JPH03167946A - Dial sending system to communication line - Google Patents

Abstract

PURPOSE:To continue discrimination to select a communication line for the cheapest charge even when a dial input to an adaptor is slow by outputting a tentative number before the operation end elapse time of a line when it is discriminated that a communication line with the cheapest utility charge is selected. CONSTITUTION:A line timer is started in response to an off-hook detection signal from an adaptor at a line side. When a telephone set enters a toll number to a terminal 10, a loop current detection circuit 8 receives the dial pulse and gives it to a microcomputer 9. The microcomputer 9 discriminates whether or not the LCR line is selected based on the entered toll number and discriminates whether or not timeout of the line is close before the end of discrimination and a pushbutton signal of a tentative 1-digit number such as '0' is generated from a pushbutton signal generating circuit 3 when the timeout is close to start the line timer again.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dial sending method to a communication line, and in particular, in response to dialing of an area code, a call is sent to a terminal device on the same line with 1 ≦ The present invention relates to a dial transmission method for communication, in which a connected adapter sends a dial signal for selecting a four-line communication line with low charges.

[Conventional technology] Recently, companies other than NTT (Nippon Telegraph and Telephone Corporation) have been allowed to use public communication lines, making it possible to use communication lines at lower rates than NTT's long-distance telephone lines. There is. When using such a low-cost communication line (hereinafter abbreviated as LCR), it is necessary to provide the telephone with an adapter. When using LCR, it is necessary to manually enter a number that has more digits than the area code of the next person within a predetermined LCR determination operation time.

FIG. 4 is a timing diagram for explaining the operation of sending a dial signal from a conventional LCR adapter. Referring to FIG. 4, when the handset is picked up from the telephone, the telephone goes off, counting of the LCR determination operation time begins, and a dial tone signal is returned from the line. Press the dial or press button on the telephone, select, for example, RO 5 3 3J as the area code, and then manually enter the destination's local area code and subscriber number. When the area code is input, the adapter performs LCR determination.

[Problem to be solved by the invention] However, with the conventional adapter, the area code must be entered within a predetermined time after off-hook, and the L
If a timeout occurs during the CR determination operation time, a busy tone signal will be returned from the line, and subsequent dialing will be invalidated.

Therefore, if dialing the adapter is slow,
There was a problem in that it was not possible to connect to a line network with low usage charges.

Therefore, the main object of the present invention is to provide a dial transmission method to a communication line that can perform an LCR judgment operation even when dial input to an adapter is slow, and that can enable connection to a line with low charges. It is.

[A Thousand Steps to Solve the Problem] In this invention, in response to a dial signal of an area code being sent within a predetermined time, an adapter connected to a terminal device of a communication line selects that line. A temporary one-digit number is output to the communication line just before a predetermined period of time has elapsed,
The feature is that the time between digits until the next number is sent to the communication line can be used to determine the cheapest communication line, and the determination operation time is made longer than the predetermined time. do.

[Function] The dial sending method to the communication line according to the present invention outputs a temporary one-digit number to the line side before the end of line operation time elapses, and charges the time between digits until the next number is sent. To enable connection to the cheapest communication line by determining the use of the cheapest communication line even when dialing an adapter is slow.

[Embodiments of the invention] FIG. 1 is a schematic block diagram of an embodiment of the present invention.

First, the configuration of an embodiment of the present invention will be described with reference to FIG. A communication line is connected to the line terminal 1. A signal from the communication line inputted to the line terminal 1 is applied to a loop holding circuit 2 and a dial tone detection circuit 4. The loop holding circuit 2 holds the line loop current, holds the office line, and sends dial pulses to the line. A dial tone detection circuit 4 detects a dial tone sent from the line. A pushbutton signal generated from a pushbutton signal generation circuit 3 is applied to the loop holding circuit 2 . The loop holding circuit 2, push button signal generating circuit 3, and dial tone detecting circuit 4 are connected to a microcomputer 9. The microcomputer 9 judges received signals, sends out signals, and controls various operations.

