In according with the present invention, a semiconductor device is formed as follows. The present invention also pertains to a process for flame retarding an organic polymer by applying thereto or incorporating therein a derivative of a pyrimidine, optionally in combination with a further flame retardant. Each optical transmitter is configured to transmit a multi-wavelength light signal. The temperature of the variable optical attenuator is periodically sensed, and a required voltage level is determined to achieve the desired attenuation level based at least partially on the periodically sensed temperature of the VOA. % of at least one sulfate of an alkaline-earth metal selected from calcium, barium, strontium and magnesium. The monitoring system provides an operator interface that allows the operator to direct playback interactively, such as rewinding and forwarding of the playback.