In terms of home coverage technology, the current radio and television network still uses traditional coaxial cable or Category 5 line home broadband technology, and the basic network structure is mostly FTTB (fiber to the building) or even FTTZ (fiber to the cell). It has been difficult to meet the needs of future broadband upgrades and business expansion. Therefore, it is an inevitable trend to carry out the construction and transformation of EPON+FTTH on the basis of the general adoption of EPON+EoC mode in the broadband technology of radio and television networks.
Fiber-to-the-home technology can also become fiber-to-the-home technology, mainly using fiber optic cables as the main transmission path, and using optoelectronics to transmit TV network signals, telecommunication network signals and Internet network signals to user terminals, in order to meet the People's need for information. Optical fiber transmission technology has its own distinct characteristics, such as large information capacity, small equipment weight, strong transmission anti-interference ability, and stable information transmission. These advantages are very obvious, which also makes the previous information transmission technology abandoned.
The optical fiber transmission line mainly uses aluminum-clad steel wire, which has the advantages of good electrical conductivity, good acid and alkali corrosion resistance, and extremely superior equipment performance, which also makes the fiber-to-the-home technology the most cost-effective and applicable A wide range of signal transmission forms. With the continuous development of fiber-to-the-home technology, we must clearly see the shortcomings of fiber-optic technology.
In the process of fiber-to-the-home, holes need to be punched, and line laying needs to be open line laying, which also brings a series of problems to users, which arouses the dissatisfaction of the people. Therefore, this requires telecom operators to continuously Only in this way can fiber-to-the-home technology meet the needs of more and more people.
Advantages of Fiber to the Home
Advantages of FTTH fiber to the home
First, according to the two strong standards of the Ministry of Industry and Information Technology on fiber-to-the-home coverage, the construction of fiber-to-the-home coverage is undertaken by the developer, and the operator only needs to invest in the cost of main, branch lines and equipment, which saves major home construction costs;
Second, fiber-to-the-home is a passive network, which basically realizes passive power between the user and the central office. Compared with the traditional coaxial line or Category 5 line network structure of radio and television, it saves the electricity cost of community equipment;
Third, the passive optical network has improved the security and anti-interference of the network, and there will be no safety accidents caused by power short-circuit and user-end feedback in the traditional wired HFC network, and there will be no grounding or joint problems. The emergence of electromagnetic and noise interference greatly reduces the usual maintenance costs;
Fourth, the bandwidth is large, the supported protocols are flexible, and services such as two-way and VOD can be directly realized without modification; After the communication operation license is obtained, the full-service operation can be directly realized.
Common faults of fiber to the home
3.1 The ONT terminal has no signal
Fault phenomenon: When the user activates, the ONT terminal has no signal. Analysis of the cause of the failure: one is the problem of the cold connector, and the other is the problem of the optical fiber of the household leather cable. Fault Scope Judgment: It can be preliminarily judged to be problems such as cold splices, home fiber optic cables, and unit optical splitters. Troubleshooting: The first step is to test the optical splitter, and the signal of the optical splitter is normal; the second step, the maintenance personnel test the household leather cable, there is no signal, after redoing the cold connector, there is still no signal, and it is determined as the household leather The optical fiber is damaged during construction; the third step is to replace the optical fiber of the household leather line, the fault is eliminated, and the user business can be opened normally.
3.2 The service under the PON port is blocked
Fault phenomenon: All users under a PON port experience service failure. Analysis of the cause of the failure: First, there is a problem with the backbone fiber, and second, there is a failure in the PON port. Fault range judgment: It can be preliminarily judged that the optical cable is interrupted, the optical splitter is faulty, and the PON port hardware fault is faulty. Troubleshooting: The first step is to use the time domain reflectometer, red light source, etc. to test the main and branch optical cables, all of which are normal, and the faults of the optical cables are eliminated; the second step, after the optical splitter is replaced, the fault has not been eliminated; Step, after the optical module is replaced, the fault is eliminated, and all user services under a PON port are normally opened.
3.3 The ONT cannot be registered
Fault phenomenon: The ONT cannot be registered. After adding the ONT terminal, the installer can observe that the ONT indicator flashes continuously and is in an unstable state. The ONT cannot be registered in the OLT, but other users under the same PON port are in an unstable state. can be registered normally. Fault cause judgment: When a single user fails, the ONT, optical splitter, data configuration, and branch fiber may become the fault point. Check the cause of the fault: The first step is to query the OLT, and the optical power is within the normal value range; the second step is to check whether the hardware is faulty, reset the ONT, and the fault still exists; the third step, check the data configuration, key It is the port data configuration. It is checked that there is a problem with the SN input, and the last digit of the input is wrong. Troubleshooting: After modifying the SN to normal, the fault is eliminated and it returns to normal.
