電(dian)話(hua)(hua)[英語:Telephone,出(chu)自希(xi)臘語τ?λε(tēle,意為“遠”)和φων?(phōnē,意為“聲(sheng)(sheng)音”),舊譯德(de)律(lv)風(feng)]是一種可以傳(chuan)(chuan)送與(yu)接收聲(sheng)(sheng)音的(de)遠程(cheng)通(tong)(tong)信設(she)備。早(zao)在18世紀歐洲已有“電(dian)話(hua)(hua)”一詞,用(yong)來指用(yong)線串(chuan)成的(de)話(hua)(hua)筒(以線串(chuan)起杯子)。電(dian)話(hua)(hua)的(de)出(chu)現要(yao)歸功于亞(ya)歷山大·格拉漢姆·貝爾(er),早(zao)期電(dian)話(hua)(hua)機(ji)的(de)原理為:說話(hua)(hua)聲(sheng)(sheng)音為空氣里的(de)復合振動,可傳(chuan)(chuan)輸(shu)到固體(ti)上(shang),通(tong)(tong)過電(dian)脈沖于導電(dian)金(jin)屬(shu)上(shang)傳(chuan)(chuan)遞。貝爾(er)于1876年3月申請了電(dian)話(hua)(hua)的(de)專利(li)權。
美國(guo)國(guo)會2002年6月15日(ri)269號(hao)決議確(que)認安(an)東(dong)尼(ni)奧·穆(mu)齊為電話(hua)的(de)(de)發(fa)明人。穆(mu)齊于1860年首(shou)次向公眾展示了(le)他的(de)(de)發(fa)明,并在紐約的(de)(de)意大利語報紙上(shang)發(fa)表了(le)關于這項發(fa)明的(de)(de)介紹(shao)。
歷史(shi)上對電(dian)話(hua)(hua)的改進和發明包括:碳粉話(hua)(hua)筒、人(ren)工交(jiao)換板、撥號盤(pan)、自動電(dian)話(hua)(hua)交(jiao)換機(ji)、程控(kong)電(dian)話(hua)(hua)交(jiao)換機(ji)、雙音多頻撥號、語音數字采樣等(deng)(deng)。近年(nian)來的新技術包括:ISDN、DSL、網絡(luo)電(dian)話(hua)(hua)、模擬移(yi)動電(dian)話(hua)(hua)和數字移(yi)動電(dian)話(hua)(hua)等(deng)(deng)。
這(zhe)一行業通常(chang)分(fen)為電話設備制造(zao)商和電話網(wang)(wang)絡(luo)(luo)運(yun)(yun)營(ying)商。在(zai)歷史上,網(wang)(wang)絡(luo)(luo)運(yun)(yun)營(ying)商通常(chang)都擁有全(quan)國(guo)性的(de)(de)(de)(de)(de)壟斷。近年來,隨(sui)著全(quan)球電信(xin)市場的(de)(de)(de)(de)(de)開放(fang)和集成(cheng)(cheng)(cheng)以及(ji)技術的(de)(de)(de)(de)(de)發展(zhan),逐漸出現(xian)多(duo)家運(yun)(yun)營(ying)商在(zai)同一市場競(jing)爭(zheng)的(de)(de)(de)(de)(de)局面。例如,貝(bei)(bei)爾系統(tong),即(ji)AT&T的(de)(de)(de)(de)(de)下屬(shu)公(gong)(gong)司(si)(si)曾擁有美國(guo)電話市場的(de)(de)(de)(de)(de)80%。1984年,由于美國(guo)司(si)(si)法部反壟斷訴訟,貝(bei)(bei)爾系統(tong)被迫(po)分(fen)區成(cheng)(cheng)(cheng)多(duo)個(ge)(ge)獨立(li)的(de)(de)(de)(de)(de)地(di)方貝(bei)(bei)爾公(gong)(gong)司(si)(si)。有一個(ge)(ge)說(shuo)法可以說(shuo)明這(zhe)個(ge)(ge)現(xian)象:在(zai)AT&T未分(fen)區前(qian),IBM是美國(guo)第(di)二大公(gong)(gong)司(si)(si)。在(zai)AT&T分(fen)區成(cheng)(cheng)(cheng)七個(ge)(ge)公(gong)(gong)司(si)(si)后(hou),IBM的(de)(de)(de)(de)(de)排名變成(cheng)(cheng)(cheng)第(di)八名。
電話機是(shi)通過(guo)電信(xin)號(hao)雙(shuang)向(xiang)傳輸話音的終端設備。
