This Standard contains requirements that facilitate the planning and installation of a structured cabling system in a commercial building environment. The structure for commercial building cabling is based on the generic cabling system structure specified in TIA-568.D-0. Performance and technical criteria for balanced twisted-pair cabling systems are specified in TIA-568-C.2. Performance and technical criteria for optical fiber cabling systems are specified in TIA-568-C.3.

ANSI/TIA-568.D-1 “Commercial Building Telecommunications Cabling” was developed by the TIA TR-42.1 Telecommunications Cabling Systems Subcommittee and published in September, 2015.  Significant changes from the previous edition include:

  • A note indicating that category 6A horizontal cabling may be required to support a wider range of applications has been added
  • OM4 or higher rated cabling is recommended for horizontal and backbone multimode optical fiber cabling
  • The minimum fiber count for multimode and singlemode backbone optical fiber cabling has changed from one fiber to two fibers per port/channel
  • The use of optical fiber array connectors in the work area is now supported
  • Broadband coaxial cabling has been added as a recognized media for horizontal and backbone cabling
  • Requirements for open office cabling (i.e., consolidation points, multi-user telecommunications outlet assemblies) have been moved into TIA-568.D-0
  • The contents of TIA-568-C.1-1 (pathways and spaces) and TIA-568-C.1-2 (general updates) were incorporated

ANSI/TIA-568.D-1 Content

  • Telecommunications Cabling Infrastructure
  • Topology
  • Entrance Facilities
  • Equipment Rooms
  • Telecommunications Rooms and Telecommunications Enclosures
  • Backbone Cabling (Cabling Subsystem 2 and Cabling Subsystem 3)
  • Horizontal Cabling (Cabling Subsystem 1)
  • Work Area
  • Multi-Tenant Building Spaces
  • Cabling Installation Requirement References
  • Cabling Transmission Performance Requirement References
  • Cabling for Wireless Access Point References
  • Grounding and Bonding References
  • Telecommunications Pathways References
  • Firestopping References
  • Administration References
  • Annex addressing Bibliographic Information

ANSI/TIA-568.D-1 Functional Elements

NOTE – All elements shown represent cables and connecting hardware; not spaces or pathways

ANSI/TIA-568-D.1 and ANSI/TIA-568-D.0 Equivalent Terminology 

Examples of ANSI/TIA-568-D.1 Horizontal Interconnections and Cross-Connections


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