Further, a current supply circuit 5 is provided for supplying electric current to the terminal device, and the current supplied from the current supply circuit 5 is applied to the terminal terminal 10 via a loop current detection circuit 8. Furthermore, a dial tone sending circuit 6 sends out a dial tone signal in response to a signal from the microcomputer 9, and a push button signal receiving circuit 7 receives a push button signal sent from a terminal device.
will be provided. The loop current detection circuit 8 detects off-hook of the terminal device, simultaneously receives dial pulses, and provides the output to the microcomputer 9.

FIG. 2 is a timing diagram for explaining the operation of an embodiment of the present invention, and FIG. 3 is a flow diagram for explaining the same operation.

Next, with reference to FIGS. 1 to 3, a specific operation of an embodiment of the present invention will be described.

When the handset of a telephone, which is a terminal device, is picked up, it goes off-hook, and the off-hook is connected to the loop current detection circuit 8.
detected by. Loop current detection circuit 8 provides an off-hook detection signal to microcomputer 9. The microcomputer 9 outputs an off-hook detection signal from the loop holding circuit 2 to the line via the line terminal 1. On the line side, a line timer is started in response to an off-hook detection signal from the adapter.

When an area code is input from the telephone to the terminal terminal 10, the loop current detection circuit 8 receives the dial pulse and supplies it to the microcomputer 9.

Microcomputer 9 reads LCR with the entered area code.
Performs LCR judgment to determine whether line selection is possible or not,
Before the LCR judgment ends, it is determined whether the line is about to time out or not, and if the line timeout has a sufficient margin, the LCR judgment is continued. When the line is about to time out before the LCR judgment is completed, the micro corrector 9 presses a push button signal of a temporary one-digit number, for example 0, to the button signal generation circuit 3.
Generate from. The loop holding circuit 2 responds to the push button signal generated by the push button signal generating circuit 3 and sends out dial pulses to the line. On the line side, when a dial pulse for the temporary number O is sent, the line timer is started again. microcomputer 9
Then, in response to dial pulses sent from the telephone, LCR determination is performed. As a result of the LCR determination, if it is determined that the number is an LCR number, the terminal device is connected to a low-cost line network, and the dial pulse of the destination manually inputted from the terminal device is outputted from the press button signal signal generation circuit 3. The loop holding circuit 2 outputs a dial pulse to the line in response to the push button signal.

[Effects of the Invention] As described above, according to this author, when making a decision to select a communication line with the lowest usage fee in response to the area code or human input, the operation of the line is Since the provisional number is output n5 minutes before the end of the process, it is possible to restart the counting of the predetermined time and lengthen the determination time.
Even if the dial input to the adapter is slow, it is possible to continue the determination to select a communication line with a low usage fee, and it is possible to connect to a line network with a low fee.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of an embodiment of the present invention. FIG. 2 is a timing diagram for explaining the operation of one embodiment of the present invention. FIG. 3 is a flow diagram for explaining the operation of one embodiment of the present invention. FIG. 4 is a timing chart for explaining the conventional dial sending operation. In the figure, 1 is a line terminal, 2 is a loop holding circuit, 3 is a push button signal generation circuit, 4 is a dial tone detection circuit, 5 is a current supply circuit, 6 is a dial tone output path, and 7 is a push button signal A receiving circuit, 8 a loop current detection circuit, 9 a microcomputer, and 10 a terminal terminal.

Claims (1)

[Scope of Claims] An adapter connected to a terminal device of a communication line selects the communication line with the lowest charge in response to a dialing signal of an area number being sent within a predetermined time. , Immediately before the predetermined time elapses, a temporary one-digit number is output to the communication line, and the inter-digit time until the next number is sent to the communication line is a judgment operation for selecting the communication line with the lowest charge. 1. A method for sending a dial to a communication line, characterized in that the determination operation time is longer than the predetermined time.