7. 從平面化到電子化到行動化 Growth rate: years to reach a quarter of the US population Growth per year 4.0% 3.0% 2.0% 1.0% 0% Telephone 35 years Newspaper 公元前 60 年 Television 26 years Radio 22 years Mobile 13 years Internet 7 years
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14. 網路與電信匯流 INTERNET Telephone Network ENUM DNS Server 一個 Enum 號碼 Email / Web/SoftPhone Home/Office N umber Mobile Number Fax N umber Applications Multiple Call Forwarding Options VoIP Int’l Call Instant Messaging IP Fax Web Page 單一號碼適用於 多樣發話 / 撥號機制 PC/PDA PSTN or SIP Phone 行動電話 FAX 多樣受話選擇 SIP 協定 IPv6, Broadband 環境 ENUM 此一名詞主要由 [ RFC 2916 ] 而來,主要在 DNS 中建立一個電話號碼目錄檢索之功能,讓個人的電話話碼可以對應到不同的位址 (URI) ,透過 DNS 公開的標準,快速反應的特性,分散式架構,形成全世界可用的電話轉址查詢, SIP/ENUM Trial 計畫本實驗此一功能之目的,並搭配較先進的 VoIP 技術之一 : SIP ([ RFC 3261 ]) ,來達到各項功能之目的。
Here we come back to review the technologies mentioned with a little order, the names, as said before, are more or less just a lable for the technologies concerned, thus the nortorious “ alphabet soup ” AMPS represents the “ first generation ” cellular, is analog, which still works fine in areas where system capacity is not an issue NMT, TACS, etc. then are variations of AMPS with slightly different technologies, equipments, and working frequencies that emerged in different countries of the world