A phase-locked loop circuit using a multi-curve voltage-controlled oscillator having a set of operating curves, each operating curve corresponding to a different frequency range over a control voltage range. The assembly may optionally include an electric winch, and a jack. In addition, the communication network problems can be managed before the user’s dissatisfaction notification or disturbance generation. The active link uses a retransmission protocol, which allows recovery of suppressed packets within a given period. The resin layer is raise-molded with a molding tool 16 while being solidified.