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随着通信技术的日益发展,通信网已经经历了电话综合业务数字网(IDN),综合业务数字网(ISDN)和窄带综合业务数字网(N-ISDN)发展阶段,目前正向宽带综合业务数字网(B-ISDN)发展。 综合业务数字网是一种在电话数字网的基础上发展起来的能提供用户间端对端的数字连接,并同时承
With the development of communication technology, the communication network has gone through the stages of development of the integrated services digital network (IDN), integrated services digital network (ISDN) and narrowband integrated services digital network (N-ISDN), and is now moving towards the development of broadband integrated services digital Network (B-ISDN) development. Integrated Services Digital Network is a digital network developed on the basis of the phone users can provide end-to-end digital connection, and at the same time