This study was made to clarify the understanding of the concept of a channel or channel capacity issues in digital communication systems. According to the theory that the channel capacity is affected by the level of information signal and noise or disturbance. Measuring instruments that had been used only measures signal strength regardless of size or width of transmission line or how much external noise on the channel and signal level. In connection with this it should be there is a technique for measuring the capacity of the channel to be used for digital communication system taking into account the parameters used and the level of signal noise that occurs in the transmission line.
The study is in the form of a model to measure the capacity of the channel under the influence of signal and noise levels. This method is a prototype both hardware and software support, which can measure the channel capacity with different parameters with optimal levels of reliability. The results of this study consists of modules for a variety of parameters such as signal and noise levels. The benefits of this research will provide information on the amount of channel capacity digital communication systems due to the signal level information, Bandwidth, SNR (Signal to Noise) and BER (bit error rate).