Conductor -Each conductor consists of a round wire of annealed high conductivity copper.

Insulation -Each conductor is insulated with solid medium/high density polyethylene insulation.

Twinning - Two insulated conductors are twisted with uniform lay to form a pair. The length of the lay of the pairs is so chosen that the cross-talk is minimum.

Units - 5, 10 or 20 No. of twisted pairs are laid up to form a group which constitutes a unit. Each unit and super unit has an open helical lapping of colored tape for identification.

Stranding - For cable up to 20 pairs the required number of twisted pairs are stranded to form a cable core. For cables having 50 and 100 pairs , 5 numbers of 10 apir or 20 pair units are stranded to form 50 and 100 pair cables respectively.

Core Wrapping and Screening - The filled cable core is wrapped with at least one helical or longitudional plastic tape. Thereafter one aluminium tape ,coated with polythene on both sides is applied longitudinally over the cable core with a specified overlap. The tape is sealed and bonded to the inner surface of the polythene sheath.

Suspension Wire / Strand - A Suspension Wire / Strand is provided.

Sheathing - The screened cable core along with suspension wire as an integral part with the cable is sheathed with black polythene compound to form figure-8 as per specification.