Analysis of Packet Sending and Receiving by Layer 3 Ethernet Switch CPU

Designing an Ethernet switch that can assure normal interaction of protocol packets between switches in a network environment of massive traffic is an important matter. Taking the L3 Ethernet switch based on Application Specific Integrated Circuit (ASIC) as an example,this article analyzes several typical issues about packet receiving and sending by the CPU in a multi-progress environment,including CPU load,software and hardware queue settings,and communication mechanism between CPU and the switch chip. This article gives solutions to these issues mentioned above. The solutions are applicable to Network Processor (NP) issues as well.

基于西门子开放式工业以太网OPEN IE的数据通讯方案

针对工业网络系统数据通信的现状,提出一种基于西门子开放式工业以太网的解决方案来实现与第三方的TCP连接和ASCII数据交换。介绍了利用S7 PLC和以太网通信处理机CP所构建的系统方案,且给出了比较详细的实施流程,并已有数套成功案例应用于实际生产现场,满足了现场设备层数据通信性能指标和要求,相比标准工业以太网和现场总线而言具有极大的互补性。

浅谈西门子开放式工业以太网OPEN IE通信及其应用

针对工业网络系统数据通信的现状,提出一种基于西门子开放式工业以太网的解决方案来实现与第三方的TCP连接和数据交换。介绍了利用S7PNPLC和以太网CP所构建的系统方案,且给出了具体的实施流程,满足了现场设备层数据通信性能指标和要求,相比标准工业以太网和现场总线而言具有极大的互补性。