| 摘要 |
PURPOSE: A device for converting a clock for measurement is provided to receive a predetermined frequency of standard clock signal from a GPS(Global Positioning System) or a cesium atomic clock, and to receive a bipolar clock signal from a tested apparatus, so as to convert the bipolar clock signal into a unipolar clock signal recognizable by a meter. CONSTITUTION: A DS1 clock converting part(210) converts a framed DS1 clock into an unframed DS1 clock. A DS1E clock converting part(220) converts a framed DS1E clock into an unframed DS1E clock. A clock synthesizing part(230) synthesizes reference clocks synchronized with a standard time, to generate a DS1 reference clock and a DS1E reference clock. In the DS1 clock converting part(210), a transformer(211) receives clocks of a tested object such as clocks of an exchange or an optical transmission apparatus. An error monitor operated with clocks of a clock oscillator converts a bipolar clock inputted through the transformer(211) into a unipolar clock and analyzes frames to detect LOS(Loss Of Signal), AIS(Alarm Indication Signal), BPV(BiPolar Violation) and OOF(Out Of Frequency). And LEDs(Light Emitting Diodes) indicate errors according to outputs of the error monitor.
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