Systems and methods provide integrated wireless and wired data voice and data services via a dual mode telecommunications device. The TMU is calculated based on a linear regression analysis and removing a reference measuring system uncertainty from a net residual error. First and second branched moving pieces are attached to the lower side of a hanging portion of a spring member. The switchable attenuation circuit may be a switched capacitive attenuation ladder of n stages, n being any integer, each ladder stage including a capacitive divider.