Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 872

43 Power over Ethernet (PoE) The PoE feature supports electrical power and transmission of data on Ethernet cabling. A single cable can provide both a data connection and electrical power to the attached devices such as wireless access points or IP cameras. The PoE feature is supported on a C1048P port-extender (PE); PoE is not supported on the C9010 switches. PoE, as described by IEEE 802.3af, specifies that a maximum of 15.4 W can be transmitted to Ethernet devices over the signal pairs of an unshielded twisted pair (UTP) cable. PoE is useful in networks with IP phones and wireless access points because separate power supplies for powered devices (PD) are not needed. Power over Ethernet plus (PoE+), as described by IEEE 802.3at, supplies a maximum of 30.0 W. This provides sufficient power for devices that require 12.95 W to 25.5 W, such as pan-tilt-zoom (PTZ) security cameras, 802.11n WiFi access points, and IP phones with advanced features such as video conferencing. To manage PoE on port-extender ports, the C1048P uses two types of power supplies: the main internal, fixed AC power supply and an external DC power supply. Each power supply provides 1000 W, of which PoE uses up to 850 W. For more information about C9010 power supply installation and troubleshooting, see the Dell Networking C9010 Getting Started Guide. Table 66. Classes of Powered Devices Class Power Range (Watts) 0 0.44 to 12.95 1 0.44 to 3.84 2 3.84 to 6.49 3 6.49 to 12.95 PoE+ Only 4 12.95 to 25.5 Classification Current (MA)