歷史上對(dui)電(dian)(dian)(dian)話機(ji)的改進和發明包(bao)括:碳粉話筒、電(dian)(dian)(dian)話人工交(jiao)(jiao)(jiao)換(huan)板(ban)、撥號(hao)盤、自動電(dian)(dian)(dian)話交(jiao)(jiao)(jiao)換(huan)機(ji)、程控電(dian)(dian)(dian)話交(jiao)(jiao)(jiao)換(huan)機(ji)、雙音多頻撥號(hao)、語音數字采(cai)樣等(deng)。新技術(shu)包(bao)括:ISDN、DSL、模(mo)擬(ni)移(yi)動電(dian)(dian)(dian)話和數字移(yi)動電(dian)(dian)(dian)話機(ji)等(deng)。
電話(hua)電源(yuan)線、電話(hua)線、收(shou)線開關、受(shou)話(hua)器、增音按鈕(niu)、送話(hua)器、本機號(hao)(hao)碼(ma)片、鈴聲(sheng)及(ji)免(mian)(mian)提(ti)喇叭、記憶(yi)代碼(ma)鍵、記憶(yi)號(hao)(hao)碼(ma)片、數字(zi)按鍵、記憶(yi)取出鍵、記憶(yi)儲存鍵、重(zhong)撥鍵、工作指示燈(deng)、免(mian)(mian)提(ti)鍵、R鍵、免(mian)(mian)提(ti)送話(hua)器、鈴聲(sheng)調節(jie)開關、P/T開關、免(mian)(mian)提(ti)接收(shou)音量調節(jie)旋鈕(niu)。
電話通信(xin)是(shi)通過聲能(neng)與電能(neng)相互(hu)轉換、并利(li)用(yong)(yong)“電”這(zhe)個媒介來(lai)傳輸語言的一(yi)種(zhong)通信(xin)技術。兩個用(yong)(yong)戶要進行通信(xin),最(zui)簡單的形式(shi)就是(shi)將兩部電話機用(yong)(yong)一(yi)對線路連接起(qi)來(lai)。
當發話(hua)者(zhe)拿起電話(hua)機對著送話(hua)器講話(hua)時,聲(sheng)帶(dai)的振(zhen)動激勵空氣振(zhen)動,形成聲(sheng)波(bo)。
聲(sheng)波作用于送話器上,使(shi)之產生(sheng)電流(liu),稱為話音(yin)電流(liu)。
話音(yin)電流沿著線路(lu)傳送到(dao)對方電話機的(de)受話器內。
而受話(hua)器(qi)作(zuo)用與(yu)送(song)話(hua)器(qi)剛好相反——把電流轉化(hua)為聲(sheng)波,通過空氣傳至(zhi)人的耳朵中。
這(zhe)樣(yang),就(jiu)完成了最(zui)簡單(dan)的通(tong)話過程。
電(dian)(dian)話(hua)(hua)(hua)(hua)(hua)機(ji)(ji)(ji)(ji)是(shi)美(mei)國人A.G.貝爾于(yu)1876年(nian)發明的。他(ta)用(yong)兩根導線連接兩個(ge)結構完全(quan)相(xiang)同、在電(dian)(dian)磁鐵上裝有振(zhen)動膜片(pian)的送話(hua)(hua)(hua)(hua)(hua)器(qi)和(he)(he)受(shou)話(hua)(hua)(hua)(hua)(hua)器(qi),首先實現(xian)(xian)兩端通(tong)話(hua)(hua)(hua)(hua)(hua)。但通(tong)話(hua)(hua)(hua)(hua)(hua)距離短、效率低(di)。1878年(nian)出(chu)現(xian)(xian)了(le)(le)(le)炭精送話(hua)(hua)(hua)(hua)(hua)器(qi),使電(dian)(dian)話(hua)(hua)(hua)(hua)(hua)機(ji)(ji)(ji)(ji)送話(hua)(hua)(hua)(hua)(hua)器(qi)效率大(da)大(da)提高。受(shou)話(hua)(hua)(hua)(hua)(hua)器(qi)結構也有改進。最(zui)早的電(dian)(dian)話(hua)(hua)(hua)(hua)(hua)機(ji)(ji)(ji)(ji)是(shi)磁石電(dian)(dian)話(hua)(hua)(hua)(hua)(hua)機(ji)(ji)(ji)(ji),靠自備電(dian)(dian)池(chi)供(gong)(gong)電(dian)(dian),用(yong)手搖發電(dian)(dian)機(ji)(ji)(ji)(ji)發送呼叫信(xin)號(hao)。