Explanation of complex Internet access problems

China's communication industry is developing rapidly, with more and more market demands. At the same time, many Internet access technologies and methods have emerged, here we will introduce you to the discussion about data bypass in the access technology. Currently, Internet access is divided into two types: broadband access and narrowband dial-up access. For broadband access, there are two main methods: ADSL access based on existing copper access networks and direct data access based on optical fiber networks. Obviously, because of the new technologies introduced in these broadband access methods, the telephone network can be well bypassed. However, for narrowband dial-up access, because the commonly used analog Modem is still a telephone technology, it is difficult to bypass this type of "Internet phone" from the telephone network. With its wide coverage and comprehensive popularity of users, and low cost, the telephone network makes narrowband dial-up access the most important Internet access method for Internet businesses. Therefore, operators or some potential carriers attach great importance to the bypass Technology of Internet dial-up access, and manufacturers will invest heavily in this field.

The original intention of the telephone network is to serve the traditional telephone business. It only transmits voice, that is, telephone users. Generally, the call lasts for a short period of time, with an average of 3 ~ 5 minutes, focus on call processing; but with the improvement of communication technology, various new businesses are emerging, and the business positioning of the telephone network has gradually changed. In particular, the emergence of the Internet has had a profound impact on the telephone network, mainly manifested in two aspects: first, as an extension of the Internet, the telephone network is able to get rid of the original voice services and start to try some non-phone services, thus expanding the business scope to a certain extent; second, the impact of Internet access on the telephone network itself. The development of multimedia services will inevitably allow more and more users to connect to the Internet through the telephone network, and the communication time will also grow. The average access time is 27 minutes, but the traffic volume is small. All of this will make the network load heavier and heavier, and impede the normal communication of the PSTN.

Therefore, with the continuous development of Internet access services, corresponding measures must be taken to solve the conflicts between the two business development and ensure the coordinated development of the two. Currently, the best way to solve this problem is to achieve data bypass, that is to say, a large number of Internet connections in this bureau are handled by the access unit of a multi-business access switch or an independent multi-business access switch system, the data streams connected to the Internet are directly transmitted to Internet public networks or remote ISPs through the grouped data network line, instead of the relay line through the telephone network, thus avoiding occupying a large amount of relay resources for a long time, this reduces the stress on the telephone network trunk line. To this end, a variety of bypass technologies have been put forward at home and abroad, and have gone through the development process of rear bypass, front bypass and built-in bypass.

The rear bypass technology sets the bypass point between the local communications Bureau or the International Communications Bureau and the data Bureau. In this structure, internet calls are routed to the data network after they are switched through a population-level switch. The advantage of this structure is that when the technology is applied to the local communication, it solves the problem of inter-office relay and egress switch congestion. However, the entry-level switch still contains the transmission and dispatch process of Internet calls. This technology was adopted earlier, but in fact it did not play a real bypass function. When a large number of dial-up Internet businesses access, it did not really solve the problem of telecommunication network congestion, in addition, there are many defects such as large investment during construction. Therefore, it hinders the development of Internet services.

With the emergence of broadband access technology, people have proposed the pre-bypass technology, that is, the bypass point is located between the user line to the user module of the switch. This technology is suitable for broadband access, but it is not widely concerned about narrowband access, because in this structure, although Internet calls are bypassed on some user lines between entry-level switches, all network element entry-level switches, relay lines, and egress-level switches in the PSTN are no longer responsible for the transmission of Internet call streams, the Internet dial-up service can be isolated from the telecom network. However, the entry-level switch is still responsible for some of the relevant signaling processing of Internet calls, in addition, it is required that the front-end devices work together with the entry-level switches, such as the Crown analysis and link distribution. A complicated mechanism is required to ensure that the existing switch technology cannot be supported ), therefore, it is difficult to implement in the network. No manufacturers or carriers have yet to adopt the service.

