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class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105000000/3722756.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="8qcykbn" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105000000/3722756.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="pdfgdub" 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>海南光傳輸設(shè)備SDH烽火STM-4,烽火</p><p><span>***更新：</span>2020-09-03 20:14:25</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="c3cz74k" 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="txkmt8y" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="fofwiz2" class="box"><p><p> 隨著科學(xué)技術(shù)的不斷發(fā)展,各行各業(yè)為了滿足自身內(nèi)部的需求，將會(huì)建設(shè)更多，更復(fù)雜的**網(wǎng)絡(luò)，這些網(wǎng)絡(luò)必將承擔(dān)更多的任務(wù)。 </p> <p> 對(duì)于大多數(shù)專網(wǎng)，在目前的技術(shù)條件下，則應(yīng)利用公眾網(wǎng)實(shí)現(xiàn)企業(yè)或?qū)I(yè)部門的通信需求。利用公眾網(wǎng)滿足專業(yè)部門的需求具有各種不同的方式。如租用公眾網(wǎng)的光芯或傳輸容量，配置自己的交換設(shè)備。這就免除了**困難的光纜輔設(shè)工程，比較適用于具有大規(guī)模用戶的企業(yè)，海南光傳輸設(shè)備SDH烽火STM-4。又如委托公眾網(wǎng)**為本企業(yè)或部門使用的虛擬**網(wǎng)，它所提供的功能和容量完全按照用戶的要求進(jìn)行，這就免除了全部的投資風(fēng)險(xiǎn)和維護(hù)工作，海南光傳輸設(shè)備SDH烽火STM-4，應(yīng)用機(jī)動(dòng)靈活，海南光傳輸設(shè)備SDH烽火STM-4，使用部門可以專心致力于其本行業(yè)的業(yè)務(wù)工作。 </p> <p> <br /> 由于幀周期的恒定使STM-N信號(hào)的速率有其規(guī)律性。海南光傳輸設(shè)備SDH烽火STM-4</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="海南光傳輸設(shè)備SDH烽火STM-4,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845105000000/3722756.jpg"></div><p> 隨著骨干傳輸容量不斷增大，城域傳輸網(wǎng)絡(luò)的接入能力也多樣化。但以IP為主的網(wǎng)絡(luò)業(yè)務(wù)仍然是不可預(yù)知的，這需要傳輸網(wǎng)絡(luò)具有更好的自適應(yīng)能力，而這種自適應(yīng)能力不**是網(wǎng)絡(luò)接口或網(wǎng)絡(luò)容量的適應(yīng)能力，而且要求網(wǎng)絡(luò)連接的自適應(yīng)能力?？偟膩碚f，低成本、靈活快速的完成運(yùn)營商端局到用戶端的業(yè)務(wù)接入和業(yè)務(wù)收斂是對(duì)未來城域網(wǎng)接入系統(tǒng)的主要需求。 </p> <p> 簡單地講，這種采用SDH傳輸以太網(wǎng)等多種業(yè)務(wù)的方式就是將不同的網(wǎng)絡(luò)層次的業(yè)務(wù)通過ＶＣ級(jí)聯(lián)的方式映射到SDH電路的各個(gè)時(shí)隙中，由SDH網(wǎng)絡(luò)提供完全透明的傳輸通道，從物理層的設(shè)備角度上看是一個(gè)集成的整體。這種解決方案可以大幅度地降低投資規(guī)模，減少設(shè)備占地面積，降低功耗，進(jìn)而降低網(wǎng)絡(luò)運(yùn)營商的運(yùn)營成本。同時(shí)，提供多業(yè)務(wù)的能力還可以使網(wǎng)絡(luò)運(yùn)營商能夠快速地部署網(wǎng)絡(luò)業(yè)務(wù)，提高業(yè)務(wù)收入，增強(qiáng)市場競爭能力。 </p> <p> <br /> 海南光傳輸設(shè)備SDH烽火STM-4電力系統(tǒng)一旦發(fā)生故障, 如果通信不暢, 不能及時(shí)調(diào)度指揮,就會(huì)擴(kuò)大***范圍。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="海南光傳輸設(shè)備SDH烽火STM-4,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244847603603516/458709.jpg"></div><p> 保護(hù)倒換系統(tǒng) </p> <p> 目前環(huán)形網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)用得**多，因?yàn)榄h(huán)形網(wǎng)具有較強(qiáng)的自愈功能。自愈環(huán)的分類可按保護(hù)的業(yè)務(wù)級(jí)別、環(huán)上業(yè)務(wù)的方向、網(wǎng)元節(jié)點(diǎn)間光纖數(shù)來劃分。按環(huán)上業(yè)務(wù)的方向可將自愈環(huán)分為單向環(huán)和雙向環(huán)兩大類；按網(wǎng)元節(jié)點(diǎn)間的光纖數(shù)可將自愈環(huán)劃分為雙纖環(huán)(一對(duì)收／發(fā)光纖)和四纖環(huán)(兩對(duì)收發(fā)光纖)；按保護(hù)的業(yè)務(wù)級(jí)別可將自愈環(huán)劃分為通道保護(hù)環(huán)和復(fù)用段保護(hù)環(huán)兩大類。 </p> <p> <br /> </p> <p> SDH通信網(wǎng)具有保護(hù)機(jī)制實(shí)現(xiàn)網(wǎng)絡(luò)的自愈，在發(fā)生短暫失效時(shí)會(huì)自動(dòng)切換到保護(hù)通道，而不需要人工切換。然而，由于人為因素或設(shè)備故障，一旦發(fā)生業(yè)務(wù)中斷，尤其是傳輸繼電保護(hù)信號(hào)的網(wǎng)絡(luò)發(fā)生故障，造成的巨大損失無法估計(jì)。SDH設(shè)備的保護(hù)方式應(yīng)符合ITU.T建議G．841規(guī)范及將來的G.SHR建議要求。 </p> <p> <br /> </p> <p> 例如某地**環(huán)采用二纖雙向復(fù)用段保護(hù)方式，當(dāng)線路出現(xiàn)故障時(shí)可通過傳輸系統(tǒng)的保護(hù)倒換機(jī)制，使業(yè)務(wù)迅速恢復(fù)(保護(hù)倒換時(shí)間在50rIls以內(nèi))。在二纖雙向復(fù)用段保護(hù)環(huán)上無專門的主、備用光纖，每一條光纖的前半個(gè)時(shí)隙是主用信道，后半個(gè)時(shí)隙是備信道，兩根光纖上業(yè)務(wù)流向相反。 </p> <p> <br /> </p><p style="text-indent:25px">同PDH相比, SDH組網(wǎng)的巨大的優(yōu)越性完全發(fā)揮出來了。用雙環(huán)相切、多環(huán)相切的主干網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu), 采用相切環(huán)時(shí)可在兩環(huán)相切的節(jié)點(diǎn)上采用雙環(huán)網(wǎng)元設(shè)備交叉保護(hù), 克服雙環(huán)相切時(shí)節(jié)點(diǎn)保護(hù)可靠性差的問題。支路可根據(jù)實(shí)際需要采用鏈形、星形、樹形等結(jié)構(gòu)。另外, 采用SDH 設(shè)備的光纖自愈環(huán)可實(shí)現(xiàn)多種形式的通道保護(hù), 而且SDH 光纖環(huán)有較強(qiáng)的自愈能力。傳統(tǒng)的組網(wǎng)概念中,提高傳輸設(shè)備利用率是**關(guān)鍵的,為了增加線路的占空比,在每個(gè)節(jié)點(diǎn)都建立了許多直接通道，致使網(wǎng)絡(luò)結(jié)構(gòu)非常復(fù)雜。而利用SDH 組網(wǎng),使用SDH提供的豐富的開銷字節(jié),就可以極大簡化網(wǎng)絡(luò)結(jié)構(gòu),實(shí)現(xiàn)強(qiáng)大的OAM功能,降低傳輸費(fèi)用并支持新業(yè)務(wù)的發(fā)展, 這正符合了現(xiàn)代通信發(fā)展的目標(biāo)。同PDH相比, SDH組網(wǎng)的巨大的優(yōu)越性完全發(fā)揮出來了。但是由于系統(tǒng)的冗余度高，必會(huì)使系統(tǒng)有效性降低，成本高且結(jié)構(gòu)復(fù)雜。