Power Over Ethernet (Poe) - Dell C9000 Series Networking Configuration Manual

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
0
1
2
3
PoE+ Only
4
NOTE: Legacy devices are identified as class 0 and are allocated 15.4 W.
In a C1048P stack, the power supplies in each PE distribute PoE only to the ports on the port extender, not to
other stack units.
Topics:
• Configuring PoE or PoE+
• Manage Ports using Power Priority and the Power Budget
• Setting the Threshold Limit for the PoE Power Budget

Power over Ethernet (PoE)

Power Range (Watts)
0.44 to 12.95
0.44 to 3.84
3.84 to 6.49
6.49 to 12.95
12.95 to 25.5
Classification Current (MA)
<5.0
10.5
18.5
28
40
Power over Ethernet (PoE)
43
872