The Design And Realization Of High-speed Multi-service Ip-dslam

As the IP Network prevails nowadays, IP network will replace the ATM network steadily, and take over the world of communication, thus many networking devices are developed from merely support ATM network to IP network. In broadband access layer, this trend asserts itself by the fact that ATM-DSLAM being replaced with IP based IP-DSLAM. IP-DSLAM becomes the main broadband access device time being in that it is more advantage over ATM-DSLAM in terms of Access Bandwidth, Extensibility and Cost Effective. However, IP-DSLAM inherits the inherent drawback of IP network—bad QoS (Quality of Service) performance—which is very vital when applies to Triple Play services. As a result, how to design an IP-DSLAM with elegant QoS future would be a rough issue. What's more, as the number of broadband user increased and various kinks of network services emerged, developing larger bandwidth available IP-DSLAM becomes another risk and challenge.Whether one kind of IP-DSLAM is more competitive depends on its broadband access capability and QoS implementation. This page will tell how to design, develop and evaluate a high-speed packet switched and delicate QoS implemented IP-DSLAM which supports more user connection with high bandwidth and behaves fine QoS. As for the high-speed access capability design, the page describes its designing scheme from hardware level to software level. In the hardware level, 1000Mbps to backbone and 10Gbps uplink are used to increase the broadband access capacity and packet switch ability; and in the software level, ameliorated software processes and algorithms are adopted to fasten the response speed of the device. And with regard to supporting multi-services, the page presents a DiffServ QoS implementation, which includes QoS marker for different FEC (Forwarding Equivalence Class), optimized queue scheduling algorithm, congestion avoidance and traffic policing, all of which are instrumental for Triple Play services in convergent networks.At last, the page systematically tested and evaluated the high-speed access profile and QoS performance of the IP-DSLAM which adopts the methods aforementioned, and got a desired testing data which further proves the schemes of the page to be practical. What's more, this kind of IP-DSLAM appears nice evaluation performance under the testing of China Network Communications Corporation at March, 2006. Currently, this kind of IP-DSLAM is in commercial usage.