Cisco Systems WSC2960X48TDL Bedienungsanleitung PDF herunterladen (Seite 90)

The initial allocation for Class 0, Class 3, and Class 4 powered devices is 15.4 W. When a device starts

up and uses CDP or LLDP to send a request for more than 15.4 W, it can be allocated up to the maximum

of 30 W.

Note

The CDP-specific power consumption requirement is referred to as the actual power consumption

requirement in the software configuration guides and command references.

Note

If the switch detects a fault caused by an undervoltage, overvoltage, overtemperature, oscillator-fault, or

short-circuit condition, it turns off power to the port, generates a syslog message, and updates the power

budget and LEDs.

The PoE feature operates the same whether or not the switch is a stack member. The power budget is per-switch

and independent of any other switch in the stack. Election of a new active switch does not affect PoE operation.

The active switch keeps track of the PoE status for all switches and ports in the stack and includes the status

in output displays.

The stacking-capable switch also supports StackPower, which allows the power supplies to share the load

across multiple systems in a stack when you connect the switches with power stack cables. You can manage

the power supplies of up to four stack members as a one large power supply.

Power Management Modes

The switch supports these PoE modes:

• auto—The switch automatically detects if the connected device requires power. If the switch discovers

a powered device connected to the port and if the switch has enough power, it grants power, updates the

power budget, turns on power to the port on a first-come, first-served basis, and updates the LEDs. For

LED information, see the hardware installation guide.

If the switch has enough power for all the powered devices, they all come up. If enough power is available

for all powered devices connected to the switch, power is turned on to all devices. If there is not enough

available PoE, or if a device is disconnected and reconnected while other devices are waiting for power,

it cannot be determined which devices are granted or are denied power.

If granting power would exceed the system power budget, the switch denies power, ensures that power

to the port is turned off, generates a syslog message, and updates the LEDs. After power has been denied,

the switch periodically rechecks the power budget and continues to attempt to grant the request for

power.

If a device being powered by the switch is then connected to wall power, the switch might continue to

power the device. The switch might continue to report that it is still powering the device whether the

device is being powered by the switch or receiving power from an AC power source.

If a powered device is removed, the switch automatically detects the disconnect and removes power

from the port. You can connect a nonpowered device without damaging it.

You can specify the maximum wattage that is allowed on the port. If the IEEE class maximum wattage

of the powered device is greater than the configured maximum value, the switch does not provide power

to the port. If the switch powers a powered device, but the powered device later requests through CDP

messages more than the configured maximum value, the switch removes power to the port. The power

that was allocated to the powered device is reclaimed into the global power budget. If you do not specify

Catalyst 2960-X Switch Interface and Hardware Component Configuration Guide, Cisco IOS Release 15.0(2)EX

78 OL-29034-01

Configuring PoE

Power over Ethernet Ports

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