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WLAN以太網供電系統如何防雷?

萬邦智慧     2020-12-30     1296

近年來(lai),VoIP 、WLAN、網絡(luo)(luo)視頻監控等(deng)(deng)業(ye)務飛速發展,IP電(dian)話、無線AP、網絡(luo)(luo)攝像機(ji)等(deng)(deng)設(she)備(bei)數量終(zhong)端、電(dian)源數據(ju)線布線復雜,取電(dian)困難,成(cheng)本(ben)高,以太(tai)網供(gong)電(dian)技術允許供(gong)電(dian)設(she)備(bei)通過以太(tai)網在傳輸數據(ju)信號的(de)同(tong)時向網絡(luo)(luo)受(shou)(shou)電(dian)設(she)備(bei)提(ti)供(gong)一定功率的(de)直(zhi)流電(dian),能在確保(bao)現有(you)結構化布線安全的(de)同(tong)時保(bao)證(zheng)現有(you)網絡(luo)(luo)的(de)正常運作(zuo),最大限度(du)地降低成(cheng)本(ben),該技術受(shou)(shou)到國內外眾多電(dian)信運營(ying)商青睞。

一、以太網供電技術概述


IEEE從1999年(nian)開始對POE進行標(biao)準化工作(zuo),目前通用標(biao)準為(wei)(wei)IEEE 802.3af,POE主要由兩(liang)部(bu)分組(zu)成:提(ti)供(gong)電(dian)(dian)(dian)(dian)源(yuan)的設(she)(she)備(bei)(bei),稱為(wei)(wei)供(gong)電(dian)(dian)(dian)(dian)設(she)(she)備(bei)(bei)(PSE),接受和(he)使(shi)用電(dian)(dian)(dian)(dian)源(yuan)的設(she)(she)備(bei)(bei),稱為(wei)(wei)受電(dian)(dian)(dian)(dian)設(she)(she)備(bei)(bei)(PD),POE (Power Over Ethernet),指的是(shi)在現(xian)有的以太(tai)網(wang)Cat.5/Cat.6布(bu)線基(ji)礎架(jia)構(gou)不作(zuo)任何(he)改動的情(qing)況(kuang)下(xia),在為(wei)(wei)一些基(ji)于IP的終(zhong)端(如IP電(dian)(dian)(dian)(dian)話(hua)機(ji)、無線局域(yu)網(wang)接入點AP、網(wang)絡(luo)攝像機(ji)、便攜設(she)(she)備(bei)(bei)充電(dian)(dian)(dian)(dian)器、刷卡機(ji)等)傳輸數據(ju)信號的同(tong)時,還能為(wei)(wei)此類設(she)(she)備(bei)(bei)提(ti)供(gong)交直流供(gong)電(dian)(dian)(dian)(dian)的技術。

二、雷電對WLAN系統的危害

POE技術發展至今(jin)已(yi)經(jing)有(you)十余(yu)年,在中國通信領域WLAN等系(xi)統得到了廣泛的應用,最大可靠傳輸距離(li)可達100米,以太網兩(liang)端連(lian)接均為造價昂貴,但(dan)防護(hu)能力極其脆弱的通訊設備(bei),尤其是處于室外的WLAN系(xi)統,一旦(dan)遭受雷(lei)擊,輕則(ze)導致設備(bei)損壞、信號中斷(duan)、數據永久(jiu)丟失,重則(ze)人身傷亡。歷年來,防雷(lei)成為運營商的基礎(chu)設施建設的難點。

WLAN系(xi)統(tong)主要(yao)是由天線、無線AP、交(jiao)換機(ji)、服務(wu)器等(deng)設備組成,危(wei)害主要(yao)是來源于直擊雷(lei)與雷(lei)電(dian)(dian)電(dian)(dian)磁脈沖,直擊雷(lei)主要(yao)是直接擊中WLAN系(xi)統(tong)設備而造成的損(sun)壞(huai),雷(lei)電(dian)(dian)電(dian)(dian)磁脈沖主要(yao)是通過饋(kui)線、網線、電(dian)(dian)源等(deng)線路對(dui)設備造成損(sun)壞(huai)。

三、POE防雷的難點問題

WLAN系統中(zhong),室(shi)外型無線(xian)AP處于樓頂或(huo)者鐵(tie)塔等位(wei)置,因為取電(dian)、布(bu)線(xian)都比較困(kun)難(nan),大部分情況(kuang)會采用(yong)POE供(gong)電(dian),POE交(jiao)換(huan)機離AP往往會有幾十米,這段距離的網線(xian)在雷擊情況(kuang)下(xia)容易(yi)形成雷電(dian)電(dian)磁(ci)脈沖(chong),雷電(dian)電(dian)磁(ci)脈沖(chong)沿(yan)著網線(xian)入侵到無線(xian)AP或(huo)POE交(jiao)換(huan)機,造成設備損壞。

根據POE本身(shen)的特點, POE最(zui)大(da)可靠傳(chuan)輸距離為100米,當中間加裝防雷器或其(qi)他設備后(hou),容易產(chan)生信(xin)號衰減、功(gong)率損耗等(deng)問題,功(gong)率、通信(xin)效果、傳(chuan)輸距離得不到保障,這對防雷器性能提出了極高的要求。

