Analyze common problems of broadband MAN access

This article analyzes frequently asked questions about broadband MAN access. There are many areas worth learning about in broadband MAN access. Here we mainly introduce the use of broadband MAN access to shared Internet, this section describes knowledge points such as broadband MAN access, security, and TCP/IP network protocols.

Question proposal

At present, all domestic broadband ip man networks are in the initial construction phase, and there are not many broadband information sources and applications on the Internet, which affects the development of broadband users to a certain extent. However, from the perspective of the broadband network construction in various regions across the country, there is a general window, and there are few mature and successful operation and construction modes that can be used for reference. However, if there is no idea in the development strategy, it will lead to many detours in the future.

Therefore, in addition to the network operation model and other issues, a key issue for telecom operators is what kind of construction ideas should be adopted. Specifically, what method should be used to access broadband IP users, whether it is ADSL or LAN. This is also confusing for many local telecom operators. Different answers to this question will lead to the difference in the company's construction scale, investment strategy and operation model, it also determines the role and position of the company in the fierce broadband MAN access market in the future.

By analyzing the development history of ADSL and LAN access technology, we found that ADSL technology was adopted earlier and is widely used abroad. However, although the LAN technology has a long history, however, in China, large-scale broadband MAN access for IP users has been around for nearly two years.

LAN access can be said to be caused by market competition. A large number of emerging network operators that lack infrastructure have a share of the future of the IP business market, we had to compete with traditional telecom companies with the simplest LAN Solution. Traditional telecom companies also begin to provide LAN Access Services to retain users.

As a result, there are two main broadband MAN access methods for telecom operators. In the initial stage of network construction, due to the rapid occupation of the market, and the abundant funds at hand, operators mainly consider economies of scale, that is, the target is the network coverage and the number of contracted users, that is, the so-called "Enclosure ".

It is because of this that economic benefits are neglected, and network construction is full of blindness. there is often no formal solution demonstration and feasibility study report when the project is launched, not to mention the return period of investment. In addition, the preferential policies adopted to attract users lead to slow capital return.

In addition, there is a lack of a feasible online profit model. In a few years, most operators have to take the initiative to exit because they do not make enough money. As competitors exit, LAN access in the hands of traditional telecom companies seems to be a weakness. So does a traditional telecom company continue to stick to it?

Technical Comparison

It is not difficult to find out the technical characteristics of LAN access and ADSL. For traditional telecom companies, the use of ADSL technology to access broadband IP users is obviously more rapid and economic, with a low cost for individual users and very few line investment, the user's activation only requires the purchase and installation of the User-end device, and the QoS commitment can establish a good brand with strong manageability.

Through the coordination of the billing system, users connected to ADSL can be billed based on traffic or duration, which can be used for better user management and grant different permissions to different users, this allows the company to flexibly design various businesses. However, the factors limiting the development of ADSL in China are also obvious:

First, there is a large one-time investment. the user needs to add a Modem device that may have a voice Separation Device). The price is around RMB five thousand, and the current price of mainstream PCS is around RMB, relatively speaking, this part of the investment is relatively large. If the leasing method is adopted, the cost will be higher for users after the two-year lease period.

Second, the current test results of ADSL are good, but in fact, because traditional telecom companies have been using copper for a certain period of time, affecting the activation of ADSL Services. The actual user rate and distance are limited, and more importantly, the ADSL outbound rate is affected. With the emergence of G. lite products, this effect will become more obvious. In this way, it is difficult to meet the needs of communities with high user demand.

For other operators, it is difficult for them to access broadband IP users through ADSL because they do not have the copper cable resources in their hands. Therefore, in combination with the broadband MAN construction, it is more practical to access users through LAN. LAN access is easy to use for users. For residential operators, it is very easy to lay 5 types of lines for real estate projects, and the initial business development is very fast, investment is also relatively small.

However, the disadvantages of the LAN access method are also obvious. First, the network has poor manageability. It is very difficult to manage user permissions. Generally, users can only pay by monthly subscription. However, it is difficult to control user traffic and access duration by attaching devices or modifying devices ). Second, poor network performance. The work of Ethernet broadcasting leads to insufficient isolation between users. User information problems and broadcast storms often occur.

These two key problems cause many defects in the services provided by the LAN access method, which far fall short of the requirements of telecom operators. Therefore, you must add a function module or select a new type of device to an Ethernet device to achieve operational level. In addition, the cost of re-wiring existing residential areas is relatively high.

Construction and Development Strategies

Through the comparison above, it is not difficult to find that, in a general sense, ADSL is good, or LAN is not accurate. Corresponding development strategies will be adopted for carriers of different periods, different development stages, different backgrounds, and different environments. These two technologies have their respective application scopes and should be selected based on the actual situation. Therefore, different operators should adopt different technical strategies.

Traditional Telecom Operators should subdivide user groups and adopt different broadband MAN Access Technologies for different user groups and different business needs on the premise of understanding the market conditions in detail. For residential areas with a relatively intensive bandwidth user base of more than 5% in the initial phase, and the actual installation rate may reach more than 20% in the future), set a broadband Metropolitan Area Network Access Node in the residential area, provides users with LAN broadband MAN access services;

In the high-end Xinxing community, collaborating with real estate agents to develop LAN access users. For residential areas with relatively scattered broadband users, the actual installation rate is less than 5% in the initial phase, and the actual installation rate is less than 20% in the future, ADSL should be used as much as possible to achieve access to broadband IP users; broadband MAN access nodes should be set up in high-end office buildings to provide LAN access services; ADSL Services should be promoted to individual enterprise users, from 512 kbit/s ~ 2 Mbit/s access service;

For enterprise group users, LAN Access Services Based on man VLAN are implemented to achieve internal enterprise networking. For broadband MAN access in remote counties, due to the single DSLAM interface standard, therefore, for remote terminals with low potential user density, the OUN + DSLAM method should not be used, while the hybrid transmission device + DSLAM board should be used for low density ), map the DSLAM back ports with N × E1 ports to provide the ADSL access service.

Emerging telecom carriers lack telephone access network resources. Therefore, the broadband MAN access market mainly uses LAN access methods to develop users, and should be based on "Stronger" rather than "bigger ". Economic benefits should be fully taken into account when local broadband IP services are carried out. They can work with real estate agents to integrate cabling with the implementation of new real estate projects and use LAN to access users;

Strive to occupy high-end residential quarters, improve the actual installation rate of residential buildings; occupy high-end office buildings, develop company users; develop enterprise group users, and carry out LAN Access Services bundled with IPVPN; the current actual installation rate is not high, however, in the future, residential areas that may have potential for development will introduce broadband MAN access devices, but will not develop users for the time being. They will choose to abandon the low-end market.