Information technology - data communications - x . 25 packet layer protocol for data terminal equipment 信息技术数据通信数据终端设备用x . 25包层协议
2.
Osi information technology - use of x . 25 packet layer protocol to provide the osi connection - mode network service over the telephone network 信息技术.使用x . 25包层协议对电话网络提供开放式系统互连
3.
Osi 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 信息技术.使用x . 25包层协议及x . 21 x . 21二度提供开放式系统互连
4.
Information technology - telecommunications and information exchange between systems - provision of the connection - mode network internal layer service by intermediate systems using iso iec 8208 , the x . 25 packet layer protocol 信息技术.系统间的电信和信息交换.使用iso iec8208 x . 25包层协议通过中间系统提供连接方式网络内层服务
