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ＩＳＤＮ即综合业务数字网，它是在综合数字电话网（ＩＤＮ）的基础上发展而来的，它使用户端到用户端的传输全部实现数字化。在欧、美等地，ＩＳＤＮ业务早已蓬勃发展，并且其ＩＳＤＮ的应用已达上千种。随着中国电信局开通ＩＳＤＮ业务以来，中国的ＩＳＤＮ应用一下子火...
ISDN, the Integrated Services Digital Network, was developed on the basis of an integrated digital telephone network (IDN) that digitizes all of the user-to-user transmissions. In Europe, the United States and other places, ISDN business has boomed, and its ISDN applications have reached thousands. With the opening of China Telecom’s ISDN business, ISDN applications in China suddenly fire ...