摘要
China’s booming national economy is bringing about rapid development of telecommunication. In response to the increasing demand, the Qingdao AT&T Telecommunication Equipment Service Co., Ltd. has developed the latest products—the 5ESS—2000 series general digital program-controlled exchanger of the AT&T Corporation, USA. It is a supertelecommunication digital PC exchange platform, a telecommunication network of the 21st century and the most advanced digital PC exchange equipment. The Qingdao AT&T Telecommunication Equipment Service Co., Ltd., was founded by
