In telecommunications, a filled cable is a cable that has a non-hygroscopic 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.
This article incorporates public domain material from Federal Standard 1037C.
See Telcordia GR-421-CORE, Generic Requirements for Metallic Telecommunications Cables, for filled, polyolefin-insulated conductor (PIC) cable requirements.
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