A communication system included in a telematics unit is provided. The main sprocket has a circumferential drive rim around which the drive assemblies are mounted in driving engagement with the drive rim so as to selectively rotate the main sprocket relative to the frame. The adapter card may include a front end data channel coupled with the interface core for transmitting a data packet between the electronic components and the information handling system device. The second clamp can be selectively engaged with and disengaged from the depth gage. The device further include a control unit which applies a first voltage to a gate electrode of the n-channel MOS transistor, thereby setting the n-channel MOS transistor in an ON state, and applies a second voltage which is higher than the first voltage, to the gate electrode during a period after first sense and before second sense. Each layer pair includes an InGaN layer and pit-filling layer in direct contact with the InGaN layer.