Application of Transmission Technology in Wired Communication Access Network Engineering

1 Development model and status quo of wired communication access network

1.1 Development Model

The access network refers to all the equipment connected to the user terminal on the backbone network. Under normal circumstances, the composition of my country's public telecommunication network is generally divided into long-distance network, relay network and access network. These three networks have their own division of labor and are closely connected to provide users with power grid information services and complete information transmission tasks. Realize the optimization of communication network structure.

1.2 Development Status

With the continuous development of wired communication technology, its access network structure is also constantly optimized and upgraded, especially in recent years, the wired communication access network technology has become more perfect. In the development of communication technology, wired telecommunication technology has been developing rapidly, especially the application of optical fiber and other media, making wired communication more mature. Although the current wireless communication has completed full coverage, and the transmission method is simple, low investment cost, fast transmission speed and other advantages, the advantages are very obvious in actual specific applications, and there has been a tendency to replace wired communication technology, but in practical applications Among them, because wired communication has the advantages of strong anti-interference ability and safe data transmission, its application value is still very huge, especially for some secret-related institutions and industries, it is even more inseparable from wired communication transmission technology. In the access network application, the most basic methods are divided into fixed telephone access and broadband access. Among them, with the continuous development and improvement of mobile phone technology and the gradual reduction of fixed telephone services, the fixed telephone access method will gradually be eliminated. Direction, this technology has more powerful functions and can meet various needs of users, thereby providing users with more network services.

2 Main types of communication technology transmission

2.1 SDH technology

SDH technology has produced SDH technology because of its own defects. SDH technology is an optical fiber synchronous network, and CCITT named it subsequently. The transmission network built by SDH technology is a kind of network with time synchronization technology and optical fiber technology as the main means. SDH technology forms a variety of network architectures such as chain, star, and ring through the use of business-oriented methods. SDH technology has a standard network protocol. In the SDH protocol, the multiplexing protocol is uniformly defined, which realizes the flexible reuse of mapping, plus the self-healing cycle realized by byte interpolation technology, etc. Technology, SDH technology has replaced PDH technology, and gradually replaced PDH technology, and gradually developed into the mainstream of the entire communication technology.

2.2 MSTP technology

In the process of research and development of MSTP technology, traditional SDH multiplexers, WDM terminals, digital cross-connectors, network switches, etc. are integrated into a network device, and unified management is carried out. On this basis, MSTP technology effectively replaces SDH technology and realizes multi-service transmission. MSTP technology makes full use of the traditional advantages of SDH technology, and transforms it on this basis to realize the support of network services, and can effectively support the data services of Layer 2 and Layer 3. MSTP technology can effectively meet the needs of actual switching services, and can realize interactive services in Ethernet, and realize point-to-point transmission services in the same network, and also realize point-to-multipoint transmission. Based on this MSTP technology in It has been widely used in the access network.

2.3PTN technology

PTN technology is one of the mainstream data information transmission technologies at present. PTN technology is also called MPLS-TP technology. MPLS-TP is a subset of MPLS. It removes the connectionless IP-based forwarding and adds end-to-end OAM function. That is, MPLS-TP=MPLS-IP+OAM. It adopts a hierarchical structure and is divided into management plane, control plane, and data forwarding plane. With the help of PTN technology, it can ensure the stability of data transmission, realize rapid detection and effectively monitor the forwarding status of links in the network, ensure the measurement of network performance, and provide stability for data information transmission. In addition, if the link communication fails, it can quickly help the operator switch to the backup channel to restore the communication quality and ensure the reliability and security of the network.

2.4 ASON technology

ASON technology is a switched optical network with SDH technology as the core. Utilizing the support of the original network unit of SDH technology, it can effectively manage and control the resources of the network dynamically. ASON technology can monitor different services in real time, ensure consistency between different services and applications, and select the best path in a standardized structure to ensure network resource utilization and ensure different bandwidths and services operation, so as to achieve the transmission of the local backbone network.

