JP2002359679A - Telephone line connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a conventional telephone line connection method has required for a user to manually set line parameters. SOLUTION: Whether a telephone line is an extension or an external line is discriminated based on a call tone from the telephone line, when the external line is detected, a prescribed DTMF (dual tone multi frequency) tone or a pulse signal is transmitted and the presence/absence of a call tone is detected to discriminate whether the telephone line is a tone line or a pulse line. When it is discriminated that the telephone line is the extension, a number of a plurality of objects of external line call numbers set in advance is transmitted by a DTMF tone signal or a pulse signal, the presence/absence of the call tone is detected to discriminate whether the telephone line is a tone line or a pulse line, when no call tone is detected, a succeeding number of a plurality of the objects of the external line call numbers is transmitted and the presence/absence of the call tone is detected. Then the above processing is repeated until the call tone is detected from the telephone line and when the call tone is detected, the number transmitted by the DTMF tone signal or the pulse signal just before the detection is determined to be an external line transmission number.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone line connection method, a telephone line connection program, a recording medium, a semiconductor device, a line identification method, a personal computer connected to a telephone line for data communication, and a modem for an embedded device. And data communication devices such as telephone equipment.

[0002]

2. Description of the Related Art A conventional technique of a modem will be described as an example of a data communication apparatus connected to a public line. When a modem is used for data communication, the user must select the type of telephone line connected to the modem (whether the telephone line is a public telephone line (external line) or an internal line, a tone dial, or a pulse dial with a low rotation speed. Or a pulse dial with a high rotation speed) and perform a setting operation according to it to perform dialing.

[0003] Devices such as BS digital / CS tuners that can be connected to the Internet from a television receiver or the like use a modem to send billing information and the like.

Whether the telephone line connecting the modem is a public telephone line (external line) or an internal line, or a tone dial, a low-speed pulse dial, or a high-speed pulse dial For the setting method to determine whether the
JP-A-8-317075 and JP-B-6-83300
This is described in detail in the official gazette.

Japanese Patent Application Laid-Open No. Hei 8-317075 discloses that a host such as a personal computer causes a modem to temporarily set a dialing, call a known connection partner, and call the connection partner with known contents. A method is described in which the host determines whether or not a response has been made, and sets the dialing method being provisionally set as the final setting method in the modem. In addition, Japanese Patent Publication No. 6-83300 describes a method in which dialing is performed using a plurality of dialing methods when the apparatus is installed, and a dialing method is set based on whether or not a subsequent dial tone has been detected.

[0006]

For example, if the modem is directly connected to a tone-dial public line (public telephone line), dialing is performed using an "ATD" command. Is "ATD
Dialing with the "T" command, and "A" if the modem is directly connected to a pulse-dial public telephone line.
It is necessary to dial using the "TDP" command. Also, the communication speed of the telephone line is low (10 pp
s) or high speed (20 pps)
The pulse speed needs to be set by changing the value 'n' in the 'n' command.

When a modem is connected to an extension, a command in which a comma ',' or 'W' is inserted between an outside line transmission number (0, 9, etc.) and a telephone number following the number. It is necessary to dial using.
Normally, when the telephone line goes off-hook (closed), the modem first checks for a dial tone from the telephone line. If the modem is connected to the extension, the dial tone cannot be detected, and the modem sends “NO DIALTO” to the host.
“NE” code is output, and the dialing operation is stopped.
Therefore, the host needs to set the dialing mode without checking the dial tone from the telephone line. This is normally set by issuing an “ATX3” command.

The setting for checking the dial tone is "ATX4"
Issue a command to set. If the modem is connected to an extension, dial the outside line number (such as 0 or 9) before dialing the number. If you want to use the ',' command, wait for a certain period of time before the next dialing. When a ring is performed or a 'W' command is used, a desired number is dialed after detecting a dial tone from a telephone line. Therefore, if the host does not know the type of telephone line, the host will know that the dialing method is wrong due to the failure of dialing, and has learned in advance the type of telephone line and the dialing method. It is necessary to determine the dialing command above.

Further, since it is not known whether the telephone line is a tone dial, a low-speed pulse dial, or a high-speed pulse dial, many users often use a modem connection line type or dial system. Since it cannot be determined immediately and the operation of the modem setting is repeated until the dialing is correctly performed, the operation of the modem setting takes time.

Devices such as BS digital / CS tuners that can be connected to the Internet from a television receiver or the like use a modem to send billing information and the like. It is difficult to make a modem setting that matches the telephone line in advance, because there are various types of telephone line connection methods, so it is difficult to set a modem that matches the telephone line in advance. It is not troublesome. further,
When dialing an extension, it is necessary to perform dialing with a special command as described above.

