Cisco Systems WSC2960X48TDL Uživatelský manuál stáhnout pdf (Strana 89)

Powered-Device Detection and Initial Power Allocation

The switch detects a Cisco pre-standard or an IEEE-compliant powered device when the PoE-capable port is

in the no-shutdown state, PoE is enabled (the default), and the connected device is not being powered by an

AC adaptor.

After device detection, the switch determines the device power requirements based on its type:

•

A Cisco prestandard powered device does not provide its power requirement when the switch detects

it, so a switch that does not support PoE+ allocates 15.4 W as the initial allocation for power budgeting;

a PoE+ switch allocates 30 W (PoE+).

The initial power allocation is the maximum amount of power that a powered device requires. The switch

initially allocates this amount of power when it detects and powers the powered device. As the switch

receives CDP messages from the powered device and as the powered device negotiates power levels

with the switch through CDP power-negotiation messages, the initial power allocation might be adjusted.

•

The switch classifies the detected IEEE device within a power consumption class. Based on the available

power in the power budget, the switch determines if a port can be powered. Table 10: IEEE Power

Classifications, on page 77 lists these levels.

Table 10: IEEE Power Classifications

Maximum Power Level Required from the SwitchClass

15.4 W0 (class status unknown)

4 W1

7 W2

15.4 W3

30 W PoE+ devices only4

The switch monitors and tracks requests for power and grants power only when it is available. The switch

tracks its power budget (the amount of power available on the switch for PoE). The switch performs

power-accounting calculations when a port is granted or denied power to keep the power budget up to date.

After power is applied to the port, the switch uses CDP to determine the CDP-specific power consumption

requirement of the connected Cisco powered devices, which is the amount of power to allocate based on the

CDP messages. The switch adjusts the power budget accordingly. This does not apply to third-party PoE

devices. The switch processes a request and either grants or denies power. If the request is granted, the switch

updates the power budget. If the request is denied, the switch ensures that power to the port is turned off,

generates a syslog message, and updates the LEDs. Powered devices can also negotiate with the switch for

more power.

With PoE+, powered devices use IEEE 802.3at and LLDP power with media dependent interface (MDI) type,

length, and value descriptions (TLVs), Power-via-MDA TLVs, for negotiating power up to 30 W. Cisco

pre-standard devices and Cisco IEEE powered devices can use CDP or the IEEE 802.3at power-via-MDI

power negotiation mechanism to request power levels up to 30 W.

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

OL-29034-01 77

Configuring PoE

Power over Ethernet Ports

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Cisco Systems WSC2960X48TDL Uživatelský manuál Strana 89