D-Link DXS-3600 Series Guia do Utilizador descarregar pdf (Página 7)

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What is Power over Ethernet (PoE)?

Power over Ethernet allows a single cable to provide both

data connection and electrical power to any PoE-enabled

devices such as Wireless Access Points, network cameras and

IP phones. PoE passes electrical power along with data on

Ethernet (LAN)cabling to network devices. It allows you to

install and power wireless access points, network cameras and

VoIP phones.

With PoE you only need one cable for both power and data

so wireless access points and Video Surveillance cameras,

for example, can be installed without having to run power

to inaccessible places such as ceilings and roofs. You can

also protect such devices from outages, by adding a central

Uninterruptible Power Supply (UPS), and both monitor

and manage energy consumption centrally - perhaps even

switching devices o when they’re not needed. Support for

PoE can be added to existing networks but, if you’re serious

about it, PoE enabled switches don’t need additional wiring

and are easier to manage. Either way check for support for

industry standards, both on the switches and networking

devices you want to power.

What is PoE power budget?

The PoE power budget is the maximum amount of power that

a switch can provide to all the devices connected to it. If this

is exceeded then devices will not function correctly as they

are not receiving adequate power. In order to choose the right

switch the overall power consumption for the network must

be calculated. This can be done by adding up the maximum

power consumption of every device connected to the switch.

It is essential to consider the current and future power

requirements of the network, since over specifying the power

budget of a switch will result in higher initial costs. D-Link has

two Smart switch families to address dierent requirements,

Smart and Smart+. The Smart+ range has higher power

budgets and is capable of providing higher power per port

than the Smart range which is more economical.

PoE devices can transmit a Discovery Protocol that informs

the PoE Switch of the actual power required by the device.

If the power is less than the default 15.4W/25.5W, the PoE

switch acknowledges the request with its available power

and modies the power budget accordingly. If the requesting

powered device exceeds the power budget for the switch, the

port is either powered down, or the port remains in low power

mode.

IP Phones

IP phones are commonly connected and powered by PoE.

A standard IP phone will consume around 4-7W of power

whereas one with a backlit, colour screen or even video

conferencing capability will use substantially more.

Wireless Access Points

Due to their placements Wireless Access Points typically use

PoE to power themselves. Dierent types of Wireless APs

have dierent power requirements. For example, dual-band

concurrent APs require more power as they broadcast on both

the 2.4 and 5 GHz frequencies. The latest Wireless AC technology

delivers wireless speeds of up to 1300 Mbps on the 5GHz

band with enhanced coverage and can benet from PoE+’s

additional power.

IP Cameras

There are several types of IP cameras from a basic box camera

to an outdoor pan, tilt and zoom (PTZ) speed dome camera

with an integrated heater, each one has a dierent power

requirement.

Basic outdoor IP cameras have a power consumption of about

7W, however additional features require additional power so

that the power requirements increases. An outdoor PTZ will

require a signicantly larger amount of power.

PoE (Power Over Ethernet)

PoE

DAP- 3690

DAP- 2690

DGS-1210-28P

DSR-500N

Voip Phone

Internet

DCS- 7513

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