整体服务数位网路
zhěng​tǐ​fú​wù​shù​wèi​wǎng​lù

ISDN

整体服务数位网路 整體服務數位網路 zhěng​tǐ​fú​wù​shù​wèi​wǎng​lù
ISDN
Integrated Services Digital Network; a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network