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X.25是数据终端设备和各种包交换网之间的接口建议书。它是1976年被采纳的。1976～80这段研究期间内,其内容大大扩充了,并且引入了许多新的用户设施,但仍和从前的文本保持着向上兼容性。本文着重讨论1980年2月采用的、并已被普遍接受的X.25中的各种技术问题。
X.25 is an interface proposal between data terminal equipment and various packet switching networks. It was adopted in 1976. During the 1976-1980 period, its content was greatly expanded and many new user facilities were introduced, but up-front compatibility was still maintained with previous texts. This article focuses on the various technical issues that were adopted in February 1980 and are generally accepted as X.25.