JPS6269756A - Plural circuit switching system for automatic calling device - Google Patents

Abstract

PURPOSE:To share only one dial signal transmission control part and one modulation part even in plural circuits by providing a circuit switching relay, etc., switching a circuit with the aid of a circuit switching signal from a main control part. CONSTITUTION:For switching the circuit, the circuit is switched by the circuit switching signal 5 from the main control part 13 through the circuit switching relay 8. When the circuit A is selected and a call is carried out, a dial signal is outputted to the circuit A from a dial signal transmission control part 9 with the aid of a dial transmission instruction signal 1 from the control part 13. Then the circuit A is switched to the control part 9 from a demodulation and modulation part 12 through an incoming detecting part A10, etc., and communications are made through a data signal line 6. The detecting part A10 detects even the incoming call, and the circuit is selected by the signal 5, thereby attaining communications. If the circuit B is selected, an incoming detecting part B11 detects the incoming call, and it is processed in the procedure the same as the circuit A. By providing the relay 8, etc., only one control part 9 and one demodulation and modulation part 12 can be effectively used.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a multiple line switching system in an automatic calling device having a backup line.

(Prior Art) Fig. 3 is a block diagram showing an example of the configuration of a conventional automatic calling device that uses one line for normal use and one line for backup. It has a detection section, and a modulation/demodulation section is also implemented for each line. When transmitting, the line to be used is selected by a dial sending instruction signal 101 (when line A is selected) or 102 (when line B is selected) from the main control section 117. The dial signal output from dial signal transmission control section 111 or 112 is transmitted to line A or line B (call origination). Whether or not the line is connected to the other party is determined by the incoming call detection unit 113 (when line A is selected) or 114
(when line B is selected), and notifies the main control unit 117 by the incoming signal 103 or 104, respectively. After the incoming call is detected, when line A is selected by the switching signal 109 from the main control unit 117, a switching instruction is issued to the modulation/demodulation unit (A) 15 through the relay switching signal 108, and the relay CMLA is activated through the relay drive signal 105. Relay contacts cmla1 and cmla2 operate. Then, the line A is transmitted from the dial signal transmission control unit (A) 111 to the modulation/demodulation unit (A).
) 15 side, and communication is performed via the data signal line 107. When line B is selected, the circuit in the lower half of FIG. 3 operates in the same manner as described above.

When an incoming call is received, the incoming call detection unit (A) 113 detects the incoming call and notifies the main control unit 117 using an incoming call signal 103. When line A is selected by the switching signal 109 of the main control unit 117, the modem unit (3
) 15, relay CMLA operates through relay drive signal 105, and relay contacts cmla1 and c
mla2 works. The line A is then switched from the side of the dial signal transmission control unit (5) 111 to the side of the modem unit 15, and communication is performed through the data signal line 107. When line B is selected when receiving a call, the circuit in the lower half of FIG. 3 operates in the same manner as described above.

(Problem to be Solved by the Invention) However, in the device with the above configuration, when increasing the number of backup lines, the dial signal sending control unit, incoming call detection unit, and modem unit each have a 1:1K correspondence with the line. ,
The disadvantage was that each part had to be increased at the same time as the number of lines was increased.

The present invention eliminates the above-mentioned problem of an increase in the number of dial signal transmission control units and modulation/demodulation units due to an increase in the number of lines, and makes it possible to effectively utilize a single dial signal transmission control unit and modulation/demodulation unit even for multiple lines. The purpose is to provide

(Means for Solving the Problems) The feature of the present invention for achieving the above object is that in an automatic calling device for a line selected from a plurality of lines including at least one backup line, the automatic calling device is provided in common to each line. A single dial signal transmission control section and a single modulation/demodulation section are provided, and the purpose is to connect the dial signal transmission control section and modulation/demodulation section to a selected line according to instructions from a line switching signal.

(Function) In the above configuration, when making a call, the serial signal sending control unit is selected by the line switching signal from the main control unit and connected to the stopped line, and then, after detecting an incoming signal from the line, the modem is switched on. Connected to the previously selected line. When an incoming call is received, after detecting the incoming signal, the main control section sends out a line switching signal, and the line selected by the signal is connected to the modem. Therefore, a single dial signal transmission control unit and modem device can perform all automatic calls to lines having a plurality of backup lines.

(Example) FIG. 1 is a block diagram showing an embodiment of the invention.

The line switching relay 8 is activated by the line switching signal 5 from the main control unit 13, and the line switching relay contacts 5e11 + 5e1
2 operates and switches the line. When line A is selected,
In order to make a call, a dial signal is output from the dial signal sending control section 9 to line A in response to a dial sending instruction signal 1 from the main control section 13 (calling). Whether or not the line has been connected to the other party is monitored by the incoming call detection section (A) 10 and notified to the main control section 13 using the incoming call signal 2. After detecting the incoming call, the modem unit 12 transmits the relay switching signal 7 from the main control unit 13.
When instructed to, relay CMLA operates through relay CML drive signal 4, and contact cmla4 of relay CMLA
+cmla2 works. The line A is then switched from the dial signal transmission control section 9 to the modulation/demodulation section 12, and communication can be performed through the data signal line 6.

When an incoming call is received, the incoming call detection unit (4) 10 detects the incoming call and notifies the main control unit 13 by an incoming call signal 2. Main control unit 13
When the line on which the call was received is selected by the line switching signal 5 from , and the modem section 12 is instructed to switch through the CML signal 7, the line is switched to L/-CML through the relay CML drive signal 4.
A51 is activated, and its contacts cmla1 and cmla2 are activated.

When line B is selected, the incoming call detection unit (B) 11 monitors incoming calls instead of the above-mentioned incoming call detection unit 10, and performs all the same operations as described above.

FIG. 2 is an example of a specific circuit diagram of the relay circuit 8 indicated by the dotted line in FIG. The line switching relay 53 is the line switching signal 5
works when it is at a high level. Relay CMLA 51 operates when relay CML drive signal 4 is at high level and line switching signal 5 is at high level.

Relay CMLB 52 operates when relay CML drive signal 4 is at high level and line switching signal 5 is at low level.

In the above embodiment, the case where the number of lines is 2 (1 normal line and 1 backup line) is explained, but when the number of lines is 3 or more, the relay circuit 8 is slightly modified and the dial signal sending control section is used. , and the modulation/demodulation unit may be connected to one line selected from a plurality of lines.

In this case, it is necessary to provide the number of incoming call detectors 10.11 equal to the number of lines.

(Effects of the Invention) As described above, according to the present invention, regardless of the number of backup lines, one dial signal transmission control section, one modulation/demodulation section, and one connection code to the modulation/demodulation section are sufficient. Therefore, cost reduction and miniaturization of the automatic calling device with a backup line can be expected.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an automatic calling device having a backup circuit according to the present invention, and FIG. 2 is a circuit diagram of the main part of the present invention.
FIG. 3 is a block diagram of a conventional automatic calling device. 5; Line switching signal, 9: Dial signal sending control unit, 10
, 11; incoming call detection unit; 12; modulation/demodulation unit; 13; main control unit.

Claims (1)

[Scope of Claims] An automatic calling device for a line selected from a plurality of lines including at least one backup line, comprising a single dial signal transmission control unit and a modem unit provided in common for each line, and a line switching unit. A multi-line switching system in an automatic calling device, characterized in that the dial signal sending control section and the modulation/demodulation section are connected to a selected line according to a signal instruction.