2.5WDM technology

WDM technology is a technology that can realize various optical carriers in one fiber. Under the same transmission capacity, it can reduce the required fiber optic cable utilization. CWDM technology consists of CWDM color optical modules and multiplexers and demultiplexers, and its network mode is shown in Table 2. WDM technology can be divided into high-density wave multiplexing and coarse wave multiplexing. DWDM technology is the mainstream of current WDM technology, which can realize large-capacity and long-distance transmission. CWDM technology is developed based on the technical innovation of DWDM technology. Compared with DWDM technology, CWDM technology has a simpler architecture and lower system capacity overhead, and is more suitable for use in urban access networks and edge networks.

2.6OTN technology

In order to effectively make up for the disadvantages of SDH technology that cannot adapt to large-grained service transmission, effectively simplify scheduling, and make up for the relatively poor networking capabilities of WDM technology, on the basis of WDM technology and SDH technology, innovatively derived OTN technology means , effectively solve the above problems. The OTN technology is mainly based on the WDM technology and performs network transmission in the optical layer organization. In actual operation, OTN technology can realize huge data capacity transmission, can provide completely transparent data information transmission, and can protect the carrier level. This technology is the most advanced way in the current large-grained service transmission. OTN technology can provide WDM technology with the ability to connect ports to each other, enhance the service protection efficiency of the electrical layer and optical layer, and is gradually applied to the transmission network of the backbone layer and the aggregation layer.

3 Ways to use transmission technology in wired communication access network engineering

3.1 Applied to broadband business group network

In small business clusters, rural postal services are a very common application. Theoretically speaking, postal services in rural areas have relatively low requirements for broadband services, and an E1 can meet the needs of telecom services in rural areas. For such business networking, MSTP technology was often used as a means in the early days, and MSTP gateways were equipped. Then, configure a set of MSTP remote equipment on the user end, combine it with the operator's MSAP central office equipment, and communicate with end users through the MSTP network. The expansion ability of MSAP remote equipment is not strong, but it can provide a variety of interfaces, which can well meet the actual needs of users. In addition, the MSAP central office equipment has a good expansion capability, can be easily connected to the service support network, and can control remote equipment.

3.2 Application in Medium Broadband Service Networking

In practical applications, medium broadband services will be mainly used in the networks of banks and other commercial banks. Since the bank's business outlets generally have computer rooms, the equipment and equipment are relatively good. Early broadband requirements usually do not exceed 100M, and ASON technology and devices can choose such services. In the newly developed ASON equipment, the advantages of optical cables can be used to combine the ASON network with each node in the ASON network. ASON devices have strong scalability, strong stability, and rich interfaces, which can well meet the needs of banking and other industrial enterprises for the stability and security of communication systems. The management system of ASON technology is very complete, has a good network monitoring function, and is easy to maintain later without any investment.

3.3 Application in High Broadband Service Networking

For this type of business, the traditional way is to rent an independent optical fiber network, which can easily lead to poor network carrier-level protection and switching capabilities, and poor security. Carry out network group design with the help of the transmission network of the operation network, and the high-bandwidth business network can generally be applied to the network between the local tax and the national tax. Because the initial demand for this type of service is relatively large, OTN technology equipment will be selected at the access network level, and the nearest access will be realized based on cable resources to ensure the application efficiency of the operator's OTN aggregation layer node equipment. With the help of OTN technology, the interconnection and interaction between national taxation and local taxation, district and county local taxation, and municipal local taxation can be realized, and the current demand for data information transmission can be effectively met. In the process of actual application of OTN technology networking, not only can realize a large amount of information transmission, but also effectively save cable resources, effectively lay the foundation for the telecommunications security of the general public and users, and demonstrate the advantages and convenience of OTN technology to the greatest extent .

