JPS63200949U - - Google Patents

Description

[Brief explanation of drawings]

Figure 1 is a circuit configuration diagram of one embodiment of the present invention;
The figure is a detailed view of the main parts, and FIG. 3 is an operation timing diagram. In the figure, 1 is a telephone line, 2 is an AA type NCU, 3 is a modem, 4 is a transmission control unit, 4a is a called party response determination block, 6 is a dial pulse sending circuit, 7 is a called party response detection circuit, 17 represents register A, 18 represents register B, and 19 represents a coincidence detector.

Claims (1)

[Scope of Claim for Utility Model Registration] An automated system comprising a network control device, means for automatically transmitting a dial pulse signal, and means connected in series with the dial pulse transmitter for detecting a response from a called party. In the calling device, a polarity detection means using a photocoupler detects the called party's response, and also stores the line polarity immediately before the call is made and the line polarity after the call is made, respectively, in accordance with the timing before and after dialing. and a comparing means for comparing outputs of the two polarities stored in the storing means, and detecting a called party response by detecting the presence or absence of a change in line polarity by the comparing means. Features an automatic transmission device.