Duct Installation Of Fiber Optic Cable

Innerduct is available in ribbed corrugated and smooth.

Duct installation of fiber optic cable.

Compressed air is injected in the duct inlet after few hundred meters of cable is pushed into the duct. Innerduct is a way to subdivide the duct and to provide for future cable pulls. After the fiber optic cable is installed into a duct or innerduct end plugs should be installed to provide an effective water seal. Proper size and installation of the innerduct is critical for ease of cable installation.

Ducts and innerducts should be sized to meet present and future cable installation requirements. Cable blowing is the process of installation of optical fiber cable into a pre installed duct. Loose tube cables can be blown jetted or pulled into a duct or conduit that will protect the cable during its installed lifetime. In underground fiberoptic cable installation cables can be buried directly in a trench or placed into a buried duct.

Compressed air flows at high speed through the duct and along the cable. Micro duct cable is blown jetted into the micro duct. Testing fiber optic cable on the reel all optical fiber cables must be tested while on the reel prior to deployment. Three 1 25 inch inside diameter i d innerducts can usually be pulled into a 4 inch duct.

As compared to the duct the installation process is relatively very quick. Rodding is used to clear the duct passage and install the pulling rope using fiberglass pushrods. Preparations for duct installation using an air blowing method. Generally there are two approaches for optical cable installation.

The most common cables used for this type of installation are steel armored outdoor fiber cables. The most commonly deployed dielectric outdoor cable design with fiber counts from 2 to 288 fibers and up to 432 fibers for gel filled. Most micro duct fiber cable products have a tension limit of 300 lbs or lower versus 600 lbs for typical outside plant fiber cable. Installing cable is a time consuming and expensive process so it is important to ensure the cable is good before installation.

Installation crews must use blowing equipment specifically designed and tested for micro duct fiber cable to avoid damage to the cable. Table 1 commonly used cable types for various osp applications underground cable innerduct micro ducts. The pushing force is applied mainly near the cable inlet by a pushing device. Normally standard size fiber optic cables are pulled into innerduct sub ducts.

Duct cable can be hand pushed or pulled in via tape string into a micro duct. Underground direct installation directly buried installations are most common for long cross country installations. General precautions should always be applied when.