Concentric cables feem ntau yog siv los ntawm cov neeg siv khoom faib khoom sib txuas txuas hluav taws xob thiab cov yees rau ib tus neeg lub tsev lossis kev lag luam.Tsim nyog rau kev faus ncaj qha, lawv kuj tau siv rau sub mains nyob rau hauv siab nce yees thiab txoj kev teeb pom kev zoo.
Rau cov kev sib txuas mus rau lub overhead network, ntsia nruab nrab ntawm lubSecondary overhead faib networkrau txhua tus neeg siv 'meter'.Nws yog tshwj xeeb yog siv los tiv thaiv tub sab nyiag.Ua haujlwm kub: 75 ° C lossis 90 ° C.