JPH03174855A - Dial pulse signal dialing control system - Google Patents

Abstract

PURPOSE:To prevent mis-connection or malfunction of an exchange by stopping the transmission of a DP (dial pulse) signal in response to the transmission state when the DP signal is dialed automatically. CONSTITUTION:A control circuit (CNT) 4 stores a dial number data to be dialed and given from other circuit, and compares the corresponding between the data and a pulse detection data from a DP reception circuit (DPR) 5 by each digit. When the corresponding does not exist or no pulse detection data is generated within a prescribed time, the control circuit gives a command to an automatic dialing circuit (ASD) 3 immediately to stop the succeeding transmission of the DP signal and to open a contact l thereby opening the DC loop and restoring the exchange. Thus, malfunction and mis-connection of the exchange are avoided.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a transmission control system that, when automatically transmitting a dial pulse (hereinafter referred to as DP) signal, stops transmitting a DP flaw signal depending on the transmission status of the dial pulse (hereinafter referred to as DP) signal. It is related to the method.

[Conventional technology]

DP to the telephone line connected to the exchange that responds to the DP damage signal
When transmitting a damage signal, recently integrated control circuits and automatic transmission circuits have been used, and each of these circuits automatically responds to the operation of a numeric keypad or the designation of a number registered in memory. It is designed to send a DP damage signal.

[Il1 problem that the invention attempts to solve] However, the transmitted D? Wound signal schedule and t? , 9, etc. There is no particular means for monitoring whether the DP fault signal is sent due to an abnormality in each circuit, and if a faulty DP signal is sent out incorrectly, an incorrect connection or malfunction of the exchange will occur, resulting in a loss of call charges. Alternatively, there are drawbacks such as an increase in invalid traffic due to unnecessarily monopolizing telephone lines.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention is constructed by means of a bridge.

That is, in the above-mentioned automatic calling system, there is a means for detecting a DP flaw signal sent out in response to a change in the voltage of the telephone line, and a means for comparing the pulse detection data detected by this means with the dial number data to be called. and means for stopping the transmission of the DP flaw signal when the comparison results of the means do not correspond to each other.

[Effect]

Therefore, the number of pulses transmitted for each digit is compared with the dial number to be transmitted, and if the two do not correspond, subsequent DP signal transmission is stopped.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to block diagrams showing embodiments.

In the figure, a contact point t for completely closing the DC loop is provided in a subscriber circuit (hereinafter referred to as LIF) 2 to which a telephone circuit 1 from an exchange is connected, and an automatic calling circuit (
Hereinafter, A8D) 3 turns on and off the DC loop according to commands from the control circuit (hereinafter referred to as CNT) 4, and thereby f
It is used to transmit iDP signals.

In addition, a DP receiving circuit (hereinafter referred to as DPR) is located near the contact point t.
5 is connected, this detects the DP flaw signal actually sent out in response to the line voltage change of the telephone line 1 due to the on/off of the DC loop, and this pulse detection data 1kcN
It is given to T4.

Regarding CNT4, the dial number data to be called given from other circuits is stored in memory etc.
The correspondence between this data and the pulse detection data from the DPR5 is compared for each digit, and if the results do not correspond to each other, or if no pulse detection data is generated within a certain period of time, an immediate command is given to the ASD3. , the subsequent DP signal transmission is stopped, contact t is turned off to open the DC loop, and the exchange is fully restored.

Therefore, if there is an abnormality in ASD3, CNT40
If a number of pulses different from the command is sent out, or if the sending of pulses is delayed, the DP fault signal transmission will be immediately stopped by 4 m and the DC loop will be opened, and the exchange will be restored.
No exchange malfunctions or incorrect connections occur.

〔Effect of the invention〕

As is clear from the above explanation, >6 According to the present invention, a DP flaw signal sent out in response to a change in the voltage of a telephone line is detected, this pulse detection data is compared with the dial number data to be sent, and the result is By stopping the DP failure signal transmission when they do not correspond to each other, malfunctions and incorrect connections of one exchange are eliminated, and there is no increase in invalid traffic or loss of call charges, etc., which is noticeable in the DP failure signal transmission control. You can get the following effect.

[Brief explanation of drawings]

The figure is a block diagram showing an embodiment of the present invention. 1...Telephone line, 3...Automatic dialing circuit, 4...
...Control circuit, 5...DP receiving circuit, t...Contact. Special pestle applicant: NEC Co., Ltd. Japan Telecommunications System Co., Ltd. Agent Masaki Yamakawa

Claims (1)

[Claims] In the method of automatically transmitting dial pulse signals,
means for detecting a dial pulse signal sent out in response to voltage changes on a telephone line; means for comparing pulse detection data detected by the means with dial number data to be transmitted;
A dial pulse signal transmission control system comprising means for stopping transmission of the dial pulse signal when the comparison results of the means do not correspond to each other.