In this paper, the crosstalk problem for carbon nanotubes (CNTs) bundle interconnects is dealt with. The CNT bundle is modelled by using the multiconductor transmission line (MTL) theory and, from this, a compact coupled equivalent conductors (CEC) model is derived. The influence of two modelling uncertainties is investigated. In particular, the pattern of the conducting CNTs in the transverse cross section and the size of the terminations. The results obtained for the full MTL model are compared to those obtained by CEC.