Training, refreshing andor updating Ethernet link partners for silent channels andor silent directions of channels may be determined based on control parameters. A bolt is arranged in the expanding sleeve so as to be longitudinally movable by the clamping device for expanding the expanding sleeve using a conical portion of the bolt. For example, techniques are provided herein for constraining respective decoding candidates to possible radio network temporary identifier values, performing validity checking on payload of respective decoding candidates, and selecting a most likely decoding candidate from a previously pruned set of candidates.