1880年(nian)出(chu)現(xian)(xian)共(gong)電(dian)(dian)式電(dian)(dian)話(hua)(hua)(hua)(hua)(hua)機(ji)(ji)(ji)(ji),改由共(gong)電(dian)(dian)交換(huan)(huan)機(ji)(ji)(ji)(ji)集(ji)中(zhong)供(gong)(gong)電(dian)(dian),省去手播發電(dian)(dian)機(ji)(ji)(ji)(ji)和(he)(he)干電(dian)(dian)池(chi)。1891年(nian)出(chu)現(xian)(xian)了(le)(le)(le)旋轉撥號(hao)盤式自動電(dian)(dian)話(hua)(hua)(hua)(hua)(hua)機(ji)(ji)(ji)(ji),它可以發出(chu)直流撥號(hao)脈沖(chong),控制(zhi)自動交換(huan)(huan)機(ji)(ji)(ji)(ji)動作,選擇被叫用(yong)戶,自動完成(cheng)(cheng)交換(huan)(huan)功能(neng)。從而(er)(er)把電(dian)(dian)話(hua)(hua)(hua)(hua)(hua)通(tong)信(xin)推向(xiang)一個(ge)新(xin)(xin)階段。到(dao)20世紀60年(nian)代末(mo)期出(chu)現(xian)(xian)了(le)(le)(le)按鍵(jian)(jian)式全(quan)電(dian)(dian)子(zi)(zi)電(dian)(dian)話(hua)(hua)(hua)(hua)(hua)機(ji)(ji)(ji)(ji)。除脈沖(chong)發號(hao)方式外,又出(chu)現(xian)(xian)了(le)(le)(le)雙音多(duo)(duo)頻(DTMF)發號(hao)方式。隨(sui)著程控交換(huan)(huan)機(ji)(ji)(ji)(ji)的發展,雙音頻按鍵(jian)(jian)電(dian)(dian)話(hua)(hua)(hua)(hua)(hua)機(ji)(ji)(ji)(ji)已(yi)逐步普及。電(dian)(dian)子(zi)(zi)電(dian)(dian)話(hua)(hua)(hua)(hua)(hua)機(ji)(ji)(ji)(ji)電(dian)(dian)路正(zheng)在向(xiang)集(ji)成(cheng)(cheng)化(hua)邁進,話(hua)(hua)(hua)(hua)(hua)機(ji)(ji)(ji)(ji)專(zhuan)用(yong)集(ji)成(cheng)(cheng)電(dian)(dian)路已(yi)廣泛用(yong)于(yu)話(hua)(hua)(hua)(hua)(hua)機(ji)(ji)(ji)(ji)電(dian)(dian)路各組成(cheng)(cheng)部分。各種多(duo)(duo)功能(neng)電(dian)(dian)話(hua)(hua)(hua)(hua)(hua)機(ji)(ji)(ji)(ji)和(he)(he)特(te)種用(yong)途電(dian)(dian)話(hua)(hua)(hua)(hua)(hua)機(ji)(ji)(ji)(ji)也應運而(er)(er)生。到(dao)20世紀90年(nian)代初,已(yi)有了(le)(le)(le)將撥號(hao)、通(tong)話(hua)(hua)(hua)(hua)(hua)、振(zhen)鈴三(san)種功能(neng)集(ji)于(yu)一塊集(ji)成(cheng)(cheng)電(dian)(dian)路上的電(dian)(dian)話(hua)(hua)(hua)(hua)(hua)機(ji)(ji)(ji)(ji)。隨(sui)著話(hua)(hua)(hua)(hua)(hua)音識別技術(shu)的發展,直接用(yong)話(hua)(hua)(hua)(hua)(hua)音“撥號(hao)”的新(xin)(xin)型電(dian)(dian)話(hua)(hua)(hua)(hua)(hua)機(ji)(ji)(ji)(ji)也正(zheng)在出(chu)現(xian)(xian)。
最(zui)初的電(dian)話(hua)機(ji)(終端)是(shi)由微型(xing)發(fa)(fa)(fa)電(dian)機(ji)和電(dian)池構成的磁石式電(dian)話(hua)機(ji),打電(dian)話(hua)時,使用者用手(shou)搖微型(xing)發(fa)(fa)(fa)電(dian)機(ji)發(fa)(fa)(fa)出電(dian)信號呼叫(jiao)對(dui)方,對(dui)方啟(qi)機(ji)后構成通話(hua)回路。后來,1877年愛(ai)迪生(sheng)(T.E.Edison)發(fa)(fa)(fa)明了碳(tan)素(su)送話(hua)器和誘導線路后通話(hua)距離延長了。同一年又發(fa)(fa)(fa)明了共電(dian)式電(dian)話(hua)機(ji)。1891年終于發(fa)(fa)(fa)展到(dao)A.B.Strowger發(fa)(fa)(fa)明了自動式電(dian)話(hua)機(ji)。
