Serat, mode siji utawa macem-macem mode, dipanggonke ing mode tabung longgar saka petg modulus sing dhuwur. Tabung kasebut diisi karo senyawa sing tahan banyu. Liwat tabung, bahan pemblokiran banyu ditrapake kanggo njaga kabel wateright. Lan mbungkus bar plastik sing dikuatake serat (FRP) sing dikuatake. Kabel uni-tabung non-logam kabel anti-rodent rampung karo sarung poliethelin (pe).
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