PROTOCOL AND BIT RATE INDEPENDENT TEST SYSTEM

摘要

A protocol and bit rate independent test system includes a means for detecting bit errors on a digital communications channel regardless of format or rate. The system includes an optical receiver (10) for receiving an input signal, a clock recovery unit (12), a threshold-sampling circuit (18) and an error detection unit (20). The threshold sampling circuit (18) includes at least two threshold detectors for respective sampling points and phase adjustment units controlled by the output of the clock recovery unit (12). If the signal passes between a predetermined threshold, the error detection unit (20) generates a signal which is fed to a counter.