This blog post is part of a series called “CommScope Definitions,” in which we will explain common terms in communications network infrastructure.
managers are seeking ways to simplify their networks. The Power over Ethernet
(PoE) standard (IEEE 802.3) is one such
simplification that was introduced by a working group of Institute of
Electrical and Electronics engineers in 2003.
PoE is a revolutionary concept which allows power to be delivered on the
same twisted pair cable that is being used for communication, instead of laying
a separate power cable to the network device.
This technology was initially used for supporting Wi-Fi access points
which are mounted in ceilings or walls.
The original IEEE
802.3af-2003 PoE standard provides up to 15.4 W of DC power. Of this, only 12.95 W is available at the end
of 100 m at the powered device as some power dissipates in the cable. Subsequently,
an updated IEEE 802.3at-2009 standard introduced PoE Plus which provides up to
30 W of PSE power with an assured power of 25.5 W at the end of 100 m to the
powered device. This update by IEEE has
opened doors for many other devices including surveillance and monitoring
equipment that can be powered using PoE Plus.
CLICK TO TWEET: Learn the definition of PoE from CommScope.
also led to questions around whether or not this technology could be used for powering
other high-end network devices such as point of sale systems, kiosks, terminals
and a variety of other devices, including security card readers and LED lights.
With the upcoming IEEE 802.3bt standard, this could become a reality with up to
90 W of power sourced from the PSE and delivered over balanced twisted pair
Despite increased power
efficiencies using Category 5e or Category 6 cables, there are potential
implications around heating. However,
this can be overcome by the adoption of Category
6A cables which typically offer less cable heating under
high-power PoE applications. CommScope’s GigaSPEED
exceeds the Category 6A standards defined by the TIA Standard and imVision®
Automated Infrastructure Management helps to manage the PoE
infrastructure by keeping track of the power carried by each cable and each
factors that need to be considered when contemplating the use of PoE include:
between the bundles for airflow
and cords being used in the channel
and channel lengths
of these considerations play a significant role in designing an efficient and
robust PoE infrastructure. With the newly
anticipated standard, it is interesting to note that many of the IP applications
located in the ceiling such as LED lighting, fire alarm systems, and occupancy
sensors, will get a new lease of connectivity where providing and maintaining a
power source proved to be challenging.
The ceiling has always
been an area that is hard to access, therefore solutions addressing these
challenges facilitate the design. CommScope’s Universal
Connectivity Grid (UCG) and Ceiling
Connector Assembly (CCA) field terminated connector can greatly simplify
the installation process for the customer.