The invention relates to a gear unit with hollow shaft for gate drives, preferably for driving sectional and roller gates. The phase shifting process is separated from the duty cycle generation process, thereby easing the task of preserving the duty cycle and phase relationships among the various PWM channels following an asynchronous external synchronization event. A clearinghouse server receives the query and determine a location of the user by accessing a location information database. In addition, the system may include a controller configured to generate a temperature map of the working material of the exhaust treatment device and to determine deviations from an expected temperature map. , an optical duobinary signal having a bit rate greater than about 80 Gbs. The tubing members can be a completion tool, tubing, or a combination of both.