光纖同軸電纜是什么,是銅線加光纖?
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來源:金環宇電線發(fa)布日(ri)期(qi):2020-04-01 14:58
光(guang)(guang)(guang)纜和同軸(zhou)電纜是(shi)兩種不同的(de)產品。簡單的(de)說同軸(zhou)電纜和光(guang)(guang)(guang)纜最大(da)區別(bie)就在于傳(chuan)輸速度,光(guang)(guang)(guang)纜比同軸(zhou)電纜快很多(duo),當然光(guang)(guang)(guang)纜是(shi)目(mu)前傳(chuan)輸速度最快的(de)一(yi)種介(jie)質.
同(tong)(tong)軸(zhou)電(dian)(dian)纜(lan)(lan)(lan)由一(yi)(yi)(yi)空(kong)心金(jin)屬(shu)圓管(外(wai)導(dao)體)和(he)一(yi)(yi)(yi)根硬銅導(dao)線(內導(dao)體)組成。內導(dao)體位于(yu)(yu)金(jin)屬(shu)圓管中 心,內外(wai)導(dao)體間用(yong)聚乙烯塑料墊片絕緣。在(zai)局域網(wang)中使(shi)用(yong)的同(tong)(tong)軸(zhou)電(dian)(dian)纜(lan)(lan)(lan)共(gong)有75Ω、50Ω 和(he)93Ω三(san)種。RG59型75Ω電(dian)(dian)纜(lan)(lan)(lan)是共(gong)用(yong)天(tian)線電(dian)(dian)視系統(CATV)采用(yong)的標(biao)準電(dian)(dian)纜(lan)(lan)(lan),它常用(yong)于(yu)(yu)傳輸(shu)(shu)(shu)頻 分(fen)多路FDM方式產生的模擬(ni)信(xin)(xin)號,頻率可達300~400MHz,稱作寬帶傳輸(shu)(shu)(shu),也可用(yong)于(yu)(yu)傳輸(shu)(shu)(shu)數字(zi)信(xin)(xin)號。50Ω同(tong)(tong)軸(zhou)電(dian)(dian)纜(lan)(lan)(lan)分(fen)粗纜(lan)(lan)(lan)(RG-8型或(huo)RG-11型)和(he)細纜(lan)(lan)(lan)(RG-58型)兩種。粗纜(lan)(lan)(lan)抗干擾(rao)性能(neng) 好,傳輸(shu)(shu)(shu)距(ju)(ju)離(li)較遠,細纜(lan)(lan)(lan)價格低,傳輸(shu)(shu)(shu)距(ju)(ju)離(li)較近,傳輸(shu)(shu)(shu)速率一(yi)(yi)(yi)般為10Mbps,適用(yong)于(yu)(yu)以及(ji)網(wang)。 RG-62型93Ω電(dian)(dian)纜(lan)(lan)(lan)是Arcnet網(wang)采用(yong)的同(tong)(tong)軸(zhou)電(dian)(dian)纜(lan)(lan)(lan),通常只適用(yong)于(yu)(yu)基(ji)帶傳輸(shu)(shu)(shu),傳輸(shu)(shu)(shu)速率為2~20M bps。
光(guang)纜是光(guang)纖(xian)電纜的簡稱(cheng),是傳送(song)光(guang)信(xin)號(hao)的介質,它由纖(xian)芯(xin)、包層(ceng)(ceng)和外部一層(ceng)(ceng)的增強強度(du)的保護層(ceng)(ceng)構成(cheng)。纖(xian)芯(xin)是采用(yong)二(er)氧(yang)化硅摻(chan)以鍺、磷等材料制成(cheng),呈(cheng)圓柱形。外面(mian)包層(ceng)(ceng)用(yong)純二(er)氧(yang)化硅制成(cheng),它將光(guang)信(xin)號(hao)折射(she)到(dao)纖(xian)芯(xin)中(zhong)。光(guang)纖(xian)分單(dan)模(mo)(mo)和多(duo)模(mo)(mo)兩種,單(dan)模(mo)(mo)只提供(gong)一條光(guang)通(tong)路,多(duo)模(mo)(mo)有多(duo)條光(guang)通(tong)路,單(dan)模(mo)(mo)光(guang)纖(xian)容量(liang)大,價(jia)格(ge)較貴,目(mu)前單(dan)模(mo)(mo)光(guang)纖(xian)芯(xin)連包層(ceng)(ceng)尺寸約8.3μm/125μm, 多(duo)模(mo)(mo)纖(xian)芯(xin)常用(yong)的為62.5μm/125μm。光(guang)纖(xian)只能作單(dan)向傳輸(shu),如(ru)需(xu)雙向通(tong)信(xin),則應成(cheng)對(dui)使(shi)用(yong) 。國內的光(guang)纜服務速度(du)已經達到(dao)100Mbps,而服務商表示最終將把(ba)該(gai)數字提高(gao)到(dao)1Gbps到(dao)10Gbps