Honeywell 51195479-400 I/O Link Cable Set Original New Condition For Files Rev C

FO Cable Construction There are generally two types of FO cable construction as far as how the actual optical fibers are placed in the cable: • Loose tube • Tight buffered Loose tube refers to a type of construction where there are actual tubes within the cable that may contain up to 12 strands of fiber. This type of construction was originally developed for outside plant cables and often contained gel in the tubes as a water blocking device to protect the strands of fiber. This type of cable is more labor intensive to terminate because the tubes must be “broken out”, which is to say that a device has to be secured to the end of the tube that fans out the individual fiber strands and protects that junction. The strands also have to be inserted in a tight buffer tube to protect them and provide something for the connector strain relief to attach to. Tight buffered is typically the construction of choice today. In this type of cable, each strand has its own jacket extruded over it in the manufacturing process. Typically a water absorbing material will be used in place of gel as a water blocking mechanism. Because of this, it is much easier to prepare the cable for termination. Additionally a central strength member is often manufactured into the cable. This can either be a fiberglass, nylon, or metallic strand in the center of the cable. It is recommended to avoid metallic strength members, because these make the cable an electrical conductor that must be properly grounded.

Air Blown Fiber A completely separate technology is air blown fiber (ABF). ABF separates the conventional FO cable into its two components, the outer jacket and the FO strands. The outer jacket component is actually a tube that contains a number of smaller tubes within the outer jacket. The FO strand component is actually a foam covered bundle of FO strands. The FO bundle is literally “blown” along the tubes by either pressurized air or nitrogen. The advantage to this technology is the ability to install a minimum number of FO strands and then, at a later time, blow additional bundles in unoccupied tubes for either greater capacity or a different type of fiber. Costs of this technology initially are comparable with conventional fiber; however, adds, moves, and changes are much more cost effective providing the initial tube layout was done correctly. Honeywell has had success with this technology in the chemical, refining, and paper industries and can help customers determine if this system is appropriate for their particular sites.

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HONEYWELL 51195479-400 I/O LINK CABLE SET(LINKS FOR FILES) REV C

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