This Telecommunications Systems Bulletin  provides guidelines to enable the support of a wide range of safety extra low voltage (SELV) limited power source (LPS) applications using remote power supplied over balanced twisted-pair cabling.  Examples of these types of applications include LAN devices supported by IEEE Std 802.3™ DTE Power, wireless access points, TIA-862-A building automation, and security devices such as remote cameras, IP telephones, and multimedia devices.

TSB-184 “Guidelines for Supporting Power Delivery Over Balanced Twisted-Pair Cabling” was developed by the TIA TR-42.7 Copper Cabling Subcommittee and published in July, 2009. TSB-184 contains the following guidance:

  • Category 5e or better cabling is recommended for new installations delivering remote power
  • DC loop resistance and resistance unbalance of cabling is defined
  • End-span and mid-span remote powering configurations are provided and cabling recommendations provided
  • Guidance on strategies to minimize cabling temperature rise is provided

TSB-184 Content

  • Configuration, Structure, and Topology
  • Cabling Selection and Performance
  • Installation Guidelines
  • Transmission Requirements
  • Remote Powering Configurations and Related Transmission Performance
  • Annex on Additional Installation Guidelines


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