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重庆安防布线中光端机常见问题及解决方?/h1>

  安防监控(dai)工程中越来越多的(yue)用光纤技(lian)传(cha)图像、声音、数据等信息,光(zui)(zui)(wan)传(cha)系统的关键(cong)备――数字视频光(zui)(zui)端机受到(lang)(qian)大用户(jiong)的青睐。(bei)面总结了光(zui)(zui)端常见故障及解决方案(bi)?/span>

  1、光(zui)(ku)机的光(zui)路故障(jie)(xi)

(mo)(mo)(mo)(mo)安(xiong)监控(dai)工程(juan)(juan),(wei)缆(chan)多数都()用(xi)自行(shen)(shen)(cong),(juan)(juan)般为G652单模(wei)纤(mo)(mo)由于系统覆盖范(qie)(qie)一(cun)般都(juan)(juan)大(ben)用标配(≤20KM)(cong)备(wei)(xiong)路损(yao)都很富(mao),(qie)(qie)此(ben)光(zui)(ku)机对(gui)(zui)路损(yao)(he)有过(zha)的要求(die)(ben)但(tuan)用(xi)常会遇(ta)到无(qie)(qie)像(mo)(mo)(huo)像(xi)动、(huo)像(xi)(chuan)(yue)差等故(sheng)障,这(li)(chan)数故障都出在光(zui)路两(ku)的(hao)纤(mo)(mo)(ci)线或适配器上(ben)而(shen)(shen)(hao)与(juan)(juan)干(wei)路有(mo)(mo)?/span>

  常(ge)的(juan)障(cang)?/span>

  1、(huo)纤活动连接器插(qi)(juan)(cao)?

  2、光(zui)纤活(e)连接器纤芯((yao)瓷?被污染?/span>

(mo)(mo)解决办法(tuan):

(mo)(mo)1)(mo)重(dun)(kou)插入活动连(chuo)()器或调(ze)换光纤跳?

  2)、用99.9%无(chuo)(an)(cen)醇(jie)擦拭插头,(shen)(qian)纤?

(mo)(mo)3)(mo)用万用表检查摄像机视频缆,判断有无(xi)视频信号(fu)(mo)?/span>

(mo)(mo)2(mo)光端机(man)的数据接口:

(mo)(mo)(juan)适(xiao)(yue)防监(jia)(dai)的(dan)要(guang)(ren)系(hun)(yang)种设备(矩阵(ben)(ben)(chu)(qian),(ren)解码?都提()供R(hu)S-485(kou)式的数(rong)接(sha)(hong),(ren)此格式的(qing)数据接口的优(liao)是(mei)输距离长,(ren)负载(jian)(jian)(jie)(qian)强,(ren)并能(shi)(zi)成四(shui)(hao)全双(bi)工通(qing)(jun)总(hun)(hao)(ben)(ben)(chu)(hao)(juan)任何两(hong)设(chan)都(shi)(jian)(jian)(jie)(lin)现双(bi)(yang)通(qing)(jun)(ben)(ben)而(han)(han)线RS-422总(hun)(hao)则只(jian)(jian)(jie)(lin)现主(mo)从机(hong)间的(qing)(hong)(han)(han)通(qing)(jun)(ben)(ben)从机(hong)间则(da)(juan)能(shi)(mo)(xiao)的缺(liao)是有一(juan)使(jian)(jian)端(ben)(ben)(han)(han)(su)(juan)态形(jian)式,(ren)(zi)通(qing)(jun)带来(juan)稳(yue)甚?ldquo;卡死”现象(bo)(mo)(xiao)果出现不(jian)(jian)(jie)(qing)(jun)((chan)控(dai))(ben)(ben)(han)(han)从以(hu)(juan)几(kou)面查找(lei)原(zeng)(ben)(ben)?/span>

(mo)(mo)(mo)(mo)(mo)(mo)1).检测有无控制信(hong)用(ke)万(yun)(ke)表交?0V(jin)测控制?矩阵(mo)(mo)(mo)硬录等)输出(pi)(pi)RS-485(hong),看其有无控制信号输出(pi)(pi)(mo)(mo)(mo)?/span>

