According to DSLForum statistics. As of the end of 2005. The global DSL subscribers reached 138.8 million. There are 20 countries in DSL subscribers has exceeded 1 million. In which China, as the world’s largest DSL user market. The number of users has reached 26.36 million. the world’s DSL subscribers account for about 19% of the total. ranked second in the United States than in more than 700 million.
DSL technology, the most entered the public eye. Is a successful alternative to ADSL to provide narrow-band Modem dial-up business. With DSL technology, innovation and the development of telecom services. DSL becoming more and more end-users and telecommunications network services to connect an important bridge and pass . In addition. More than 130 million worldwide, and is still growing DSL users are providing a great platform for value-added telecommunications services. Current DSL technology and market trends are mainly the following points.
DSL and IPTV technology, and Triple-play business model closely On the one hand the development of IPTV telecom operators can promote the development of broadband access. On the other hand you can increase revenue and reduce customer churn. But also can deal with the challenges from cable operators. For operators. Despite the rapid development of data services. Data services, network traffic has begun to exceed the traditional voice. However, due to the low business unit. Income growth. Can not resolve telecom operators facing the plight of declining ARPU. Telecom operators to offer bundled services include video, including. Be able to increase revenue per user at the same time cultivating the loyalty of customers. Conducive to maintaining the user. Reduce churn.
The development of IPTV business DSL has brought a number of technical challenges. First of all. Video streaming playback quality and provide the transmission bandwidth are closely linked. So, like ADSL2 + or VDSL, etc., to provide more than 10Mbps bandwidth technology is more affected by IPTV operators of all ages. Second. A large number of users simultaneously join a channel on the DSLAM device’s ability to support multicast high demand. In the past. In the Internet access business model, with almost no DSLAM multicast replication function. The new business model DSLAM functionality and performance of the proposed new requirements. And then there are the same time in order to be able to carry IPTV, Internet, voice and other various businesses. Including the DSLAM and DSL equipment, including terminal should have a more powerful QoS control and support capabilities.
The provision of IPTV service from the access network side. Is from the traditional to provide a single, best-effort Internet business into a broadband access network to support multiple operations, with strong ability to Qos guarantee the process of new broadband access network. This process is related to the new DSL access technology selection and network access equipment to upgrade the networking architecture corresponding changes. Is an inherent challenge of a full range of ADSL networks, and enhanced.
Remote terminal management technology has received considerable attention DSL terminal in the past only as a modem devices. Need to manage and configure the parameters much. Existing network running almost all ADSLModem support local Console port or Telnet managed. Minority support HTTP graphical user interface management, and support for SNMP-style management. At the same time. The manufacturers Modem features are quite different. And few of them are features. This makes the existence of all the manufacturers are private MIB, or proprietary configuration management interface.
Relative to the central office DSLAM equipment,. ADSLMODEM are enormous. Users time to vary. With the rapid growth of the number of DSL users. DSL terminal functions are increasingly complex. DSLMODEM the configuration of each parameter varies from a few. As many as dozens. To the global network operators, operating and maintenance has posed a serious challenge to .
Another point is the user terminal equipment ADSL Central Office equipment, conditions need to configure, monitor, maintain and upgrade. The configuration troubleshooting and other management professionals in general need to come to. Costs. Heavy workload. Operators are looking to CPE remote management means to achieve the “on-demand management. On-demand troubleshooting.” ADSL lines in the activation conditions. Through the operator’s equipment management system implementation of the user’s terminal equipment, remote configuration, monitoring, maintenance and upgrade and other functions. to reach the user terminal equipment, remote management and maintenance.
With the 2004 introduction of DSLForumTR-069 specification. Defines how the DSL user terminal through the network for remote maintenance and management of the overall architecture. Then. The country will also put the corresponding industry standards to regulate the specific management protocol and management information. So far. DSLForum has held two for the TR-069 interoperability testing. Once the device management, interoperability issues have been resolved. DSL user terminals with remote management and maintenance functions will be realized.
VDSL2 technology ready VDSL2 is the second generation of VDSL technology. VDSL2 learned the lessons of the first generation of VDSL. From the beginning to determine the use of DMT technology as its line coding techniques. Not as VDSL1 did in QAM and DMT squabbled. It has two main advantages. The first is easy to implement and is now widely used ADSL technology compatibility. To facilitate the network operators from the existing ADSL1/2/2plus smooth evolution to the VDSL2 technology; second VDSL2 technology, both in short-distance the loop to provide a very high rate. also be able to ADSL, as the use of long-distance loop. ADSL to provide similar performance. is a distance-take-all solution. VDSL1, rather than as in the past that will only work in a shorter ring on the road.
The first version of the VDSL2 standard by the end of May 2005 was formally established (ITU-TG.993.2). VDSL2 The main objective is to a distance of 300 meters can reach the top and bottom line of 100Mbps symmetrical transmission and the 1.5 km high-speed 25Mbps download. Its service radius as far as comparable with the current ADSL.
VDSL2 in comparison with the VDSL1. In addition to further improve the performance outside. It also increased the efficiency of the system modulation and anti-pulse interference ability. And define for carrying Ethernet services more efficient way of PTM framing.
With the growing maturity of VDSL2 standard. VDSL2 standard-compliant chips to be soon. Is expected to go through one to two years of technical stable stage. If there is a higher rate of demand driven business. VDSL2 technology is expected to be the next one to obtain attention the success of DSL technology.
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