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Power over Ethernet (PoE)
PoE standards
The GS970M/10PS, GS970M/18PS and GS970M/28PS switches feature
Power over Ethernet (PoE) on the 10/1000BASE-T and 100BASE-TX
ports. PoE is used to supply power to network devices over the same
twisted pair cables that carry the network traffic.
The main advantage of PoE is that it can make it easier to install a
network. The selection of a location for a network device is often 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. But 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 other network devices is referred to as
power sourcing equipment (PSE). The GS970M Series switches act as
PSE units by adding DC power to the network cable, thus functioning as a
central power source for other network devices.
Devices that receive their power from PSE are called powered devices
(PD). Examples of PD include wireless access points, IP telephones,
webcams, and even other Ethernet switches.
The switch automatically determines if a device connected to a port is a
powered device. 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.
The GS970M Series PoE switches support these PoE standards:
PoE (IEEE 802.3af): This standard provides up to 15.4 watts at the
switch port to support powered devices that require up to 12.95
watts.
PoE+ (IEEE 802.3at): This standard provides up to 30.0 watts at
the switch port to support powered devices that require up to 25.5
watts.
GS9790M Series Switch Installation Guide
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