Pulse or digital communications – Repeaters – Testing
Patent
1990-09-18
1992-03-03
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 27, 3701102, 36518902, H04B 1402
Patent
active
050938452
ABSTRACT:
A signal generator for generating pulse signals having a waveform required by the Recommendation of International Telegraph and Telephone Consultative Committee (CCITT) is disclosed. The signal generator utilizes two D/A converters whereby the limitation of the operable frequency of the D/A converters restricts the variation rate of the output pulses. Each D/A converter provides the converted analog signal to the pulse transformer at timings different from one another. The pulse transformer detects the difference between the provided analog signals and provides a pulse signal having the required waveform. The difference of the output voltages between the two D/A converters varies at two times the operable frequency rate of the D/A converters, resulting in the pulse signals changing at a rate exceeding the operation frequency of the D/A converters.
REFERENCES:
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patent: 4774692 (1988-09-01), Oishi et al.
patent: 4825416 (1989-04-01), Tam et al.
Hardwick, "ISDN Design: A Practical Approach", Academic Press, Inc., Harcourt Brace Javanovich, Publishers.
AT&T Preliminary Data Sheet, "LC1046 Digital Signalling Interface".
Recommendation I.431, CCITT.
Kondoh Harufusa
Nakabayashi Takeo
Mitsubishi Denki & Kabushiki Kaisha
Safourek Benedict V.
Tse Young
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