Analysis of broadband metropolitan area Network access technology strategy

The selection of Access layer technology in metropolitan Area Network to a large extent, it determines the construction mode of the broadband IP metropolitan Area Network, this paper tries to analyze the advantages of the two modes by comparing the technology and cost of the LAN and XDSL two kinds of main access modes, and provides the construction strategy for the operators to choose the technology.

Keyword LAN access ADSL broadband IP metropolitan area Network

1 The question of the proposed

At present, the domestic broadband IP metropolitan area Network is in the initial construction stage, the network of broadband information sources and applications are not many, this to a certain extent affect the development of broadband users. And from all over the country's broadband network construction situation, there is a certain window of the general, can learn from the mature and successful operation and construction mode is relatively small. However, in the development strategy, if there is no shaping of the idea will lead to a lot of detours in the future.

Therefore, now in addition to the network operation mode and so on, in front of the telecom operators is a key to what kind of construction ideas, specifically, is to choose the way to access broadband IP users, ADSL, or LAN. This is also a problem that puzzles many local telecom operators. Different answers to this question will lead to differences in the size of the company's construction, investment strategy and operating model, as well as the role and position of the company in the future of the intense broadband IP access market.

Analysis of the development of ADSL and LAN access technology has found that ADSL technology appeared earlier, and more commonly used in foreign countries, while relatively speaking, although LAN technology has a long history, but in the domestic large-scale access to IP users or nearly two years. LAN access can be said to be caused by market competition, many of the lack of basic network facilities of the emerging network operators in order to quickly in the broad future of the IP business market, have to be the fastest and simplest LAN solution to compete with traditional telecom companies. In order to retain users, traditional telecom companies also began to provide LAN access services. There are two main modes of access for broadband IP users in telecom operators. Early in the network construction, out of rapid occupation of the market considerations, and because of the strong money at hand, the operators focus on the scale of efficiency, that is, the network coverage and the number of subscribers as the pursuit of the goal, that is, the so-called "enclosure." It is precisely because of this, but neglected the economic efficiency, the network construction is full of blindness. Often in the project on the horse there is no formal program argumentation and can be developed, not to mention the return of investment life. In addition to attract users to adopt preferential policies, resulting in a very slow capital withdrawals, and the lack of a viable online profit model, a few years down, most operators to make ends meet, the initiative to withdraw.

The withdrawal of rivals has led to a seemingly tasteless LAN access in the hands of traditional telecoms companies. So for the traditional telecoms companies, whether to follow the exit, or continue to insist?

2 Technical comparison

To delve into LAN access and ADSL technology, it is not difficult to find their own technical characteristics.

For traditional telecoms companies, the use of ADSL technology to access broadband IP users is obviously more rapid and economic, single user cost is low, and the line investment is very small, the user's opening only need to purchase and install the client equipment can be, and the commitment to the QoS to establish a good brand, has a strong regulatory nature. Through the combination of billing system, ADSL access users can be based on traffic or time long billing, you can do better user management, different users to grant different permissions, so that the company flexible to carry out a variety of business design. But the current restrictions on the development of domestic ADSL is also very obvious: 1) a large one-time investment, the user needs to add modem equipment (may have voice separation equipment), the price is around the thousand yuan, and the current price of the mainstream PC is about 5000 yuan, relative to this part of the investment is relatively large, and if the use of leasing methods, According to the two-year lease after the calculation, the cost to users will be higher; 2 the current ADSL laboratory test effect is good, but in fact, because the traditional telecommunications company's users of copper cables have a certain year, affecting the opening of ADSL business. The actual user rate and distance are limited, more critical is the impact of ADSL output rate. And with the advent of g.lite products, this effect will be more obvious. In this way, in the user's high demand for the community, it is difficult to meet demand.

For other operators, because there is no household copper resources, it will be difficult to use ADSL way to access broadband IP users. Therefore, with the construction of its broadband man, it is more practical to access users in LAN mode. LAN access mode for users, less input, easy to use, and for the community operators, with real estate projects to pave the 5-class line is very simple, early business development is very fast, investment is relatively small. But the disadvantage of LAN access is also very obvious: 1 network manageability is poor. The user's rights management is very difficult, usually only in a monthly subscription system, while the user traffic and access to the control of the length of time (need additional equipment or transform switch equipment); 2 The network security is poor. The way Ethernet broadcasts work leads to a lack of isolation among users, and user information security issues and broadcast storm problems can occur frequently. These two key issues lead to a wide range of deficiencies in the way LAN access is provided by the service, far from the telecom carrier level requirements, it is necessary to increase the functional modules on the Ethernet equipment or select new equipment to achieve the level of operation, 3 of the existing residential areas of the rewiring cost is higher.

3 Construction development Strategy

Through the above comparison, it is not difficult to find, generalize to say ADSL good, or LAN superior are inaccurate.

For different periods, different stages of development, different backgrounds of operators, different environments, will adopt the corresponding development strategy, these two technologies have their own suitable range of application, should be targeted according to the actual situation to choose to use. Therefore, different operators should adopt different technical strategies.