Netgear GS516TP Software Administration Manual - Page 39

PoE

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GS516TP Gigabit Smart Switches PoE A Power over Ethernet (PoE) device is power sourcing equipment (PSE) that delivers electrical power to connected powered devices (PDs) over existing copper cables without interfering with the network traffic, updating the physical network, or modifying the network infrastructure. The PoE feature manages the power being supplied or received by the switch. In addition to delivering power to PDs, the switch can receive power from another device through special PD ports. The switch derives its power from either a main power supply, which supplies 100W, or from power-supplying devices attached to its PD ports (15 and 16). The following ports supply or receive power: • PSE Ports 1-8. Supply AF power to devices attached to the switch. Power fluctuates according to the amount of power required. • PD Ports 15-16. Receive AT power, AF power or no power from external devices. The switch first consumes power for its internal circuits and uses remaining power for devices connected to ports 1-8. For this reason, the PoE PSE budget is dynamically set and is not constant. When using a 100W main power supply, the power budget of the PSE ports is 76W. The hardware performs the transition between the main power supply and the PD ports and the adjustment of the PoE power levels. The device can boot with one of the following options: • 100W main power supply • Two 802.3af PD sources (15.4W each) • One or two 802.3at PD sources (30W each) • One AF and one AT power source (15.4W, 30W, respectively) Note: • When power is received from the main power supply, the PD ports cannot receive additional power • A single 802.3af PD source cannot provide enough power for the GS516TP main board. • The switch hardware identifies whether the PD ports are receiving power and their power level (AF: 15.4W or AT: 30W). • The maximum amount of power supplied by a PSE port (ports 1-8) is set by the lower of the following values: • Maximum power value of the class of the power device connected to the port (see Table 6) • Maximum power limit configured by the user 39

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39
GS516TP Gigabit Smart Switches
PoE
A Power over Ethernet (PoE) device is power sourcing equipment (PSE) that delivers
electrical power to connected powered devices (PDs) over existing copper cables without
interfering with the network traffic, updating the physical network, or modifying the network
infrastructure.
The PoE feature manages the power being supplied or received by the switch. In addition to
delivering power to PDs, the switch can receive power from another device through special
PD ports.
The switch derives its power from either a main power supply, which supplies 100W, or from
power-supplying devices attached to its PD ports (15 and 16).
The following ports supply or receive power:
•
PSE Ports 1-8.
Supply AF power to devices attached to the switch. Power fluctuates
according to the amount of power required.
•
PD Ports 15-16.
Receive AT power, AF power or no power from external devices.
The switch first consumes power for its internal circuits and uses remaining power for devices
connected to ports 1-8. For this reason, the PoE PSE budget is dynamically set and is not
constant.
When using a 100W main power supply, the power budget of the PSE ports is 76W.
The hardware performs the transition between the main power supply and the PD ports and
the adjustment of the PoE power levels.
The device can boot with one of the following options:
•
100W main power supply
•
Two 802.3af PD sources (15.4W each)
•
One or two 802.3at PD sources (30W each)
•
One AF and one AT power source (15.4W, 30W, respectively)
Note:
•
When power is received from the main power supply, the PD ports cannot receive
additional power
•
A single 802.3af PD source cannot provide enough power for the GS516TP main board.
•
The switch hardware identifies whether the PD ports are receiving power and their power
level (AF: 15.4W or AT: 30W).
•
The maximum amount of power supplied by a PSE port (ports 1–8) is set by the lower of
the following values:
•
Maximum power value of the class of the power device connected to the port (see
Table 6
)
•
Maximum power limit configured by the user