ANSI SCTE-122-2012 pdf download SCTE Recommended Optical Fiber Cable Types for Outside Plant Drop Applications
4.0 TYPICAL INSTALLATION APPLICATIONS The optical drop cable serves as the direct link from the service provider distribution network to the subscriber. The installation parameters and requirements for the drop cables will often mirror those imposed on the distribution cable network serving these drops. Typically, if the distribution plant is an aerial installation; then the drop cables are installed aerially. Conversely, if the distribution plant is underground; then the drop cables are installed underground. A more detailed discussion of these installation methods can be found in ANSI/SCTE 86.
4.1 Aerial An aerial optical drop cable installation typically entails placement of an appropriate length of optical cable from pole to the residence. These cables are self supported and use of a separate, independent messenger wire is not used in normal practice.
4.2 Direct Buried A direct-buried optical drop cable installation typically involves placement of an appropriate length of optical cable from a handhole, downlead from aerial plant or pedestal to the residence. The optical cable is inserted into the ground either manually or with a mechanized plow. These cables may include a metallic tracer wire for subsequent location purposes if desired.
4.3 Duct While not commonly used, some deployments may place a duct run between the distribution network and the residence. If employed, the optical drop cable is pulled into place from one end of the duct. This type of installation may require a prime mover device (can be manual, a mechanized winch, or cable jetting equipment), a tension measuring device, and compatible lubricant to allow the cable to slide through the conduit with reduced frictional drag.
5.0 TYPICAL OPTICAL FIBER DESIGNS Due to the typical short lengths of these applications (less than approximately 30 to 45 meters (100 to 150 feet)), dispersion-unshifted (“standard”) single-mode optical fiber will provide acceptable levels of performance. Other single-mode optical fiber types may be considered on a case-by-case basis for special applications. A more detailed discussion of these installation methods can be found in ANSI/SCTE 86.
6.0 TYPICAL OSP OPTICAL DROP CABLE DESIGNS A number of different optical drop cable designs have been developed. These cables typically contain no more than 12 optical fibers, located loosely in a buffer tube. Excess fiber length within the buffer tube allows the cable to stretch without inducing stresses on the fiber itself. The basic aim of each of these designs is similar – to protect the optical fibers from damage during installation and environmental conditions over their useful service lifetime. Different application and “handleability” considerations will determine specific preferences of one cable type over another. The cable designs presented in this document are the most commonly used in the telecommunication industry today.