Design And Implementation Of The Software System On The Ethernet Access Switch SW100

Because of the trend that multimedia materials be stored and expressed in digital format, multimedia communication technologies have become a hot-spot in the network communication area. This also results in that several traditional communication networks converge into ONE uniform IP network to provide digital, video and voice services, which has been widely adopted in back-bone networks. But, for Access Networks, several access methods rather than a uniform one are deployed, such xDSL, cable-modem, and Ethernet access technologies. Ethernet access is an absorbing scheme as it adapts to China.In this thesis, we'd like to discuss the design and implementation of the software system on an Ethernet access switch, which is a key component in the Residential Broadband Access System. The software system is made up of several parts, including the embedded Linux OS, the switch's driver software, and some upper level protocol software such as the IGMP Snooping Protocol, the Asymmetric VLAN Management Protocol and the Spanning Tree Protocol. The software system provides the switch with the ability to support each user monopolize lOMbps bandwidth, through which the user can use VoD, VoIP and other digital services, and it also allows the switch to support multicasting, trunk, and traffic isolation.This thesis consists of five parts. The first chapter introduces Ethernet access technologies and requirements for the switches. The second chapter describes the design and functions of swlOO's hardware system. In the third chapter, the detailed design and implementation information of the embedded Linux OS is given. And then, we described the structure and implementation of the switch application related software which runs over the Linux OS. Finally, we discuss how sw100 is used in the Residential Broadband Access System, and conclude this thesis.