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US 5,113,396 AGranted
Interface for ISDN channels
AssigneeCanon Kabushiki Kaisha
InventorNaoto Kagami
Life of this patent
Estimating the term…
Abstract
A line interface for ISDN channels converts an analog signed from an analog communication terminal to digital data and sends the converted digital data to a B-channel of ISDN. The digital data from the B-channel of ISDN is converted to an analog signal and the converted analog signal is then sent to the analog communication terminal.
Claims13
An interface for ISDN channels, comprising:
- means for converting an analog signal from an analog communication line connected to an analog communication terminal into digital data and sending the digital data to a B-channel of ISDN;
- means for converting digital data from the B-channel of ISDN into an analog signal and sending the analog signal to said analog communication line;
- means for detecting a DC loop on the analog communication line;
- means for receiving a dial signal from the analog communication terminal;
- and
- means for controlling connection to the B-channel of ISDN in response to both formation of the DC loop on the analog communication line and the dial signal from the analog communication terminal and for controlling release of the B-channel of ISDN in response to release of the DC loop on the analog communication line.
3 more elements
An interface for ISDN channels, comprising;
- a first terminal for connecting to an analog communication line;
- a second terminal for connecting to ISDN channels;
- A/D convertor means for converting an analog signal from the analog communication line into digital data and sending the digital data to a B-channel of ISDN;
- D/A convertor means for converting digital data from the B-channel of ISDN into an analog signal and sending the analog signal to the analog communication line;
- means for detecting a DC loop on the analog communication line;
- means for receiving a dial signal from the analog communication line;
- and
- means for controlling connection to the B-channel of ISDN in response to both formation of a DC loop on the analog communication line and the dial signal from the analog communication line and for controlling release from the B-channel of ISDN in response to release of the DC loop on the analog communication line.
5 more elements
An interface connected between an analog communication line and ISDN channels, comprising;
- means for converting an analog signal from the analog communication line into digital data and sending the digital data to a B-channel of ISDN;
- means for converting digital data from the B-channel of ISDN into an analog signal and sending the analog signal to the analog communication line;
- first detection means for detecting a loop on the analog communication line;
- second detection means for detecting call information from the analog communication line;
- means for generating a call signal and sending the call signal to the analog communication line;
- and
- means for controlling connection to the B-channel of ISDN in response to both formation of the loop on the analog communication line and the call information, and for controlling release from the B-channel of ISDN in response to release of the loop on the analog communication line.
4 more elements
Dependencies are inferred from the claim text.