... and sheathed, armored by steel tape, for Local Communication Network, especial for direct buried application Annealed pure copper ... pair, 25 pairs strand together to form a basic unit,12 or 13 pairs to form a ... sub-unit, one or more basic units and sub-units toform a super unit, ... sheah applied.The cable is use in local communication network, especial for direct buried application.Packing: ...