TAILIEUCHUNG - Tín hiệu trong các mạng viễn thông P4

Early CAS systems were developed independently by individual equipment manufacturers, and exist in many varieties. Later CAS systems, notably those developed after the Second World War, show the increasing influence of national and international standards. This section describes three important CAS systems, and their use on frequency-division multiplexed (FDM) analog trunks and time-division multiplexed (TDM) digital trunks ( and ). | Signaling in Telecommunication Networks. John G. van Bosse Copyright 1998 John Wiley Sons Inc. ISBNs 0-471-57377-9 Hardback 0-471-22415-4 Electronic CHANNEL-ASSOCIATED INTEREXCHANGE SIGNALING Channel-associated interexchange signaling CAS also known as per-trunk signaling has been in existence from the beginning of automatic telephony and was the only form of interexchange signaling until 1976. It is still used in telecommunication networks but is gradually being replaced by common channel signaling. Early CAS systems were developed independently by individual equipment manufacturers and exist in many varieties. Later CAS systems notably those developed after the Second World War show the increasing influence of national and international standards. This section describes three important CAS systems and their use on frequency-division multiplexed FDM analog trunks and time-division multiplexed TDM digital trunks and . The acronyms in the figures of this chapter are explained in Section . INTRODUCTION Interexchange Signaling Example Figure shows a typical interexchange signaling sequence for a call from subscriber Si to subscriber S2. The subscriber signaling for the call is not shown. After exchange A has received the called number from Sj it decides to route the call via intermediate exchange B. Exchange A seizes an available trunk Tb and sends a seizure signal on the trunk. Exchange B responds with a proceed-to-send or wink signal indicating that it is ready to receive the digits of the 68 INTRODUCTION 69 Local Exchange A Intermediate Exchange B Local Exchange C Sj Finishes --- Dialing Seizure Proceed-to-send Wink First Digit _Last Digit 0 Seizure Proceed-to-send Wink OS2 First Digit Last Digit Ringing-tone 0 __Answer 0 ---S2 Answers Answer Conversation Clear-back_ S2 Clears Clear-back__ S1 Clears Q Clear-forward O Clear-forward Release-guard__ ---------------------- .

TAILIEUCHUNG - Chia sẻ tài liệu không giới hạn
Địa chỉ : 444 Hoang Hoa Tham, Hanoi, Viet Nam
Website : tailieuchung.com
Email : tailieuchung20@gmail.com
Tailieuchung.com là thư viện tài liệu trực tuyến, nơi chia sẽ trao đổi hàng triệu tài liệu như luận văn đồ án, sách, giáo trình, đề thi.
Chúng tôi không chịu trách nhiệm liên quan đến các vấn đề bản quyền nội dung tài liệu được thành viên tự nguyện đăng tải lên, nếu phát hiện thấy tài liệu xấu hoặc tài liệu có bản quyền xin hãy email cho chúng tôi.
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.