Approved: May 5, Representing the telecommunications industry in association with the Electronic Industries Alliance. TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manuf acturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchas er in selecting and obtaining with minimum delay the proper product fo r their particular need. The existence of such Standards and Publications shall not in a ny respect preclude any member or nSon-member of TIA from manufacturing or selling products not conforming to such Standards and Publications.
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At that time, standards are reaffirmed, rescinded, or revised according to the submitted updates. Contributing organizations More than 70 organizations within the telecommunications industry contributed their expertise to the development of this Standard including manufacturers, consultants, end users, and other organizations.
Documents superseded This is the third issue of this Standard. These manuals provide practices and methods by which many of the requirements of this Standard are implemented. Other references are listed in annex C. Annexes Annex A and B are normative and considered as requirements of this Standard. Annex C is informative and not considered as requirements of this Standard.
Introduction General Telecommunications, as used in this Standard, refers to all forms of information e. Purpose The purpose of this Standard is to enable the planning and installation of an outside plant structured cabling system infrastructure.
This Standard establishes the recommendations and requirements used in the design of the telecommunication pathways and spaces, and the cabling installed between buildings or points in a customer-owned campus environment. Customer-owned campus facilities are typically termed "outside plant" OSP.
For the purpose of this Standard they are termed, customer-owned OSP. Stewardship Telecommunications infrastructure affects raw material consumption. The infrastructure design and installation methods also influence product life and sustainability of electronic equipment life cycling. These aspects of telecommunications infrastructure impact our environment. Since building life cycles are typically planned for decades, technological electronic equipment upgrades are necessary.
The telecommunications infrastructure design and installation process magnifies the need for sustainable infrastructures with respect to building life, electronic equipment life cycling and considerations of effects on environmental waste. Telecommunications designers are encouraged to research local building practices for a sustainable environment and conservation of fossil fuels as part of the design process.
Mandatory and advisory terms In accordance with TIA Engineering Manual, two categories of criteria are specified; mandatory and advisory. Mandatory criterion generally applies to performance and compatibility requirements. Advisory criterion represents "above minimum" goals. Metric equivalents of US customary units The dimensions in this Standard are metric or US customary with soft conversion to the other.
Life of this Standard This Standard is a living document. The criteria contained in this Standard are subject to revisions and updating as warranted by advances in building construction techniques and telecommunications technology. This standard specifies the cabling, pathways and spaces to support the cabling.
The OSP pathway includes the pathway through the 6 point of entry into the building space. Customer-owned OSP pathways may include aerial, direct-buried, 7 underground e. At the time of publication, the editions indicated were valid. All standards are subject to 15 revision, and parties to agreements based on this Standard are encouraged to investigate the possibility 16 of applying the most recent editions of the standards published by them.
Specific requirements are found in the normative clauses of 87 this Standard. See also conduit, raceway. Generally part of the HVAC system of a building. Damage prevention laws usually specify the location of this zone. A transmission pipeline usually operates at a pressure of kPa psi or more, or at a hoop stress of 20 percent or more of its specified minimum yield strength regardless of its operating pressure.
The customer-owned OSP cabling infrastructure shall meet the requirements of the authority having jurisdiction AHJ and applicable codes.
Figure 2 illustrates a variety of customer-owned OSP pathways and spaces. There are two basic types of cable pathway systems: underground and aerial with exceptions for surface and above-ground conduit following the route of another above-ground utility. Self-supporting cables, which include a messenger wire, may also be used.
Customer-owned OSP connecting hardware may be located on the exterior or interior of a building, or in an outdoor telecommunications pedestal or cabinet. In these cases it may not be possible to cable the buildings in a star topology. Each campus segment may connect to a hub location that would support the area as a star topology. These hub locations may be connected with other topologies to support equipment and technologies normally used for wide area applications e.
When entrance point diversity is developed, entrance points should be established distant from each other, preferably entering the building from two or more different streets. When entrance route diversity is developed, entrance routes should be separated by the greatest possible distance.
Therefore, more than one transmission medium is recognized. This standard specifies recognized transmission media that may be used individually or in combination. Where possible, the different media should use the same physical pathway architecture and space for connecting hardware.
In making this choice, factors to be considered include: a flexibility with respect to supported services; b required useful life of backbone cabling; and c site size and user population. In addition to helping protect personnel and equipment from hazardous voltages, a proper bonding and grounding system may reduce EMI to and from the telecommunications cabling. Improper bonding and grounding may allow propagation of induced voltages that could disrupt other telecommunications circuits.
This may include military or commercial applications, or specific specific grounding and bonding practices not required by this standard, such as MIL-STDB 18 DEC Compatibility with the environment can be achieved with enhanced cabling components or through protection, separation or isolation.
The classification for areas with mixed environments may be described by including the classification level for each variable as a subscript e. If a cabling system component crosses an environmental boundary, the component or mitigation technique should be selected to be compatible with the worst case environment to which it is exposed.
These pathways may consist of aerial, direct-buried, or underground, or a combination of these. Underground or direct-buried pathways are generally preferred over aerial pathways because of aesthetics and security. Of the two, underground pathways e. Accommodations should be made for diverse APs. In the absence of applicable codes, follow the most current version of the NESC. The following is a sample list of construction elements that need to be considered in the design and installation of subsurface pathways: a excavation; b clearances and separations from other utilities; c required depth; d buried street crossings; e encasing; f trenching; g boring pipe pushing ; h plowing; i backfill; j restoration; k horizontal directional drilling HDD ; l above ground obstructions; and m environmental considerations.
Bends made manually shall not reduce the internal diameter of the conduit. All bends shall be sweeps with a minimum radius of six times the internal diameter for conduits up to 2 inch and ten times the internal diameter for all conduits larger than 2 inch. If there is a reverse U-shaped bend in the section, a pull box shall be installed. Back-to-back degree bends shall be avoided.
Pull planning tools can assist in the design of a conduit system e. A drain slope of no less than 10 mm per meter. Where conduit extends between maintenance holes, a slope of 10 mm per meter. There are certain fundamentals to consider when placing conduit within or externally attached to these structures.
Temperature variations require compensation for expansion and contraction of bridge structures. Even relatively small concrete structures have one or more floating spans. The basic requirements for design are as follows: a Attachments to bridges shall be made with the approval of the AHJ.
Tunnels may be used as a telecommunications pathway for customer-owned OSP to interconnect buildings, or as a pathway to the property line. The telecommunications pathways within the tunnels may consist of duct, tray, or wireway. Cables placed in tunnels shall have the appropriate sheath properties for the environment and shall be clearly marked.
See figure 7 for an example of components that may be found in a utility tunnel. The location of telecommunications pathways within a tunnel shall be planned to ensure accessibility and separation from other services.
Direct burying of cable is achieved by trenching, boring or plowing.
The standards address commercial building cabling for telecommunications products and services. As of , the standard is at revision D, replacing the revision C, revision B, the revision A, and the initial issue of , which are now obsolete. These assignments are named TA and TB. Work on the standard began with the Electronic Industries Alliance EIA , to define standards for telecommunications cabling systems. EIA agreed to develop a set of standards, and formed the TR committee,  with nine subcommittees to perform the work. The standard was updated to revision B in