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http://dantebtxj148.cavandoragh.org/youtube-zai-sheng-shi-jian-gou-ruleul-wihan-14gajiui-hyeonmyeonghan-jichul-bangbeob

This is due to the cables are created using twisted copper pairs of very smaller-gauge wire. Not like usual coaxial cable, this will make interference and degradation a truth whenever handling lengths around 50