電話(hua)機設置在(zai)電話(hua)通信起點(dian)和(he)終(zhong)點(dian)的(de)用戶側,是(shi)電話(hua)網的(de)用戶終(zhong)端設備。現代(dai)的(de)電話(hua)機能夠方(fang)便地實現終(zhong)端用戶之間的(de)呼叫和(he)通話(hua),是(shi)經過一(yi)百多年來許(xu)多人的(de)研究和(he)無數次的(de)改進(jin)而形成的(de)。盡管它(ta)們的(de)式樣千差萬別,但一(yi)般都有如(ru)下(xia)基本功能:
1、聲電互換
因為要進行快(kuai)速的(de)(de)、遠距離的(de)(de)通(tong)信(xin),不能直接傳送聲(sheng)音(yin)(yin),而必須先把(ba)聲(sheng)音(yin)(yin)變(bian)成電信(xin)號(即以電作為載體),到對方(fang)后再把(ba)電信(xin)號還原成為聲(sheng)音(yin)(yin)。
2、摘機識別
當主叫(jiao)方(fang)拿起電(dian)話(hua)機時(shi),交換機應(ying)有能知(zhi)道“有人(ren)要打電(dian)話(hua)”的功能,以便交換機做好(hao)接續準備(bei)。
3、發送信號
自動電(dian)話機正是通過發(fa)送撥號信(xin)號來(lai)指(zhi)揮電(dian)話交換(huan)機的(de)工(gong)作,并進而建立(li)兩個電(dian)話機之間的(de)連(lian)接的(de)。
4、響鈴
即在(zai)對方來(lai)電(dian)話時,電(dian)話機能以鈴(ling)聲告訴主人(ren):“有人(ren)來(lai)電(dian)話了。”
5、電接續
電話(hua)(hua)機中,實現這五大(da)功能的部(bu)件依次(ci)是:送受話(hua)(hua)器、叉簧、撥號(hao)盤(或(huo)按鍵盤)、電話(hua)(hua)鈴和電話(hua)(hua)回(hui)路。
電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)機(ji)具(ju)有(you)將(jiang)終端的(de)(de)(de)音(yin)(yin)(yin)(yin)波轉(zhuan)換為電(dian)(dian)(dian)(dian)子信(xin)號(hao),通過(guo)電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)線(xian)(xian)傳(chuan)(chuan)送(song)(song)到(dao)遠距離的(de)(de)(de)對(dui)(dui)方(fang)(fang)(fang),同(tong)時將(jiang)對(dui)(dui)方(fang)(fang)(fang)傳(chuan)(chuan)送(song)(song)來(lai)的(de)(de)(de)電(dian)(dian)(dian)(dian)子信(xin)號(hao)再生為語(yu)(yu)音(yin)(yin)(yin)(yin)(音(yin)(yin)(yin)(yin)波),使其通話(hua)(hua)(hua)的(de)(de)(de)功(gong)能(neng),以及(ji)發送(song)(song)可從(cong)多個對(dui)(dui)方(fang)(fang)(fang)中選擇(ze)的(de)(de)(de)信(xin)號(hao)(撥號(hao)脈(mo)沖),告知對(dui)(dui)方(fang)(fang)(fang)的(de)(de)(de)呼叫音(yin)(yin)(yin)(yin)等(deng)功(gong)能(neng)。電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)機(ji)由將(jiang)語(yu)(yu)音(yin)(yin)(yin)(yin)轉(zhuan)換為電(dian)(dian)(dian)(dian)流發送(song)(song)到(dao)電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)線(xian)(xian)的(de)(de)(de)送(song)(song)話(hua)(hua)(hua)機(ji)、將(jiang)對(dui)(dui)方(fang)(fang)(fang)傳(chuan)(chuan)送(song)(song)來(lai)的(de)(de)