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</span>中國(guó)(山東)自由貿(mào)易試驗(yàn)區(qū)煙臺(tái)片區(qū)煙臺(tái)開(kāi)發(fā)區(qū)珠江路42號(hào)</p><p>[當(dāng)前離線(xiàn)] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="jpdjhtr" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="z5vjp5r" class="box"><p><p style="text-indent:25px">模擬光端機(jī)采用了PFM調(diào)制技術(shù)實(shí)時(shí)傳輸圖象信號(hào)。發(fā)射端將模擬視頻信號(hào)先進(jìn)行PFM調(diào)制后，再進(jìn)行電-光轉(zhuǎn)換，光信號(hào)傳到接收端后，進(jìn)行光-電轉(zhuǎn)換，然后進(jìn)行PFM解調(diào)，江蘇網(wǎng)絡(luò)光端機(jī)工作原理，恢復(fù)出視頻信號(hào)。由于采用了PFM調(diào)制技術(shù)，其傳輸距離能達(dá)到50Km或者更遠(yuǎn)，江蘇網(wǎng)絡(luò)光端機(jī)工作原理。通過(guò)使用波分復(fù)用技術(shù)，還可以在一根光纖上實(shí)現(xiàn)圖象和數(shù)據(jù)信號(hào)的雙向傳輸，滿(mǎn)足監(jiān)控工程的實(shí)際需求。這種模擬光端機(jī)也存在一些缺點(diǎn): a)生產(chǎn)調(diào)試較困難; b)單根光纖實(shí)現(xiàn)多路圖象傳輸較困難，性能會(huì)下降，江蘇網(wǎng)絡(luò)光端機(jī)工作原理，這種模擬光端機(jī)一般只能做到單根光纖上傳輸4路圖象; c)抗干擾能力差，受環(huán)境因素影響較大，有溫漂; d)由于采用的是模擬調(diào)制解調(diào)技術(shù)，其穩(wěn)定性不夠高，隨著使用時(shí)間的增加或環(huán)境特性的變化，光端機(jī)的性能也會(huì)發(fā)生變化，給工程使用帶來(lái)一些不便。光端機(jī)是用來(lái)將光信號(hào)和電信號(hào)互相轉(zhuǎn)換的一種設(shè)備,對(duì)所傳信號(hào)不會(huì)進(jìn)行任何壓縮.江蘇網(wǎng)絡(luò)光端機(jī)工作原理</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="江蘇網(wǎng)絡(luò)光端機(jī)工作原理,光端機(jī)" src="https://tyunfile.71360.com/WaterMark/UploadFile/zhengwei123/637469289012058980/8102049.png"></div><p style="text-indent:25px">根據(jù)光纖傳輸網(wǎng)絡(luò)拓?fù)湫褪匠蛇x擇傳統(tǒng)的點(diǎn)對(duì)點(diǎn)傳輸光端機(jī)外，還有節(jié)點(diǎn)式和環(huán)網(wǎng)式光端機(jī)可供選擇。節(jié)點(diǎn)式視頻光端機(jī)將前端各節(jié)點(diǎn)組成鏈網(wǎng)或樹(shù)型網(wǎng)絡(luò)，節(jié)點(diǎn)機(jī)在每個(gè)節(jié)點(diǎn)首先將信號(hào)接收下來(lái)，轉(zhuǎn)換成電信號(hào)，再和本地節(jié)點(diǎn)的信號(hào)交換復(fù)用，光電轉(zhuǎn)換后采用WDM技術(shù)復(fù)用到一條光纖上傳輸。在每個(gè)節(jié)點(diǎn)不進(jìn)行模數(shù)轉(zhuǎn)換，降低了信號(hào)衰減。環(huán)網(wǎng)式光端機(jī)將各主要節(jié)點(diǎn)連成環(huán)網(wǎng)，并且通過(guò)光分支的型式還可以有星型分支，可以做到網(wǎng)絡(luò)拓?fù)涞碾S意性，做到全網(wǎng)信息的共享等許多獨(dú)特的功能。多?；騿文９饫|，光纖網(wǎng)絡(luò)是由多?；騿文９饫|組成，這就決定了選用多模端機(jī)還是單模端機(jī)。如果新建項(xiàng)目，建議優(yōu)先使用視橋光網(wǎng)綜合業(yè)務(wù)光端機(jī)，單模光纖和單模光端機(jī)。相對(duì)于多模光纖，單模光纖傳輸距離更遠(yuǎn)、信息容量更大、速度更快。