Bit Error Rate Testers, or BERT, test for elements of a data stream that, while being transferred over a transmission channel, have been interferred with by bit error. Bit errors arise from noise, distortion, failed bit synchronization, and other anomalies. Bit Error Rate Testers determine the rate of error in the transmissions of devices with gigabit interfaces, determining the compatibility of the connection. A BERT tests comprehensively; the transmitter, receiver and the medium between these two components are all measured to gain a holistic view of system performance. Applications include the assessment of fiber optic links, Ethernet connections and a variety of digital and radio communications systems, all of which require bit error rate testing to ensure the connection is clean.