Process for determining whether a subscriber is the calling or t

Details Process for determining whether a subscriber is the calling or t Process for determining whether a subscriber is the calling or t

1989-09-22

1991-08-06

Ng, Jin F.

Textiles: fiber preparation

Working

Carding

H04M 1100

Patent

active

050383736

ABSTRACT:
A process is disclosed for the transmission of data between subscribers of a public dial telephone system in which at least a telephone, a data modem having a tone transmitter and a tone receiver, and a data device are connected to the dial telephone system. The data modem is equipped with a circuit for ringing voltage detection with bridging of ringing pauses. For transmission of a data answering tone and, if applicable, for selection of a channel position, in the case of manual operation, after operation of a data key, a distinction between the `called` state and `calling` state is made according to whether, at the start of loop current, a ringing voltage was detected by the data modem or not.

REFERENCES:
patent: 4304970 (1981-12-01), Fahey et al.
patent: 4578796 (1986-03-01), Charalambous et al.
patent: 4805213 (1989-02-01), Schlanger

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