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继线路交换、信息交换之后,六十年代中期,义开始形成了一种新的交换方式一分组交换,分组交换也可以称作信包交换。分组交换的整个工作过程都依赖于通信规约,而不是仅仅在呼叫建立和拆除时才使用规约,这是分组交换区别于线路交换的最重要的特点。同时,线路交换是含透明网,一旦路由沟通,交换网从功能上只等效于用户终端之间的一对连线,但分组交换面向事务处理,一次只在网内传送一个信包,两个方向的线路可以是相互独立的。
Following the line exchange and information exchange, since the mid-1960s, Yi started to form a new exchange mode, packet switching. Packet switching can also be called packet switching. The whole working process of packet switching relies on the communication protocol instead of using the protocol only for call set-up and tear-down, which is the most important feature that distinguishes packet switching from wire-based switching. At the same time, the line exchange is a transparent network. Once the route is communicated, the exchange network is functionally equivalent to a pair of connections between user terminals. However, the packet exchange is transaction-oriented, and only one envelope is transmitted in the network at a time. The direction of the lines can be independent of each other.