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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_dhjhj/">電話交換機(jī)</a>?龍巖電話交換機(jī)維修南京德世偉業(yè)軟件技術(shù)供應(yīng)</p><div id="rg7f9b4" class="leftbox clearfix"><h1>龍巖電話交換機(jī)維修南京德世偉業(yè)軟件技術(shù)供應(yīng)</h1><div id="2povxuw" class="proBig"><div id="nmyaho3" class="bigimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989706098401482_njdswy_2381943.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="2f8vfrt" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989706098401482_njdswy_2381943.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="pdf33ch" 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>江蘇省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>龍巖電話交換機(jī)維修</p><p><span>***更新：</span>2020-06-19 22:20:08</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="hvs8d4x" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">南京德世偉業(yè)軟件技術(shù)有限公司</a></p><p><span>聯(lián)系人：</span>李永亮</p><p><span>郵箱: </span>634765682@qq.com</p><p><span>電話: </span>13276689930</p><p><span>傳真: </span>025_84728227</p><p><span>網(wǎng)址: </span></p><p><span>手機(jī): </span>025-84728227</p><p><span>地址: </span>經(jīng)濟(jì)開(kāi)發(fā)區(qū)恒盛路5號(hào)4號(hào)樓215-D室</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="rlnfcj8" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="js3cm87" class="box"><p><p style="text-indent:25px">熱敏電阻熱敏電阻可用作加熱元件外，同時(shí)還能起到“開(kāi)關(guān)”的作用，兼有敏感元件、加熱器和開(kāi)關(guān)三種功能，稱之為“熱敏開(kāi)關(guān)”．電流通過(guò)元件后引起溫度升高，即發(fā)熱體的溫度上升，當(dāng)超過(guò)居里點(diǎn)溫度后，電阻增加，從而限制電流增加，于是電流的下降增加元件溫度降低，電阻值的減小又使電路電流增加，元件溫度升高，周而復(fù)始，因此具有使溫度保持在特定范圍的功能，又起到開(kāi)關(guān)作用．利用這種阻溫特性做成加熱源，作為加熱元件應(yīng)用的有暖風(fēng)器、電烙鐵、烘衣柜、空調(diào)等，龍巖電話交換機(jī)維修，還可對(duì)電器起到過(guò)熱保護(hù)作用． NTC熱敏電阻器是一種負(fù)溫度系數(shù)熱敏電阻器，該產(chǎn)品的電阻值隨溫度升高而降低，根據(jù)其作用封裝成各種形狀以及具有不同的技術(shù)指標(biāo)。該產(chǎn)品主要用于溫度補(bǔ)償、溫度測(cè)量和在各類電源中吸收浪涌電流作為線路保護(hù)元件。同樣與壓敏電阻類似，熱敏電阻同樣在集團(tuán)電話交換機(jī)生產(chǎn)設(shè)計(jì)的時(shí)候已經(jīng)***采用。上述兩道防護(hù)措施防護(hù)普通的過(guò)流過(guò)壓保護(hù)已經(jīng)足夠了，但*靠它門(mén)來(lái)對(duì)付高達(dá)上萬(wàn)V的雷電時(shí)它們就力不從心了，瞬間會(huì)被擊穿，龍巖電話交換機(jī)維修，龍巖電話交換機(jī)維修、損壞。壓敏電阻和熱敏電阻共同的特點(diǎn)是：反映速度快能盡量避免高壓通過(guò)的瞬間損害設(shè)備，抗壓系數(shù)低，都是在低電壓的工作狀態(tài)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="龍巖電話交換機(jī)維修" src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989706098401482_njdswy_2381943.png"></div><p style="text-indent:25px">OM20G (＜20人) OM20G是專為小微型企業(yè)或企業(yè)分支機(jī)構(gòu)打造的新一代IP電話交換機(jī)。它支持運(yùn)營(yíng)商IMS接入，融合了電話、傳真、錄音、客戶管理、手機(jī)分機(jī)、錄音轉(zhuǎn)寫(xiě)文字等業(yè)務(wù)，為用戶創(chuàng)造一體化的溝通體驗(yàn)。提高來(lái)話溝通體驗(yàn) 自動(dòng)播報(bào)上下班來(lái)電歡迎詞、智能分配/轉(zhuǎn)接來(lái)電、固話與手機(jī)同振、手機(jī)分機(jī)、一號(hào)雙終端、語(yǔ)音留言……電話不再漏接，客戶溝通更緊密。節(jié)省辦公通信費(fèi)用通過(guò)互聯(lián)網(wǎng)自由接入IP話機(jī)、電腦分機(jī)、手機(jī)分機(jī)，并將國(guó)際國(guó)內(nèi)長(zhǎng)途變?yōu)槭性捇?*電話，大幅降低公司電話費(fèi)用。管理每個(gè)電話 OM20G電話交換機(jī)內(nèi)置儂好商務(wù)助理軟件，可提供來(lái)電彈屏、通迅錄點(diǎn)擊撥號(hào)、**管理、錄音和通話記錄管理、錄音轉(zhuǎn)寫(xiě)文字等功能，助力企業(yè)總機(jī)、員工和客戶三者之間的溝通。智簡(jiǎn)管理，本地+遠(yuǎn)程皆可維護(hù) OM20G電話交換機(jī)提供直觀Web網(wǎng)頁(yè)配置，方便管理員進(jìn)行本地或遠(yuǎn)程管理。分支機(jī)構(gòu)的OM20G，還可由總部統(tǒng)一管理。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="龍巖電話交換機(jī)維修" src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989706097149850_njdswy_3649872.png"></div><p style="text-indent:25px">電話交換機(jī)常見(jiàn)防雷（過(guò)流、過(guò)壓）保護(hù)器件及其應(yīng)用特性壓敏電阻：壓敏電阻是在一定電流電壓范圍內(nèi)電阻值隨電壓而變的電阻，壓敏電阻器的電阻體材料是半導(dǎo)體，所以它是半導(dǎo)體電阻器的一個(gè)品種?，F(xiàn)在大量使用的是"氧化鋅"（ZnO）壓敏電阻器。壓敏電阻有什么用？壓敏電阻的比較大特點(diǎn)是當(dāng)加在它上面的電壓低于它的閥值"UN"時(shí)，流過(guò)它的電流極小，相當(dāng)于一只關(guān)死的閥門(mén)，當(dāng)電壓超過(guò)UN時(shí)，流過(guò)它的電流激增，相當(dāng)于閥門(mén)打開(kāi)。利用這一功能，可以抑制電路中經(jīng)常出現(xiàn)的異常過(guò)電壓，保護(hù)電路免受過(guò)電壓的損害。其特點(diǎn)是：反映速度快、耐高壓系數(shù)底，適用于元件級(jí)別的保護(hù)、靜電保護(hù)、浪涌保護(hù)。現(xiàn)在我們現(xiàn)在電話交換機(jī)設(shè)計(jì)生產(chǎn)的時(shí)候基本都使用了氧化鋅壓敏電阻，這里使用的壓敏電阻的閥值電壓約為270V，當(dāng)電壓小于270V時(shí)（正常值為220V）它相當(dāng)于不導(dǎo)通，而當(dāng)電源異常，短時(shí)超過(guò)270V時(shí)，它就導(dǎo)通，形成短路，將電壓限制在270V。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/319059.html</p></div></div></div></div></div><div id="a87cjl8" class="page-right twoColRt"><div id="ataxpwy" class="box01 margin10 clearfix"><h3><a 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