标准摘要
[中文适用范围]： 适用于包括CSDN 和ISDN 终端适配器（符合建议X.30，提供X.21 访问）的环境。 通过指定 CONS 原语和参数与所用协议（X.25 PLP 和 X.21）元素之间的映射来实现规定。 [外文原描述]： Applies to environments including a CSDN and an ISDN terminal adaptor complying with recommendation X.30 which provides an X.21 access. Provision is achieved by specifying the mapping of the CONS primitives and parameters to and from the elements of the protocols used (X.25 PLP and X.21).
英文名称Information technology - Use of X.25 Packet Layer Protocol in conjunction with X.21/X.21 bis to provide the OSI connection-mode Network Service