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本文讨论的前提是,接入X.25的用户数据电路是低速率(<19.2k)、低误码率、低延迟的地面线路。 一、基于X.25公用分组网上的IP数据 报传输原理 基于X.25之上的IP层,将X.25三层提供的可靠信道当作一条运送IP数据报的通道,各厂商在X.25三层上开发出来的接口驱动程序,就像一个标准的局域网上的IP接口驱动程序一样,使得X.25网络对IP层来说,就像一个网络的物理实体。也就是说,虽然在X.25互连网络上运行着
The premise of this article is that the user data circuit that accesses X.25 is a low-rate (<19.2k), low bit error rate, low-latency terrestrial line. First, based on X.25 public packet network IP datagram transmission principle Based on the X.25 above the IP layer, the reliable channel provided by the X.25 three-tier as a transport IP datagram channel, the manufacturers in the X. The interface driver developed on Layer 3, just like a standard LAN IP interface driver, makes the X.25 network a physical entity of the network to the IP layer. In other words, though running on the X.25 interconnection network