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Connecting Devices to the Ethernet Ports
You can use this application to calculate the power supply requirements for a specific PoE configuration.
Enter the number and types of powered devices that you plan to attach to the switch, and the calculator
shows the PoE or PoE+ power required and the system power consumption.
You must be a registered Cisco.com user to access the Cisco Power Calculator. If you do not have a user
ID or password, you can register:
http://tools.cisco.com/RPF/register/register.do
For more information about the required power-supply module and the PoE specifications, see the
"Power Supply Modules" section on page 1-19
Many legacy powered devices, including older Cisco IP phones and access points that do not fully
Note
support IEEE 802.3af, might not support PoE when connected to the switches by a crossover cable.
PoE faults are caused when noncompliant cabling or powered devices are connected to a PoE port. Use
Caution
only standard-compliant cabling to connect Cisco prestandard IP Phones, wireless access points, or
IEEE 802.3af-compliant devices to PoE ports. A cable or device that causes a PoE fault must be removed
from the network.
Warning
Voice over IP (VoIP) service and the emergency calling service do not function if power fails or is
disrupted. After power is restored, you might have to reset or reconfigure equipment to regain access
to VoIP and the emergency calling service. In the USA, this emergency number is 911. You need to be
aware of the emergency number in your country. Statement 361
Warning
Voltages that present a shock hazard may exist on Power over Ethernet (PoE) circuits if
interconnections are made using uninsulated exposed metal contacts, conductors, or terminals.
Avoid using such interconnection methods, unless the exposed metal parts are located within a
restricted access location and users and service people who are authorized within the restricted
access 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
Catalyst 3750-X and 3560-X Switch Hardware Installation Guide
2-28
and
Appendix A, "Technical Specifications."
Chapter 2
Switch Installation
OL-19593-02
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