3.4 Application in Hybrid Bandwidth Service Networking

Mixed bandwidth is to combine various bandwidths, so that a single internal and external bandwidth can not be achieved. At present, some information technology companies have launched mixed-band hosts, which can directly connect and integrate domestic and foreign frequency bands. In this way, it not only allows users to transmit data between Japan, South Korea, Southeast Asia and other countries. Hong Kong's well-known IDC Xintian Network Company is a company specializing in Hong Kong server and ICT business. It cooperates with 12 network suppliers, including China Telecom, China Mobile, China Unicom, NTT, TeliaCarrier, GTT, PCCW, Telstra, PLDT, Korea KIX and so on. There are many low-latency networks all over the world due to the integration of three networks in my country. The best access route can be selected according to different IP addresses. The 99.99% SLA guarantees local bandwidth, CN2 and Internet connections.

4 Optimizing Strategies for Wired Transmission Technology

4.14.1 Communication equipment optimization

The communication device is an important hardware for network information transmission. In order to improve the quality of wireless transmission, the communication device needs to be improved. According to the development status of the current communication project, the communication facilities have been improved:

(1) According to the actual situation and the actual situation, according to the actual situation of the network, select the appropriate transmission device, because the performance and function of various transmission devices are very different, so in the actual application must strictly abide by the relevant specifications to ensure The equipment can adapt to the communication requirements of the entire network and improve the service quality of the network;

(2) The optimization of peripheral equipment must be carried out, and the network communication device must ensure the operation and stability of the system under certain conditions. Therefore, in the field of communication, the staff must optimize the surrounding environment in order to ensure the stability and function of the system, thereby realizing the optimization of the network;

(3) In the optimal design of equipment, it is necessary to ensure that the optimal design is scientific. On this basis, the influence of various aspects must also be considered comprehensively to ensure the scientific and completeness of the optimal solution. In this process, all kinds of instruments must be carefully considered. When purchasing, they should be compared carefully, and then purchased according to their own requirements to ensure the quality of network communication.

4.2 It is necessary to optimize the transmission line

In the field of communication, the quality of data transmission is an important factor in determining the quality and efficiency of information transmission. Therefore, it is necessary to optimize the configuration of the communication system to ensure the stability and security of the system. At present, cables and cables that can ensure the safety of devices and the operation of communication systems are often used in communication engineering. However, in practical applications, due to the lack of effective equipment and improper line layout, it is difficult to guarantee the quality of network transmission. Serious ground can adversely affect the overall communication quality. Take broadband as an example. In the past, optical fiber was used for home access, but the area was not properly laid out, which made the device settings and wiring methods inconsistent, and because the cable spacing was too large, it would seriously affect the signal transmission and transmission rate. . This problem should be dealt with when laying out the communication lines. At the same time, it is necessary to reasonably design the line to reduce the length of the optical fiber, ensure the stability of the signal and speed up the communication rate. The optimal problem of the communication network is a very complex and systematic problem, so when optimizing, it is necessary to fully consider the surrounding conditions and equipment conditions, and arrange the equipment and lines reasonably, so as to better meet the needs of users.

4.3 Optimizing optical fiber communication transmission technology

In communication engineering, optical fiber is a transmission medium that enables various devices to be connected to each other, thus ensuring the stability and safety of signals.

Optical fiber transmission technology is usually composed of optical fiber, photodetector, light source, etc. It has the advantages of light weight, high transmission rate, strong communication capability, higher security of data information, and long-distance transmission. Certain interference requires further optimization. When laying the optical cable, it is necessary to carry out the construction according to the relevant regulations, and arrange special staff to supervise, to ensure the standardization and standardization of the construction operation, and to prevent the bending of the optical cable line and other problems. In addition, when selecting a suitable material, it is necessary to select a material with better physical characteristics, so as to improve the transmission efficiency and transmission quality of the optical fiber. In order to enhance the anti-interference performance of the optical fiber, a protective cover is added outside the optical cable.

in conclusion

All in all, wired communication is one of the most important modes in the current communication industry. In order to meet the development and progress of the current communication industry, the technical level of wired communication access network should be continuously strengthened to provide better communication services for the masses. Shoulder the goal of stable development of the communication industry, take on more communication services, continuously strengthen the wired communication access network technology, demonstrate its maximum value, and provide users with a better information service platform.