Star type local area network by high capacity packet switching

局域网是其中要执行包括计算机通信的增强通信的通信网络。对于局域网，人们已经提出了各种方案。用于局域网的交换原理分为报头驱动原理和预置原理。在预置系统中，在通信之前建立通信链路，并使用这样建立的线路传输信号。在报头驱动系统中，信息的目的地由信息的报头决定。这种方案通常被称为分组交换。由于重新交换的耗时性质，预置系统不适合多进程计算机通信。磁头驱动系统又分为储存型和无储存型。在存储类型中，由于切换点的存储，交换机的容量是有限的。在传统的无存储类型的局域网系统中，系统只使用一种传输介质。因此，一次只能进行一次传输。另一方面，在预置系统中，使用多个连接可以实现多个同时传输，在本研究项目中，提出了一种基于报头驱动的无存储原理的具有同时传输能力的新的交换系统。多个节点通过星型配置连接，中心交换报文。交换中心包括多条交换路径，这些交换路径根据报头来路由输入信息。该网络还包括用于处理确认的反向单独路径。该报告描述了交换系统的实验评估。

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.