Digital Switching Network
Digital Telephone Network
Digital Telephone Network DTN
digital telephone switching
digital telephone switching service
packet switching telephone network
public switching telephone network
Telephone Switching Network
telephone switching network of railway
Advanced Digital Network
automatic digital network
automatic digital switching
B-ISDN Broadband – Integrated Services Digital Network
B-ISDN Broadband integrated service digital network
Broadband Integrated Service Digital Network
综合业务数字网
宽带综合业务数字网
宽带整体服务数字网络
Broadband Integrated Services Digital Network
Broadband Integrated Services Digital Network(B-ISDN)
broadband-integrate service digital network