Chapter 1: Overview
44
Power Over Ethernet
The GS980MX/10HSm, GS980MX/18HSm, GS980MX/28PSm and
GS980MX/52PSm switches feature PoE on twisted pair ports. With PoE,
the switches supply DC power to network devices over the same twisted
pair cables that carry the network traffic.
PoE can make it easier to install networks. The selection of a location for a
network device can be limited by whether there is a power source nearby.
This often limits equipment placement or requires the added time and cost
of having additional electrical sources installed. With PoE, you can install
PoE-compatible devices wherever they are needed without having to
worry about whether there are power sources nearby.
A device that provides PoE to network devices is referred to as power
sourcing equipment (PSE). It functions as a central power source for other
network devices.
Devices that receive their power from a PSE are called powered devices
(PD). Examples include wireless access points, IP telephones, webcams,
and even other Ethernet switches.
The GS980MX/10HSm, GS980MX/18HSm, GS980MX/28PSm and
GS980MX/52PSm switches automatically determine whether devices
connected to their ports are powered devices. Ports that are connected to
network nodes that are not powered devices (that is, devices that receive
their power from another power source) function as regular Ethernet ports,
without PoE. The PoE feature remains activated on the ports but no power
is delivered to the devices.
PoE Standards The GS980MX/10HSm, GS980MX/18HSm, GS980MX/28PSm and
GS980MX/52PSm switches support these PoE standards:
PoE (IEEE 802.3af): This standard provides up to 15.4 watts at the
switch port for powered devices that require up to 13.0 watts.
PoE+ (IEEE 802.3at): This standard provides up to 30.0 watts at
the switch port for powered devices that require up to 25.5 watts.
The GS980MX/10HSm and GS980MX/18HSm switches support this
additional PoE standard:
PoE++ (IEEE 802.3bt): This standard provides up to 90.0 watts at
the switch ports for powered devices that require up to 71.0 watts.
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