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class="bigimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989701226092028_njdswy_1867050.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="a2ewyvx" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989701226092028_njdswy_1867050.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="ctqnkro" 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>薊州區(qū)程控交換機(jī)維修</p><p><span>***更新：</span>2020-06-22 23:20:58</p><p><span id="click" >瀏覽次數(shù)：1次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="ktlne83" 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="vdpmtq3" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="827pgyk" class="box"><p><p style="text-indent:25px"> 對(duì)電話程控交換機(jī)遭受雷擊的情況分析：***.電話程控交換機(jī)是由多塊功能電路板拼插組成.電路板上有許多功能集成塊、半導(dǎo)體元件及電感、電容、電阻.其**能集成塊中大量采用CMOS電路.工作電壓在0.7~5V..CMOS電路的過(guò)電壓能力弱.容易損壞.造成電路板甚至整個(gè)程控交換機(jī)系統(tǒng)故障..第二.由于電話交換機(jī)是很多電纜、電線的**點(diǎn)..電話分機(jī)線路多在幾十米至上百米的長(zhǎng)度.涉及區(qū)域廣、范圍大，薊州區(qū)程控交換機(jī)維修.更易受雷擊.. 　　這樣．即使是感應(yīng)雷所形成的感應(yīng)過(guò)電壓對(duì)電話程控交換機(jī)都能形成威脅..雷擊在建筑物(機(jī)房或辦公樓)、設(shè)備(電話程控交換機(jī))及電纜電路的附近發(fā)生；或閃電不直接對(duì)地放電.只是在距建筑物較近的云層和云層之間放電.閃電釋放電荷所形成的強(qiáng)電磁場(chǎng).通過(guò)電話程控交換機(jī)的密集的網(wǎng)線、電源電路和數(shù)據(jù)傳輸電路中感應(yīng)生成過(guò)電壓，薊州區(qū)程控交換機(jī)維修，薊州區(qū)程控交換機(jī)維修。這種“過(guò)電壓”或?qū)㈦娫茨K.或?qū)?shù)據(jù)存儲(chǔ)器及微處理器、電話程控交換機(jī)用戶板擊壞。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="薊州區(qū)程控交換機(jī)維修" src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989701226092028_njdswy_1867050.png"></div><p style="text-indent:25px">經(jīng)常會(huì)有人問(wèn)電話交換機(jī)的作用是什么,簡(jiǎn)單的說(shuō):程控交換機(jī)的作用就是　　1)共用外線 5個(gè)人或10個(gè)人共用一條外線。(起初這樣做的目的是為了節(jié)省電話月租，在90年代，固定電話月租很高，如一個(gè)公司有500員工，不可能沒(méi)人都申請(qǐng)一條直線，那樣的話，月租就是很大的一筆費(fèi)用。公司要讓大家每個(gè)人都有電話用，又想減少成本支出，買(mǎi)電話交換機(jī)就成了一種折中的方案。----每月把錢(qián)交給電信運(yùn)營(yíng)商，我還不如省下月租，買(mǎi)個(gè)程控交換機(jī)，在一年之后，電話交換機(jī)的成本也就回來(lái)了，以后就是賺的了。　　2)管理功能 (現(xiàn)在大家都有電話用了，但是又有個(gè)問(wèn)題：如果不能管理，電話費(fèi)又上來(lái)了。所以又要做一些限制，一些人允許打長(zhǎng)途，一些人允許打市話，有些人只允許打內(nèi)部電話，所以第二點(diǎn)就是管理。　　3)內(nèi)部通話**(如果是本地電話，同事之間溝通，還需要向電信局交錢(qián)。所以在起初正是因?yàn)檫@個(gè)原因，也推動(dòng)了電話交換機(jī)的普及?，F(xiàn)在電信運(yùn)營(yíng)商推出了匯線通，集線通也可以內(nèi)部通話**。　　4)可以相互轉(zhuǎn)接(一個(gè)電話同甲同事講完后可以再轉(zhuǎn)給乙同事。匯線通，集線通也有此功能。　　5)其他功能(代接，代答，內(nèi)部廣播，保留音樂(lè)，電話計(jì)費(fèi)，電腦話務(wù)員，語(yǔ)音信箱，外接廣播。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="薊州區(qū)程控交換機(jī)維修" src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989701226871328_njdswy_4837658.png"></div><p style="text-indent:25px">防雷擊可采取以下措施： 1．程控交換機(jī)應(yīng)有良好的工作接地和保護(hù)接地.接地電阻值應(yīng)小于3Ω..每年都應(yīng)檢測(cè)并有檢測(cè)報(bào)告.. 2．程控交換機(jī)各控制板和外接電纜插口處應(yīng)安裝光電隔離器.. 3．電話電纜的屏蔽接地線應(yīng)和保護(hù)接地極連接良好.. 4．是程控交換機(jī)供電的交流電路(從配電室到交換機(jī))應(yīng)采用屏蔽電纜.屏蔽層應(yīng)和保護(hù)接地極連接良好.. 交換機(jī)遭雷擊損壞大多由雷電天氣在網(wǎng)線上產(chǎn)生的感應(yīng)電壓經(jīng)交換機(jī)信號(hào)端口竄入機(jī)內(nèi)造成，一般的整機(jī)防雷措施如裝設(shè)避雷針、機(jī)殼接地等無(wú)法解決這個(gè)問(wèn)題。一般交換機(jī)信號(hào)端口內(nèi)部都設(shè)計(jì)有防雷擊電路，可以抵抗一般的輕微雷擊，但對(duì)大型雷電產(chǎn)生的雷擊則有些力不從心。為進(jìn)一步解決信號(hào)端口引進(jìn)的雷擊問(wèn)題，可以采取以下一些措施： 1、外線盡量使用鎧裝電纜，并將鎧裝層妥善接地； 2、在外線與交換機(jī)端口之間加接防雷單元，具體措施有： ①串接防雷模塊， ②串接LC吸收單元， ③并接過(guò)壓保護(hù)元件， ④串接其它防雷保護(hù)電路。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/355471.html</p></div></div></div></div></div><div id="bfczwn8" class="page-right twoColRt"><div id="clnf8w7" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="u8wsugn" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強(qiáng) 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