A common coexistence timer can be implemented on collocated or proximate wireless radio devices so that timing information associated with scheduled communications of each of the wireless radio devices is communicated with a common time reference. The MAC section comprises a downstream data processing block having a function of substituting for a portion of the process of the CPU, a upstream data processing block having a function of substituting for a portion of the process of the CPU, a bus data arbitration processing block, a CPU bus, the CPU, and a storage apparatus. The orientation, positioning, and alignment of the centrifugal blowers facilitates a compact arrangement of the plurality of blowers that achieves increased aerodynamic efficiencies to reduce noise output and energy consumption. The six torque-transmitting devices provide interconnections between various gear members, the input member and the transmission housing, and are operated in combinations of three to establish eight forward speed ratios and one reverse speed ratio.