When a glass fiber cable emerging from a main channel (1) is guided into a domestic channel line (2), in order to prevent this glass fiber cable from unacceptably having an excessively small radius of curvature in the direction-changing area (6), and thus being damaged, and in order to ensure that the glass fiber cable (3) is in the correct position, this glass fiber cable (3) is guided in a rigid guide tube (7) whose longitudinal axis runs essentially along a cylindrical envelope surface in its central section (7"). The rigid guide tube (7) is fixed in a pipe connecting stub (10) which can be widened elastically and thus, after insertion into the domestic channel line (2), rests on the wall thereof in a stressed manner, and is fixed in its position. That end of the guide tube (7) which projects into the domestic channel line (2) is connected via a sleeve (8) to a flexible pipe, tube (5) or the like. The glass fiber cable is passed from a switching box (4) via the rigid guide tube (7) and the flexible tube (5) to a building which is located on a piece of land and is connected to the domestic channel line (2).