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Fiber Optic Cables

Overview Of Aerial Fiber Cables

Date: 2015-1-16 17:04:51



It is very common to use aerial fiber cables in optical communication nowadays. We can even see the aerial fiber cable hanging in the pole around our daily life. In order to adjust to the harsh outdoor environment and prevent fiber theft, aerial fiber cable is made up of different materials that is not same as a typical cable. Today, we will take you to learn more about aerial fiber cables.

What Is Aerial Fiber Cable?

Aerial fiber cable is a type of fiber optic cables that is usually used for outside installation on poles. Due to its installation environment, the design of aerial fiber cable must to consider to protect it from the destruction of the nature and man-made damage or theft. Aerial fiber cable laying method is not hard to implement as it can utilize the existing overhead pole line to install that saves more in construction costs and shortens the construction period. Aerial fiber cables are mainly used for secondary trunk level and below and usually applied to flat terrain or low fluctuation area. Aerial fiber cables are easily affected by the natural disasters, such as typhoons, ice, floods etc. as well as the influence of an outside force and the mechanical strength weakening in theirselves. Therefore, the failure rate of aerial fiber cables are higher than the pipeline or directly buried fiber optic cables.

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Types of Aerial Fiber Cable

According to the installations methods, aerial fiber cables are generally divided into two main types. One is the catenary wire style and the other is the self-supporting style. The former is regular outdoor loose tube cables that can be helically lashed to a messenger or another cable (common in CATV). The self-supporting style cables (also called all-dielectric self-supporting or ADSS cable, the common style such as figure 8 aerial cables), have cable bonded to an insulated steel or all dielectric messenger for support. They are usually made of heavier jackets and stronger metal or aramid strength members. Nowadays, the self-supporting aerial fiber cables are more widely used by people.

As the common see self-supporting aerial fiber cables, figure 8 self-supporting aerial fiber optic cables are designed for easy and economical one- step installation and widely used in long haul and building network communication. According to the structures and materials of the cables, there are several kinds of figure 8 self- supporting aerial fiber cbales in the market, such as GYTC8S, GYXTC8Y, GYXTC8S etc. We can see the differences between GYTC8S, GYXTC8Y and GYXTC8S through the detailed information as the following:


GYTC8S

GYTC8S is a typical self-supporting outdoor fiber optic cable. It's suitable for aerial applications while its nice moisture resistance performance and crush resistance performance are suitable for duct and buried method. The mental strength member is made up of stranded wires as the supporting part that are completed with a polyethylene(PE) sheath to be figure 8 structure. Corrugated steel tape armored and PE outer sheath provide the crush resistance and gun shot resistance features. As the central strength, the steel-wire strength member improves the tensile strength. In addition, it is surrounded by the loose tube and water blocking system.

Features
Excellent mechanical and environmental performanceSmall cable diameter, self-supporting, easily to installLow dispersion and attenuationCorrugated steel tape armored and PE outer sheath providing crush resistance and gun shot resistance featuresCross section shows figure 8Stranded wires as self supporting member providing excellent strain performance and convenient installationSteel-wire strength member provides good tensility,ensures tensile strengthWater blocking system to improve the water proof ability

GYXTC8Y

GYXTC8Y is a light self-supporting cable with the figure 8 shape in the cross section that is suitable for installation in aerial environment for long haul communications. High tensile strength of stranded wires meet the requirement of self-supporting. It can also be used for duct and buried method. The mental strength member is similar to the GYTC8S. Steel wires and loose tubes filled with water proof compound to ensure compact and longitudinally water blocking.

Features
Excellent mechanical and environmental performanceSmall cable diameter, light cable weight, self-supporting, easily to installLow dispersion and attenuationMedium Density Polyethylene Jacket: low friction installation, excellent protection from environmental hazardsStainless steel or galvanized steel self-supportingLoad-supporting element is made of zinc-coated wire provides high resistance grade to long tensionHigh strength loose tube that is hydrolysis resistantLight self-supporting cable with the figure 8 shape

GYXTC8S

GYXTC8S is also suitable for installation in aerial environment for long haul communications. This kind of figure 8 aerial cables is usually for 4 cores to 12 cores types. The water resistant tape provides water tight property. Corrugated steel tape and the PE outer sheath provide crush resistance and gun shot resistance. The figure 8 steel wire works as self-supporting member providing excellent strain performance and convenient installation.

