These years , the use of burst mode data transmission is increasing in digital - communication systems . these systems use point - to - point and point - to - multipoint connections over optical , wireless , and coaxial media 近年来，突发模式的数据传输方式正在越来越多的应用于数字通信系统中，这些系统通过光纤、无线和同轴电缆等媒质实现点到多点的连接。
Based on the support to transmission transparency , the ethernet l2 protocol handling capability needs to be supported , such as point - to - point , point - to - multi - point , shared rings as well as l3 routing function ( mpls and bgp ) 在解决透明传送的基础上，还需要支持以太网技术中二层协议处理能力，如点到点、点到多点、共享环等，以及三层路由功能等（ mplsandbgp ） 。
As a solution for access network , epon ( ethernet passive optical network ) has mature technology and broad application of ethernet . it has a point - to - multipoint architecture and provides multi - service basing on ethernet 以以太网( ethernet )为基础的以太无源光网络( epon )是未来实现宽带、多业务综合接入的重要技术手段,它采用点到多点结构、无源光网络传输,在以太网之上提供多种业务。
The followings are the main contents of this paper : 1 , point - to point and point - to - multipoint communication techniques are studied , and implemented by java multi - thread and tcp socket to support collaborative design in networking environment 总体说来，本文研究的主要研究内容是： 1 ，研究点到点、点到多点的网络通信技术。采用java多线程和tcpsocket技术实现客户机服务器模式下支持协同设计的通信问题。
As a solution for access network , epon ( ethernet passive optical network ) has mature technology and broad application of ethernet . it has a point - to - multipoint architecture and provides multi - service basing on ethernet 以ethernet为基础的epon ( ethernetoverpassiveopticalnetwork ,以太无源光网络)是未来实现宽带、多业务综合接入的重要技术手段,它采用点到多点结构、无源光网络传输,在以太网之上提供多种业务。
Since epon is a multipoint - to - point system , a major feature for this new architecture is the use of a shared transmission media between all users ; hence , medium access control arbitration mechanisms are essential for the successful implementation of epon : ensure a contention - free transmission and provide end users with an equal access to the shared media 由于epon特殊的点到多点的网络拓扑结构,在上行方向各个光网络单元onu ( opticalnetworkunit )共享信道带宽,采用时分多址tdma的方式发送数据,因此需要采用媒体接入控制( mac )协议来协调各个onu的发送,避免上行数据的冲突。
The traditional unicast and broadcast ca n ' t meet the demand of point to multi - points communication for cooperative design , ip multicast is the novel transport protocol to solve this question . it permits that a source in the network once delivers a packet to an arbitrary number of receivers . so it can retrench the network resources and enhance the transmission efficiency 传统的点到点通信和广播通信不能适应协同设计中这种点到多点的通信需求， ip多播正是针对此类问题提出的一种新型网络传输方案，它允许一个ip节点将一个报文一次发送给网络上的一组特定节点，可以节省网络资源，有效提高网络传输效率。
