ZyXEL Communications ES-2024PWR Handbuch

Andere Handbücher für ES-2024PWR

2

Dieses Handbuch passt für folgende Modelle

9

Inhaltsverzeichnis

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POE

Ethernet Switch

ZyNOS 4.00

Support Notes

Version 4.00 October 2011

PoE Support Note

All contents copyright (c) 2011 ZyXEL Communications Corporation.

2

Overview of Power over Ethernet

Power over Ethernet or PoE technology describes a system to pass electrical power safely, along

with data, on Ethernet cabling. The IEEE standard for PoE requires category 5 cable or higher for high

power levels, but can operate with category 3 cable for low power levels. Power is supplied in common

mode over two or more of the differential pairs of wires found in the Ethernet cables and comes from a

power supply within a PoE-enabled networking device such as an Ethernet switch or can

be injected into a cable run with a midspan power supply.

The original IEEE 802.3af-2003 PoE standard provides up to 15.4 W of DC power (minimum 44 V

DC and 350 mA) to each device. Only 12.95 W is assured to be available at the powered device as

some power is dissipated in the cable.

The updated IEEE 802.3at-2009 PoE standard also known as PoE+ or PoE plus, provides up to 25.5

W of power. The 2009 standard prohibits a powered device from using all four pairs for power. Some

vendors have announced products that claim to be compatible with the 802.3at standard and offer up

to 51 W of power over a single cable by utilizing all four pairs in the Cat.5 cable.

The following table shows the IEEE 802.3af power classification of the Powered Devices.

This is a number from 0 to 4, where each value represents a range of power (W) that the PD

requires to function. The ranges are as follows.

Class 0 - Default, 0.44 to 12.94 W

Class 1 - Optional, 0.44 to 3.84 W

Class 2 - Optional, 3.84 to 6.49 W

Class 3 - Optional, 6.49 to 12.95 W

Class 4 - Reserved (PSEs classify as Class 0)

Benefits

•Lower Cost –External “wall wart”power supplies can be eliminated.

•Flexible access point location –Wireless access points no longer need to be located near

AC power source or need power lines and outlets.

•Remote management –IP phone, WLAN access points can be powered up or down

remotely.

PoE Support Note

All contents copyright (c) 2011 ZyXEL Communications Corporation.

3

EndSpan & MidSpan

There are two kinds of PoE solutions in the world, Endspan and Midspan. Usually a PoE

switch would be an endspan solution, while a PoE Injector would be a midspan solution. (ex.

PoE-12, PoE-80)

Alternative A is also called “Endspan”, which means that data and power are in the same

twisted pairs. Power is carried over the data pairs (1/2 & 3/6)

Alternative B is also called “MidSpan” which means that data and power are NOT in the

same twisted pairs. Power is carried over the spare pairs (4/5 & 7/8)

PoE Support Note

All contents copyright (c) 2011 ZyXEL Communications Corporation.

4

Our PoE

Our products (switch & injector) which support IEEE 802.3af-2003: ES-2024PWR,

ES-2108PWR, ES-3124PWR, GS1500-24P, GS2200-24P, PoE-10, PoE-12, PoE-80.

Our products (switch & injector) which support IEEE 802.3at-2009:

GS2200-8HP (only port 1~4 have HP), PoE12-HP.

Scenario

We connect PoE-enabled devices to our switch (GS2200-8HP), and then we proceed

to set up PoE on the switch.

PoE Support Note

All contents copyright (c) 2011 ZyXEL Communications Corporation.

5

How to configure PoE (GS-2200-8HP)

1. Click Basic Setting > PoE Setup in the navigation panel to display the

screen as shown below. Use this screen to configure PoE settings.

2. You can choose the PoE mode (GS2200-8HP only has consumption mode)

and enable PD & PD priority.

PoE Support Note

All contents copyright (c) 2011 ZyXEL Communications Corporation.

6

3. After configuring PoE settings we need to use CLI to enable PoE on the

port-interface.

PoE Support Note

All contents copyright (c) 2011 ZyXEL Communications Corporation.

7

Configuration using the CLI

Command Examples

1. Enable PoE on port interface and set usage threshold and MIB traps.

sysname# configure

sysname(config)# pwr interface 1-4

sysname(config)# pwr usagethreshold 25

sysname(config)# pwr mibtrap

sysname(config)# exit

2. Check the PoE status in CLI

GS2200# sh pwr