【正文】
space 默認(rèn)命名空間deferred request authentication 推遲請(qǐng)求驗(yàn)證defining required attributes 定義必要屬性defining the type of attribute values 定義屬性值類型deflate deflate(一種壓縮算法)delivered image 傳輸完成的圖像delivery context 傳送上下文delivery policy 傳送策略delivery unit 傳送單位deprecated 棄用depth 深度descendant 子節(jié)點(diǎn)descendants 子節(jié)點(diǎn)device 設(shè)備device independent 與設(shè)備無(wú)關(guān)的deviceindependence 設(shè)備無(wú)關(guān)dialog 對(duì)話digital rights management 數(shù)字版權(quán)管理digital signature 數(shù)字簽名dimensions of variability 變化元direct subexpression (of a mathML expression of) (mathML表達(dá)式的)直接子表達(dá)式directly contained (element A in B) (A)直接包含于(B)director 領(lǐng)導(dǎo)人、總監(jiān)discovery 探索discovery service 探索服務(wù)discretionary choices 任意選項(xiàng)discretionary items 任意條款document 文檔document character set 文檔字符集document content, structure, and presentation 文檔內(nèi)容、結(jié)構(gòu)、表示document entity 文檔實(shí)體document language 文檔語(yǔ)言document model 文檔模型document object model 文檔對(duì)象模型document object, document 文檔對(duì)象、文檔document order 文檔順序document profile 文檔設(shè)置文件document source, text source, 文檔源、文本源document style semantics and specification language (DSSSL) 文檔風(fēng)格語(yǔ)義和規(guī)范語(yǔ)言(DSSSL)document tree 文檔樹(shù)document type 文檔類型document type declaration 文檔類型聲明document type definition (DTD) 文檔類型定義(DTD)documentation 參考文件DOM (document object model) DOM(文檔對(duì)象模型)DOM (document object model, see同時(shí),由于GPRS是分組交換技術(shù),應(yīng)用了統(tǒng)計(jì)復(fù)用技術(shù),因此GPRS開(kāi)通的數(shù)據(jù)通信,是按發(fā)送數(shù)據(jù)的量計(jì)費(fèi),而不是按發(fā)送的時(shí)間長(zhǎng)短計(jì)費(fèi),所以對(duì)用戶來(lái)說(shuō)還可以節(jié)省費(fèi)用?!皠?dòng)態(tài)復(fù)用”可以使一個(gè)小區(qū)的所有移動(dòng)用戶共享同一資源,從而大大提高了帶寬資源的利用率。GPRS的優(yōu)點(diǎn)GPRS采用分組交換技術(shù),與現(xiàn)有GSM的電路交換技術(shù)比較,每個(gè)用戶可以有多個(gè)無(wú)線信道可用,而同一無(wú)線信道又可以由多個(gè)用戶共享。CDPD可以支持移動(dòng)上網(wǎng)、遠(yuǎn)程遙測(cè)、車輛調(diào)度、銀行提款、無(wú)線炒股、現(xiàn)場(chǎng)服務(wù)、商業(yè)POS系統(tǒng)等等。CDPD擁有一張專用的無(wú)線數(shù)據(jù)網(wǎng),信號(hào)不易受干擾,可以上任何網(wǎng)站。常見(jiàn)的蜂窩系統(tǒng)包括GSM和CDMA,它們都屬于第二代通信技術(shù)。將一個(gè)大的地理區(qū)域分割成多個(gè)“蜂窩”的目的,是充分利用有限的無(wú)線傳輸頻率。如果該部電話機(jī)進(jìn)入另一個(gè)信元,呼叫就自動(dòng)轉(zhuǎn)移至新信元內(nèi)的基站。CMTSCMTS代表的是Cellular Mobile Telephone System,中文含義是蜂窩移動(dòng)電話系統(tǒng)。PCS的頻率為1900MHz.DAMPSDAMPS的全稱是Digital AMPS,其中AMPS是一種高級(jí)移動(dòng)電話服務(wù)技術(shù),該技術(shù)為模擬蜂窩系統(tǒng),使用800MHz頻譜,在美國(guó)占主導(dǎo)地位。