ASON transport network carrying business on demand analysis-ASON, transport networks, business features – Communications Industry
Abstract from a business point of view of the future of the transmission requirements of various business, ASON bearing characteristics of the business and driving business development and so on ASON.
1, bearing demand for voice services
1.1 Fixed voice services Fixed telephone network is characterized by scattered large set of Bureau, Bureau of direct circuit between the opening of more and the end therefore the number of circuit configurations are more and more cross-ring circuit to maintain the inconvenience. In recent years, the slow growth of fixed telephone subscribers, fixed voice business has remained steady trend of growth in fixed telephone services, therefore the bandwidth demand growth slow. Traditional fixed Telephone exchanges Between the switch and the module office / access networks generally use between 2Mbit / s interface to connect, part of the Bureau of Inter-circuit 155 Mbit / s optical / electrical interface connection. A large number of 2Mbit / s and 155Mbit / s SDH circuits commonly used at present to clear the network. Future transmission network over the new technology must also provide interfaces. Traditional fixed line network Network Security Are higher, and transmission technology must provide reliable protection or recovery mechanisms.
Fixed telephone network will transition to NGN. Soft-switching of data between network elements Communicate Format for the IP packet. IP data packets through the IP bearer network load first, and then transmitted by the transmission network. IP bearer network to provide the FE / GE interfaces such as Ethernet, the transmission network must also provide the FE / GE and other Ethernet interface with docking. At present, the soft-switched network transmission solutions are generally added to both ends of the MSTP protocol converter or a way through in the SDH transmission network to maximize the use of existing transmission resources. Carrying IP bearer network is IP-based voice services, network transmission delay, security and other requirements are very high, usually not directly associated with fiber directly transmitted, but by the underlying transmission network to protect and enhance the IP bearer network security.
Fixed long-distance voice and data networks generally carry two kinds of business, and data traffic is much larger than voice traffic, the general IP Multimedia Data bandwidth of about 80% of the total bandwidth. IP multimedia services through general Router Interfaces directly to the wavelength multiplexing do not need the transport layer of protection. But for the exchange of IP bearer networks and 3G networks, the transmission network must be protected, because the voice of the highest security requirements. Thus, with the approach, and 3G subscriber numbers continue to increase, the future of long-distance transmission network is still a large demand on the circuit. Can be seen, the introduction of ASON can meet new bandwidth requirements while integrating the current status of the circuit configuration of chaos and achieve a smooth transition, the transmission network.
1.2 Mobile Voice Bandwidth mobile phone business increased rapidly, the bandwidth demand for mobile telephone network transmission system, accounting for a larger percentage of the total bandwidth requirements. Mobile operators, large-capacity switching system, Bureau of fewer, core network elements within the Board set more concentrated, so the bandwidth needs of new mobile network traffic flows on the transmission network impact of large, thus making ring the efficient use of paragraphs uneven. Between 2G mobile switches, switches, and between the RNC, RNC and the base station generally use 2Mbit / s electrical interface, and 155 Mbit / s optical / electrical interface connection. Currently, a large number of 2 Mbit / s and 155Mbit / s SDH network circuit generally used to clear.
3G voice and data networks are a way to block transmission. IP data packets through the IP bearer network load first, and then transition to the transmission network for transmission. As the IP bearer network will not carry the voice service within the metropolitan area in the traditional hybrid transmission to be established dedicated IP bearer network, the dedicated bearer network must go through the transport layer of protection, the IP bearer network is carrying on top of the transmission network, occupy a certain bandwidth.
Mobile long-distance network and a fixed long-distance network similar to the major load of voice and IP data services. General IP data services directly in the fiber or wavelength transmission, transmission network bandwidth is not occupied, but the voice network and future 3G networks in the IP bearer network must be clear through the transmission network of the circuit to achieve the required security. In the future, mobile long-distance transmission network in exchange for carrying IP bearer network circuit and the future growth of the circuit have a larger space, long-distance transmission network expansion will be very frequent upgrades.
As ASON transport networks have to provide a rich interface, flexible configuration management, and efficient bandwidth utilization, improve the recovery mechanism and a series of advantages, so the introduction of ASON can meet new bandwidth requirements while gradually Changeover circuit carrying the current transmission network, transmission network to achieve a smooth transition.
2, bearing demand for data services
2.1 based data services Although the underlying data network bandwidth is not, but the bearer of the business is very important, so basic data network transport layer security requirements are very high, the current general form SDH ring protection.
Underlying data network to provide a general n × 2 Mbit / s, 2 Mbit / s and the following rates (such as the n × 64kbit / s, etc.) of the circuit interface, the transmission network, the general configuration 2Mbit / s circuit can meet the requirements. Currently used to clear the traditional SDH networks, next to the transition to the ASON transport networks.
2.2 IP Multimedia Services With the popularity of broadband, IP multimedia services developed rapidly. With Internet, the main launch entertainment, video on demand, information browsing, query, download, distance learning, chat and Electronic E-mail and other services.
Local fixed network operators generally higher amount of IP multimedia services, thus building a relatively well-MAN. MAN routers generally the way to take fiber directly connected network, the transmission network does not need to clear the IP multimedia services, of course, a smaller volume of business may also be transmission network load. Future broadband networks becoming more high-capacity metro and scale is also growing, so the general Internet business will not be clear by the transmission network and protection.
IP multimedia fixed long-distance network traffic is high, particularly a large amount of lines of business. Mobile local network IP multimedia traffic is generally small, most of the cities and not the local network IP MAN, IP data services, usually by a small number of SDH transmission network with other business circuit mixed mass. Mobile long-distance network a large amount of IP multimedia services.
Shows IP bearer network operator from the transmission network must be
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