Configuration Guide User guide

FastIron Configuration Guide 661
53-1002494-02
Power over Ethernet overview
With the Endspan solution, there are two supported methods of delivering power. In Alternative A,
four wires deliver data and power over the network. Specifically, power is carried over the live wire
pairs that deliver data, as illustrated in Figure 59. In Alternative B, the four wires of the spare pairs
are used to deliver power over the network. Brocade PoE devices support Alternative A.
The Endspan method is illustrated in Figure 59.
FIGURE 59 PoE Endspan delivery method
PoE midspan method
The PoE Midspan method uses an intermediate device, usually a PD, to inject power into the
network. The intermediate device is positioned between the switch and the PD and delivers power
over the network using the spare pairs of wires (Alternative B). The intermediate device has
multiple channels (typically 6 to 24), and each of the channels has data input and a data-plus-
power RJ-45 output connector.
The Midspan method is illustrated in Figure 60.
PoE Endspan Delivery Method
Switch with Power over Ethernet ports
Power and data signals travel
along the same pairs of wires at
different frequencies.
IP phone
CONSOLE
POWER
PS1
PS2
ACT
LINK
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49C
50C
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FastIron Edge 4802 POE