In telecommunication, a filled cable is a cable that has a nonhygroscopic material, usually a gel called icky-pick, inside the jacket or sheath.
The nonhygroscopic material fills the spaces between the interior parts of the cable, preventing moisture from entering minor leaks in the sheath and migrating inside the cable.
A metallic cable, such as a coaxial cable or a metal waveguide, filled with a dielectric material, is not considered as a filled cable.
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