Both the pre-bypass and post-bypass must change the existing telecom network structure more or less and cannot be perfect. Therefore, the built-in bypass technology is gradually proposed, that is, the bypass point is located in the user module of the switch or the inbound relay module) and the switching network. In this structure, Internet calls are bypassed after the user circuit of the entry-level switch, the exchange network, trunk lines, and egress Switches of entry-level switches in the PSTN are no longer responsible for the transmission of Internet call streams. Although the entry-level switch is still responsible for the transmission of Internet call streams. Although the entry-level switching machine is still responsible for handling part of the relevant signaling of Internet calls, the difference between the front-end bypass is that because the bypass point is located inside the switch, there is no longer a complex coordination mechanism between the bypass equipment and the switch, and the switch can use its internal capabilities, so that the switch will not be technically changed, so that the built-in bypass becomes a very attractive solution to the Internet bypass problem.

The above is a technical introduction to the data bypass of operators. Next we will discuss the implementation of Internet Data bypass Technology in large and medium-sized enterprise networks based on the Quidway A8010 EXPERT Multi-Service Switch of Huawei equipment. The main difference between GPON enterprise networks including voice networks and data networks) and operator networks is that traditional voice networks of operators include terminals, level 1 Communications bureaus, and level 2 communications bureaus; an enterprise's network is divided into centers for exchange, branches, bearer scheduling, production, command, and other application services. Some enterprises do not even have their own voice switches, instead, it uses the relay group solution provided by the carrier. If you can integrate data services into existing traditional telephone networks, you can use existing devices to the maximum extent to save costs. The Quidway A8010 EXPERT Multi-Service Switch of Huawei can be used to implement multiple services. This section only describes the implementation of CEN data bypass on A8010.

For an enterprise network, Internet Data Access users do not account for too many users. In addition, it is recommended to bypass data on a central switch based on the user's cost; if it is not a cross-region enterprise, it is unrealistic and unnecessary to implement data bypass on the branches. For branch offices in regions with few Internet access users, it uses the method of allocating relay to the enterprise exchange center to connect No. 7 signaling to multiple service Internet access switches through the Central Bureau ). Because there are few Internet access users in these regions, it will not impact the voice services of traditional telephone networks.

For branches in regions with Concentrated Internet access users and a large number of users, the direct circuit is deployed with up to service access switches, that is, the SDH Transmission Network or its transmission network is used) directly allocates n 2 m circuits to multiple business access switches in the enterprise Exchange Center. The branches can be C & C08 machines or switches of other manufacturers. Quidway (R) A8010 EXPERT inherits the well-compatible Signaling System of C & C08 type B and can be well connected with switches of other manufacturers. GPON from the above point of view, the CEN A8010 Multi-Service Switch has a relatively simple networking, and its position is at the edge of the voice network and data network, it can easily implement the business functions of the voice gateway or data gateway or both.

Here we will introduce the popular data bypass technology-S12 data bypass. At present, the development trend of the telecom network is that the S12 narrowband switching network DSN is replaced with the broadband network GSN. People familiar with S12 know that AS is the entry level of the S12 switching network, it is also a 512x512 non-congestion switching array. It has 16 ports. In addition to four ports connected to four planes in the S12 DSN selected group, the other 12 ports can connect to the user module, relay module, and various control modules. Due to design considerations, currently, only 8-10 modules are connected to these 12 ports in S12 of CEN, that is, two or four of them are standby, it can be used to connect the relay circuit of the dial-up server.

The advantage of this technology is that S12's own capabilities can be used without changing the telecom network structure or changing the existing switch while fully utilizing existing telecommunication network resources, the system completely solves the congestion problem of the telecom network. In addition, the system can also provide regular online services for 5%-15% of users in S12 local communication bureaus during End-level user bypass, this makes it possible for the telecom department to package monthly fee for Internet users. This not only increases revenue for the operation department, but also facilitates Internet users and reduces Internet access fees, this can further lead to the Internet boom of Chinese users and promote the development of the information industry.

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