Power Over Ethernet Considerations - Cisco SF250-24 Quick Start Manual

Power over Ethernet Considerations

The switch is to be connected only to PoE networks without
W
ARNING
routing to the outside plant.
If your switch is one of the Power over Ethernet (PoE) models, consider the
following power requirement:
250 Series Switches with Power Over Ethernet
Model
SF250-24P
SF250-48HP
SG250-08HP
SG250-10P
SG250-26HP
SG250-26P
SG250-50HP
SG250-50P
SG250X-24P
SG250X-48P
Consider the following when connecting switches capable of
C
AUTION
supplying PoE:
The PoE models of the switches are PSE (Power Sourcing
Equipment) that are capable of supplying DC power to
attaching PD (Powered Devices). 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 PSE, 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
6
Power
Dedicated to
PoE
185 Watts
195 Watts
45 Watts
62 Watts
100 Watts
195 Watts
192 Watts
375 Watts
195 Watts
382 Watts
Number of Ports
Supporting PoE
1–24
1–48
1–8
1–8
1–24
1–24
1–48
1–48
1–24
1–48
Cisco 250 Series Smart Switches
PoE Standard
Supported
802.3af/at
802.3af/at
802.3af/at
802.3af/at
802.3af/at
802.3af/at
802.3af/at
802.3af/at
802.3af/at
802.3af/at