Standard for Optical Fiber Drop Cable
|Publication Date:||5 March 2019|
This Standard covers optical fiber communications cables intended for use in outdoor and indoor/outdoor optical fiber drop applications. Materials, construction, and performance requirements are included in this Standard, together with applicable test procedures.
Optical fiber communications cables within the scope of flame-retardant compact and rugged drop cables for MDU and FTTX applications, as defined by ICEA S-115-730, may include specific types of drop cables. For these types of drop cables, the requirements of S-730 supersede the requirements of this Standard, except by agreement between manufacturer and user.
Refer to other published ICEA cable product standards for information for optical fiber cable requirements for other applications:
• S-104-696 for optical fiber communications cables intended for use in other combined indoor/outdoor applications
• S-87-640 for optical fiber communications cables intended for use in other outdoor applications
• S-83-596 for optical fiber communications cables intended only for indoor use
• S-112-718 for optical fiber cable for placement in sewers
• S-115-730 for optical fiber cable for multiple-dwelling units and other FTTX applications
• S-119-741 for fiber to the antenna cables
• S-120-742 for distributed antenna system cables
• S-122-744 for microduct cables
Products covered by this Standard are intended for operation under conditions normally encountered in the last portion of all-optical networks. This space exists from the Network Access Point (NAP) which is typically the access point into the distribution network, or other hardware serving that purpose, ending at or inside the subscriber premises. These products convey communications signals (voice, video, and data) between the communications network and the subscriber premises. Products covered by this Standard may be factory or field terminated with connectors or other telecommunications hardware as appropriate.
Products covered by this Standard may be designed for aerial installation-either self-supporting or lashed to messengers or other cables. These products may be designed to be installed underground-direct buried, trenched, or installed in ducts by any of a number of methods.
When a hybrid cable (a cable with both optical fibers and metallic conductors) is required, the applicable metallic conductor requirements shall be as established by agreement between the customer and the cable manufacturer. The requirements of ICEA S-84-608, the filled OSP copper cable standard, should be considered when determining appropriate requirements.
For the purposes of this standard, user premises are defined as residential properties and small to medium sized businesses located in facilities that can be served by an optical cable having 12 or fewer fibers, with typical distances less than or equal to 100 m in length. Most applications will only require cables with four or fewer fibers. Fiber counts higher than 12 are permitted. Products covered by this Standard are not intended for use in extended distance applications, which are typically characterized by higher fiber count cables and which specify more stringent design and performance requirements. The suitability of products covered by this Standard in applications other than those for which they are intended should be as agreed upon between the manufacturer and user.
For the purposes of this document, the standard tensile rating represents the maximum allowable installation load for the cable.
The standard tensile ratings for products covered by this Standard are:
• 1335 N (300 lbf) for cables designed for installation by pulling
• 440 N (100 lbf) for cables that are direct-buried, placed in the ground by trenching equipment, or blown into ducts
The residual load is defined as a load equivalent to 30% of the standard tensile rating, as related to all cable designs, except aerial self-supporting.
For self-supporting aerial applications, there may be additional considerations based on the particular application, which need to be addressed to ensure that the cable design is appropriate for the self-supporting distance [typically 30 m (100 ft) or less] and environmental loading requirements. See 7.24 and Annex C for information on aerial plant requirements and considerations.
For aerial applications in which the drop cable is lashed to a separate messenger wire, the use of a cable designed for installation by direct burial, trenching, or pulling into duct may be adequate. The tensile rating of the type of cable chosen shall apply to requirements in this Standard.
Minimum Bend Diameter
For cables not having a circular cross-section, bend diameter requirements are to be determined using the thickness (minor axis) as the cable diameter and bending in the direction of the preferential bend.
For cases in which the aforementioned bend diameters (e.g., cables with very small diameters or thicknesses) are not appropriate, the unloaded and loaded bend diameters shall be agreed upon between manufacturer and user.
Fire tests may be applicable based on the specific drop cable application. Users of this document are encouraged to consult pertinent Building and Fire Codes, such as those described in 1.9, to ensure product compliance to the requirements for a particular installation.
For purposes of this document, cables intended strictly for outdoor use need not be listed for fire-resistance. Cables intended for indoor use, or which transition from outdoor to indoor, may be required to be tested and marked with the appropriate fire-resistance listing as referenced in 1.9.
The choice of materials needed to achieve adequate fire-resistance may impact the ability of such cables to be handled at low temperatures.