A multi-purpose modular RJ connector includes a female receptacle having an opening in which a printed circuit board having contact pads on opposite surfaces thereof is positioned. Also, a lighting lamp is provided in which a plurality of LED lighting modules are combined to enable wide light distribution, and heat generated from the lighting lamp can be convected through a plurality of vent holes formed in all side surfaces of the lamp to achieve improved illumination efficiency and lengthen the lifespan of the lamp to tens of thousands of hours. In an engine having electronically actuated intake andor exhaust valves, intake airflow is estimated based on at least engine speed and valve timing and compared to a measured intake airflow to determine a first difference. The through hole has a polygonal cross section when viewed along a longitudinal axis of the gain medium. In the event it is established that a developer station was not need or will not be needed for a predetermined time span, the developer station is shifted into a standby state in which at least one part of mechanical actuators of the developer station is stopped. As such, the brake pedal is retained at the park position when the coupler and the actuator pedal are engaged with the retainer.