Edimax GS-5424PLC, User Manual

Page: 15 / 221

25
III-1-3 Power over Ethernet (PoE) Considerations
For PoE switch models, consider the following information:
Devices considered a Power Sourcing Equipment (PSE), can support up to 30 Watts per
PoE port to a Powered Device (PD).
Model Power Dedicated to PoE PoE Ports PoE Standard Supported
GS-542PLC 400W 1 to 24 IEEE802.3at/af
Ports 1-24 provide PoE power supply functionality with a maximum output power up to
30W each port. This can supply power to PDs such as internet phones, network cameras,
wireless access points. Connect the switch PoE port directly to the PD port using a
network cable.
When connecting switches capable of supplying PoE, consider the following information:

Switch models with PoE function are PSEs. These models are capable of supplying DC
power to attached PDs, such as VoIP phones, IP cameras, and wireless access points
(APs). PoE switches. Additionally, PoE switches are capable of detecting and
supplying power to pre-standard legacy PoE Power Devices. Due to the support for
legacy PoE, there is a possibility that PoE switches acting as a PSE may inadvertently
detect and supply power an attached PSE, including other PoE switches. This false
detection may result in a PoE switch operating improperly and unable to supply
power to attached PDs.

The prevention of a false detection can be easily remedied by disabling PoE on the
ports that are used to connect PSEs. Another simple practice to prevent a false
detection is to first power up a PSE device before connecting it to a PoE switch.

When a device is falsely detected as a PD, disconnect the device from the PoE port
and power recycle the device with AC power before reconnecting it to the PoE port.