(de)電(dian)(dian)(dian)(dian)流還原為語(yu)(yu)音(yin)(yin)(yin)(yin)的(de)(de)(de)受(shou)(shou)話(hua)(hua)(hua)機(ji)、呼叫對(dui)(dui)方(fang)(fang)(fang)的(de)(de)(de)撥號(hao)或按鈕、發送(song)(song)呼叫音(yin)(yin)(yin)(yin)的(de)(de)(de)鈴聲、將(jiang)這些連接在電(dian)(dian)(dian)(dian)話(hua)(hua)(hua)線(xian)(xian)上(shang)執行(xing)其功(gong)能(neng)的(de)(de)(de)線(xian)(xian)路(lu)網等(deng)組成(cheng)。送(song)(song)話(hua)(hua)(hua)機(ji)內有(you)裝(zhuang)滿(man)碳素顆粒的(de)(de)(de)小箱(xiang)子,其前方(fang)(fang)(fang)有(you)薄硬鋁合金振(zhen)(zhen)動(dong)(dong)板。振(zhen)(zhen)動(dong)(dong)板根據語(yu)(yu)音(yin)(yin)(yin)(yin)振(zhen)(zhen)動(dong)(dong),振(zhen)(zhen)動(dong)(dong)碳素顆粒,碳素顆粒傳(chuan)(chuan)導(dao)電(dian)(dian)(dian)(dian)流,隨著顆粒的(de)(de)(de)接觸(chu)程度,電(dian)(dian)(dian)(dian)阻發生變化,生成(cheng)語(yu)(yu)音(yin)(yin)(yin)(yin)電(dian)(dian)(dian)(dian)流。受(shou)(shou)話(hua)(hua)(hua)機(ji)接受(shou)(shou)對(dui)(dui)方(fang)(fang)(fang)的(de)(de)(de)語(yu)(yu)音(yin)(yin)(yin)(yin)電(dian)(dian)(dian)(dian)流后,在線(xian)(xian)圈上(shang)生成(cheng)語(yu)(yu)音(yin)(yin)(yin)(yin)電(dian)(dian)(dian)(dian)流引起的(de)(de)(de)磁(ci)力,振(zhen)(zhen)動(dong)(dong)鐵振(zhen)(zhen)動(dong)(dong)板,發出聲音(yin)(yin)(yin)(yin)。
無(wu)線環路-無(wu)繩電話
電話子母機
數字無繩電話
模擬無繩電話
移動電話手機
小(xiao)靈(ling)通(無線電(dian)話)
隨著IT技術(shu)的(de)不(bu)斷的(de)飛速發展,嵌入式終端設備(bei)的(de)處理(li)能(neng)力越(yue)來越(yue)強,21世(shi)紀初出現了一種帶個(ge)人數據助理(li)(PDA)的(de)電話機(ji)“智能(neng)電話”。
智(zhi)能(neng)(neng)電(dian)(dian)(dian)話(hua)(hua)除了(le)有(you)完整的(de)(de)(de)固定(ding)電(dian)(dian)(dian)話(hua)(hua)功(gong)(gong)(gong)能(neng)(neng)外,通(tong)常還具有(you)大(da)容量(liang)的(de)(de)(de)名(ming)片(pian)管理功(gong)(gong)(gong)能(neng)(neng)、來去(qu)電(dian)(dian)(dian)管理功(gong)(gong)(gong)能(neng)(neng)、防止電(dian)(dian)(dian)話(hua)(hua)騷擾(rao)(電(dian)(dian)(dian)話(hua)(hua)防火墻)功(gong)(gong)(gong)能(neng)(neng)、企業集團(tuan)電(dian)(dian)(dian)話(hua)(hua)名(ming)片(pian)(內部名(ming)片(pian))管理功(gong)(gong)(gong)能(neng)(neng),以及輔助辦公的(de)(de)(de)許多功(gong)(gong)(gong)能(neng)(neng),比如:日(ri)程安排、便箋、日(ri)歷、計算器等功(gong)(gong)(gong)能(neng)(neng)。早期的(de)(de)(de)智(zhi)能(neng)(neng)電(dian)(dian)(dian)話(hua)(hua)通(tong)過撥(bo)號上網,具有(you)一定(ding)的(de)(de)(de)信息交換(huan)能(neng)(neng)力(li),實現了(le)發送短信、接(jie)收文字信息的(de)(de)(de)功(gong)(gong)(gong)能(neng)(neng)。隨著(zhu)固網智(zhi)能(neng)(neng)電(dian)(dian)(dian)話(hua)(hua)在中國近十年的(de)(de)(de)發展(zhan),其處理能(neng)(neng)力(li)加強,逐(zhu)漸地(di)增加了(le)智(zhi)能(neng)(neng)手機(Smartphone)具有(you)的(de)(de)(de)功(gong)(gong)(gong)能(neng)(neng)。