According to the method described in Japanese Patent Application Laid-Open No. H8-317075, in order to determine that the dialing method being provisionally set is correct, a known connection partner is finally called and a voice response from the partner is expected. The host needs to determine whether or not it is a known one. In this case, a separate voice determining means for determining whether the voice response is a known one is required, and it takes a considerable amount of time to determine the type of the telephone line, and a wasteful connection cost is required. .

The method described in Japanese Patent Publication No. 6-83300 is a method in which dialing is performed by a plurality of dialing methods when the apparatus is installed, and the dialing method is set by using whether or not a subsequent dial tone is detected. In this,
It is not possible to distinguish between an extension and an outside line and determine the outside line number.

The present invention has been made in view of the above circumstances, and can automatically detect the type of a connected telephone line, and can automatically set line parameter settings without depending on the user. A telephone line connection method, a telephone line connection program, a recording medium, and the like, which enable normal dialing according to the connected telephone line.
A semiconductor device, a line identification method, and a data communication device capable of detecting the presence or absence of connection of a telephone line and outputting a detection result when the telephone line is not connected are provided. The purpose is to provide.

[0014]

According to one aspect of the present invention, there is provided a telephone line connection method for connecting a data communication device to a telephone line, wherein the data communication device is connected to a telephone line. A second step of determining whether the telephone line is an internal line or an external line based on a dial tone from the telephone line connected in the first step, and the second step If it is determined that the telephone line is an outside line, a predetermined DTMF tone signal or pulse signal is transmitted to the connected telephone line, and the presence or absence of a dial tone from the telephone line is detected, thereby detecting the connected telephone line. A third step of determining whether the telephone line is a tone line or a pulse line; and, in the second step, when it is determined that the connected telephone line is an extension, The number of the outside line number candidates is transmitted to the connected telephone line as a DTMF tone signal or a pulse signal, and the presence or absence of a dial tone from the telephone line is detected, whereby the connected telephone line becomes a tone line. And a fourth step of determining whether the line is a pulse line, and if no dial tone is detected in this fourth step, after confirming the dial tone of the closed telephone line, The transmission of the DTMF tone signal or pulse signal of the next number to the connected telephone line to detect the presence or absence of a dial tone from the telephone line means that the dial tone from the connected telephone line is detected. It repeats until the dial tone is detected.
A fifth step of determining a number transmitted by a TMF tone signal or a pulse signal as an outside line transmission number.

According to a second aspect of the present invention, there is provided a telephone line connection program for connecting a data communication apparatus to a telephone line, the first procedure for connecting the data communication apparatus to a telephone line, and the first procedure. A second procedure for determining whether the telephone line is an internal line or an external line based on a dial tone from the telephone line connected to the telephone line. In this second procedure, it is determined that the connected telephone line is an external line. DT
Transmitting an MF tone signal or a pulse signal to the connected telephone line, and detecting whether there is a dial tone from the telephone line to determine whether the connected telephone line is a tone line or a pulse line. 3 procedures and the second
In the procedure, when it is determined that the connected telephone line is an extension, a number among a plurality of preset outside line transmission number candidates is transmitted to the connected telephone line by a DTMF tone signal or a pulse signal, A fourth step of determining whether the connected telephone line is a tone line or a pulse line by detecting the presence or absence of a dial tone from the telephone line, and a case where no dial tone is detected in the fourth step. After confirming the dial tone of the closed telephone line, a DTMF tone signal or a pulse signal of a next number among the plurality of outside line candidate numbers is transmitted to the connected telephone line, and Detecting the presence or absence of a dial tone is repeated until a dial tone from the connected telephone line is detected.
A fifth step of determining a number transmitted by a TMF tone signal or a pulse signal as an outside line transmission number.

