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id="tdanpc8" class="twoCol"><div id="rlda32c" class="page-proshow clearfix"><p class="current"> 當(dāng)前位置:<a href="http://www.cdcfah.com/">首頁?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應(yīng)</a>?<a href="http://www.cdcfah.com/cp/first-_txcp/">通信產(chǎn)品</a>?<a href="http://www.cdcfah.com/cp/second-txcp_csjhsb/">傳輸、交換設(shè)備</a>?<a href="http://www.cdcfah.com/cp/third-csjhsb_gdjlh/">光端機</a>?浙江華為EFS4以太網(wǎng)板深圳市騰云科創(chuàng)供應(yīng)「深圳市騰云科創(chuàng)供應(yīng)」</p><div id="mbdaczv" class="leftbox clearfix"><h1>浙江華為EFS4以太網(wǎng)板深圳市騰云科創(chuàng)供應(yīng)「深圳市騰云科創(chuàng)供應(yīng)」</h1><div id="xro3bqx" class="proBig"><div id="nspe3yk" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637242902003447265/4782887.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="zebnkmd" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637242902003447265/4782887.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="3surtqc" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>廣東省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>浙江華為EFS4以太網(wǎng)板</p><p><span>***更新：</span>2020-08-08 05:45:09</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="hrj3zrd" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">深圳市騰云科創(chuàng)信息咨詢有限公司</a></p><p><span>聯(lián)系人：</span>夏永 </p><p><span>郵箱: </span>87993378@qq.com</p><p><span>電話: </span>16625147809</p><p><span>傳真: </span>1550_</p><p><span>網(wǎng)址: </span></p><p><span>手機: </span>1550-2042477</p><p><span>地址: </span>沙井街道蠔四社區(qū)街尾塘一巷5號幸福家園A棟、B棟、C棟、D棟D棟110D</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="dx3hwtu" class="page-proshow02"><p class="title">詳細說明</p><div id="mwtvczl" class="box"><p><p>光纖通信技術(shù)的特點--損耗低,中繼距離長。目前實用石英光纖的損耗可低于0.2dB/km,比其他任何傳輸介質(zhì)的損耗都低,若將來采用非石英系極低損耗光纖,其理論分析損耗可下降至109dB/km。由于光纖的損耗低,所以能實現(xiàn)中繼距離長,由石英光纖組成的光纖通信系統(tǒng)比較大中繼距離可達200多千米,由非石英系極低損耗光纖組成的通信系統(tǒng),其比較大中繼距離則可達數(shù)千甚至數(shù)萬千米,這意味著通過光纖通信系統(tǒng)可以跨越更大的無中繼距離,對于一個長途傳輸線路,由于中繼站數(shù)目的減少,系統(tǒng)成本和復(fù)雜性可**降低。</p><p><img src="https://tyunfile.71360.com/UploadFile/sztykc/637242902007998046/6082480.jpg" /></p><p>光纖在光傳輸中的應(yīng)用根據(jù)傳輸設(shè)備的不同,光纖線路在光傳輸網(wǎng)絡(luò)中主要有兩種應(yīng)用:一種為數(shù)字傳輸,一般為PDH、SDH制式。PDH目前較少用于廣播電視傳輸,多用于數(shù)據(jù)傳輸。SDH多用于組建干線傳輸網(wǎng),也是目前廣電系統(tǒng)采用的傳統(tǒng)模式。另一種為AM模擬傳輸,AM模擬有線電視光傳輸系統(tǒng)又可分為直接調(diào)制調(diào)幅和外調(diào)制調(diào)幅系統(tǒng)。直接調(diào)制調(diào)幅系統(tǒng)是半導(dǎo)體、激勵器直接將光強度調(diào)制,將調(diào)頻電信號轉(zhuǎn)換成調(diào)幅光信號進行傳輸。(DFB)激勵器,其光譜線窄、線性好、輸出功率高、光波長為1310nm,目前使用**多,適用于中短距離傳輸。為廣播電視系統(tǒng)傳輸?shù)闹鞴饫w的連接分為熔接和磨接,無論何種連接都會產(chǎn)生接頭損耗。1310nm的光纖衰減系數(shù)為0.35dB/km。無論信號傳輸遠近,光纜的連接都需要進行光纖熔接,其接頭熔接損耗一般在0.05dB以下。因此在計算光纖自動損耗時還應(yīng)考慮接頭和其他損耗(2km一般取1dB)。</p><p><img src="https://tyunfile.71360.com/UploadFile/sztykc/637242898969345703/9897699.jpg" /></p><p>深圳騰云科創(chuàng)信息咨詢有限公司，成立于2015年專業(yè)從事通信產(chǎn)品購銷以及施工，維護，產(chǎn)品維修，計算機系統(tǒng)集成施工。公司擁有專業(yè)的技術(shù)團隊，由廠家(中興通訊，華為技術(shù)，烽火通信)服務(wù)10年以上從業(yè)經(jīng)驗的技術(shù)****，并有多名專業(yè)技術(shù)人員為您提供專業(yè)的商務(wù)技術(shù)和專業(yè)解決方案。公司主營中興通訊及華為技術(shù)各系列產(chǎn)品板件及整套設(shè)備的銷售與安裝，設(shè)備維護及板件返修，以及各設(shè)備可配置的單板，用戶電纜，中繼電纜等。公司業(yè)務(wù)涉及交通、金融、教育、衛(wèi)生、科研等系統(tǒng)已經(jīng)建立了牢固的業(yè)務(wù)合作伙伴關(guān)系。積極面向市場為廣大行業(yè)用戶提供設(shè)計、安裝、調(diào)試、培訓(xùn)、維護的“一條龍"服務(wù)。本公司以質(zhì)量的服務(wù)、良好的信譽、雄厚的技術(shù)力量為廣大客戶提供質(zhì)量服務(wù)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="浙江華為EFS4以太網(wǎng)板" src="https://tyunfile.71360.com/UploadFile/sztykc/637242902003447265/4782887.jpg"></div></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/845477.html</p></div></div></div></div></div><div id="8tvx3pr" class="page-right twoColRt"><div id="pegipwy" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="isegi7b" 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