Violation control circuit in ISDN
AssigneeAndo Electric Co., Ltd.
InventorAkira Seki
Life of this patent
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Abstract
The present invention discloses a violation control circuit for a frame alignment of a basic interface in ISDN. The violation control circuit comprises selectors having inputs connected to positive and negative pulse transmission signals, a selector control circuit for providing control signals for selectively connect the inputs of the selectors to outputs of the selectors. The violation control circuit further comprises a U-B converter for receiving the outputs of the selectors, a transmission transformer for receiving an outut of the U-B converter, a receiving transformer for receiving a receiving pulse, a B-U converter for receiving an output of the receiving transformer, and an INFO detecting circuit to be connected to an output of the B-U converter.
Claims7
A violation control circuit is ISDN comprising:
- a first selector having a first input connected to a negative polarity pulse transmission signal and a second input connected to a positive polarity pulse transmission signal;
- a second selector having a first input connected to the positive polarity pulse transmission signal and a second input connected to the negative polarity pulse transmission signal;
- a selector control circuit for providing a first control signal which causes said first selector to connect the first input of the first selector to an output of the first selector and causes said second selector to connect the first input of the second selector to an output of the second selector, and for providing a second control signal which causes said first selector to connect the second input of the first selector to the output of the first selector and causes said second selector to connect the second input of the second selector to the output of the second selector;
- a unipolar to bipolar converter for receiving the output of the first selector and the output of the second selector;
- a transmission transformer for receiving an output of the unipolar to bipolar converter;
- a receiving transformer for receiving a receiving pulse;
- a bipolar to unipolar converter for receiving an output of the receiving transformer;
- and
- an INFO detecting circuit connected to an output of the bipolar to unipolar converter.
An apparatus according to claim 5, wherein said selector control circuit includes means for varying the relative periods of time during which said select signal is respectively in said first logical state and said second logical state.
Dependencies are inferred from the claim text.