a banana plug.
v 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.
Note: This system ground is also referred to as the network equipment building
system (NEBS) ground.
v 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."
Note: 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.
Establishing the System Ground
This section describes how to connect a system ground to the SAN c-type switch.
Note: 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 IBM c-type SAN 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 IBM c-type SAN Device 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 IBM
c-type SAN Directors that are equipped with DC-input PEMs. The DC-input power
supplies for these chassis do not have a separate ground.
Connecting to the Ground System
About this task
To connect the ground system, you need the following tools and materials:
Chapter 3. Installing the IBM c-type SAN Device
73
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