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Overcome performance-robbing heat generated by PoE and PoE Plus

Overcome performance-robbing heat generated by PoE and PoE Plus.

The development of the pending PoE Plus standards brings to light a significant new challenge in delivering power over a structured cabling system. The higher power delivered by PoE Plus devices causes a temperature rise within the cabling which can negatively impact system performance, particularly in UTP systems.

Key Facts:

  • Although safe for humans, the 600mA currents associated with the PoE Plus application generate heat in the installed cabling plant.
  • Excessive temperature rise in the cabling plant cannot be tested or mitigated in the field
  • Excessive temperature rise in the cabling plant can result in an increase in insertion loss and premature aging of jacketing materials.
  • Choosing media with improved heat dissipation performance can minimize the risks associated with excessive temperature rise.
  • Category 6A F/UTP cabling systems dissipate almost 50% more heat than category 5e cabling.
  • Category 7A S/FTP cabling systems dissipate at least 60% more heat than category 5e cabling.
  • It is reasonable to anticipate that category 6A and higher-rated cabling will be the targeted media for the support of tomorrow's high performance telecommunications powering applications.


WHITE PAPER: IEEE 802.3at PoE Plus Operating Efficiency: How to Keep a Hot Application Running Cool

75°C Rated Shielded Category 6A and 7A Solid Cables from Siemon

Siemon solid shielded category 6A and 7A cables sold worldwide are qualified for mechanical reliability in high temperature environments up to 75° C.

This higher temperature rating is especially critical for support of the IEEE 802.3 PoE Plus (Type 2) application that exhibit a temperature rise within bundled cable configurations. For cabling infrastructure expected to support power delivery to data terminal equipment, the practice recommended by industry standards is to not install 60° C rated cables in environments above 50° C. Siemon shielded category 6A and 7A cables may be installed in environments up to the maximum 60° C specified by TIA and ISO/IEC standards and will not experience mechanical degradation caused by heat build-up inside the cable bundle due to PoE remote power delivery.

Furthermore, TIA and ISO/IEC cabling standards require overall channel length to be reduced from 100 meters (i.e. “length de-rating”) to offset additional insertion loss resulting from installation in environments having an ambient temperature greater than 20°C. Siemon’s shielded category 6A cables require less than half the length de-rating of category 6A UTP cables and Siemon’s fully-shielded category 7A cables do not require any length de-rating to support 10GBASE-T and lower speed applications in environments up to 60° C.

See the Siemon Infrastructure Blog: 75°C Rated Shielded Category 6A and 7A Solid Cables from Siemon


Intelligent buildings are using more and more PoE and PoE+ enabled IP devices
and shielded cabling better supports PoE applications.

ConvergeIT: Smarter Cabling for Intelligent, Green Buildings

ConvergeIT is a converged, IP-based intelligent building cabling system using a single, simplified shielded structured cabling infrastructure for a smarter, greener building.

  • voice/data
  • video surveillance
  • access control
  • audio/video
  • fire alarms
  • energy management
  • HVAC

Learn more about ConvergeIT