User manual

C HAPTER 15 | Basic Administration Protocols
Power over Ethernet
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ES-2000 Series
SETTING THE PORT
POE POWER BUDGET
Use the Administration > PoE (Configure Interface) page to set the
maximum power provided to a port.
COMMAND USAGE
◆ The switch only provides power to the Fast Ethernet ports. It can supply
up to 30W of power to the first six ports (based on the IEEE 802.3at
draft), up to 15.4W to 12 ports (based on IEEE 802.3af). or up to 7.5 to
24 ports (based on IEEE 802.3af).
◆ 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).
◆ 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:
■
If a device is connected to a low-priority port and causes the switch
to exceed its budget, power to this port is not turned on.
■
If a device is connected to a critical or high-priority port and causes
the switch to exceed its budget, port power is turned on, but the
switch drops power to one or more lower-priority ports.
N OTE : Power is dropped from low-priority ports in sequence starting from
port number 1.
◆ If a device is connected to a port after the switch has finished booting
up and would cause the switch to exceed its budget, power will not be
provided to that port regardless of its priority setting.
PARAMETERS
These parameters are displayed:
◆ Port – The port number on the switch.
◆ Admin Status – Enables PoE power on a port. Power is automatically
supplied when a device is detected on a port, providing that the power
demanded does not exceed the switch or port power budget. (Default:
Enabled)
◆ Mode – Shows whether or not PoE power is being supplied to a port.
◆ Priority – Sets the power priority for a port. (Options: Low, High, or
Critical; Default: Low)
◆ Power Allocation – Sets the power budget for a port.
(Range: 3000-30000 milliwatts on ports 1-6, 3000-15400 milliwatts on
ports 7-24; Default: 30000 milliwatts on ports 1-6, 15400 milliwatts on
ports 7-24)