What Is an Access Network?

With the rapid development of communication technology, telecommunications services are developing towards integration, digitization, intelligence, broadband, and personalization. The demand for diversification of telecommunications services is also increasing. The increasing maturity and use of (PON) and DWDM technologies have laid the foundation for the realization of "three-line integration, first-line home access" in voice, data and images. How to make full use of the existing network resources to increase business types and improve service quality has become a topic of increasing concern for telecommunications experts and operators. The "last mile" solution is the focus of everyone's attention. Therefore, the access network has become a hotspot for network applications and construction.

Access Network

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With the rapid development of communication technology,

The so-called access network is

according to

The core of the access network concept is to divide the entire telecommunications wide area network into three parts: the core network, the access network, and the customer premises network. The access network and the core network form the telecommunications public network. The access network is

According to the access network framework and institutional requirements, the important characteristics of the access network can be summarized as follows:

1. The access network provides bearer capability for the accessed services, and realizes transparent transmission of services.

2. The access network is transparent to user signaling. Except for some user signaling format conversions, signaling and service processing functions are still in the service node.

3 The introduction of the access network should not restrict the existing access types and services. The access network should be connected to the service nodes through a limited standardized interface.

4 The access network is independent of the service nodes.

1. It has multiplexing, cross-connect, and transmission functions, and generally does not have switching functions. It provides an open V5 standard interface and can be connected to any kind of switching equipment.

2. The access network supports a variety of services, but has a lower service density than the core network.

3. The operating conditions are not high. Compared with the core network equipment generally placed in the equipment room, the access network equipment is usually placed outdoors. Therefore, the performance, temperature adaptability and reliability of the equipment are very high.

4. The networking ability is strong, and the access network has multiple networking forms.

5. Multiple access technologies can be used, copper wire access, fiber optic access, fiber optic copper shaft hybrid access, wireless access, etc.

6. Comprehensive network management functions, in addition to connecting to the TMN through the Q3 interface, can also access the local network management system through related protocols, which is managed by the local network management center.

7. The access network covers a wide area. The access node covers the whole country, and all places where the phone accesses can access the Internet.

(1) Bus-shaped structure. It refers to the use of optical fiber as a common bus, and

Since the development of the communication network, drastic changes have taken place, from analog to digital, from cable to

The traditional access network mainly provides users with general voice services and a small amount of data services in the form of copper cables. With the development of society and economy, people's demand for various new services, especially broadband integrated services, is increasing day by day. A series of new access network technologies have emerged at the historic moment, including the widely used copper based on existing twisted pair cables. New cable technology,

Inevitable requirements for business development

· User demand for new broadband services

· Promotion and application of SDH and ATM technology on the main line

Require access network to provide a broadband transmission channel

· Copper cable users have a small network capacity and a narrow frequency band, making it difficult to expand and digitize

Has become a bottleneck in the realization of telecommunications networks

· The development direction of telecommunications business is

With the disappearance of the monopoly market in the telecommunications industry and the opening of the telecommunications network business market, the telecommunication business functions and access technologies have continued to improve, and access networks have also been accompanied by development, mainly reflected in the following points:

(1) The complexity of the access network is increasing . The competition and comprehensive use of different access technologies, as well as the support for a large number of telecommunication services, have increased the complexity of the access network.

(2) The service range of the access network is expanding. With the development of communication technology and communication network, the capacity of local exchanges is constantly expanding, and the number of exchanges is decreasing. In places with small capacity, hubs and multiplexers are used, which makes the service range of the access network constantly expand.

(3) The standardization of access networks is increasing. After the local exchange office gradually adopts the open interface based on the V5.X standard, telecommunication operators are more free to choose the access network technology and system equipment.

(4) The access network should support higher-level services. The development of the market economy has prompted commercial and corporate customers to demand larger capacity access lines for data applications, especially

Services supported by the access network

Voice services: Program-controlled telephone new services, magnetic card telephone services, etc.

Data services: DDN services, packet switching services, etc.

· Image communication business: conference TV business, video phone business, etc.

Multimedia business: home office, shopping, VOD, telemedicine, etc.