良(liang)好的(de)(de)視頻傳(chuan)輸(shu)設(she)計(ji)是視頻監(jian)控系統(tong)(tong)(tong)中(zhong)(zhong)非常重要的(de)(de)一(yi)(yi)部分。如果一(yi)(yi)套建設(she)好的(de)(de)系統(tong)(tong)(tong)選(xuan)用的(de)(de)都是能(neng)夠產(chan)生或處(chu)理(li)高(gao)質(zhi)量(liang)畫面的(de)(de)攝像(xiang)(xiang)機、鏡頭、監(jian)視器(qi)、錄(lu)像(xiang)(xiang)機，但是沒有良(liang)好的(de)(de)傳(chuan)輸(shu)系統(tong)(tong)(tong)，最終在監(jian)視器(qi)上(shang)看(kan)到(dao)的(de)(de)圖(tu)像(xiang)(xiang)將(jiang)無法令人滿意。根據“木桶法則(ze)”，最終的(de)(de)圖(tu)像(xiang)(xiang)質(zhi)量(liang)將(jiang)取決(jue)于整個系統(tong)(tong)(tong)中(zhong)(zhong)最差的(de)(de)一(yi)(yi)環(huan);而這最差的(de)(de)一(yi)(yi)環(huan)往往就是傳(chuan)輸(shu)系統(tong)(tong)(tong)。系統(tong)(tong)(tong)的(de)(de)設(she)計(ji)人員(yuan)和安裝(zhuang)人員(yuan)必須根據實際(ji)需要選(xuan)擇合適(shi)的(de)(de)傳(chuan)輸(shu)方(fang)式、高(gao)質(zhi)量(liang)的(de)(de)傳(chuan)輸(shu)線纜(lan)和設(she)備、并(bing)按專(zhuan)業標準進行安裝(zhuang)，才能(neng)達到(dao)理(li)想的(de)(de)傳(chuan)輸(shu)效果。

視(shi)(shi)(shi)頻信(xin)號(hao)(hao)傳(chuan)(chuan)輸(shu)(shu)一(yi)般采用(yong)(yong)(yong)直接調制技術、以(yi)(yi)基帶頻率(約8MHz帶寬)的(de)(de)(de)形式，最常用(yong)(yong)(yong)的(de)(de)(de)傳(chuan)(chuan)輸(shu)(shu)介質(zhi)是(shi)同(tong)軸(zhou)電(dian)(dian)纜。同(tong)軸(zhou)電(dian)(dian)纜是(shi)專門設計用(yong)(yong)(yong)來傳(chuan)(chuan)輸(shu)(shu)視(shi)(shi)(shi)頻信(xin)號(hao)(hao)的(de)(de)(de)，其頻率損失、圖像(xiang)(xiang)失真、圖像(xiang)(xiang)衰減的(de)(de)(de)幅(fu)度都比較小(xiao)，能很好的(de)(de)(de)完成(cheng)傳(chuan)(chuan)送視(shi)(shi)(shi)頻信(xin)號(hao)(hao)的(de)(de)(de)任(ren)務。一(yi)般采用(yong)(yong)(yong)專用(yong)(yong)(yong)的(de)(de)(de)SYV75歐姆系列同(tong)軸(zhou)電(dian)(dian)纜，常用(yong)(yong)(yong)型號(hao)(hao)為(wei)SYV75-5(它對視(shi)(shi)(shi)頻信(xin)號(hao)(hao)的(de)(de)(de)無中(zhong)繼傳(chuan)(chuan)輸(shu)(shu)距(ju)離(li)(li)一(yi)般為(wei)300-500m);距(ju)離(li)(li)較遠(yuan)時，需采用(yong)(yong)(yong)SYV75-7、SYV75-9甚(shen)至SYV75-12的(de)(de)(de)同(tong)軸(zhou)電(dian)(dian)纜(在實際工(gong)程中(zhong)，粗纜的(de)(de)(de)無中(zhong)繼傳(chuan)(chuan)輸(shu)(shu)距(ju)離(li)(li)可達1km以(yi)(yi)上);也有(you)通過(guo)增(zeng)加視(shi)(shi)(shi)頻放(fang)大(da)器(qi)以(yi)(yi)增(zeng)強(qiang)視(shi)(shi)(shi)頻的(de)(de)(de)亮(liang)度、色(se)度和同(tong)步信(xin)號(hao)(hao)，但線路中(zhong)干擾信(xin)號(hao)(hao)也會被放(fang)大(da)，所以(yi)(yi)回路中(zhong)不能串接太多視(shi)(shi)(shi)頻放(fang)大(da)器(qi)，否則會出現(xian)飽和現(xian)像(xiang)(xiang)，導致圖像(xiang)(xiang)的(de)(de)(de)失真;距(ju)離(li)(li)更遠(yuan)的(de)(de)(de)采用(yong)(yong)(yong)光(guang)纖(xian)傳(chuan)(chuan)輸(shu)(shu)方(fang)式，光(guang)纖(xian)傳(chuan)(chuan)輸(shu)(shu)具(ju)有(you)衰減小(xiao)、頻帶寬、不受電(dian)(dian)磁(ci)波干擾、重量(liang)輕、保密性好等一(yi)系列優點，主(zhu)要用(yong)(yong)(yong)于國家及省市(shi)級(ji)的(de)(de)(de)主(zhu)干通訊網(wang)(wang)絡(luo)(luo)、有(you)線電(dian)(dian)視(shi)(shi)(shi)網(wang)(wang)絡(luo)(luo)及高速寬帶計算機網(wang)(wang)絡(luo)(luo)。而在閉路電(dian)(dian)視(shi)(shi)(shi)監控系統(tong)中(zhong)，光(guang)纖(xian)傳(chuan)(chuan)輸(shu)(shu)也已成(cheng)為(wei)長距(ju)離(li)(li)視(shi)(shi)(shi)音(yin)頻及控制信(xin)號(hao)(hao)傳(chuan)(chuan)輸(shu)(shu)的(de)(de)(de)首(shou)選方(fang)式。