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="海南光傳輸設(shè)備SDH烽火STM-4,烽火" src="https://tyunfile.71360.com/UploadFile/sztykc/637244845101689454/9165528.jpg"></div><p> SDH的復(fù)用包括兩種情況： </p> <p> 1、由STM-1信號(hào)復(fù)用成STM-N信號(hào) </p> <p> 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。 </p> <p> 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。 </p> <p> 2、由PDH支路信號(hào)復(fù)用成STM-N信號(hào) </p> <p> 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)。 </p> <p> 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。 </p> <p> 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。 </p> <p> <br /> 由此可見, 通信在電力系統(tǒng)中的作用是非常關(guān)鍵的。海南光傳輸設(shè)備SDH烽火STM-4</p><p style="text-indent:25px">電力通信要求確保電能的生產(chǎn)、輸送、分配、消費(fèi)在瞬間是同時(shí)完成的。海南光傳輸設(shè)備SDH烽火STM-4</p><p> 基本的網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu) </p> <p> SDH網(wǎng)是由SDH網(wǎng)元設(shè)備通過光纜互連而成的，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)。網(wǎng)絡(luò)的有效性、可靠性和經(jīng)濟(jì)性在很大程度上與其拓?fù)浣Y(jié)構(gòu)有關(guān)。 </p> <p> 網(wǎng)絡(luò)拓?fù)涞幕窘Y(jié)構(gòu)有鏈形、星形、樹形、環(huán)形和網(wǎng)孔形。 </p> <p> 鏈形網(wǎng) </p> <p> 鏈形網(wǎng)絡(luò)拓?fù)涫菍⒕W(wǎng)中的所有節(jié)點(diǎn)一一串聯(lián)，而首尾兩端開放。這種拓?fù)涞奶攸c(diǎn)是較經(jīng)濟(jì)，在SDH網(wǎng)的早期用得較多，主要用于專網(wǎng)如鐵路網(wǎng)中。 </p> <p> 星形網(wǎng) </p> <p> 星形網(wǎng)絡(luò)拓?fù)涫菍⒕W(wǎng)中一網(wǎng)元做為中心節(jié)點(diǎn)設(shè)備與其他各網(wǎng)元節(jié)點(diǎn)相連，其他各網(wǎng)元節(jié)點(diǎn)之間互不相連，網(wǎng)元節(jié)點(diǎn)的業(yè)務(wù)都要經(jīng)過這個(gè)特殊節(jié)點(diǎn)轉(zhuǎn)接。 </p> <p> <br /> </p> <p> <br /> 海南光傳輸設(shè)備SDH烽火STM-4</p><p style="text-indent:25px">深圳市騰云科創(chuàng)信息咨詢有限公司致力于通信產(chǎn)品，以科技創(chuàng)新實(shí)現(xiàn)***管理的追求。公司自創(chuàng)立以來，投身于SDH光傳輸設(shè)備，光端機(jī)，PCM接入設(shè)備，PTN OTN光傳輸設(shè)備，是通信產(chǎn)品的主力軍。騰云科創(chuàng)致力于把技術(shù)上的創(chuàng)新展現(xiàn)成對(duì)用戶產(chǎn)品上的貼心，為用戶帶來良好體驗(yàn)。騰云科創(chuàng)創(chuàng)始人卓龍飛，始終關(guān)注客戶，創(chuàng)新科技，竭誠為客戶提供良好的服務(wù)。</p></p><br /><p>文章來源地址: http://m.cdcfah.com/cp/1145746.html</p></div></div></div></div></div><div id="9qcop8q" class="page-right twoColRt"><div id="ue7rmdp" class="box01 margin10 clearfix"><h3><a href="http://m.cdcfah.com/cp/">猜你喜歡</a></h3><div id="u3ym3tk" class="recomPic likePro"><a href="http://m.cdcfah.com/cp/814588.html"><div><img 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