28 and 24 AWG stranded TC conductors, non-plenum, Polypropylene insulation, twisted pairs, overall polyester isolation tape + Duofoil® + TC braid shield (92% coverage), drain wire, light gray PVC jacket. Recommended Pulling Tension Max. Recommended Current: C =. This document establishes modelling of limits for mixed-mode transmission parameters within and between two pairs of balanced cabling.