智(zhi)能(neng)電話已有通過因(yin)特網上網的(de)能(neng)力及較強(qiang)的(de)多媒的(de)體功能(neng)。可以進行網絡瀏(liu)覽、音視頻的(de)播放、具有電子書、電子相框等功能(neng)。同時智(zhi)能(neng)電話在輔助辦公(gong)、輔助營銷、娛樂等方(fang)面的(de)功能(neng)也有了(le)大(da)大(da)的(de)加強(qiang)。在對傳統固定電話顛覆的(de)基礎上,實現(xian)了(le)更多的(de)商務功能(neng)和PDA功能(neng)。
環境溫度(du):-10℃~40℃
相對濕度:45%~95%
大氣壓力:860~1060mbar
環(huan)境噪聲:≤60dB(A)
1、工作頻率:300~3400HZ
2、脈(mo)沖通斷比:1.6±0.2∶1
3、雙音頻撥號頻偏:≤±1.5%
4、雙音(yin)頻信(xin)號(hao)電(dian)平:①低頻群(qun):-9±3dB;②高頻群(qun):-7±3dB;③頻率組合中高頻分量(liang)比低頻分量(liang)高2±1dB
5、振鈴聲級:≥70dB(A)
6、電聲性能:
①在0公里時(shi),客(ke)觀(guan)發(fa)送參(can)考當(dang)量≥+3;在3公里時(shi),客(ke)觀(guan)發(fa)送參(can)考當(dang)量≤+15;在5公里時(shi),客(ke)觀(guan)發(fa)送參(can)考當(dang)量≤+15。
②在(zai)0公(gong)里時(shi)(shi),客觀(guan)接(jie)收(shou)參考當(dang)量(liang)≥-5;在(zai)3公(gong)里時(shi)(shi),客觀(guan)接(jie)收(shou)參考當(dang)量(liang)≤+2;在(zai)5公(gong)里時(shi)(shi),客觀(guan)接(jie)收(shou)摻考當(dang)量(liang)≤+2。
③在0公(gong)(gong)里(li)時,客觀(guan)側(ce)音(yin)參考當量≥+3;在3公(gong)(gong)里(li)時,客觀(guan)側(ce)音(yin)參考當量≥+10;在5公(gong)(gong)里(li)時,客觀(guan)側(ce)音(yin)參考當量≥+10。
高科技電(dian)話(hua)機(ji)的(de)(de)(de)發(fa)(fa)展都是(shi)(shi)隨著無(wu)線通(tong)信的(de)(de)(de)發(fa)(fa)達而形(xing)成的(de)(de)(de)。電(dian)話(hua)機(ji)的(de)(de)(de)發(fa)(fa)展趨勢(shi)經(jing)過Digital電(dian)話(hua)機(ji)和(he)PCS后發(fa)(fa)展到可(ke)以用(yong)衛星通(tong)信的(de)(de)(de)IMT-200服(fu)務。IMT-200支持信息的(de)(de)(de)高速傳送,Packet,畫像等(deng)多媒體的(de)(de)(de)服(fu)務,將來(lai)世界(jie)各個(ge)地方都可(ke)以使用(yong)所有聲(sheng)音電(dian)話(hua),電(dian)報用(yong)戶直(zhi)通(tong)電(dian)路,傳呼和(he)電(dian)子郵件;隨著電(dian)子郵件的(de)(de)(de)普及(ji),網絡也日益化,網絡電(dian)話(hua)已(yi)是(shi)(shi)不可(ke)阻擋的(de)(de)(de)發(fa)(fa)展趨勢(shi)。現有的(de)(de)(de)固(gu)(gu)定電(dian)話(hua),已(yi)經(jing)不能提(ti)供人(ren)們的(de)(de)(de)需(xu)要了。未來(lai)的(de)(de)(de)固(gu)(gu)定電(dian)話(hua)講裝備攝像頭,帶有色彩(cai)的(de)(de)(de)液晶顯示器(qi),我們在接固(gu)(gu)定電(dian)話(hua)的(de)(de)(de)時候(hou),都能夠看到雙方。