屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)是為了保證在(zai)(zai)有(you)(you)電(dian)(dian)(dian)磁(ci)干擾(rao)(rao)環境(jing)下系(xi)統(tong)(tong)的(de)(de)(de)(de)傳輸性能(neng)(neng)(neng)，這里的(de)(de)(de)(de)抗干擾(rao)(rao)性應包括兩個方(fang)(fang)面(mian)，即抵御外來電(dian)(dian)(dian)磁(ci)干擾(rao)(rao)的(de)(de)(de)(de)能(neng)(neng)(neng)力(li)以及系(xi)統(tong)(tong)本身向(xiang)外輻射(she)電(dian)(dian)(dian)磁(ci)干擾(rao)(rao)的(de)(de)(de)(de)能(neng)(neng)(neng)力(li)。理論上(shang)講，在(zai)(zai)線纜(lan)和(he)連接(jie)件外表包上(shang)一(yi)層金屬材料屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)層，可(ke)(ke)(ke)以有(you)(you)效(xiao)地(di)(di)(di)濾(lv)除不(bu)必(bi)(bi)要(yao)的(de)(de)(de)(de)電(dian)(dian)(dian)磁(ci)波（這也是目前(qian)絕大(da)(da)多數屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)系(xi)統(tong)(tong)采用的(de)(de)(de)(de)方(fang)(fang)法(fa)），然而(er)(er)(er)，這種方(fang)(fang)法(fa)的(de)(de)(de)(de)有(you)(you)效(xiao)程度(du)到底如何(he)呢？對(dui)于屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)系(xi)統(tong)(tong)而(er)(er)(er)言，單單有(you)(you)了一(yi)層金屬屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)層是不(bu)夠的(de)(de)(de)(de)，更重要(yao)的(de)(de)(de)(de)是必(bi)(bi)須將屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)層完(wan)全(quan)良好地(di)(di)(di)接(jie)地(di)(di)(di)，這樣才能(neng)(neng)(neng)把干擾(rao)(rao)電(dian)(dian)(dian)流(liu)有(you)(you)效(xiao)地(di)(di)(di)導入大(da)(da)地(di)(di)(di)。但是，實際(ji)施工時(shi)，屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)系(xi)統(tong)(tong)存在(zai)(zai)一(yi)些不(bu)可(ke)(ke)(ke)忽視的(de)(de)(de)(de)困(kun)難：由于屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)系(xi)統(tong)(tong)對(dui)接(jie)地(di)(di)(di)的(de)(de)(de)(de)苛刻要(yao)求，極容(rong)易造成(cheng)(cheng)接(jie)地(di)(di)(di)不(bu)良，比如接(jie)地(di)(di)(di)電(dian)(dian)(dian)阻過大(da)(da)、接(jie)地(di)(di)(di)電(dian)(dian)(dian)位(wei)不(bu)均衡(heng)等(deng)，這樣在(zai)(zai)傳輸系(xi)統(tong)(tong)的(de)(de)(de)(de)某兩點間(jian)便會(hui)產生(sheng)電(dian)(dian)(dian)位(wei)差(cha)，進而(er)(er)(er)產生(sheng)金屬屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)層上(shang)的(de)(de)(de)(de)電(dian)(dian)(dian)流(liu)，造成(cheng)(cheng)屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)層不(bu)連續，破壞(huai)其(qi)完(wan)整性。這時(shi)，屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)層本身已(yi)經(jing)成(cheng)(cheng)為一(yi)個最大(da)(da)的(de)(de)(de)(de)干擾(rao)(rao)源，因而(er)(er)(er)導致其(qi)性能(neng)(neng)(neng)反而(er)(er)(er)遠不(bu)如非屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)系(xi)統(tong)(tong)。屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)線在(zai)(zai)高頻傳輸時(shi)，需(xu)要(yao)兩端接(jie)地(di)(di)(di)，這樣更有(you)(you)可(ke)(ke)(ke)能(neng)(neng)(neng)在(zai)(zai)屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)層上(shang)產生(sheng)電(dian)(dian)(dian)位(wei)差(cha)。由此可(ke)(ke)(ke)見，屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)系(xi)統(tong)(tong)本身的(de)(de)(de)(de)要(yao)求，恰恰構成(cheng)(cheng)保證其(qi)性能(neng)(neng)(neng)的(de)(de)(de)(de)最大(da)(da)障礙.一(yi)個完(wan)整的(de)(de)(de)(de)屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)系(xi)統(tong)(tong)要(yao)求處處屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)，一(yi)旦有(you)(you)任何(he)一(yi)點的(de)(de)(de)(de)屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)不(bu)能(neng)(neng)(neng)滿足要(yao)求，都勢必(bi)(bi)會(hui)影響到系(xi)統(tong)(tong)的(de)(de)(de)(de)整體傳輸性能(neng)(neng)(neng)。可(ke)(ke)(ke)是，目前(qian)市場上(shang)還很少有(you)(you)網(wang)絡集(ji)線器或計算機本身擁有(you)(you)屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)支持，所以很難實現整個傳輸鏈路的(de)(de)(de)(de)屏(ping)(ping)(ping)(ping)(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)。

遼寧(ning)大(da)元電(dian)(dian)纜制(zhi)造有限公(gong)司(si)位(wei)于鐵(tie)嶺鐵(tie)西工業(ye)園區，成立于1989年6月18日，原(yuan)廠名為“鐵(tie)嶺大(da)元電(dian)(dian)纜有限公(gong)司(si)”。為了適應市場需求，同時(shi)公(gong)司(si)規(gui)模的不斷擴大(da)和發展，于2012年6月更名為“遼寧(ning)大(da)元電(dian)(dian)纜制(zhi)造有限公(gong)司(si)”，占地面積18000平方米，是電(dian)(dian)線電(dian)(dian)纜產(chan)品的專業(ye)生產(chan)制(zhi)造商。