Cisco 220 Series Smart Plus Administration Manual page 117

Power-over-Ethernet
PoE Considerations
!
CAUTION
!
CAUTION
Cisco 220 Series Smart Plus Switches Administration Guide Release 1.0.0.x
Model Power Dedicated
to PoE
SG220-50P 375 Watts
As a Power Sourcing Equipment (PSE) device, the switch for the following models
with the country of destination (China) can deliver a maximum of 30 Watts per PoE
port to a Powered Device (PD).
Model Power Dedicated
to PoE
SF220-24P 180 Watts
SF220-48P 375 Watts
SG220-28MP 375 Watts
The switch should be connected only to PoE networks without routing to the
outside plant.
Consider the following when connecting switches capable of supplying PoE:
The PoE models of the switches are Power Sourcing Equipments (PSEs) that are
capable of supplying DC power to attaching Powered Devices (PDs). These
devices include VoIP phones, IP cameras, and wireless access points. The PoE
switches can detect and supply power to pre-standard legacy PoE Powered
Devices. Due to the support of legacy PoE, it is possible that a PoE switch acting as
a PSE may mistakenly detect and supply power to an attaching PSE, including other
PoE switches, as a legacy PD.
Even though PoE switches are PSEs, and as such should be powered by AC, they
could be powered up as a legacy PD by another PSE due to false detection. When
this happens, the PoE switch may not operate properly and may not be able to
properly supply power to its attaching PDs.
To prevent false detection, you should disable PoE on the ports on the PoE switches
PoE Ports PoE Standard Supported
1 to 48 802.3at on port 1 to 4, and
802.3af on port 5 to 48
PoE Ports PoE Standard Supported
1 to 24 802.3at
1 to 48 802.3at
1 to 48 802.3at
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