The invention relates to an SLIC circuit (1), which is connected directly
to a telephone line (2), for joint transmission of voice and data via the
telephone line (2), with adequate echo attenuation achieved even at high
data frequencies in that a first current which corresponds to the sum of the transmission
and received currents (Ia, Ib), and a second current (Id) which corresponds to
the current produced by the transmission power level (Vtx) at the data frequency,
are produced, and the difference between the first current and the second current
(Id) is emitted.
