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