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Introduction  
  Cables are designed according to user needs. The needs can be derived from volume of signal required (fibers count), type of signals (single mode or multi mode), environment need (Indoor, outdoor, inside equipment, panel patching.), installation method (pulling tension.) and cost effectiveness.

The tight buffered, loose buffered cable is mainly for indoor usage. Its design provides the structure to protect individual fibers during handling, routing and connectorization. Hence avoid expensive engineering and splicing panel cost.

As tight buffered name suggested, the buffering material is in direct contact with the fiber. This design is suitable for pigtails to spice to outdoor plant cable in splicing tray. OCE makes tight buffered fiber ribbon for interconnecting in panel and equipment where real estate is premium. It also provides better fibers management.

The tight buffered fiber can be further strengthen by kevlar and jacketed by PVC sheath into simplex cord. The kevlar strength members keep the tensile load away from the fiber. The kevlar also used to clamp cable to connector housing, so prevent stress on the fiber into the ferrule. Its all-dielectric construction provides immunity against EMI interference. The simplex cord small diameter and bending radius allow installation in tight and constrained area in the indoor cable plant.

The simplex cord can be used for interconnecting between equipment, panels, equipment to panels and intra-building over short or long distance (indoor) by connectors (SC, ST, FC, LC and MT-RJ). The thickness of sheath usually defines the cable's duty. Standard 2.4mm for standard need 2.9mm for heavy duty and 2.0mm for light duty.

Often 2 fibers are needed for duplex transmission in equipment. Therefore 2 simplex cords are zipped together for the requirement. If the cable is in heavy traffic area, the zip cord is easily split to two, additional sheath can be jacketed. In cases where cable is used for backbone cabling, the cable has to carry its own weight over floors, additional kevlar are used before the second PVC sheath is jacketed.

In extremely ragged location, simplex cords are stranded around central strength member and jacketed into breakout cable. The maximum number of fibers in breakout cable is 24 cords. The central strength member can be used to carry its weight over very high riser. The kevlar in the simplex cords provide tension to connect to equipment on the destination floor. The central strength member is used to provide additional tension for pulling during installation.

For extremely high fibers count requirement, the tight buffered fiber are surrounded with kevlar and jacketed by PVC.

The material used for indoor cables can be arranged for general, plenum or riser environments.