Chapter 1: Overview
29
Power over Ethernet
The section explains the Power over Ethernet (PoE) Power Sourcing
Equipment (PSE) feature for the following IE340 switches:
IE340-12GP
IE340-20GP
IE340L-18GP
The IE340-12GT switch does not support PoE PSE.
The PoE PSE feature allows the switches to supply electrical power to
network devices over the same twisted pair cables that carry network
traffic. The feature can simplify network installation and maintenance
because it allows you to use the switches as central power sources for
other network devices.
Devices that receive their power over Ethernet cables are called powered
devices (PD). Examples of PDs include wireless access points, IP
telephones, web cams, and even other Ethernet switches. A PD
connected to a port on the switch receives both network traffic and power
over the same twisted-pair cable.
PoE Versions The IE340 PoE PSE switches support the following versions of PoE:
PoE (IEEE 802.3af, IEEE 802.3at Type 1)
PoE+ (IEEE 802.3at Type 2)
Table 1 lists the switch ports that source PoE and the maximum power
levels.
Cabling
Requirements for
PoE Devices
Minimum cable requirements for twisted pair ports when sourcing PoE are
listed here:
PoE devices: Standard TIA/EIA 568-compliant Category 3,
shielded or unshielded cabling.
Table 1. PoE Sourcing Ports and Maximum Power Levels
PoE
Version
Port Numbers Maximum
Power Output
at Switch Port
Maximum
Power at PD
IE340-12GP IE340-20GP IE340L-18GP
PoE 5 to 12 5 to 20 3 to 18 15.4W 12.95W
PoE+ 5 to 12 5 to 20 3 to 18 30.0W 25.5W
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