視(shi)(shi)(shi)頻(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)也可以用(yong)(yong)雙(shuang)(shuang)(shuang)絞(jiao)(jiao)線(xian)(xian)(xian)(xian)(xian)(xian)傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu)，這(zhe)要(yao)用(yong)(yong)到(dao)雙(shuang)(shuang)(shuang)絞(jiao)(jiao)線(xian)(xian)(xian)(xian)(xian)(xian)傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu)設備(bei)。在(zai)某些特殊應用(yong)(yong)場合(he)，雙(shuang)(shuang)(shuang)絞(jiao)(jiao)線(xian)(xian)(xian)(xian)(xian)(xian)傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu)設備(bei)是(shi)必不可少的(de)(de)(de)。如，當(dang)建筑(zhu)物內已經(jing)按綜合(he)布(bu)線(xian)(xian)(xian)(xian)(xian)(xian)標準敷(fu)設了大(da)量(liang)的(de)(de)(de)雙(shuang)(shuang)(shuang)絞(jiao)(jiao)線(xian)(xian)(xian)(xian)(xian)(xian)(標準中稱(cheng)三類線(xian)(xian)(xian)(xian)(xian)(xian)或五(wu)類線(xian)(xian)(xian)(xian)(xian)(xian))并且在(zai)各相關房間內留有(you)相應的(de)(de)(de)信(xin)(xin)(xin)(xin)息接(jie)口(RJ45或RJ11)，則新增閉路電(dian)視(shi)(shi)(shi)監控(kong)設備(bei)時(shi)就不需再布(bu)線(xian)(xian)(xian)(xian)(xian)(xian)，視(shi)(shi)(shi)音頻(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)及控(kong)制信(xin)(xin)(xin)(xin)號(hao)(hao)都可通過雙(shuang)(shuang)(shuang)絞(jiao)(jiao)線(xian)(xian)(xian)(xian)(xian)(xian)來傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu)，其中視(shi)(shi)(shi)頻(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu)就要(yao)用(yong)(yong)到(dao)雙(shuang)(shuang)(shuang)絞(jiao)(jiao)線(xian)(xian)(xian)(xian)(xian)(xian)傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu)設備(bei)。另外對(dui)已經(jing)敷(fu)設了雙(shuang)(shuang)(shuang)絞(jiao)(jiao)線(xian)(xian)(xian)(xian)(xian)(xian)(或兩芯護(hu)套(tao)線(xian)(xian)(xian)(xian)(xian)(xian))而需將前端攝像機的(de)(de)(de)圖像傳(chuan)(chuan)(chuan)(chuan)到(dao)中控(kong)室設備(bei)的(de)(de)(de)應用(yong)(yong)場合(he)，也需用(yong)(yong)到(dao)雙(shuang)(shuang)(shuang)絞(jiao)(jiao)線(xian)(xian)(xian)(xian)(xian)(xian)傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu)設備(bei)。雙(shuang)(shuang)(shuang)絞(jiao)(jiao)線(xian)(xian)(xian)(xian)(xian)(xian)視(shi)(shi)(shi)頻(pin)傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu)設備(bei)的(de)(de)(de)功能就是(shi)在(zai)前端將適合(he)非(fei)平(ping)衡(heng)傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu)(即(ji)(ji)適合(he)75Ω同軸(zhou)電(dian)纜傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu))的(de)(de)(de)視(shi)(shi)(shi)頻(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)轉(zhuan)換為適合(he)平(ping)衡(heng)傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu)(即(ji)(ji)適合(he)雙(shuang)(shuang)(shuang)絞(jiao)(jiao)線(xian)(xian)(xian)(xian)(xian)(xian)傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu))的(de)(de)(de)視(shi)(shi)(shi)頻(pin)信(xin)(xin)(xin)(xin)號(hao)(hao);在(zai)接(jie)收端則進(jin)行與(yu)前端相反的(de)(de)(de)處理，將通過雙(shuang)(shuang)(shuang)絞(jiao)(jiao)線(xian)(xian)(xian)(xian)(xian)(xian)傳(chuan)(chuan)(chuan)(chuan)來的(de)(de)(de)視(shi)(shi)(shi)頻(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)重新轉(zhuan)換為非(fei)平(ping)衡(heng)的(de)(de)(de)視(shi)(shi)(shi)頻(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)。雙(shuang)(shuang)(shuang)絞(jiao)(jiao)線(xian)(xian)(xian)(xian)(xian)(xian)傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu)設備(bei)本身具有(you)視(shi)(shi)(shi)頻(pin)放大(da)作(zuo)用(yong)(yong)，因(yin)而也適合(he)長距離的(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu)。對(dui)以上不同的(de)(de)(de)傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu)方式，所(suo)使用(yong)(yong)的(de)(de)(de)傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu)部(bu)件及傳(chuan)(chuan)(chuan)(chuan)輸(shu)(shu)(shu)(shu)(shu)線(xian)(xian)(xian)(xian)(xian)(xian)路都有(you)較(jiao)大(da)的(de)(de)(de)不同。

