A method and system are disclosed for providing an enhanced call waiting message to a customer when the customer is busy on a previous call and receives a current call. A 4-phase clock generator within a clock distribution network provides 4 non-overlapping clock signals dependent upon a received input clock. A slanted trough reflector projects light out one or both ends of the trough outside the footprint of the reflector. The first key information piece which is used in the scrambling of a portion of the input signal recorded during a first recording interval is recorded on the recording medium during a second recording interval being longer than the first recording interval and containing the first recording interval.