Luyện thi THPT QG 2018Tín hiệu trong các mạng viễn thông P7
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Tín hiệu trong các mạng viễn thông P7
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CCITI’ began the specification of the second-generation common-channel signaling system, known as signaling system No.7 (SS7), in the mid-1970s. The system was developed initially for telephony call control, and the first recommendations were published in the CCITT Yellow Books of 1981. During the past decade, the applications of SS7 applications have expanded, and now also include call control in the integrated services digital network (ISDN), and operations in the network that aeennot related to individual trunks. Most of this work has been published in the CCITT Blue Books of 1989. More recent additions have been issued as individual International Telecommunications...
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