Leviton Cat 6A, Interactive Reference Manual

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In 2013, IEEE announced a task force for creating
802.3bt , which will define PoE over four pairs
and support 10GBASE-T. The standard will define
two new tiers of PoE: Type 3 for up to 60 watts,
and Type 4 for up to 100 watts. Both will support
devices requiring higher power, such as laptops,
displays, and next-generation wireless access points.
Publication of 802.3bt is expected in early 2018.
Power over Ethernet — Standards
PHY / PSE
PHY / PD
VPSE LOAD
4-Pair PoE
PHY / PSE
PHY / PD
VPSE LOAD
2-Pair PoE
In addition, in June 2016 the U.S. National Fire
Protection Association (NFPA) voted for changes
to the 2017 National Electric Code (NEC) that affect
PoE. The NEC provides standards for installing
electrical wiring and equipment in the United States,
and while not a law, it is commonly adopted by states
and cities around the country. The NFPA voted
to create a new ampacity table to be referenced
when the power supplied to conventional cables
exceed 60 watts. This table, included in NEC
article 725, governs the maximum cable bundle
size allowed for conventional telecommunications
cables with various temperature ratings, carrying
various level of PoE. The Telecommunications Industry Association (TIA)
and the International Organization for Standardization
(ISO) have updated standards that address cabling
to support 4-pair PoE in accordance with 802.3bt.
TIA TSB-184-A Guidelines for Supporting Power
Delivery Over Balanced Twisted-Pair Cabling and
the ISO/IEC TS29125 “Information Technology —
Telecommunications Cabling Requirements for
Remote Powering of Terminal Equipment” both
offer cabling guidelines to support IEEE 802.3bt
four-pair PoE, as well as other applications. These
documents provide guidance on maximum bundle
size for different category cables based on installation
conditions and the maximum power delivered (15.4,
30, 60, or 100 watts).
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