HDB3 code violation detector

Details HDB3 code violation detector HDB3 code violation detector

1991-09-06

1994-02-08

Beausoliel, Jr., Robert W.

Excavating

341 68, 341 94, G06F 1100, H03M 506, H03M 1300

Patent

active

052854590

ABSTRACT:
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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Wysochi, Tadeusz Jr., "Spectral Analysis of the 3T4B Coded Signal" Inst. of Telecomm., 1988, pp. 625-628.
Tanik et al., "Modification of a Radio Link System From Analog to Digital", ISCAS 1988 pp. 1337-1339.
Wray et al, "Chip Set Simplifies Linking T1 or /SDN Lines to PBXs" Electronic Design, Aug. 20, 1987 pp. 111-115.
"General Aspects of Digital Transmission Systems; Terminal Equipments", IXth Plenary Assembly, Nov. 1988.

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