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Chapter 2 Preparing for Installation
Electrostatic Discharge
2-2
Catalyst 4500 Series Switches Installation Guide
78-14409-08
If you will be using your switch as a PoE source, the following warning applies:
Warning
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 whoare authorizedto accessthe locationare madeaware ofthehazard.
A restrictedaccess area canbe accessed onlythrough the useof aspecial 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
Note See the Site-Planning Checklist at the end of this chapter to help ensure that you
complete all site-planning activities before you install the switch.
Electrostatic Discharge
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 toall pins of a port at once.