A network device architecture comprising a fault-tolerant array of network processing modules, selectively coupled to trunk interface boards through main fabric switch using high-bandwidth communication media and selectively coupled to any of a number of media processing modules using low-bandwidth communication media. The apparatus is applied to an optical drive and generates a non-fixed braking signal according to a focusing error signal. A modulation section modulates a signal by a modulation scheme such that an anti-multipath property is exerted when the signal is demodulated on a receiver side, and transmits the modulated signal at the transmission start timing. The anchor strap is anchored with respect to the vehicle seat such that it is substantially restricted from moving when the vehicle seat is being adjusted vertically. A second resistor coupled between the gate of the first transistor and the low voltage supply terminal. The metal silicide layer can comprise the gate of the IGFET andor an electrode of the capacitor.