Fujitsu Corporation

Ryuhei Motono

Kazuo Sato

Yuzo Okuyama

Yamato Tachibana

Kazuo Takeoka

An HDB3 code violation detector includes a converting part for receiving positive polarity data and negative polarity data from a PCM line and for converting an HDB3 code received via the PCM line into an NRZ signal, and a first judging part receiving the positive polarity data, the negative polarity data and the NRZ signal, for judging whether or not a pattern of the NRZ signal received from the converting part is possible when the NRZ signal is NRZ '1' and for outputting a judgement result. In addition, the detector includes a second judging part receiving the positive polarity data, the negative polarity data and the NRZ signal, for judging whether or not a pattern of the NRZ signal received from the converting part is possible when the NRZ signal has a maximum of three consecutive NRZ '0's and for outputting a judgement result. Further, the detector includes a third judging part receiving the positive polarity data, the negative polarity data and the NRZ signal, for judging whether or not a pattern of the NRZ signal received from the converting part is possible when the NRZ signal has at least four consecutive NRZ '0's and for outputting a judgement result, and a detecting part for detecting a code violation of the HDB3 code based on the judgement results of the first, second and third judging parts.

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Sapporo, Japan

Ryuhei Motono