Pulse or digital communications – Transceivers – Transmission interface between two stations or terminals
Reexamination Certificate
1998-03-03
2002-06-25
Chin, Stephen (Department: 2634)
Pulse or digital communications
Transceivers
Transmission interface between two stations or terminals
C375S222000, C370S522000
Reexamination Certificate
active
06411648
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a communication apparatus that enables communication, for example, in accordance with ITU-T Recommendation V.34.
2. Related Background Art
Conventionally, in the ITU-T V series of recommendations, retraining procedures are defined as a recovery operation that is to be performed for a communication error during the individual procedures.
However, while the definition for a retraining procedure via a control channel is included in, for example, the standards in the ITU-T Recommendations V.8 and V.34, it is not clear from which side a retrain signal should be transmitted when the procedure is to be actually executed. When a retrain signal is voluntarily transmitted from either side, the signals will conflict and the correct retrain procedures can not be performed.
SUMMARY OF THE INVENTION
To overcome the above problem, it is one object of the present invention to provide an improved communication apparatus.
It is another object of the present invention to appropriately perform retraining processing when communication errors occur on a control channel.
It is an additional object of the present invention to appropriately perform communication on a control channel.
The other objects of the present invention will become apparent during the course of the detailed description of the preferred embodiments, given while referring to the accompanying drawings.
REFERENCES:
patent: 5025469 (1991-06-01), Bingham
patent: 5721731 (1998-02-01), Yoshida
patent: 5903602 (1999-05-01), Torkkel
patent: 6081510 (2000-06-01), Valentine
patent: 6236469 (2001-05-01), Watanabe et al.
patent: 6314170 (2001-11-01), Noguchi et al.
Canon Kabushiki Kaisha
Chin Stephen
Fitzpatrick ,Cella, Harper & Scinto
Ha Dac V.
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