Star type local area network by high capacity packet switching

局域网是一种通信网络，在其中进行包括计算机通信在内的增强通信。针对局域网已经提出了多种方案。用于局域网的交换原理分为报头驱动原理和预置原理。在预设置系统中，在通信之前先建立通信链路，并通过这样设置的线路传输信号。在报头驱动系统中，信息的目的地由信息的报头决定。这种方案通常称为分组交换。预设置系统由于切换费时，不适合多进程计算机通信。磁头驱动系统进一步分为存储型和无存储型。在存储类型中，由于开关点的存储，开关的容量受到限制。因此，在许多局域网系统中采用无存储类型。在传统的无存储型局域网系统中，系统中只使用一种传输介质。因此，一次只能传播一次。另一方面，在预设置系统中，可以使用多个连接进行多个同时传输。在本课题中，提出了一种基于报头驱动无存储原理的具有同步传输能力的新型交换系统。许多节点通过星型配置连接，中心交换数据包。交换中心包括若干交换路径，这些交换路径基于所述报头路由所述传入信息。该网络还包括单独的反向路径来处理确认。该报告描述了开关系统的实验评估。

Local area network is a communication network in which enhanced communication including computer communication is to be performed. A variety of schemes has been proposed for LAN. Switching principle used for LAN is classified into header driven principle and preset-up principle. In preset-up system, communication link is established before communication and signals are transmitted using the line thus set up. In header driven system, destination of the information is decided by the header of the information. This scheme is generally called packet switching.Preset-up system is not suited for multi-process computer communication because of the time consuming nature of reswitching. Head driven system is further classified into storage and storageless types. In the storage type, the capacity of the switch is limitted because of storage at the switching point. Therefore storageless type is used in many LAN systems.In conventional storageless type LAN systems, only one transmission media is used in the system. Therefore only one transmission is possible at a time. On the other hand in preset-up system, a number of simultaneous transmission is possible using a number of connections.In this research project, a new switching system by header driven storageless principle is proposed having simultaneous transmission capability. A number of nodes are connected by star type configuration and the center switches the packet. The switching center includes a number of switching paths which route the incoming informations based on the header. The network also includes separate path of reverse direction to handle acknowledge. The report describes the experimental evaluation of the switching system.