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x600 Series Layer 3 Gigabit Ethernet Switches Installation Guide
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Power Over Ethernet
The following discussion applies to the x600-24Ts-POE Gigabit Ethernet
switch only.
The 10/100/1000Base-T ports on the x600-24Ts-POE switch feature
Power over Ethernet (PoE). PoE is a mechanism for supplying power to
network devices over the same twisted pair cables used to carry network
traffic. This feature can simplify network installation and maintenance by
allowing you to use the switch as a central power source for other network
devices.
A device that receives its power over an Ethernet cable is called a
powered device (PD). Examples of such devices can be wireless access
points, IP telephones, web cams, and even other Ethernet switches. A
powered device connected to a port on the switch will receive both
network traffic and power over the same twisted pair cable.
There are several advantages that the PoE feature of the x600-24Ts-POE
switch adds to the installation and maintenance of your network. First,
because the switch acts as the central power source for your powered
devices, adding an uninterruptible power source (UPS) to the switch
increases the protection not just to the switch itself from possible power
source problems but also to all of the powered devices connected to it.
This can increase the reliability of your network by minimizing the impact
to network operations from a power failure.
PoE can also simplify the installation of your network. A frequent issue in
selecting a location for a network device is whether there is a power
source nearby. This often limits equipment placement or requires the
added cost and time of having additional electrical sources installed. With
PoE, you can install PoE-compatible network equipment wherever they
are needed without having to worry about whether they are near a power
source.
The switch automatically determines whether or not a device connected to
a port is a powered device. A powered device has a signature resistor or
capacitor that the switch can detect over the Ethernet cabling. If the
resistor or capacitor is present, the switch assumes that the device is a
powered device.
Power Budgeting The x600-24Ts-POE Gigabit Ethernet Switch provides a maximum of
15.4 W per port on all 24 ports for a total power consumption of 370 W,
while at the same time furnishing standard 10/100/1000 Mbps Ethernet
functionality.