Setup Guide
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, N2024P, N2048P , N3024P, or N3048P port-extender (PE); PoE is not supported on the
C9010 switches.
PoE, as described by IEEE 802.3af, species 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 sucient 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, xed AC power supply and an
external DC power supply. Each power supply provides 1000 W, of which PoE uses up to 850 W.
The N2024P and N2048P switches have an internal 1000-watt power supply feeding up to 24 PoE devices at full PoE+ power (850W). An
additional external power supply (MPS1000) provides 1000 watts and gives full power coverage for all 48 PoE devices (1800W).
The N3024P and N3048P switches support one or two 1100-watt eld-replaceable unit (FRU) power supplies. The N3024P switch comes
with a single 715-watt power supply (the default conguration), and supports either one or two 1100-watt supplies. For the N3048P
switch, an 1100-watt power supply is the default conguration. A single 1100-watt power supply can feed up to 24 PoE devices at full PoE+
power (950W). Dual-equipped switches feeds feed up to 48 PoE devices at full PoE+ power (1800W), as well as provide power supply
redundancy.
For more information about C9010 power supply installation and troubleshooting, see the Dell Networking C9010 Getting Started Guide.
Table 76. Classes of Powered Devices
Class Power Range (Watts) Classication Current (MA)
0 0.44 to 12.95 <5.0
1 0.44 to 3.84 10.5
2 3.84 to 6.49 18.5
3 6.49 to 12.95 28
PoE+ Only
4 12.95 to 25.5 40
NOTE: Legacy devices are identied 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:
• Conguring PoE or PoE+
• Manage Ports using Power Priority and the Power Budget
• Setting the Threshold Limit for the PoE Power Budget
44
814 Power over Ethernet (PoE)