This Standard provides generic requirements for telecommunications pathways and spaces. Included are separation and isolation considerations for operating environment compatibility, telecommunications facility diversification recommendations to ensure operation in catastrophic conditions, and temperature and humidity requirements.  Architectural (e.g. room size and firestopping) and environmental (e.g. HVAC,  grounding and bonding, and electromagnetic noise reduction) design guidance is also provided.

ANSI/TIA-569-D “Telecommunications Pathways and Spaces” was developed by the TIA TR‑42.3 Pathways and Spaces Subcommittee and published in April, 2015. This Standard specifies requirements for telecommunications pathways and spaces in commercial and multi‑tenant buildings, access provider spaces, and service provider spaces where entrance rooms, distributor rooms, enclosures, racks and cabinets and other telecommunications facilities and infrastructure is located.  Pathway locations include areas above the ceiling, access and cellular floor systems, cable support systems, underfloor duct and insert systems, perimeter pathways and surface mount pathways, and utility columns.

Significant changes from the previous edition include:

  • Incorporation of revised temperature and humidity requirements from TIA-568-C.1
  • Inclusion of a smaller minimum recommended size for distributor rooms
  • Clarification of requirements for pull boxes
  • Deletion of maximum height requirements for racks and cabinets (a maximum recommended height is still provided)
  • Reduction of the minimum access headroom above cable trays from 300 mm (12 in) to 200 mm (8 in)
  • Revised recommendations for separating power wiring from balanced twisted-pair cabling
  • New requirements for metallic spaces
  • New requirements for multi-user telecommunications outlet assembly and consolidation point spaces

ANSI/TIA-569-D-1 “Addendum 1, Revised Temperature and Humidity Requirements for Telecommunications Spaces” published in October, 2016 and revises the humidity range specifications in TIA-569-D. Specifically, this Standard lowers both the recommended and allowable humidity range for classes A1 through A4 to harmonize with the fourth edition of ASHRAE’s “Thermal Guidelines for Data Processing Environments” Standard, which published in 2015. Several small inconsistencies within Table 2 of TIA-569-D were also corrected.

ANSI/TIA-569-D  Content

  • Environmental Compatibility
  • Diversity of Telecommunications Facilities
  • Building Spaces
  • Access Provider Spaces and Service Provider Spaces
  • Multi-Tenant Building Spaces
  • Building Pathways
  • Cabling Installation Requirements
  • Cabling Transmission Performance and Test Requirements
  • Annexes addressing Firestopping and Electromagnetic Noise Reduction Guidelines for Balanced Twisted-Pair Cabling

ANSI/TIA-569-D-1 Content

  • Replacement of clause 6.2

Example of Pathways and Spaces in a Single-Tenant Building

Pathways and Spaces in a Single-Tenant Building

Distributor Room Sizing

  • The distributor room shall be sized to meet known requirements such as the function of the room, the numbers of equipment and racks needed, and the number of equipment outlets that it will serve
  • Sizing shall include projected future as well as present requirements
  • A distributor room containing Distributor B should be sized at a minimum of 9 m2 (100 ft2)
  • A distributor room containing Distributor C should be sized at a minimum of 11 m2 (120 ft2) in buildings with a gross area of up to 50,000 m2 (500,000 ft2)
  • In larger buildings, the size of the distributor room containing Distributer C should be increased in increments of 1 m2 (10 ft2) for every increase of 10,000 m2 (100,000 ft2) in gross building area

Minimum Floor Space Based on Number of Outlets Served

Temperature and Humidity Requirements

  • ASHRAE Class A1, A2, A3, and A4 environmental requirements for telecommunications spaces are provided
  • Temperature and humidity specifications provided for distributor rooms, distributor enclosures, entrance rooms or spaces, access provider spaces, service provider spaces, and common distributor rooms are as follows:
    • Temperature: 18 – 27°C (64 – 81°F)
    • Maximum relative humidity (RH): 60%
    • Minimum dew point: 5.5°C (42°F)
    • Maximum dew point: 15°C (59°F)

Click here for archive information on ANSI/TIA-569-C.

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