四、WLAN整體防雷解決方案

對(dui)于(yu)WLAN系統防雷,除直擊雷防護外,雷電電磁脈(mo)沖(chong)成為防雷工作(zuo)的重點。

直(zhi)擊雷防(fang)護,直(zhi)擊雷防(fang)護體(ti)系由接(jie)閃器、引下線,接(jie)地(di)裝置組(zu)成。首(shou)先要對出于(yu)室外(wai)天線安裝避雷針,由引下線連接(jie)地(di)網,確保為雷電流提供泄(xie)放通道(dao)。直(zhi)擊雷的特(te)點是(shi)容易(yi)對某(mou)一(yi)點造成損壞(huai)。

雷(lei)(lei)(lei)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)磁(ci)脈(mo)沖(chong)防護(hu),雷(lei)(lei)(lei)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)磁(ci)脈(mo)沖(chong)是由(you)雷(lei)(lei)(lei)擊產生的電(dian)(dian)(dian)(dian)(dian)磁(ci)場(chang),引起WLAN系(xi)(xi)(xi)統饋線(xian)(xian)、網線(xian)(xian)、電(dian)(dian)(dian)(dian)(dian)源等(deng)線(xian)(xian)路產生過電(dian)(dian)(dian)(dian)(dian)壓入侵設備(bei)造(zao)成(cheng)(cheng)損(sun)壞(huai)。雷(lei)(lei)(lei)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)磁(ci)脈(mo)沖(chong)的特點是容易對數公里范圍造(zao)成(cheng)(cheng)損(sun)壞(huai),因而成(cheng)(cheng)為防雷(lei)(lei)(lei)的重點。WLAN系(xi)(xi)(xi)統需要在(zai)AP饋線(xian)(xian)端口與(yu)(yu)網口分(fen)別(bie)安(an)裝R25N70F饋線(xian)(xian)避雷(lei)(lei)(lei)器、POE系(xi)(xi)(xi)列以太網供電(dian)(dian)(dian)(dian)(dian)防雷(lei)(lei)(lei)器,在(zai)POE交(jiao)換(huan)機電(dian)(dian)(dian)(dian)(dian)源、網口分(fen)別(bie)安(an)裝M40B1+N單(dan)相電(dian)(dian)(dian)(dian)(dian)源防雷(lei)(lei)(lei)器與(yu)(yu)POE系(xi)(xi)(xi)列以太網供電(dian)(dian)(dian)(dian)(dian)防雷(lei)(lei)(lei)器。 

五、POE防雷方案介紹

針對POE供電(dian)(dian)(dian)與雷(lei)電(dian)(dian)(dian)防(fang)護(hu)這兩大難(nan)題,國內領先(xian)的防(fang)雷(lei)解(jie)決方案供應商——天(tian)盾公(gong)司率(lv)先(xian)推出(chu)集成(cheng)供電(dian)(dian)(dian)、通訊、防(fang)雷(lei)整體解(jie)決方案:

第一、交(jiao)換機具備POE功(gong)能(neng)時(shi),對無(wu)線AP進行(xing)以太網供(gong)(gong)電(dian):普通型POE防(fang)雷器可達到(dao)防(fang)雷功(gong)能(neng),即信號線保持(chi)正常通訊并同(tong)時(shi)給(gei)AP進行(xing)供(gong)(gong)電(dian)時(shi),內部防(fang)雷模組能(neng)有(you)效泄放(fang)線上雷電(dian)成分(fen)。分(fen)別(bie)在(zai)交(jiao)換機側(ce)與AP側(ce)安裝POE防(fang)雷器,從(cong)而(er)確(que)保兩側(ce)設(she)備端口安全,免受(shou)雷擊損壞。

第二、交(jiao)換(huan)機(ji)為普通(tong)交(jiao)換(huan)機(ji)時,對(dui)無線AP進行以太(tai)網供電:POE合(he)路(lu)器輸入側有兩(liang)個(ge)端(duan)口(kou)(kou),一個(ge)端(duan)口(kou)(kou)外接AC/DC電源獲(huo)取電源,另(ling)一個(ge)端(duan)口(kou)(kou)連接交(jiao)換(huan)機(ji)獲(huo)取信號,輸出端(duan)口(kou)(kou)連接無線AP,通(tong)過POE合(he)路(lu)器整合(he)對(dui)無線AP同時實現供電、通(tong)信、防雷等功能。

第三、交換機(ji)具備POE功(gong)能時,對無線AP進行(xing)單獨電(dian)(dian)源(yuan)線路供電(dian)(dian):POE分(fen)路器(qi)輸入側(ce)連接(jie)POE交換機(ji)獲取電(dian)(dian)源(yuan)與信(xin)號,輸出側(ce)分(fen)為兩個端口(kou),一個端口(kou)連接(jie)AP電(dian)(dian)源(yuan)線路,對AP進行(xing)供電(dian)(dian),另外(wai)一個端口(kou)連接(jie)AP通信(xin)端口(kou),對AP進行(xing)通信(xin)。

隨著WLAN系統(tong)在國內的廣(guang)泛應用,POE技術隨之得(de)到發展與(yu)提(ti)升,如(ru)何保障WLAN系統(tong)在雷電(dian)等環境上正常(chang)運行,我們除需要提(ti)高對(dui)防(fang)雷的認識,同時需要積極研(yan)究現代防(fang)雷技術,最大程度上避(bi)免雷電(dian)災(zai)害。


來源:互聯網
采摘:godvsgay.com

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