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id="uayesw8" class="proBig"><div id="s0wsqws" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101923829/7728521.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="e20ecae" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101923829/7728521.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="gukayc8" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>新疆銷售光傳輸設(shè)備烽火Citrans 550F,烽火</p><p><span>***更新：</span>2021-02-01 03:06:11</p><p><span id="click" >瀏覽次數(shù)：2次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="agmmaye" 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(jī): </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(hào)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="esigok0" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="com8mkq" class="box"><p><p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> 電源系統(tǒng)SDH設(shè)備采用一48伏直流電源，工作電壓應(yīng)滿足：輸入電壓范圍是-40V至-57V；電話衡量雜音電壓<2mV；峰峰值雜音電壓(0．300Hz)_<400mV，新疆銷售光傳輸設(shè)備烽火Citrans 550F。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> 根據(jù)公式：電流=功率／電壓。各設(shè)備正常工作時(shí)的比較大電流等于滿配置功耗除以工作電壓。比較大電流再加上適當(dāng)富余量取整可得所需熔絲大小。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> 時(shí)鐘同步系統(tǒng)</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">SDH網(wǎng)元時(shí)鐘源的種類</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">(1)外部時(shí)鐘源——由SETPI功能塊提供輸入接口；</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">(2)線路時(shí)鐘源一由SPI功能塊從STM．N線路信號(hào)中提??；</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">(3)支路時(shí)鐘源——由PPI功能塊從PDH支路信號(hào)中提取，新疆銷售光傳輸設(shè)備烽火Citrans 550F，新疆銷售光傳輸設(shè)備烽火Citrans 550F，不過該時(shí)鐘一般不用，因?yàn)镾DH／PDH網(wǎng)邊界處的指針調(diào)整會(huì)影響時(shí)鐘質(zhì)量；</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">(4)設(shè)備內(nèi)置時(shí)鐘源由SETS功能塊提供。</span> </p> <p> <br /> </p> <p> <br /> 由于SDH有多種網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)，它所組成的網(wǎng)絡(luò)非常靈活。新疆銷售光傳輸設(shè)備烽火Citrans 550F</p> <span style="font-size:16px;font-family:"Microsoft YaHei";"></span><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="新疆銷售光傳輸設(shè)備烽火Citrans 550F,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101923829/7728521.jpg"></div><p> SDH網(wǎng)絡(luò)的常見網(wǎng)元和功能 </p> <p> ADM——分/插復(fù)用器 </p> <p> 分/插復(fù)用器用于SDH傳輸網(wǎng)絡(luò)的轉(zhuǎn)接站點(diǎn)處，例如鏈的中間結(jié)點(diǎn)或環(huán)上結(jié)點(diǎn)，是SDH網(wǎng)上使用比較多、比較重要的一種網(wǎng)元，它是一個(gè)三端口的器件。 </p> <p> ADM有兩個(gè)線路端口和一個(gè)支路端口。