Method and apparatus for providing a wireless mesh network and network node are described. The cartridge is connected to the at least one accommodating element so as to be movable relative thereto while being provided with at least one mounting element for a coupling element to which at least one of the optical waveguides and at least one other optical waveguide can be connected. The tobacco tray is in the form of a drawer which provides for insertion and removal of the tobacco tray from the holder thereby facilitating quick replacement of the tobacco. The PGS may consist of parallel stripes in various patterns, or may be spiral-shaped, lattice-shaped, or the like.