Patent ID: 6782353
Filing Date: 2004-08-24
Classification: H04L

Abstract:
A measuring device comprising:a data converter which converts a data signal transmitted at a predetermined carrier wave frequency from an NRZ method data signal to an RZ method data signal; a band-pass filter which extracts a signal component having a frequency the same as that of a clock signal to be regenerated from the RZ method data signal converted by the data converter, and has a predetermined band characteristic regulated in accordance with the predetermined carrier wave frequency; a binarizing circuit which binarizes, at a predetermined threshold value, the signal component extracted by the band-pass filter, and outputs a binarized signal as the clock signal to be regenerated, and when there is a period in which the data signal inputted to the band-pass filter continues for a plurality of bits at the same level, the binarizing circuit being configured so as to compensate for absence of the clock signal during the period by binarizing, at the predetermined threshold value, the signal which the band-pass filter outputs during the period due to relaxation vibration at an interior of the band-pass filter with respect to the data signal inputted until immediately before the period; and a calculating module which calculates at least one of an error ratio, jitter, and wander accompanying transmission of the data signal, based on the clock signal outputted from the binarizing circuit.