电文交换 meaning in Chinese

me age switching
message switching

Message switching network
电文交换网络
Motis . 2 : information technology - text communication - message - oriented text interchange systems - part 2 : overall architecture
信息技术.电文通信.信息定向型电文交换系统
Motis . 3 : information technology - text communication - message - oriented text interchange systems - part 3 : abstract service definition conventions
信息技术.电文通信.信息定向型电文交换系统