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Foundation of FTTH Fiber Forest Household Basics (Photo)

When it comes to FTTH, you must first talk about fiber access. Fiber access refers to the transmission media with optical fiber between the bureau and the user. Fiber access can be divided into source light access and passive light access. The main technology of optical fiber user network is the optical wave transmission technology. At present, the reuse technology of optical fiber transmission is quite fast, and most of them are practical. According to the level of fiber deepening users, it can be divided into FTTC, FTTZ, FTTO, FTTF, FTTH, etc.


FTTH (Fiber to the Home), as the name suggests, is a fiber directly to the family. Specifically, FTTH refers to the installation of the optical network unit (onu) at home users or business users. It is the optical access application type that is closest to the user except FTTD (optical fiber to the desktop) in the optical access series. The significant technical characteristics of FTTH are not only providing greater bandwidth, but also enhance the transparency of the network of data format, rate, wavelength, and protocols, relax the requirements of environmental conditions and power supply, and simplify maintenance and installation.

The advantage of FTTH is mainly 5 points:

First, it is a passive network. From the end of the game to the user, it can basically be a passive in the middle;


Second, its bandwidth is relatively wide, and the long distance is exactly in line with the large -scale use of operators;

Third, because it is a business carried on the fiber, there is no problem;

Fourth, because its bandwidth is relatively wide, the support protocol is more flexible;


Fifth, with the development of technology, including point -to -point, 1.25g, and FTTH methods have formulated more complete functions.

In the family, there are fttb (FIBER to the Building) fiber to the building, FTTC (Fiber to the Curb) fiber to the roadside, FTTSA (Fiber to the Service Area) fiber to the service area.

FTTB (Fiber to the Building): It means that the fiber to the building is a broadband access method based on optimizing the high -speed fiber local area network technology. +LAN’s broadband access network (referred to as FTTB), which is the most reasonable, most practical, and most economical broadband access method. FTTB broadband access is to use single -mode fiber high -speed networks to realize Gigabit to community and LAN to buildings, and ten trillion to users. Since FTTB seems to be a local area network in the Internet, there is no need to dial with FTTB, and the FTTB dedicated line can access the Internet. Users can access the Internet as long as they turn on. Of course, FTTB access ISP will not be as busy as ordinary dial -up Internet access. FTTB Internet access is only fast or slow, and will not cause access to busy. Because of FTTB on the Internet, you have not accessed the internet through the phone exchange network. Only occupying broadband network resources, and when browsing the Internet with FTTB, the telephone fee is not incurred.

FTTB, the requirements for hardware requirements are the same as ordinary LAN: Computers and 10M Ethernet cards, so it is very small for users. FTTB high -speed special online users can not only enjoy all Internet businesses, but also query information, seek help, mail and communications, e -commerce, stock securities operations through the Internet, but also enjoy many broadband value -added services provided by ISP, distance education, remote medical, interaction, interaction Video (VOD, NVOD), interactive games, broadcast videos, etc., and FTTB and HFC can fully ensure the bandwidth of each user, because the final 10M bandwidth of each user is exclusive.

The advantage of FTTB as a high -speed Internet method is obvious, but we should also see that ISP must invest a lot of funds to laid high -speed networks to each user’s home. Therefore Most netizens need a lot of work.




: Fiber to the node, fiber to nodes




: Fiber to the zone, fiber to the community





: Fiber to the cabinet, fiber to the handover box





: Fiber to the Curb, fiber to the roadside




: Fiber to the building, fiber to the building



: Fiber to the premise, fiber to the user’s site



: Fiber to the home, fiber -to -house




: Fiber to the office, fiber to the office

In different application environments, the optical cables used also have structural differences in order to cope with special needs in the environment.

As shown above, in the traditional FTTX wiring environment. In the process of distributing from the Bureau of Equipment and step by step, various different optical cables and fiber -fiber jump lines often need to be used alternately. When the central computer room at the end of the bureau goes to the FTTC roadside or the transfer box, the main cable generally uses large cores to bury layer of twisted outdoor armor optical cables, such as GYTA, GYTS, etc.