該技術(shù)按照英國(guó)標(biāo)準(zhǔn)而設(shè)計(jì)的模擬式移動(dòng)電話系統(tǒng),其頻率范圍為900MHz。GSM系統(tǒng)可根據(jù)無(wú)線鏈路傳輸質(zhì)量選擇GMSK或8PSK兩種調(diào)制方式。通信工程專業(yè)英語(yǔ)詞匯動(dòng)態(tài)范圍: Dynamic range頻率偏值: Frequency offset符號(hào)率: Symbol rate碼域功率: code domain power頻分多址: Frequency Division Multiple Access碼分多址: Code Division Multiple Access時(shí)分多址: Time Division Multiple Access沃什碼: Walsh code誤碼率: Bit Error Rate,BER幀誤碼率: Frame Error Rate,F(xiàn)ER循環(huán)冗余碼:Cyclic Redundancy Code,CRC時(shí)序分析: timing analyze門(mén)限: threshold非同步模式: Asynchronous Mode同步模式: Synchronous Mode鄰道功率: ACP D―― Adjacent Channel Power先進(jìn)移動(dòng)電話業(yè)務(wù):AMPSAdvanced Mobile Phone Service組織協(xié)會(huì):ANSI American National Standard Institute 美國(guó)國(guó)家標(biāo)準(zhǔn)局BPT British Post and Telemunication Standard 英國(guó)郵政與電信標(biāo)準(zhǔn)CCIR International Radio Consultative Committee 國(guó)際無(wú)線電咨詢委員會(huì)CCITT International Telegraph and Telephone Consultative Committee國(guó)際/電報(bào)咨詢委員會(huì)CEPT Conference of European Post and Telemunication Administrations歐洲郵電行政會(huì)議EIA Electronic Engineers Association 電子工業(yè)協(xié)會(huì) 美ETSI European Telemunication Standards Institute歐洲電信標(biāo)準(zhǔn)委員會(huì)FCC Federal Communications Commission聯(lián)邦通信委員會(huì) 美IEC International Electrotechnics Committee國(guó)際電工委員會(huì)IEE Institution of Electrical Engineers電氣工程師協(xié)會(huì) 英IEEE Institution of Electrical and Electronics Engineers, INC電氣與電子工程師協(xié)會(huì) 美ITU International Telemunication Union 國(guó)際電信聯(lián)盟 聯(lián)合國(guó)MPT Ministry of Post and telemunications郵政與電信部 英TIA Telemunications Industries Association電信工業(yè)協(xié)會(huì) 美WARC World Administrative Radio Conference世界無(wú)線電行政大會(huì)ZVEI Zentralverband der Electechnischen Industrie電氣工業(yè)中央?yún)f(xié)會(huì)德ACP Adjacent Channel Power鄰道功率AMPS Advanced Mobile Phone Institute先進(jìn)移動(dòng)電話業(yè)務(wù)APOC Advanced Paging Operator Code先進(jìn)尋呼操作碼AVL Average Voice Level平均話音電平BSC Base Site Controller基站控制器CDMA Code Division Mulitiple Code碼分多址CDPD Cellular Digital Packet Data蜂窩分組數(shù)據(jù)系統(tǒng)CSC Cell Site Controllor小區(qū)控制器DCCH Digital Control Channel數(shù)字控制信道DECT Digital Enhanced Cordless Telemunications數(shù)字增強(qiáng)無(wú)繩電話EDACS Enhanced Digital Access Communications System加強(qiáng)的數(shù)字接入通信系統(tǒng)ERMES European Telemunications Standards Institute歐洲無(wú)線電信息系統(tǒng)ESN