FTTH is the future "end (terminal), management (network), cloud (application)", architecture access method, is also the access method of the future smart home network center. Therefore, the operation mountain must integrate various factors, reasonably build FTTH, and promote the integration of the three networks.
With the rapid advancement of the integration of the three networks, the continuous emergence of new services and new technologies has greatly accelerated the development process of FTTH. FTTH has quickly entered the stage of scale construction, FTTH construction model, ODN project deployment, rapid service issuance and automatic operation and maintenance , Smart home network and future FTTH technology evolution are all key factors that must be considered; and how to protect users' inherent business usage mode in FTTH mode adopts green and energy-saving power supply backup plan, and how to complete coverage quickly and cost-effectively for home wiring also affects FTTH An important factor in scale construction. For more information, please log in to the electronic enthusiast website (http: //)
1:64 split EPON meets the needs of FTTH construction
Choosing a reasonable splitting mode according to the development needs of China's telecommunications business is a key to FTTH scale construction. The current and future business bandwidth demand analysis of domestic operators is shown in the table.
It can be seen that EPON 1:64 splitting can achieve users' bandwidth access requirements of more than 20M to meet the future demand of 2 channels of high-definition TV, which is consistent with the operator's high-end user bandwidth requirements and planning. And the mainstream splitting mode of FTTH network construction.
The PX20 + / PX20 optical module was used for the 1:64 pilot, which was used in Shanghai Telecom, Suzhou Telecom, Hangzhou Telecom, Huzhou Telecom and other sites (8 unions) to achieve a coverage radius of more than 6KM, achieving good results and fully satisfying EPONFTTH film Scale application conditions.
10GEPON is the mainstream direction in the future
For the future development of FTTH applications, the high bandwidth of 10GEPON can meet the needs of 100M or more per user; 10GEPON supports a large split ratio, which can better meet the development needs of FTTH. At present, 10GEPON has achieved a commercial ratio of 1: 256. Optical modules and other devices support a maximum optical sensitivity of 33.5dB. At the same time, 10GEPON supports long-distance transmission. The test completes 78KM transmission and supports 5km transmission at a 1: 256 split ratio, which can better meet the needs of FTTH construction in domestic cities, suburbs, and rural scenes.
10GEPON is a smooth upgrade product of EPON. EPON and 10GEPON have fully shared the ODN system; high-bandwidth users can smoothly upgrade 10GEPON on demand. 10GEPON and EPON are mixed in the same ODN network. 10GEPON network management operation and maintenance completely inherits the EPON system, and the related support system of the operator does not need to be modified, which greatly protects the investment of the operator.
FTTH operation and maintenance mode
Under the FTTH construction model, the number of ONTs has exploded, and the FTTH operation and maintenance model is a brand-new issue for operators and equipment vendors. How to realize the rapid delivery of business, how to achieve rapid fault diagnosis and troubleshooting are the issues that need to be solved urgently. ZTE and China Telecom have carried out an all-round strategic cooperation, combined with China Telecom to develop PON industry standards, and launched the "3-2-3-1" solution for FTTH rapid service delivery and rapid fault diagnosis and troubleshooting, as shown in Figure 1 .
3 basic tasks
First, improve the construction of the resource management system, including unified planning for FTTHONU devices based on ONU logical identification of LoID, and user VLAN division to form an FTTH resource table. For the line resources including optical fiber line planning, optical cross box and fiber distribution box planning, household line fiber entering the building and entering the house, and fiber connection box planning, a fiber planning resource table is formed. The EMS configuration resource table is formed according to device conditions such as IP address allocation, management channel parameter planning, device configuration principles, and service configuration planning.
The supporting work of the IT support system includes the improvement of the service activation system and the activation system. In particular, the activation system needs to realize all the business activation from the single voice activation to the user.
For the main network with optical fiber, the integrated network management system supporting work needs to increase the optical line detection means, quickly find the fault point and analyze the cause of the fault. The problem can be achieved through the Web and customer service methods.
2 key points
The key point to realize the rapid service issuance and automatic maintenance of FTTH is to use the ONU logical identification LoID. The ONU logical identification authentication LoID is a soft identification, which is planned by the operator and contains network resource information. Compared with the MAC address, this is an irregular hard identification method , More conducive to resource pre-planning and docking with BSS / OSS. LoID is the link between resource management system, automatic activation system, activation system, and maintenance system.
3 fast
Through the transformation of the service distribution process based on LoID, the rapid distribution of services can be achieved, shortening from the previous 2 hours to 20 minutes, greatly improving the user's perception.
By adding a fast detection system for optical lines, ZTE's EasyOpTIcal system can realize rapid fault diagnosis in Zhejiang Telecom and other applications. It can quickly find a solution to the problem through the expert system library and achieve rapid troubleshooting, greatly improving user satisfaction.
1 change
A large number of household ONUs and HGW equipment have been brought about for the scale construction of FTTH. The pressure of the original integrated network management system and service distribution system is huge. ITMS will be the new operation and maintenance center of the family network. It can realize the separation of management on the device side and the terminal side to ensure the safe operation of the entire telecommunications equipment.
Double "1 + 1" mode to solve the problem of home network wiring
The final implementation of broadband services depends on the home network. Based on the problem of indoor wiring, ZTE Corporation proposed a "1 + 1" solution (1 SFU + 1 HGW indoor two-level networking solution), as shown in Figure 2.
SFU is placed in the comprehensive information box at the entrance to solve the problem of difficult indoor fiber wiring; HGW solves the problem of WLAN signal coverage and five types of wiring difficulties. The indoor wiring is flexible and meets any time, anywhere Internet access, video Wait for the realization of business.
In order to promote the commercialization of FTTH faster, combined with the actual business development of China Telecom, thin terminals are an effective means to achieve low cost and fast coverage. For users who do not yet have multiple business needs, the use of 1FE + 1POTS low-cost thin terminals can effectively solve indoor wiring problems and save costs.
Lithium iron battery lifts the worries of FTTH construction equipment
Lithium iron phosphate (LiFePO4) battery is safe, reliable and maintenance-free, can meet the requirement of 2 to 12 hours of power backup, and can be used as a backup power supply for FTTH equipment. For more information, please log in to the electronic enthusiast website (http: //)
By integrating the lithium iron battery in the power adapter, the power adapter has the ability to charge and manage the lithium iron battery in addition to converting AC 220V mains power to DC 12V power, so that the power adapter has backup power capability. When the mains power supply is normal, the mains power supplies power to the ONU equipment, and simultaneously charges the lithium iron battery for energy storage. When the mains power fails, the lithium iron battery discharges power to the ONU equipment to ensure that the ONU equipment works normally and realizes uninterrupted power supply. .
EPON is more suitable for the current scale construction needs of FTTH in China. 10GEPON is the only way for FTTH. Only 10GEPON can meet the needs of FTTH construction with large bandwidth and large split ratio. Using the "3-2-3-1" solution can achieve rapid service delivery, rapid fault diagnosis and troubleshooting.
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