Features
With Small cable diameter, light cable weight, self-supportExcellent mechanical and environmental propertiesProper design and precise control for fiber excess lengthCorrugated steel tape and the PE outer sheath ensure crush resistance and gun shot resistanceThe water resistant tape provides water tight property

Tips for Aerial Fiber Cable Installation

When implementing the aerial fiber cable installation, we always in two ways: lashing a fiber optic cable to a steel messenger or direct installation of self-supporting figure 8 aerial fiber optic cables. There are some tips for better aerial fiber cable installation as following:

Firstly, we should make it clear that what problems we might meet during the installation. The following three points are the mostly common problems:
Dead end pole: Dead end pole is a utility pole on which self-supporting figure 8 aerial cable or a steel messenger is tensioned and terminated into a dead-end fixtureMessenger span: Messenger span refers to the length of continuous steel messenger tensioned between two dead-end polesIntermediate poles: Intermediate poles are all the poles between two dead-end poles

A perfect planning solution is necessary before any aerial cable installations:
Preparation: Cable route survey should cover all necessary parties including utilities, street depart, etc. In addition, you should get approval from all involved parties. Sufficient clearance for new cable along the right of way should be confirmed during the route surveyTry to use the possible existing poles in order to save cost and shorten the construction periodFiber optic cables should occupy the uppermost available communications space on a pole due to the nature of themSufficient clearances must be maintained between fiber optic cables and electrical power cables on joint-use poles. In the process, you need to refer to current National Electrical Safety Code for the proper clearancesYou must to evaluate the existing dead-end pole and see whether they can withstand the stresses during aerial cable installation. You have to evaluate whether temporary guying is needed in order to relieve the temporary unbalanced loading during cable installationSplice locations are chosen to allow for the longest possible continuous cable spans and a minimum number of splices. In addition, they should be easily accessible to a splicing vehicle. This process is usually confirmed during the cable route surveyAerial installation should never be done in wet conditions. What's more, to ensure safety, all personnel must be properly trained for pole line workFiber optic cables (including all dielectric cables) should be properly grounded when installed in the vicinity of high-voltage power cables

Safety During Installation
To minimize the risks of an accident in the work area, follow the existing rules for setting up warning signs, barricades, manhole guards, and conesBefore pulling cable directly from a figure-8 configuration, make sure that the area inside the loop of the cable (figure-8) is clear of personnel and equipment. Failure to do so may result in injury to the personnel or damage to the cableEnsure that the tools and equipment used for the cable installation are in proper working order. Improperly functioning equipment may damage cables or cause injury to personnelBe careful when working near electrical hazards, if electric lines are passing through or near the right-of-way where installation is being performedBond all metallic components in the underground system together. At all points where anyone may come in contact with the metallic components of the underground cable system, ground the bonded metallic components to a proper earth ground to avoid electric hazards produced by power lines or any other means

Summary

We mention aerial fiber cables and something about the aerial installation above. However, after learning this paper, it often comes down a question. When considering aerial fiber optic deployment, which types of aerial cable solution is most cost effective for you. ADSS cable is more expensive than loose tube cable (using in catenary wire style installation), but labor and material costs can be lower for ADSS. And while ADSS hardware on a cost-per-pole basis is higher, this is often offset by the elimination of strand or lashing wire. In a word, explore your options based on your situation and then decide what makes the most sense for you. For example, in areas where a strand is already in place, catenary wire style could be more cost effective, while the opposite might be true in an area without a strand in place.


Warm tips: As a professional optical communication products manufacturer and supplier, Efoncable can offer a wide variety of fiber optic cable choices for your cable deployment item. Efoncable figure 8 cable has corrugated steel tape armor construction, which excellently supports the fiber cables to withstand the tensile force for long haul aerial installations. We provide different fiber counts to meet your specification, and any length is available. In addition, we can also support the cable custom service for your unique requirement. All products are through a professional inspection to ensure highly quality. Moreover, the low cost option we offered maybe a good solution for your tension budget. We welcome any technical or products consultation of you over E-mail sales@efoncable.com or our website.



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