基于嵌入式Linux的SHDSL路由器的设计

Design of SHDSL Router Based on Embedded Linux

本文在分析目前宽带接入方式和市场情况的基础上,以嵌入式Linux为系统软件平台,针对需要对称速率的商业用户,设计了一款基于嵌入式Linux的SHDSL路由器。TC508是一个以DSL线路来承载以太网、E1/V35传输业务的设备。DSL线路采取的承载方式是Ethernet Over G.SHDSL。TC508可以工作在桥接和路由两种模式下。在桥接模式下,以太网业务通过DSL线路直接透传;在路由模式下,以太网业务会解出IP包并路由到DSL线路传输。传输业务中的E1/V35是TDM业务,会被封包成IP包传送,同时会保证其固定的带宽。TDM业务的时钟信息同样会以封包的形式传递到对端。

On the basis of the analysis of the current broadband access equipments and the market, this thesis design a SHDSL router based on embedded linux for the commercial users who need symmetrical speed. TC508 is the equipment carrying Ethernet, E1 / V35 trans mission business with DSL line. The carrier method DSL line takes is Ethernet Over G.S HDSL. TC508 can work in two modes of bridg ing and routing. Ethernet business directly transferred through the DSL line in the mode of bridging. In the mode of routing, IP packets are worked out and routed to DSL line. The E1/V35 of transmission business is TDM business. It will be packeted into IP packet for transmis sion. At the same time it will ensure the fixed bandwidth. Clock information of TDM business will also be transferred to opposite end in the form of packet.