通(tong)線(xian)電(dian)(dian)(dian)(dian)纜是(shi)傳輸(shu)電(dian)(dian)(dian)(dian)話、電(dian)(dian)(dian)(dian)報、傳真文件、電(dian)(dian)(dian)(dian)視和(he)(he)廣播(bo)節目、數(shu)據和(he)(he)其他電(dian)(dian)(dian)(dian)信號的(de)電(dian)(dian)(dian)(dian)纜。由(you)一對以上(shang)相互絕(jue)緣的(de)導線(xian)絞合而成。通(tong)信電(dian)(dian)(dian)(dian)纜與架空明線(xian)相比，具有通(tong)信容(rong)量大、傳輸(shu)穩定性高、保密(mi)性好、少受自(zi)然(ran)條(tiao)件和(he)(he)外部干擾影響等優點。

　　通信電(dian)纜(lan)(lan)(lan)：是由多根互相絕緣的(de)(de)導(dao)線(xian)或導(dao)體絞(jiao)成的(de)(de)纜(lan)(lan)(lan)心(xin)和(he)保護纜(lan)(lan)(lan)心(xin)不(bu)受潮與(yu)機(ji)械損害的(de)(de)外(wai)層(ceng)護套所構成的(de)(de)通信線(xian)路。如圖1提供了通信電(dian)纜(lan)(lan)(lan)的(de)(de)照片。在環境特(te)別惡劣的(de)(de)地方，必(bi)要時在通信線(xian)纜(lan)(lan)(lan)護套的(de)(de)外(wai)面(mian)還可以安裝防(fang)護層(ceng)。