LATEST INTELLIGENCE
IMPLEMENTATION
CONSIDERATIONS
FOR CABLING SUPPORTING
REMOTE POWERING
PRESENTED BY
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R
emote powering, such as Power over Ethernet
(PoE), is a popular method of dc power delivery
using communications cabling, with more than
100 million nodes installed around the globe. Power
over Ethernet has evolved, from initially sourcing up
to 15 watts at the power source equipment (PSE) as
specified in IEEE Std. 802.3af-2003, increasing to
up to 30 watts in IEEE Std 802.3at-2009, and now
increasing further by IEEE P802.3bt project to source
up to 90 watts at the PSE.
It is important to note that all PoE powering levels
and classifications comply with the SELV (Safety Extra
22
INTELLIGENTCIO
Low Voltage) 60 volts and LPS (Limited Power Source)
100 VA (watts) requirements in IEC 60950-1, making
PoE a low-risk, reliable, and cost-effective application
for delivering power over the same balanced twisted-
pair cabling used for data communications.
Cabling infrastructure standards development
organisations such as TIA, ISO/IEC, CENELEC,
and NEC have published and/or are developing
specifications with design, installation and
operational guidelines to facilitate reliable and
robust deployment of remote powering networks,
including PoE.
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