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interference (EMI) shielding and connectors are integral components of the carrier. Although the metal
carrier helps protect the board from ESD. Always wear an ESD grounding strap when handling modules.
Follow these guidelines for preventing ESD damage:
• Always wear 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 IBM c-type
SAN devices 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.
Note : 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. For
installation instructions and location of the chassis system ground pads, see "Establishing the System
Ground" on page 77.
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:
• Grounding lug-A two-hole standard barrel lug. Supports up to 6 AWG wire. Supplied as part of accessory
kit.
Chapter 3. Installing the IBM c-type SAN Device 77
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