兩個(gè)線路端口各接一側(cè)的光纜（每側(cè)收/發(fā)共兩根光纖），為了描述方便我們將其分為西（W）向、東向（E）兩個(gè)線路端口。ADM的作用是將低速支路信號(hào)交叉復(fù)用進(jìn)東或西向線路上去，或從東或西側(cè)線路端口收的線路信號(hào)中拆分出低速支路信號(hào)。另外，還可將東/西向線路側(cè)的STM-N信號(hào)進(jìn)行交叉連接，例如將東向STM-16中的3#STM-1與西向STM-16中的15#STM-1相連接。 </p> <p> ADM是SDH比較重要的一種網(wǎng)元，通過它可等效成其它網(wǎng)元，即能完成其它網(wǎng)元的功能，例如：一個(gè)ADM可等效成兩個(gè)TM。云南SDH光傳輸設(shè)備烽火IBAS 180在各種寬帶光纖接入網(wǎng)技術(shù)中，采用SDH技術(shù)的接入網(wǎng)系統(tǒng)是應(yīng)用最普遍的。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="新疆銷售光傳輸設(shè)備烽火Citrans 550F,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845102001954/2472236.jpg"></div><p> <span style="font-size:16px;font-family:"Microsoft YaHei";">SDH的復(fù)用包括兩種情況：</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">1、由STM-1信號(hào)復(fù)用成STM-N信號(hào)</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">復(fù)用的方法主要通過字節(jié)間插的同步復(fù)用方式來完成的，復(fù)用的基數(shù)是4，即4×STM-1→STM-4，4×STM-4→STM-16。在復(fù)用過程中保持幀頻不變（8000幀/秒），這就意味著高一級(jí)的STM-N信號(hào)是低一級(jí)的STM-n信號(hào)速率的4倍。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">在進(jìn)行字節(jié)間插復(fù)用過程中，各幀的信息凈負(fù)荷和指針字節(jié)按原值進(jìn)行字節(jié)間插復(fù)用，而STM-N的段開銷并不是由所有低階STM-N幀中的段開銷間插復(fù)用而成，而是舍棄了某些低階幀中的段開銷。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">2、由PDH支路信號(hào)復(fù)用成STM-N信號(hào)</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">各種PDH支路信號(hào)復(fù)用進(jìn)STM-N幀的過程都要經(jīng)歷映射、定位、復(fù)用三個(gè)步驟。映射相當(dāng)于信號(hào)打包，定位伴隨與指針調(diào)整，復(fù)用相當(dāng)于字節(jié)間插復(fù)用。ITU-T規(guī)定了一整套完整的映射復(fù)用結(jié)構(gòu)，也就是映射復(fù)用路線，通過這些路線可將PDH的3個(gè)系列的數(shù)字信號(hào)以多種方法復(fù)用成STM-N信號(hào)。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">復(fù)用結(jié)構(gòu)包括了一些基本的復(fù)用單元：C－容器、VC－虛容器、TU－支路單元、TUG－支路單元組、AU－管理單元、AUG－管理單元組，這些復(fù)用單元的下標(biāo)表示與此復(fù)用單元相應(yīng)的信號(hào)級(jí)別。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";">從一個(gè)有效負(fù)荷到STM-N的復(fù)用路線不是的，有多條路線（也就是說有多種復(fù)用方法），8Mbit/s的PDH支路信號(hào)是無法復(fù)用成STM-N信號(hào)的。</span> </p> <p> <br /> </p> <p> <br /> </p><p> SDH的概念 </p> <p> SDH[1]（Synchronous Digital Hierarchy，同步數(shù)字系列）光端機(jī)容量較大，一般是16E1到4032E1。 SDH是一種將復(fù)接、線路傳輸及交換功能融為一體、并由統(tǒng)一網(wǎng)管系統(tǒng)操作的綜合信息傳送網(wǎng)絡(luò)，是美國貝爾通信技術(shù)研究所提出來的同步光網(wǎng)絡(luò)（SONET）。國際電話電報(bào)咨詢**會(huì)（CCITT）（現(xiàn)ITU-T）于1988年接受了SONET 概念并重新命名為SDH，使其成為不但適用于光纖也適用于微波和衛(wèi)星傳輸?shù)耐ㄓ眉夹g(shù)體制。它可實(shí)現(xiàn)網(wǎng)絡(luò)有效管理、實(shí)時(shí)業(yè)務(wù)監(jiān)控、動(dòng)態(tài)網(wǎng)絡(luò)維護(hù)、不同廠商設(shè)備間的互通等多項(xiàng)功能，能**提高網(wǎng)絡(luò)資源利用率、降低管理及維護(hù)費(fèi)用、實(shí)現(xiàn)靈活可靠和***的網(wǎng)絡(luò)運(yùn)行與維護(hù)，因此是當(dāng)今世界信息領(lǐng)域在傳輸技術(shù)方面的發(fā)展和應(yīng)用的熱點(diǎn)，受到人們的***重視。 </p> <p> <br /> </p> <p> <br /> 網(wǎng)絡(luò)節(jié)點(diǎn)設(shè)備（網(wǎng)元）和傳輸線路的幾何排列就構(gòu)成了網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="新疆銷售光傳輸設(shè)備烽火Citrans 550F,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244847724550782/6753357.jpg"></div><p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> SDH的發(fā)展趨勢</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> SDH作為新一代理想的傳輸體系，具有路由自動(dòng)選擇能力，上下電路方便，維護(hù)、控制、管理功能強(qiáng)，標(biāo)準(zhǔn)統(tǒng)一，便于傳輸更高速率的業(yè)務(wù)等優(yōu)點(diǎn)，能很好地適應(yīng)通信網(wǎng)飛速發(fā)展的需要。迄今，SDH得到了空前的應(yīng)用與發(fā)展。在標(biāo)準(zhǔn)化方面，已建立和即將建立的一系列建議已基本上覆蓋了SDH的方方面面。在干線網(wǎng)和長途網(wǎng)、中繼網(wǎng)、接入網(wǎng)中它開始廣泛應(yīng)用。且在光纖通信、微波通信、衛(wèi)星通信中也積極地開展研究與應(yīng)用。</span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> </span> </p> <p> <span style="font-size:16px;font-family:"Microsoft YaHei";"> 近些年，點(diǎn)播電視、多媒體業(yè)務(wù)和其他寬帶業(yè)務(wù)如雨后春筍般紛紛出現(xiàn)，為SDH應(yīng)用在接入網(wǎng)中提供了廣闊的空間。SDH技術(shù)應(yīng)用于接入網(wǎng)的好處是：1）對于要求高可靠、高質(zhì)量業(yè)務(wù)的大型企事業(yè)用戶，SDH可以提供較為理想的網(wǎng)絡(luò)性能和業(yè)務(wù)可靠性。2）可以將網(wǎng)管范圍擴(kuò)展至用戶端，簡化維護(hù)工作。3）利用SDH固有靈活性，可使網(wǎng)絡(luò)運(yùn)營者更快、更有效地提供用戶所需的長期和短期業(yè)務(wù)需求。</span> </p> <p> <br /> </p> <p> <br /> </p> <p> <br /> </p> <p> <br /> </p> <p> <br /> </p> <p> <br /> 標(biāo)準(zhǔn)的開放型光接口可以在基本光纜段上實(shí)現(xiàn)橫向兼容，降低了聯(lián)網(wǎng)成本。西藏光端機(jī)烽火 E1板卡</p><p style="text-indent:25px">從OSI模型的觀點(diǎn)來看，SDH屬于其比較低層的物理層。新疆銷售光傳輸設(shè)備烽火Citrans 550F</p><p> SDH的應(yīng)用 </p> <p> 由于以上所述的SDH的眾多特性，使其在廣域網(wǎng)領(lǐng)域和專門用途網(wǎng)領(lǐng)域得到了巨大的發(fā)展。中國移動(dòng)、電信、聯(lián)通、廣電等電信運(yùn)營商都已經(jīng)大規(guī)模建設(shè)了基于SDH的骨干光傳輸網(wǎng)絡(luò)。利用大容量的SDH環(huán)路承載IP業(yè)務(wù)、ATM業(yè)務(wù)或直接以租用電路的方式出租給企、事業(yè)單位。而一些大型的專門用途網(wǎng)絡(luò)也采用了SDH技術(shù)，架設(shè)系統(tǒng)內(nèi)部的SDH光環(huán)路，以承載各種業(yè)務(wù)。比如電力系統(tǒng)，就利用SDH環(huán)路承載內(nèi)部的數(shù)據(jù)、遠(yuǎn)控、視頻、語音等業(yè)務(wù)。 </p> <p> 而對于組網(wǎng)更加迫切、而又沒有可能架設(shè)專門用途SDH環(huán)路的單位，很多都采用了租用電信運(yùn)營商電路的方式。由于SDH基于物理層的特點(diǎn)，單位可在租用電路上承載各種業(yè)務(wù)而不受傳輸?shù)南拗?。承載方式有很多種，可以是利用基于TDM技術(shù)的綜合復(fù)用設(shè)備實(shí)現(xiàn)多業(yè)務(wù)的復(fù)用，也可以利用基于IP的設(shè)備實(shí)現(xiàn)多業(yè)務(wù)的分組交換。SDH技術(shù)可真正實(shí)現(xiàn)租用電路的帶寬保證，安全性方面也優(yōu)于VPN等方式。在和對安全性非常注重的企業(yè)，SDH租用線路得到了***的應(yīng)用。一般來說，SDH可提供E1、E3、STM-1或STM-4等接口，完全可以滿足各種帶寬要求。同時(shí)在價(jià)格方面，也已經(jīng)為大部分單位所接受。新疆銷售光傳輸設(shè)備烽火Citrans 550F</p><p 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