通信(xin)(xin)(xin)(xin)線(xian)纜一般(ban)用(yong)(yong)(yong)(yong)在配置有(you)電(dian)動(dong)云臺、電(dian)動(dong)鏡頭(tou)的(de)(de)攝像裝置，在使用(yong)(yong)(yong)(yong)時需在現場(chang)安裝遙控(kong)解(jie)碼(ma)器。現場(chang)解(jie)碼(ma)器與控(kong)制中(zhong)心的(de)(de)視頻矩(ju)陣切換主機之(zhi)間的(de)(de)通信(xin)(xin)(xin)(xin)傳輸線(xian)纜，一般(ban)采用(yong)(yong)(yong)(yong)2芯屏蔽通信(xin)(xin)(xin)(xin)電(dian)纜(RVVP)或3類(lei)雙絞(jiao)線(xian)UTP，每芯截面積為0.3mm2～0.5mm2。選(xuan)擇通信(xin)(xin)(xin)(xin)電(dian)纜的(de)(de)基本原則是(shi)距(ju)離越長(chang)，線(xian)徑越大。例如：RS-485通信(xin)(xin)(xin)(xin)規定的(de)(de)基本通信(xin)(xin)(xin)(xin)距(ju)離是(shi)1200m，但在實(shi)際工(gong)程中(zhong)選(xuan)用(yong)(yong)(yong)(yong)RVV2-1.5的(de)(de)護套線(xian)可以(yi)將通信(xin)(xin)(xin)(xin)長(chang)度擴展到2000m以(yi)上。當(dang)通信(xin)(xin)(xin)(xin)距(ju)離過長(chang)時，需使用(yong)(yong)(yong)(yong)RS-485通信(xin)(xin)(xin)(xin)中(zhong)繼器。