  2).(rou)断光(ling)机RS-485接口(yi)是否正常(fu)(ben)()(gui)UA-B电压(nie)为(hong)(rou)视为(hong)正常(fu)。云台乱转不能控(ben)()种现(bang)象是(yi)两个(fu)原因造成(yao)(ben)a(lian))RS-485(ku)口(yi)A+,B-接反;b)系统(bai)(qu)抗严重不(ao)配?/span>

(mo)(mo)3(mo)光(zui)端机的开(fou)关量

  (liao)(wei)量()(())信号是T(xie)TL电平(fei)脉冲串(ben)(han)能控(rou)警灯、警铃(kou)继(hu)电器等工作,(liao)(wei)量()(())接口(fei)负载能力(shui)(hu)所控制(fei)(tong)流大小来衡量()(())(ben)(han)EW(fei)列(wei)端(lian)(hong)(liao)(wei)量()(())(lu)载能力?le;1.5A?/span>

(mo)(mo)(mo)(mo)1.EW系列(wei)端机开(wei)量接口支持(ning)开按钮,(wu)如(juan)图接法时,(ren)(rou)常开(mo)(mo)常(xiang)形式均支持?/span>

  2.开关量()()口不能直(cun)(qian)联(huan)用(ke),如有需(ying)(xia)只能通过分配电路()入(ai)?/span>

(mo)(mo)3.有些(yue)户用RS-485总线传输(wei)开关(chou)()(ben)根据我们的(yue)践(zi)验(xuan)(gui)(ben)这(san)种方(nan)式(ren)(hong)取(ben)常会(ya)(pi)现工作(chu)段(dian)??~4?即(chong)机(hong)(bang)象。开关(chou)()转RS-485的转换器制(duo)有(ling)(ji)陷可能是故障所在?/span>

(mo)(mo)(mo)(mo)4(mo)(mo)(huo)(zui)端机的瞬态(huo)扰的(qing)危(bian)及应对措施:(xi)

  1).瞬态干(jia)(jia)的产生:瞬态干(jia)(jia)产生于大型(yi)性负(qi)(jin)如电(shu)机、变压器、(quan)电器等设备的开(wei)转(jiang)(rong),(xi)及(ban)电(shu)(fei)发生过程(yu)(fu),(han)往往(xi)静电感应的方式(fang)(wei)侵(wei)端机?/span>

  2).瞬态干(gong)扰(ban)危害:(yang)于(yi)()干扰频(shi)高、持续时间短、干(gong)扰幅度大(成(yao)上千?、它()(hong)以(hu)烧坏光端机的RS-485接口芯片、(heng)(fu)芯片等关键部位,却不(zhen)留痕(ma),尤其是夏(ying)雷(jing)雨季节,(ma)种破坏力影响很大,使用(ke)户、商(yue)(duo)厂家都十分伤脑(shi)?/span>

(mo)(mo)(mo)(mo)3).应对措施(dan):尽(geng)光(zui)端机(man)(man)制(duo)(chai)采用(bang)各种保(liao)护手(luan),如旁()(wen)法(自恢(jia)复二(lao)极(quan))(mo)(mo)吸收法((hong)向抑(cai)(bang)(shen)(geng)等(li))(mo)(mo)隔(cu)离法(光耦隔(cu)?,但(cheng)是仍(juan)能(yue)全消除(guang)瞬态数(kai)字光(zui)端机(man)(man)(dui)场(man)(man)施工常见故障(hong)解(cong)以(hu)数字光端机为例(pin),以(hu)(juan)()(cong)以(hu)(qie)路视(qian)(juan)(wen)反向数(kai)据光(zui)端机(man)(man)(juan)例,其()他机(man)(man)(kui)(pin)理同(mo)(mo)?/span>

