A single-pass imaging system for a printing apparatus capable of 1200 dpi or greater that includes a homogenous light generator for generating homogenous light from high energy IR lasers, a spatial light modulator including light modulating elements arranged in a two-dimensional array, and an anamorphic optical system. The start pulse HST has a pulse width that includes a plurality of pulse widths of the clock pulses HCK and HCKX, for example, two pulse widths. When the liquid crystal layer is of negative type liquid crystal, the initial orientation direction of liquid crystal in the liquid crystal layer is parallel to the direction in which the l-display line extends, or angularly displaced within \xb12 degrees clockwise with respect to the direction in which the l-display line extends. Each of the second keybars has a generally rounded engagement surface and the second stator core includes recesses with shapes corresponding to the generally rounded engagement surfaces of the second keybars such that the second stator core can be securely supported in the main support structure by the second keybars. The filament includes a wire having a resistance rating less than about 12 ohmsm and is configured in a pattern including at least two windings that are spaced apart a distance less than about 6 mm. A communications monitoring system which includes a packet input means for connecting to predetermined points on a network via a network interface and receiving communications packets flowing at the points; and matching means for performing real-time matching between two packet streams composed of received communications packets each time a communications packet is received.