Transmitter for ISDN S-bus interface circuit

Details Transmitter for ISDN S-bus interface circuit Transmitter for ISDN S-bus interface circuit

1987-05-22

1989-01-10

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

370 24, 375 7, 375 17, 375 36, H04L 2700

Patent

active

047979046

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.

REFERENCES:
patent: 4280221 (1981-07-01), Chun et al.
patent: 4606046 (1986-08-01), Ludwick
patent: 4649548 (1987-03-01), Crane

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