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  Implementation of FTTH (fiber to the home) cable analysis pr>>您当前位置:主页 > Industry-News >

Implementation of FTTH (fiber to the home) cable analysis pr

作者:admin 时间:2014-05-28 22:02

In 2011, China put forward the "broadband China" strategy, in 2013 the State Council issued the "Chineseimplementation project of broadband China" strategy, which means "broadband strategy" rising from the Department to act as a national strategy, broadband to become the first national strategic public infrastructure. Therefore, the "broadband China" strategy to speed up the upgrading of broadband network, the optical fiber, substantially improveurban and rural planning integrated wiring the popularization of the broadband network and optical access ability,launched a new Internet City construction, promote the development of commercial network. About the livelihood of the FTTH (fiber to the home) the construction has already become the important development trends, this project,cable usage and integrated wiring technology requirements are relatively high, people pay more and more attention.Therefore for optical fiber to fiber optic cable households project, its structure and manufacturing process are continuously upgraded.

A, fiber to the home system

In the FTTH (fiber to the home) the entire network system, the optical cable network is divided into three parts: thefeeder fault segment, segment, with households. Because the optical fiber cable in the building, indoor, channelnarrow space arrangement, so we need to use cable structure different cabling cable different environment.

1, FTTH feeder cable from the central office to the light distribution point of the cable, the cable products andtechnology with traditional outdoor cable has no big difference, with the conventional network selection is consistent.

2, FTTH wiring cable from the cable optical distribution point to the network access point, the cable typically require frequent referrals and differences in. FTTH distribution cables usually have stranded loose tube cable, loose tubecable and skeleton type cable types, given the large number of the fiber core, frequent referrals and differences and connection, so should be used in high density optical fiber assembly, cable diameter smaller skeleton type optical fiber ribbon cable.

3, FTTH home section of the optic cable extends from the network access point to each optical fiber user,terminating in indoor or building, directly to the indoor cable connected to the ONU. When a user access point in theoutdoor, outdoor section should be used in outdoor or indoor and outdoor cable; when the user access point in theroom or building, indoor cable should be used indoor cable.

Two, FTTH optical cable

In view of the fact that the fiber core is more, need frequent referrals and differences and connection, so should be used in high density optical fiber assembly, cable diameter smaller skeleton type optical fiber ribbon cable.

The skeleton type optical fiber cable with optical fiber to the high density, diameter section pipeline resources, lateral pressure resistance performance is good, stable structure, convenient connection, no filling ointment, such as environmental protection, can fully meet the FTTB, FTTH, demand for construction and communication ability.

Skeleton type optical fiber band optical implementation is the fiber from the engine room is connected to the plurality of connecting box, then access to each residential unit, through the open window of some differences in the skeletontype optical fiber ribbon cable can be directly extracted and need to access households fiber ribbon, without thecable cut in the usual manner. Because of no connection with only very small amounts of no cable, ointment fillingwith skeleton type optical fiber cable with inherent, greatly simplify and facilitate the design and construction of FTTH. Shaft corridor access skeleton type optical fiber ribbon cable in each layer is separated from the desiredoptical fiber ribbon, into pigtail into the indoor through the connector box; the horizontal pipeline access skeletontype optical fiber ribbon cable is required in each point of the optical fiber with out into two sections, respectively,through the joint box into a pigtail into two adjacent to the tenants, cable and finally collects in the room, so as toform a similar ring of FTTH solution, the optical fiber cable to maximize the utilization of.


Three, introduction of FTTH cable

Introducing cable according to the home environment, for outdoor, indoor cable or indoor and outdoor optical cable.Fiber links to the home should adopt fiber has the advantages of simple structure, convenient operation, strongtensile strength and anti pressure performance, in order to facilitate the overhead, outdoor pipeline and the buildingwearing cloth, and ensure the reliability of cable used.

1, butterfly introducing cable

Butterfly introducing cable is the most applied FTTH home Duan Guanglan, cable structure is the optical fiber or optical fiber with unit placed in the two reinforcement among extruded with a layer of LSZH (or PVC). Reinforcementfor copper wire, but also for the aramid yarn or other suitable fiber bundle (FRP or KFRP). Strengthen a butterflycable a nonmetallic reinforcing element cable tensile strength greater metal, suitable for long distance indoor placed horizontally or short range indoor placed vertically, the non-metal stiffener butterfly cable can realize full medium into people's homes, lightning protection performance, suitable for application from outdoor to indoor.

