A system and a method for transmitting data between a local data processing system and a remote data processing system through an asynchronous transmission channel. The gear chamber is connected to the bottom of a vertical drive shaft receiving bore formed in the gear case to receive a drive shaft. A method is disclosed for estimating pressure in the brake booster based on operating conditions. The M products that result from the vector multiplication of Z and G are used to determine and store in memory at least one or both of: a flag indicating presence or absence of narrowband interference in the signal; and an estimate of a frequency of the narrowband interference.