Lantronix
SESPM1040-541-LT-xx Install Guide
33772 Rev. F
Page
27
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64
Cable and Cabling
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The 802.3bt standard allows Cat 5e for 60W but requires Cat 6 cable for 90W.
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You can use Category 5e or 6A cable, but remember:
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Cat 6A has larger bundle sizes,
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Cat 6A can go longer reaches with PoE, and
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Category 6A is 4.3 W more efficient per link.
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For Cat 5e use 4-pair Category 5e or higher. Use UV-resistant Cat5e or Cat 6 cable.
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If the channel is standards compliant Cat 5e to Cat 6A at 100 meters or less, the PD will get the power it
needs.
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Standards governing cabling PoE:
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IEEE 802.3bt Task Force: overall standard governing equipment and cabling.
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TIA TSB-184-A: Technical Service Bulletin on “Guidelines for Supporting Power Delivery Over Balanced
Twisted-Pair Cabling”.
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ISO/IEC TR-29125 and CENELEC TR 50174-99-1 (International cabling guidelines for PoE++).
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ANSI/TIA-568-C.2 (familiar standard covering cabling performance).
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IEC 60512-99-002 (standard for connectivity with engaging / disengaging PoE).
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Recommend: understand ambient temperature and bundle temperature specs and requirements.
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The 2017 NEC® Code applies to power supplied over a communications cable when power levels are over 60
watts (i.e., for PoE++ Type 4).
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Heat of cable is governed by Ambient temperature, Type of PoE used, Category cable type (and its
implementation), and Bundle size. Consult your cable vendor for specific performance.
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If using more than one 90W port, alternate ports (i.e., no adjacent 90W ports). Use ports 1 and 3, or ports 1
and 4, or ports 2 and 4. Exception: using ports 2 and 3 for 90W each is allowed.