Electronics Serial Number電子串號(hào)FDR Frequency Domain Reflectometry頻域反射計(jì)FLEX Flexible Paging System可變速尋呼系統(tǒng)FOCC Forward Control Channel前向控制信道FVC Forward Voice Channel前向話音信道GSC Golay Sequential Coding格雷碼GSM Global System for Mobile Communications全球移動(dòng)通信系統(tǒng)IBASIC Instrument BASIC儀器BASIC語(yǔ)言IDC Instantaneous Deviation Control瞬時(shí)頻偏控制IMSI International Mobile Station Identify國(guó)際移動(dòng)臺(tái)識(shí)別號(hào)碼LNA Low Noise Amplifier低噪聲放大器LPF/HPF Low/High Pass Filter低通/高通濾波器LSB/USB Lower/Upper Side Band下/上邊帶MCC Mobile Country Code移動(dòng)業(yè)務(wù)國(guó)家號(hào)碼MCS Mobile Control Station移動(dòng)控制站MIN Mobile Identification Number移動(dòng)識(shí)別碼MNC Mobile Network Code移動(dòng)電話網(wǎng)號(hào)碼MSC Mobile Switching Center移動(dòng)交換中心MSIN Mobile Station Identification Number移動(dòng)臺(tái)識(shí)別碼MTSO Mobile Telephone Switching Office移動(dòng)電話交換局NMSI National Mobile Station Identify國(guó)內(nèi)移動(dòng)臺(tái)識(shí)別號(hào)碼NMT Nordic Mobile Telephone北歐移動(dòng)電話系統(tǒng)OTP One Time Programmable一次性編程PDC Personal Digital Cellular個(gè)人數(shù)字蜂窩系統(tǒng)PHS Personal HandyPhone System個(gè)人手持電話系統(tǒng)PSTN Public Switching Telephone Network公用交換電話網(wǎng)RECC Reverse Control Channel反向控制信道RVC Reverse Voice Channel反向話音信道RSSI Receiced Signal Strength Indicator接收信號(hào)場(chǎng)強(qiáng)指示SCC Signalling Channel Controller信令信道控制器SCM Station Class Mark移動(dòng)臺(tái)級(jí)別標(biāo)志SID Syste Indentification Number系統(tǒng)識(shí)別號(hào)TACS Total Access Communications System全選址通信系統(tǒng)TDMA Time Division Multiple Access時(shí)分多址UUT Under Unit Test被測(cè)單元VCC Voice Channel Controller話音信道控制器VSWR Voltages Standing Wave Ratio電壓駐波比1997年,愛(ài)立信公司向ETSI(歐洲電信標(biāo)準(zhǔn)委員會(huì))提出了EDGE的可行性研究方案,并在同年得到認(rèn)可。由于8PSK調(diào)制是線性調(diào)制,其每個(gè)符號(hào)傳送3比特信息,從而使數(shù)據(jù)傳輸速率提高 3倍。PCSPCS是Personal Communications Service的縮寫(xiě),意思是“個(gè)人通訊服務(wù)”。相對(duì)應(yīng)地,Digital AMPS代表的是數(shù)字化高級(jí)移動(dòng)電話系統(tǒng)。該系統(tǒng)內(nèi)的每一個(gè)地區(qū)都由一個(gè)基站覆蓋。CellularCellular的中文含義是“蜂窩(技術(shù))”,它是一種無(wú)線通信技術(shù)。每一組連接(對(duì)于無(wú)線電話而言就是每一組會(huì)話)都需要專門(mén)的頻率,而可以使用的頻率一共只有大約1000個(gè)。(中國(guó)電信)CDPDCDPD(Cellular digital packet data),即蜂窩數(shù)字式分組數(shù)據(jù)交換網(wǎng)絡(luò),被人們稱作真正的無(wú)線互聯(lián)網(wǎng)。與其它無(wú)線上網(wǎng)方式相比。目前本市已有不少行業(yè)使用了這一業(yè)務(wù)。它采用了“統(tǒng)計(jì)復(fù)用”或“動(dòng)態(tài)復(fù)用”的技術(shù)。GPRS不僅僅是對(duì)發(fā)送數(shù)據(jù)