控(kong)制(zhi)(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)通常(chang)指的(de)是用(yong)于(yu)(yu)控(kong)制(zhi)(zhi)(zhi)云(yun)(yun)臺(tai)(tai)及電(dian)(dian)(dian)(dian)(dian)動(dong)可(ke)變鏡頭(tou)(tou)的(de)多(duo)芯(xin)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)，它一端(duan)(duan)(duan)連接于(yu)(yu)控(kong)制(zhi)(zhi)(zhi)器(qi)或(huo)解碼器(qi)的(de)云(yun)(yun)臺(tai)(tai)、電(dian)(dian)(dian)(dian)(dian)動(dong)鏡頭(tou)(tou)控(kong)制(zhi)(zhi)(zhi)接線(xian)(xian)端(duan)(duan)(duan)，另一端(duan)(duan)(duan)則(ze)直接接到云(yun)(yun)臺(tai)(tai)、電(dian)(dian)(dian)(dian)(dian)動(dong)鏡頭(tou)(tou)的(de)相(xiang)應(ying)端(duan)(duan)(duan)子上。由于(yu)(yu)控(kong)制(zhi)(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)提供的(de)是直流或(huo)交流電(dian)(dian)(dian)(dian)(dian)壓，而且一般距(ju)離很短(duan)(有(you)時還(huan)不到1m)，基本上不存在(zai)干擾問題，因此(ci)不需(xu)要(yao)(yao)使(shi)用(yong)屏(ping)蔽線(xian)(xian)。常(chang)用(yong)的(de)控(kong)制(zhi)(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)大多(duo)采用(yong)6芯(xin)或(huo)10芯(xin)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)，如RVV6-0.2、RVV10-0.12等。其(qi)中6芯(xin)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)分別(bie)接于(yu)(yu)云(yun)(yun)臺(tai)(tai)的(de)上、下、左、右、自動(dong)、公(gong)共(gong)6個(ge)接線(xian)(xian)端(duan)(duan)(duan)，10芯(xin)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)除了(le)接云(yun)(yun)臺(tai)(tai)的(de)6個(ge)接線(xian)(xian)端(duan)(duan)(duan)外還(huan)包(bao)括電(dian)(dian)(dian)(dian)(dian)動(dong)鏡頭(tou)(tou)的(de)變倍、聚(ju)焦、光圈、公(gong)共(gong)4個(ge)端(duan)(duan)(duan)子。在(zai)閉路電(dian)(dian)(dian)(dian)(dian)視監控(kong)系統中，從解碼器(qi)到云(yun)(yun)臺(tai)(tai)及鏡頭(tou)(tou)之間的(de)控(kong)制(zhi)(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)由于(yu)(yu)距(ju)離比較(jiao)短(duan)一般不作特別(bie)要(yao)(yao)求(qiu);而由中控(kong)室的(de)控(kong)制(zhi)(zhi)(zhi)器(qi)到云(yun)(yun)臺(tai)(tai)及電(dian)(dian)(dian)(dian)(dian)動(dong)鏡頭(tou)(tou)的(de)距(ju)離少則(ze)幾(ji)十米，多(duo)則(ze)幾(ji)百米，對控(kong)制(zhi)(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)就需(xu)要(yao)(yao)有(you)一定的(de)要(yao)(yao)求(qiu)，即線(xian)(xian)徑要(yao)(yao)粗，如選用(yong)RVV10-0.5、RVV10-0.75等。

聲音監聽線纜一般采用4芯屏蔽通信電纜(RVVP)或3類雙絞線UTP，每芯截面積為0.5mm2。在沒有干擾的環境下，也可選為非屏蔽雙絞線，如在綜合布線中常用的5類雙絞線(4對8芯);由于監控系統中監聽頭的音頻信號傳到中控室是采用的點對點布線方式，用高壓小電流傳輸，因此采用非屏蔽的2芯電纜即可，如RVV2-0.5等。

文章編輯：CobiNet(寧波)，本公司專注于電訊配件,銅纜綜合布線系列領域產品研發生產七類,六類,超五類屏蔽網線雙絞屏蔽線及相關模(mo)塊配件,歡迎來電(dian)咨詢0574 88168918；

我們是萬兆網絡模塊，萬兆屏蔽模塊，10G網絡模塊，10G屏蔽模塊，keystone jack生產廠家。