Digital telephone exchange

美 [ˈdɪdʒɪtl ˈtelɪfoʊn ɪksˈtʃeɪndʒ]英 [ˈdɪdʒɪtl ˈtelɪfəʊn ɪksˈtʃeɪndʒ]

1

After the birth of program-controlled digital telephone exchange , telephone began to have the new class of business functions , such as " call waiting " and " call transfer " . These new functions were considered to be the early intelligent business .

程控数字电话交换机诞生后，开始有了呼叫等待、呼叫转移之类新的业务功能。这些业务功能可以认为是早期的智能化业务。
2

Implementation of Conference Call on Digital Telephone Exchange

交换机电话会议的实现
3

Technical requirements of digital SPC automatic telephone exchange

GB/T15542-1993数字程控自动电话交换机技术要求