Electrostatic Discharge - Cisco 4500 Series Installation Manual

Electrostatic Discharge

Warning
Note
Electrostatic Discharge
Catalyst 4500 Series Switches Installation Guide
2-2
If you will be using your switch as a PoE source, the following warning applies:
Voltages that present a shock hazard can exist on inline power circuits if
interconnections are made by using uninsulated exposed metal contacts,
conductors, or terminals. Avoid using such interconnection methods unless the
exposed metal parts are in a restricted access location and users and service
people who are authorized to access the location are made aware of the hazard.
A restricted access area can be accessed only through the use of a special tool,
lock and key, or other means of security. Statement 1072
This chapter describes how to prepare your site for the installation of the switch.
The information is presented in these sections:
Electrostatic Discharge, page 2-2
•
Site Power Requirements and Heat Dissipation, page 2-4
•
• Power Connection Guidelines for AC-Powered Systems, page 2-5
Site-Planning Checklist, page 2-16
•
See the Site-Planning Checklist
complete all site-planning activities before you install the switch.
Electrostatic discharge is common on Category 5E and Category 6 cabling
systems.
Category 5E and Category 6 cables have higher capacitance than Category 5
cables. As a result, Category 5E and Category 6 cables can store higher voltages
than Category 5 cables and are more prone to damaging networking equipment if
a differential discharge event occur.
Unshielded twisted-pair cables can store high voltages. When these charged
cables are connected to networking equipment, energy is discharged into the
networking equipment; this is known as electrostatic discharge (ESD).
Networking equipment is commonly designed and tested to withstand common
mode ESD events of up to 2000 V. The design for the common mode event is
based on the expectation that the discharge is delivered to all pins of a port at once.
Chapter 2
at the end of this chapter to help ensure that you
Preparing for Installation
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