Conventional outdoor multi -core optical cable & conventional outdoor cabinet

After the main cable is entered into the handover box, the tail fiber in the secondary main cable that goes out and then goes out is melted with the tail fiber in the ODF integrated module, and directly enter the wiring environment of the FTTB optical fiber to the building. The secondary trunk cable at this stage generally uses a smaller outdoor overhead or pipeline optical cable, such as GyxtW.


Common outdoor centers beam tube & commonly used corridor fiber fiber fiber box

In the corridor split box or spanning box, after the secondary main cable is entered, after the second -level dusk or the fiber of the household tail fiber, the home optical fiber can reach each household, which is our fiber line. The final end. In this environment, because most families are individual units and the wiring environment is complicated, the optical cables adopted are smaller and more flexible. Mainly introduced, FTTH entry optical fiber jump line.

Before introducing FTTH home optical fiber jump lines, we will briefly introduce the butterfly leather line optical cable.


Leather light cables are commonly known as interior suspension routing optical cables. It is in the center of the optical communication unit (optical fiber), and two parallel non -metal enhanced components (FRP) or metal enhanced components are placed on both sides. , Low smoke, halogen -free, flame retardant) protective cover. Because its cross section is symmetrical butterfly, it is called a butterfly leather light cable. The leather line optical cable is mainly divided into two structures: outdoor self -inherited butterfly leather line optical cable and indoor non -self -end butterfly leather -shaped leather cable.

Outdoor self -inherited butterfly leather line optical cable & indoor non -self -inherited butterfly leather line optical cable

In the traditional FTTH wiring, for the convenience and fast connection of construction, the method of using leather cable+optical fiber quickly connectors when entering the household, and the fast -moving wiring. This method does not need to budget the length of the budget in advance, and does not need to use a fiber fiber melting machine. The construction is indeed convenient and fast. It was once the most widely used household in FTTH.


Various fast fiber connectors

However, there is an unavoidable fatal defect in the fiber fast connector

One: Because the end end of the fiber fast connector is quickly connected at the scene, the pulling force at the joints does not have a reliable guarantee, and it is better to resist the fiber jump line at the prefabricated end.

Second: The loss of the optical fiber fast connector is unstable, and its loss, in addition to the quality of the fiber fast connection itself, is also related to the construction of the fiber of the fiber. Optical fiber ports are uneven, which will cause too much optical fiber loss. And the staff on the spot is not all professional and reliable technology.


Third: In the later period, in order to solve the problem of uneven ports in the cutting fiber of the construction operator. Generally, when the optical fiber is used fast, the fiber matching cream will be configured to solve the problem of inconsistency of the optical fiber cut port. However, the new problem has arisen again. Because the sealing performance of the fast connection itself is not very good, the optical fiber matching cream also has a service life. The fiber fiber matching cream will fail in about 1 year. The situation is more troublesome to subsequent fiber repair.

In the above three reasons, after a period of popularity for a period of time, the popularity is slowly decreased. In the current FTTH environment, only in the temporary fiber repair and fast wiring, the fiber will be used as a short replacement as a spare replacement. use. The market where the FTTH leather line fiber -fiber jumped by the prefabricated end of the fiber fiber was quickly connected, and it became hot again. Although the fiber -fiber jumper at the prefabricated end requires the length and quantity of the optical fiber jump line in advance, but its reliable stability eventually won the market recognition!

Conventional indoor thread jumping line & conventional outdoor leather jump line


2 Core split -type leather line jumping line & 4 core branch -type leather line jumper

In recent years, the pre -ended leather line jump has been developed again. Due to the above conventional leather line jump lines, most of them are only suitable for use in the indoor environment. In the actual FTTX wiring environment, the fiber box in FTTB, FTTB, the split box in FTTB. In many cases, it is not in the corridor. Especially at the beginning of the optical fiber households, the rural wiring environment, FTTB is installed under the hug environment of the outdoor, and the introduction of the households. In this environment, the leather line jump must have a waterproof function, and the tensile resistance at the interface must have relatively stricter requirements. The conventional FTTH leather line jumper can no longer be competent to build a wiring in this environment. Therefore, a new type of outdoor FTTH waterproof joint leather line entry fiber jumper came into being. Corning and China Huawei both designed a number of outdoor FTTH leather line mini-SC joints.

MINI-SC on the Huawei port


MINI-SC that adapts to Corning port

Configure the waterproof fiber box for outdoor-SC special waterproof adapter