The structure of self-supporting butterfly cable is the fiber (or optical fiber with) placed piece middle strengthening intwo parallel, wrapped in a layer of LSZH extrusion at the same time in the end is placed in parallel with a metal wireafter (also PVC). Self bearing type butterfly optical cable for indoor and outdoor optical cable, due to a suspensionunit, tensile performance is stronger, can satisfy 50 meters span tension set, suitable for the application environment into the indoor from outdoor overhead.

Pipeline households butterfly butterfly cable for cable, plus two reinforcement, and longitudinal water blockingpackets, and then extruded with a layer of PE sheath. Due to the increase in the tensile strength and waterproof performance, application environment suitable for outdoor pipes into people's homes.

2, Bian Pingquan medium into a fiber optic cable

Section profile Bian Pingquan medium into a cable with oblong, waterstop is arranged in parallel with the upper and lower sides of fiber, the use of non metal reinforcement with directional bending, superior performance and good antipressure ability, cable oblong cross-section can effectively reduce destructive to the wind load, the cable can meetvarious construction conditions harsh and complex environment, conducive to the realization of overhead laying oflarge span, suitable for the application environment into the indoor from outdoor overhead. And supporting the use of outdoor distribution box.

Because of the difference of FTTH users variety and demand, at the request of a variety of reliability of the continuous improvement of user requirements, construction cost, convenient construction and line of FTTH, manytypes of cable, fiber optic cable type should be scientific and rational choice for. 3, the small center beam tube typeintroducing cable

The small central beam tube type into the cable relative to the common cable has obvious advantages in diameterand weight. The small central beam tube type introducing cable adopt aramid strengthening component cable, can meet the requirements of tensile strength of the cable; optical fiber is generally 1-4 core G657A fiber; the outer sheath is sheathed cable diameter not greater than LSZH, 5mm, the weight is not heavier than 25kg/km, than the average minimum center tube type optical cable outer diameter is small 42%, the weight of less than 65%. Because of its small diameter, light weight, tensile and bending properties meet the requirements, suitable for the applicationenvironment into the indoor from outdoor overhead.

4, the circular introducing cable

The circular cable is introduced in the single mode or multimode optical fiber direct coating with high bonding strength of the locking sleeve material tight buffer fiber, high strength of the aramid fiber as reinforcing elements,and the extrusion of a layer of LSZH sheath in the external, structure of self-supporting circular introducing cable is to increase metal steel strand wire. Fiber optic cable sleeve has the advantages of simple structure, convenientconnection, the outer diameter of fine and soft, very suitable for indoor applications. Self bearing type circularintroducing cable suitable for application environment into the indoor from outdoor overhead. Circular introducing cable field into the end, to meet the rapid construction of network access requirements.

5 introduction, stranded cable

Fiber links to the home here stranded introduced into cable for each tube core. Fiber optic cable is a core single-mode or multimode optical fiber is sheathed in the high modulus plastic waterproof compound filled with loose tube,the cable core is a metal reinforcing element out of a layer of polyethylene, loose tube around the central reinforcing piece twisted into a compact and round cable core integration, at the same time piece around the package has been placed two shares of resistance the water in the center of the cable core yarn to strengthen, Kevlar armor afterlongitudinal covering waterstop outer extruding a layer of aluminum - polyethylene sheathed cable. Cable structurefor semi dry, each casing has only one use of optical fiber, aramid and increase its tensile force, suitable for the application environment into the indoor from outdoor overhead.

As "broadband Chinese" strategy for the continuous progress, promote FTTH projects continue to provide, the scope of application of fiber optic cable continues to expand, related technology and cable also continue to improve.Optical fiber communication network will continue to extend cable terminal, the structure has been improved, the newcable will also emerge in an endless stream. At present, the fiber has begun to reverse the situation, from the auxiliary function slowly rise as the dominant role. In addition, although the upgrading of cable and optical cableproducts will, but the will always demand around the installation environment and users, consider the reliability ofconvenient construction and line, so as to reduce cost and save resources to achieve rapid convenient and safe and reliable.




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