The third generation ADSL dedicated line access solution

As a good solution to the Internet Access Service, ADSL technology has not been able to be used in the Special Line access service because of the limitation of the traditional Adsldslam in the technical aspect in its early development. The application of the first and second generation Adsldslam limits the application of ADSL technology greatly. Therefore, the third generation of solutions emerged. ——— Editor

The first generation of pure ATM structure Adsldslam from downlink line to uplink interface all using ATM, and ATM network interface development So far still only can provide 622M interface, Exchange capacity is usually only a few GB, thus in the exchange capacity of the first generation of Adsldslam is greatly limited. In addition, the first generation of Adsldslam in the construction needs to occupy a large number of ATM network resources, coupled with higher cost of ATM equipment itself, also directly led to the high cost of comprehensive construction, so the first generation of Adsldslam in the Access Service has not been widely used.

The second generation of Adsldslam, based on the dslam of the original ATM kernel, provides IP uplink via protocol conversion, thus solving the weakness of the first generation Adsldslam completely dependent on ATM network. However, the second generation of Adsldslam can only be regarded as a transitional product, and its structural characteristics cause the equipment to consume a large amount of resources in the ATM and IP conversion. At the same time, because the conversion of ATM and IP is centralized in the Uplink interface board, this makes the uplink interface a bottleneck. In addition, the second generation Adsldslam follows the ATM kernel, which is cascaded through the ATM internal bus using a dedicated cable. Because in the implementation of cascading data flow will be greater, so the upstream bottleneck is more serious, which makes the network expansion is very difficult. Moreover, the second generation Adsldslam can only support a small amount of 802 because of the ATM kernel. 1QVLAN, generally not more than 32, and therefore can not make each PVC and VLAN one by one mapping, it is difficult to guarantee the QoS of dedicated line users.

Based on the experience of the first generation of pure ATM architecture and the Adsldslam of the second generation ATM core IP uplink, the port network has adopted the Advanced Pure Ethernet technology kernel in the design of Hammer10000ipdslam third generation broadband IP access switch, The use of patented technology in the ADSL interface board to completely end the ATM characteristics, with up to 30G of backplane bandwidth and full speed L2/L3 exchange capabilities, to ensure that all ports have wire speed forwarding capability, thus greatly improving the application of ADSL technology adaptability.

The Hammer10000ipdslam upstream interface supports FE, GE, and POS interfaces with up to 4GE simultaneous uplink. Even in the case of 448-line ADSL can still do without convergence of the full speed/downlink, fundamentally ensure that the enterprise-class customers need for high network bandwidth. And the Hammer10000ipdslam uses the leading intelligent flow processing technology, can handle 12 simultaneously. 80,000 user data flow, and can be for each ADSL line to achieve 32kbps as the unit of the uplink and downlink bandwidth control, in a variety of packet length, bandwidth control error of not more than 5%, greatly improve the IP network service quality.