(mo)(mo)1. (zu)(kang)频图(du),也无(xi)法对云台(zhuo)()制(bu)(mo)?/span>

  可能(suo)障原(zeng)()(ben)?/span>

(mo)(mo)·(nao)频没有(cha)入,数据线没有接通?/span>

  测试(cu)方法(ben)(ben)(ben)当(nao)(qian)信号接入(ai)(hong)射光端机时(ben)(ben)(ben)相对应的视频通道指示灯会(bang),如不(zhen)(bang),(xuan)明(nao)(qian)没有(shi)正常输入(ai)(ben)(ben)(ben)检查数据线的接法是(yi)(yang)正确,如(yong)(yi)485(suo)据(ben)(ben)(ben)请?(hong)接(wan)(wan)柱(485A)?(hong)接(wan)(wan)柱(485B);如(yong)(yi)TTL(suo)据(配和(chan)地(ban)伟业618系列(nao)码?(ben)(ben)(ben)请?(hong)接(wan)(wan)柱(MS)?(hong)接(wan)(wan)柱(GND)?/span>

  ·光纤(wan)路不通或衰(ban)太大?/span>

(mo)(mo)(xian)(xian)试方法(chen)(ben)(ben)(ben)用光功率计(hong)以直接(sha)(sha)(xian)(xian)出光(ling)(ling)(ling)线路(kun)断(hong)衰减(qi)()况。实(xian)(xian)光(zui)(zui)(e)(xi)()如在()-4dB—-21dB以内(juan)(hong)(ning)(gao)在()(juan)(zhan)()光(zui)(zui)(e)(xi)()计的情况(juan)()(ren)(hong)以(kun)过(beng)观察(liao)光(ling)(ling)(ling)(lian)(hong)(gan)(hong)的(tong)态识别线(wen)通断(ben)(ben)(ben)(han)()(hong)射光(ling)(ling)(ling)(lian)不(e)任(huan)视(chui)信(hong)时(lu)(ben)(ben)(ben)(han)果接(sha)(sha)(lu)光(zui)(zui)端机所(lian)(ling)(ling)(ling)(zhong)态指(gan)(hong)均亮(han)(ben)(ben)(ben)(han)说明(mei)光(ling)(ling)(ling)线路(juan)通或衰减太大(ben)(ben)(ben)正(ning)情()况(dian)如果(hong)射(lian)(hong)(juan)(wen)接(sha)(sha)入视(chui)?指(yun)(zun)(zun)亮(han))(ben)(ben)(ben)(han)(zui)(zui)纤线(wen)正(ning)连(kun)时(lu)(ben)(ben)(ben)接(sha)(sha)(lu)机第一(cun)(wen)的视频指(yun)(zun)(zun)也(yang)时(lu)(bang),(ren)其余(kun)(zun)(zun)不(bang),(ren)(yang)时(lu)也说明(yi)(zui)(zui)端机自身工(hu)正常(mo)?/span>

(mo)(mo)(mo)(mo)·两端光端机没有(ning)供(zong)电?/span>

(mo)(mo)(mo)(mo)(xian)(nai)方法(chen):检(xian)供电情()(cong)?/span>

(mo)(mo)·发射(lian)(hong)接收(lian)颠?/span>

(mo)(mo)测试(kou)法(ben)(ben)(ya)射机(man)为T(gong)S(ben)(ben)视频(cai)为VID IN(ben)(ben)接收机(man)为RS(ben)(ben)视频(cai)为VID OUT(mo)?/span>

(mo)(mo)2. 有视频(cai)(du),但无法对云(cai)控制(mo)?/span>

  可能(shi)故障原因?/span>

  ·光纤线路衰(ban)到达临界(zhuo)值?/span>

  测试方法用(ke)光(sui)(sui)(dui)(cong)(cong)检测()如(yong)衰(ban)()?0dB以上(),或光(sui)(sui)(dui)(cong)(cong)测量()(lian)为-20dB左右?/span>

  ·解码器的(qing)(ma)码地址(xiu)是否(xia)主(fu)控设备所(kun)择(han)(han)的(fan)址(kun)择(han)(han)一致?/span>

  测试方法:参(dui)说明书,对(dui)解(lian)(huo)拨码与主机选择通(zheng)是否一致?/span>

  ·主控(cong)备(fei)协(cong)是否选(qun)和()码器(sa)一致?/span>

  测试方(gui):参(yi)照说明书,(shen)(mo)协议是否一致?/span>

(mo)(mo)(mo)(mo)·光端机数据接口类型是否和解码(zhao)的选(sui)匹配(mo)(mo)?/span>

(mo)(mo)测试方法:天地伟业TC-615(fei)列()解码(cong)?包(qi)(nou)云?和其(xi)(yi)?85通(yun)方(gui)的解码(huo)配合(hao)485接口的光端机;(chan)地(mei)业(gu)TC-618(fei)列()解码(cong)?包(qi)解码(cong)?配合(hao)TTL接口的光端机,请(gui)查接口类(bei)型?/span>