甘肅環(huán)網(wǎng)光端機(jī)與光纖收發(fā)器區(qū)別數(shù)字光端機(jī)傳輸距離較長(zhǎng):可達(dá)80Km，甚至更遠(yuǎn)(120Km)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="江蘇網(wǎng)絡(luò)光端機(jī)工作原理,光端機(jī)" src="https://tyunfile.71360.com/WaterMark/UploadFile/zhengwei123/637469287695276175/6086715.png"></div><p style="text-indent:25px">目前國(guó)內(nèi)視頻光端機(jī)生產(chǎn)企業(yè)主要有3類(lèi)。一類(lèi)是依靠較強(qiáng)的光通信技術(shù)立足的通信企業(yè)，這些企業(yè)技術(shù)基礎(chǔ)較好，企業(yè)規(guī)模大多數(shù)屬于中等(年銷(xiāo)售額在5000萬(wàn)左右)，這一類(lèi)也包括兼營(yíng)視頻光端機(jī)的通信廠(chǎng)家，他們是這個(gè)子行業(yè)的重點(diǎn)企業(yè)。一類(lèi)是一些安防行業(yè)中規(guī)模較大的綜合性視頻監(jiān)控廠(chǎng)家，視頻光端機(jī)只是其產(chǎn)品鏈中的一環(huán)，這類(lèi)企業(yè)規(guī)模較大、綜合技術(shù)實(shí)力較強(qiáng)，視頻光端機(jī)在其產(chǎn)值的比重多少不一。第三類(lèi)是加工型企業(yè)，數(shù)目較多。由于光端機(jī)行業(yè)技術(shù)門(mén)檻較低，一兩個(gè)從光通訊企業(yè)離職的設(shè)計(jì)開(kāi)發(fā)人員就能成立一家企業(yè)，以小作坊的方式組裝生產(chǎn)視頻光端機(jī)，視頻光端機(jī)是其主要產(chǎn)品，在這類(lèi)企業(yè)中仿冒產(chǎn)品盛行。</p><p style="text-indent:25px">用戶(hù)在使用光端機(jī)時(shí)還可能遇到?jīng)]有控制信號(hào)或者控制信號(hào)不正常，這個(gè)時(shí)候產(chǎn)品手冊(cè)就可以排上用場(chǎng)了，對(duì)照產(chǎn)品手冊(cè)數(shù)據(jù)端口定義檢查數(shù)據(jù)線(xiàn)是否連接正確且牢固可靠。特別是控制線(xiàn)的正負(fù)極有沒(méi)有接反。　　光端機(jī)，就是將多個(gè)E1（一種中繼線(xiàn)路的數(shù)據(jù)傳輸標(biāo)準(zhǔn)，通常速率為2.048Mbps，此標(biāo)準(zhǔn)為中國(guó)和歐洲采用）信號(hào)變成光信號(hào)并傳輸?shù)脑O(shè)備。光端機(jī)根據(jù)傳輸E1口數(shù)量的多少，價(jià)格也不同。一般較小的光端機(jī)可以傳輸4個(gè)E1，目前較大的光端機(jī)可以傳輸4032個(gè)E1。模擬視頻光端機(jī)與數(shù)字光端機(jī)穩(wěn)定性不同。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="江蘇網(wǎng)絡(luò)光端機(jī)工作原理,光端機(jī)" src="https://tyunfile.71360.com/WaterMark/UploadFile/zhengwei123/637469287259766811/5815066.png"></div><p style="text-indent:25px">模擬光端機(jī)與數(shù)字光端機(jī)處理方式的不同，引起的視頻、音頻、數(shù)據(jù)信號(hào)信號(hào)失真、變畸變、干擾不同。模擬光端機(jī)由于要進(jìn)行調(diào)幅、調(diào)頻、調(diào)相，所以模擬信號(hào)的幅度的變化與載波信號(hào)因調(diào)制而引起的幅度變化是否為一一對(duì)應(yīng)的線(xiàn)形關(guān)系成為擬光端機(jī)質(zhì)量好壞的關(guān)鍵，到目前為止，很難做到真正線(xiàn)性調(diào)制，非線(xiàn)形必同時(shí)調(diào)制好的載波信號(hào)還要調(diào)制光信號(hào)，光信號(hào)的非線(xiàn)性也是一個(gè)非常重要的因素，眾所周知，光器件的非線(xiàn)性工作電壓的穩(wěn)定性、光發(fā)射功率有很大的影響，因此光器件在生產(chǎn)時(shí)需進(jìn)行7-10天的熱循環(huán)老化等等工藝選只能做到將這種變換控制在一定的范圍；光信號(hào)在光纖中長(zhǎng)距離傳輸，會(huì)引起光信號(hào)的功率衰減，傳輸頻率漂移信號(hào)色散效應(yīng)同樣也會(huì)引起光信號(hào)畸變；光信號(hào)到達(dá)接收端，接收光器件仍然要引起非線(xiàn)性失真，由光電轉(zhuǎn)換后解調(diào)，解調(diào)與調(diào)制一樣會(huì)產(chǎn)生非線(xiàn)性畸變。