Transmitter for ISDN S-bus interface circuit
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United States of America Patent
Stats
-
Jan 10, 1989
Grant Date -
N/A
app pub date -
May 22, 1987
filing date -
May 26, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In the future ISDN network, up to eight subscriber terminals for speech, data and image traffic can be connected to the network terminating circuit (NT). The interface between the subscriber terminals and the network terminating circuit - the S-interface - is specified in CCITT Recommendation I.430. The transmitter in the S-interface must satisfy many, sometimes conflicting, requirements. This is satisfied to an optimum extent by providing the transmitter with a bridge circuit formed by semiconductor switching elements which are controlled by a digital control circuit. According to the invention, the output current of the transmitter is maintained substantially constant with the aid of a differential amplifier connected to the bridge circuit.
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