Automation Canada - Cables & Connectors Issue - 14

A VITAL POE TEST PARAMETER

PoE Types, Standards and Classes

If you're already installing low-voltage twisted-pair cabling for
networks, you should be familiar with the need to certify the cable plant
to ensure standards compliance and achieve a vendor warranty. While
cable certification ensures that parameters such as length, attenuation,
crosstalk and return loss are in accordance with industry standards,
when it comes to PoE there's another parameter to consider.

Since PoE standards and types are a bit confusing and encompass a
wide range of power, classes are used to further define the power. There
are a total of eight classes ranging from Class 1 with just 4 W delivered,
to Class 8 with the maximum 90 W delivered as shown in the table
above.
To ease implementation, the Ethernet Alliance has a PoE certification
Program for easily identifying PSE and PDs by class to determine
compatibility. This program uses a 300-page test plan and approved
equipment to certify products and provides a simple,
easy-to-understand marking system. Just look at the marks and if the PSE
is equal or higher to the PD, they are compatible.

Ethernet Alliance Marks for PDs (left) and PSE (right)

C A N A D I A N A U TO M AT I O N

As previously mentioned, PoE is delivered via common mode split
between pairs and between conductors of a pair. For this power split to
happen, the DC resistance between two conductors in a pair and the
DC resistance between pairs must be balanced. If DC resistance is not
balanced, it can cause PoE to malfunction and distort the data signals
transmitting on the same pairs. Industry standards specify the maximum
DC resistance unbalance within a pair and from pair-to-pair.

VOLUME 3, ISSUE 2

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Automation Canada - Cables & Connectors Issue

Table of Contents for the Digital Edition of Automation Canada - Cables & Connectors Issue

Automation Canada - Cables & Connectors Issue - 1
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