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題 名 | 同軸電纜傳送語音技術=Telephony Transmission Over Coaxial Cable |
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作 者 | 彭正文; 陳聰謀; 李榮輝; 吳振祥; 陳佐銘; 陳振興; | 書刊名 | 電信研究 |
卷 期 | 26:2 1996.04[民85.04] |
頁 次 | 頁245-258 |
分類號 | 448.6 |
關鍵詞 | 同軸電纜; 傳送語音技術; |
語 文 | 中文(Chinese) |
中文摘要 | 今日的同軸朧纜已非單純地提供視訊服務而已,應用其高達1GHz的頻寬,可作雙 向傳送,不論是類比或數位信號;在頭端或交換機主控端結合視訊與語音訊號,經由混合式 光纖╱同軸(Hybrid Fiber/Coax, HFC)傳輸網路,將信號送至鄰近用戶家的終端介面,提供 用戶服務。其傳送方式因使用不同的技術各有其缺點,本篇擬介紹電話服務在HFC網路架構 上的傳送技術,諸如系統容量、使用頻寬、上下行傳送技糐、分配網路、供電、可靠度、BER、 Round Trip Delay等。 |
英文摘要 | Today's coaxial cables are not only providing entertainment video signals, but also transmitting 2-way digital signals by taking advantages of its almostl 1GHz bandwidth. The signals from Headend and Central Office are combined to form a TDM stream. And the downstream signal is transported by way of Hybrid Fiber/Coax (HFC) network to the customers. Several methods exist for combining and transporting telephony and video signals such as: QPSK, 16 QAM, BPSK, …etc. Each has its advantages and drawbacks. This paper discusses the characteristic considerations of telephony transmission over coax cable such as system bandwidth, up/down-stream schemes, digital modulation techniques, distribution plant, network powering and reliability. |
本系統中英文摘要資訊取自各篇刊載內容。