  ·(gui)查数据线是否()反?/span>

(mo)(mo)测试(kou)法(chen)?85的A(xia)B(xi)及TD总线的MS(xia)GND是否(xi)()反(she),(han)照说明书的(juan)据口定(qing)

(mo)(mo)·(ji)端(suo)据(kan)线(kua)(wen)离超过150米?/span>

  测试方(gui)(chen):检(mo)前端监()点(wei)(ling)机距(fu)解码(huo)的距(fu)是(yang)超(he)?50米,如数(kai)据线过(hui)(ni),很可能会造(chuo)带载(jiao)(jian)(jie)不够?/span>

  ·一对光(zui)端机接解(lian)器(sa)过多?/span>

(mo)(mo)(mo)(mo)测试(cu)(kou)法:一(cun)对光(zui)端机(man)所带解(lian)器的(juan)量不应超过光(zui)端机(man)的视频路数?/span>

(mo)(mo)3. 视(qian)(qie)(ju)(meng)出现滚屏(mo)(xing)色(cha)纹干(gong)扰、花屏(dai)现象(mo)?/span>

(mo)(mo)可能故障原因?/span>

(mo)(mo)·光纤线路衰减()太大,可用功率计测量?/span>

  (xian)试方法(chen):(yang)光(sui)(tong)率计检(xian)()<-18dB(juan)(hong)常?/span>

  ·光端(lian)受到(ban)(ji)信号(fu)源的干扰,如(liao)电(she)(heng)(quan)(she)等?/span>

  测试方法(ben)(yang)认现场周围是(yang)有(shi)这样(gu)(fei)(fan)扰源(ben)挪(e)地点调试?/span>

  ·光端机电源故(sheng)障(pan)?/span>

(mo)(mo)测试方法(chen):更换电(shu)源(song)(xuan)(luo)(ren)(qian)(duo)(mao)稳(zha)电(shu)源,(ren)在主控室内,(ren)有(qun)件的情况下,(ren)(xuan)加(mao)UPS电(dian)(mo)?/span>

  4. (suo)据(kan)控制(zu)有(shi)(zu)无(xi),或云台(zhuo)自动(zu)转(485(suo)据(kan)接口)

  可能故(xu)原因?/span>

  ·485阻抗匹配不好,带载过(beng)(beng)多或()制线距离过(beng)(beng)?超过(beng)(beng)150?或没有(qun)(ning)照总线制布(kan)线?/span>

  测试方法:由?85协议对阻(ge)匹(yan)的要求很高,所(xi)在()很多工程(dui)场,由于(zhi)工布线的不同(qian),阻(ge)匹(yan)(zhan)不完(yu)全相同,请尽量采用总线方式连接解码器,如(suo)(ling)(ke)星型接法,建议加装TC-3001?85隔离器?/span>

(mo)(mo)5. 某一(wen)或几路(fan)视频图像没有,但(hong)对(bang)台控制(bu)(mo)?/span>

(mo)(mo)可能故障原因?/span>

  ·输入视频(qi)号(fu)不正常(gao)?/span>

(mo)(mo)测试方法(chen):检查发射光端机相对应的视(qian)入(ai)通(zheng)(juan)示灯是否亮,(han)(han)果视频信号(feng)入正常,(ren)则对应指(bao)示灯会亮,(han)(han)(juan)示灯不(bang),(ren)则说明前端信号源存(hua)故障(mo)?/span>

  6. 光端机(hong)(chan)个(fu)解码器(lu),某些能(shi)(e),(mo)些不能(shi)(e)?/span>

(mo)(mo)可能故障原因?/span>

  ·不能动解码器控制线接错()?/span>

  测试方法(ben)(dong)(mo)控(dai)制线?/span>

(mo)(mo)·不能动解(lian)(huo)(ma)码设置错(luan)(mo)?/span>

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