St e p – Signamax Power over Ethernet Компьютерные Аксессуары User Manual

Page 5

How to Configure PoE

Step 1:

Define Your Project Objectives, Scope and Budget

A successful PoE project begins with defining what you hope to accomplish.

What is the project’s purpose? What do you need to achieve, and what would you like

to achieve, ideally? What is your budget? What is the scope of the current project?

How much future growth must it allow for, if any? What resources are available to

assist? It’s critical that you answer these questions upfront, before moving into the

next phase of the project.

Step 2:

Develop Your Project Layout/Design

Once you’ve defined and secured agreement for your project objectives, scope

and budget, you can begin to design your PoE installation. At this stage, it’s

important to determine:

The location of your PoE devices

The topology you will use

The types of devices you will use

Any installation contingencies

In selecting the types of devices, don’t assume your device is 802.3af/at compliant

just because it’s listed as PoE-capable. Since there is no requirement for PSEs to

perform both Mode A and Mode B, you must verify with the vendor documentation

which mode the specific device uses. You must also confirm the specific model

numbers and operation of the equipment required.

Step 3:

Determine Your Power Consumption Values

At this point, you’re ready to determine the power consumption of the powered

devices your project will involve.

First, determine the total load of your power sourced equipment by adding

together the power requirements of all of the powered devices. Then add a 25

percent buffer to allow for future growth.

Next, determine if the application requires PoE+ or PoE devices. This will

determine if your PSE switch will need to be PoE-capable or PoE+-capable.

Step 4:

Select Your Power Source Equipment

The power source equipment for your project can be switches (also called endspan

devices), power injectors (midspan devices), or a mix of both. The equipment must

be sized based on the ports served from a specific location or locations, including

both PoE/PoE+ ports and those that don’t require PoE/PoE+ service. The power

capacity must be sized based on the mix of ports requiring PoE and PoE+ service,

while also providing the scalability to allow for future growth. PoE solutions provided

by Signamax are ideal for these projects as they provide significant scalability.