C
HAPTER
14
| Basic Administration Protocols
Power Over Ethernet
– 395 –
WEB INTERFACE
To set the overall PoE power budget for switch:
1. Click Administration, PoE.
2. Select Configure Global from the Step list.
Figure 219: Showing the Switch’s PoE Budget
SETTING THE PORT
POE POWER BUDGET
Use the Administration > PoE (Configure Interface) page to set the
maximum power provided to a port.
CLI REFERENCES
â—† "Power over Ethernet Commands" on page 777
â—† "Time Range" on page 572
COMMAND USAGE
â—† This switch supports both the IEEE 802.3af PoE and IEEE 802.3at-2009
PoE Plus standards. To ensure that the correct power is supplied to
powered devices (PD) compliant with these standards, the first
detection pulse from the switch is based on 802.3af to which the
802.3af PDs will respond normally. It then sends a second PoE Plus
pulse that causes an 802.3at PD to respond as a Class 4 device and
draw Class 4 current. Afterwards, the switch exchanges information
with the PD such as duty-cycle, peak and average power needs.
â—† All the RJ-45 ports support both the IEEE 802.3af and IEEE 802.3at
standards. The total PoE power delivered by all ports cannot exceed the
maximum power budget of 195W. This means that up to 5 ports can
supply a maximum 34.2W of power simultaneously to connected
devices (802.3at), up to 12 ports can supply up to 15.4W (802.3af), or
all 26 ports can supply up to 7.5W (802.3af).
â—† If a device is connected to a switch port and the switch detects that it
requires more than the power budget set for the port or to the overall
switch, no power is supplied to the device (i.e., port power remains
off).
â—† If the power demand from devices connected to all switch ports
exceeds the power budget set for the switch, the port power priority
settings are used to control the supplied power. For example:
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