專業(yè)英語

——SpecializedEnglish

Unit19：第二部分通信技術AnintroductiontoIPTV

NEWWORDSANDPHRASES

interactivityn交互性；heftyadj.重的,肌肉發(fā)達的lagn.落后,遲延rolloutn.首次展示resurgencen.蘇醒headend數(shù)據轉發(fā)器fromstemtostern從頭到尾,完全prioritizevt.把...區(qū)分優(yōu)先次序diceyadj.不確定的,冒險性的,認命的multicast多播,多點傳送NEWWORDSANDPHRASES

IPTV(InternetProtocolTelevision)互聯(lián)網協(xié)議電視，網絡電視HDTV（HighDensityTelevision）高清電視VoD（VideoonDemand）視頻點播STB（SetTopBox）機頂盒DSLAM(DSLAccessMultiplier)數(shù)字用戶線接入復用器IGMP(IPGroupMembershipProtocol)IP組員協(xié)議FEC(ForwardErrorCorrection)前向糾錯RTSP(RealTimeStreamingProtocol)實時流協(xié)議InternetProtocolTelevision(IPTV)hasarrived，andbackedbythedeeppocketsofthetelecommunicationsindustry，it'spoisedtooffermoreinteractivityandbringaheftydoseofcompetitiontothebusinessofsellingTV．句中poisedadj.泰然自若的,平衡的；backv.后退,支持全句可譯為“IPTV已經到來并且受到電信工業(yè)的重金支持，自然地，它提供了更多的互動性，同時給電視銷售業(yè)務帶來了更強的競爭?！?/p>

TEXTOnceknownonlyasphonecompanies，thetelcosnowwanttoturna"tripleplay"ofvoice，data，andvideothatwillretirethesideandputthemsecurelyinthebatter'sbox．thatwillretiretheside是非限定性定語從句，用來修飾voice,data,andvideo。全句可譯為“電信公司曾經只以經營電話業(yè)務聞名，但是現(xiàn)在卻想把語音、數(shù)據、視頻這些將要退出市場的（單一）業(yè)務合三為一（一塊）經營，這樣就可以把它們牢牢地放在擊球手的位置上了。”Heretheadvantagesofowningtheentirenetworkfromstemtostern(asthetelcosdo)reallycomeintoplay，sincequalityofservice(QoS)toolscanprioritizethevideotraffictopreventdelayorfragmentationofthesignal．這是一個since引導的因果句。prioritize：把...區(qū)分優(yōu)先次序fragmentation：分裂,破碎全句可譯為“這里完全擁有整個網絡的優(yōu)勢就真正顯現(xiàn)出來了：因為服務質量（QoS）工具可以優(yōu)先為視頻業(yè)務服務，以阻止時延或信號的分散?！?/p>

ForIPTVtobecomeaviablewhole-housesolution，itwillalsoneedtosupportenoughsimultaneouschannelstoallowtelevisionsindifferentroomstodisplaydifferentcontent，andjugglingresultingbandwidthissuesisoneofthetrickiestpartsofimplementinganIPTVnetworkthatwillbeattractivetoconsumers．這是一個并列復雜句。thatwillbeattractivetoconsumers修飾IPTVnetwork。simultaneouschannels：聯(lián)播頻道viable：可行的全句可譯為“對IPTV來說，為了成為整座屋子的可行解決方案，即允許在不同的房間播出不同的內容、支持足夠多的聯(lián)播頻道是必需的。并且變戲法似的帶寬分配題是實現(xiàn)吸引消費者的IPTV網絡最頭疼的部分?！?/p>

Theobviouschallengetothisbusinessmodelcomesfrombeinga"broadcaster"withoutanetwork，whichmeansthatusersneedtobringtheirownaccessandthatcontentisdeliveredovernetworksownedbythetelcosorcableprovi