所以綜合模擬光端機(jī)，從輸入信號(hào)調(diào)制-電光轉(zhuǎn)換-光輸出-光電轉(zhuǎn)換-都會(huì)引起非線(xiàn)形失真，而這些信號(hào)畸變失真是固有的，所以也必然是不可消除的，因此模擬光端機(jī)傳輸視頻圖象據(jù)的效果很難達(dá)到很滿(mǎn)意的效果。數(shù)字式光端機(jī)只是只有模數(shù)轉(zhuǎn)換的量化誤差(如1V視頻信號(hào)12bits時(shí)只是為2起信號(hào)畸變。視頻光端機(jī)就是把1到多路的模擬視頻信號(hào)通過(guò)各種編碼轉(zhuǎn)換成光信號(hào)通過(guò)光纖介質(zhì)來(lái)傳輸?shù)脑O(shè)備。北京PDH光端機(jī)報(bào)價(jià)</p><p style="text-indent:25px">模擬調(diào)頻、調(diào)幅、調(diào)相光端機(jī)在市場(chǎng)初期的傳輸方式是將基帶的視頻、音頻、數(shù)據(jù)等信號(hào)調(diào)制在某一載頻上。江蘇網(wǎng)絡(luò)光端機(jī)工作原理</p><p style="text-indent:25px">光口連接型式，視頻光端機(jī)與光纖網(wǎng)絡(luò)的連接頭可分為:FC、SC、ST、LC、D4、DIN、MU、MT 等型式，按光纖端面形狀分有FC、PC(包括SPC 或UPC)和APC 等類(lèi)型。目前應(yīng)用較廣的只有FC、SC 和ST 三種。一般長(zhǎng)距離或大容量通信大多使用FC或SC 型連接器，其優(yōu)點(diǎn)是插入損失小、安裝容易、穩(wěn)定性高。其中又以FC連接頭更好，由于它采用螺紋緊固，能提供穩(wěn)定可靠的連接。SC 連接頭是插撥式的，多次插拔之后連接頭的可靠性會(huì)降低。短距離信號(hào)傳輸則較多用ST 型連接器，且多用于多模系統(tǒng)，因?yàn)槠渚纫蟛桓?，成本也就較低。江蘇網(wǎng)絡(luò)光端機(jī)工作原理</p><p style="text-indent:25px">煙臺(tái)市正維通信技術(shù)有限公司是一家目前正維通信的用戶(hù)已遍布電力、煤礦、軌道交通、高速公路、鋼鐵冶金、石油化工、城市智能交通、水處理等行業(yè)，正維通信通過(guò)覆蓋國(guó)內(nèi)30個(gè)省、市、自治區(qū)的銷(xiāo)售機(jī)構(gòu)和數(shù)十個(gè)重要的合作伙伴，使迅速響應(yīng)用戶(hù)需求成為現(xiàn)實(shí)，向客戶(hù)提供完善的售前支持和貼心的售后服務(wù)。的公司，致力于發(fā)展為創(chuàng)新務(wù)實(shí)、誠(chéng)實(shí)可信的企業(yè)。公司自創(chuàng)立以來(lái)，投身于工業(yè)交換機(jī)，以太網(wǎng)交換機(jī)，環(huán)網(wǎng)交換機(jī)，光纖收發(fā)器，是通信產(chǎn)品的主力軍。煙臺(tái)正維通信技術(shù)不斷開(kāi)拓創(chuàng)新，追求出色，以技術(shù)為先導(dǎo)，以產(chǎn)品為平臺(tái)，以應(yīng)用為重點(diǎn)，以服務(wù)為保證，不斷為客戶(hù)創(chuàng)造更高價(jià)值，提供更優(yōu)服務(wù)。煙臺(tái)正維通信技術(shù)始終關(guān)注通信產(chǎn)品行業(yè)。滿(mǎn)足市場(chǎng)需求，提高產(chǎn)品價(jià)值，是我們前行的力量。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/3070566.html</p></div></div></div></div></div><div id="r5dbjpd" class="page-right twoColRt"><div id="fbjhpdt" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="b7pnl3d" class="recomPic likePro"><a 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