According to a third aspect of the present invention, there is provided a first procedure for connecting a data communication device to a telephone line, and whether the telephone line is an internal line or an external line by a dial tone from the telephone line connected in the first step. A second procedure for determining whether there is a telephone line, and in the second procedure, when it is determined that the connected telephone line is an outside line, a predetermined DTMF tone signal or pulse signal is transmitted to the connected telephone line; A third step of determining whether the connected telephone line is a tone line or a pulse line by detecting the presence or absence of a dial tone from the telephone line; and When it is determined that the telephone number is an extension, a number among a plurality of candidates for the outside line number set in advance is transmitted to the connected telephone line by a DTMF tone signal or a pulse signal,
A fourth step of determining whether the connected telephone line is a tone line or a pulse line by detecting the presence or absence of a dial tone from the telephone line, and a case where no dial tone is detected in the fourth step. After confirming the dial tone of the closed telephone line, a DTMF tone signal or pulse signal of the next number among the plurality of outside line candidate numbers is transmitted to the connected telephone line, and Detecting the presence or absence of a dial tone is repeatedly performed until a dial tone from the connected telephone line is detected, and if a dial tone is detected, the number transmitted by a DTMF tone signal or pulse signal immediately before that is detected. Fig. 14 is a computer-readable recording medium on which a program for causing a computer to execute a fifth procedure of determining a calling number is recorded.

According to a fourth aspect of the present invention, there is provided a semiconductor device for performing data communication by being connected to a telephone line by a line closing means, wherein the line closing means connects to the telephone line.
A function, a second function of determining whether the telephone line is an extension or an outside line based on a dial tone from the telephone line connected by the first function, and the second function by the second function. Is determined to be an outside line, a predetermined DTMF tone signal or pulse signal is transmitted to the connected telephone line, and by detecting the presence or absence of a dial tone from the telephone line, the connected telephone line is connected to the tone line. A third function of determining whether the telephone line is an extension or a pulse line. If the second function determines that the connected telephone line is an extension, a plurality of preset outside line transmission number candidates are set. Is transmitted to the connected telephone line as a DTMF tone signal or a pulse signal, and the presence or absence of a dial tone from the telephone line is detected to determine whether the connected telephone line is a tone line or not. A fourth function of determining whether it is,
In this fourth function, if a dial tone is not detected, after confirming the dial tone of the closed telephone line, the DTMF tone signal or the pulse signal of the next number among the plurality of outside line candidate numbers is connected. The transmission to the telephone line and the detection of the presence or absence of a dial tone from the telephone line are repeated until the dial tone from the connected telephone line is detected. A fifth function of determining a number transmitted by a tone signal or a pulse signal as an outside line transmission number.

According to a fifth aspect of the present invention, there is provided a line identification method for detecting a type of a telephone line to which a data communication device is connected, wherein line closing means for dialing by connecting the data communication device to a telephone line. By connecting the data communication device to a telephone line, detecting the characteristics of the dial tone from the connected telephone line, and determining from the result whether the connected telephone line is an internal line or an external line, If the connected telephone line is an outside line, a predetermined DTMF tone signal or pulse signal is transmitted to the connected telephone line, and the presence or absence of a dial tone from the telephone line is detected, whereby the connected telephone line becomes a tone line. Whether it is a pulse line or not, if the connected telephone line is an extension,
Sending out a number among a plurality of preset outside line calling number candidates to the connected telephone line with a DTMF tone signal;
If the presence or absence of a dial tone from the telephone line is not detected and the dial tone is not detected, the dial tone of the next number in the plurality of outside line candidate numbers is checked after confirming the dial tone of the telephone line. Sending to the connected telephone line and detecting the presence or absence of a dial tone from the telephone line are repeated until a dial tone from the connected telephone line is detected. It is determined that the number transmitted by the DTMF tone signal is an outside line calling number, and if a dial tone is not detected in all candidate numbers of the plurality of outside line calling numbers, a plurality of outside lines preset by pulse dialing are set again. Dialing to the connected telephone line using a calling number and repeatedly detecting the presence or absence of a dial tone from the connected telephone line are repeated to determine whether the connected telephone line is internal or external. Another emission line or pulse line, and detecting a dialing prefix.

According to a sixth aspect of the present invention, there is provided a data communication apparatus for performing data communication by connecting to a telephone line.
Selection signal generating means for generating a tone signal and a pulse signal, line closing means for connecting the data communication device to a telephone line, and connecting the data communication device to the telephone line with the line closing means. The characteristics of the dial tone from the telephone line are detected, and from the result, it is determined whether the connected telephone line is an internal line or an external line. If the connected telephone line is an external line, a predetermined DTMF tone signal or A pulse signal is transmitted to the connected telephone line, and it is determined whether the connected telephone line is a tone line or a pulse line by detecting the presence or absence of a dial tone from the telephone line. If the line is an extension, the number among the plurality of preset outside line candidates is DT
An MF tone signal is sent to the connected telephone line, and if a dial tone is not detected by detecting the presence or absence of a dial tone from the telephone line, after confirming the dial tone of the telephone line, the plurality of outside line dial numbers are checked. Transmitting the DTMF tone signal of the next number in the candidate to the connected telephone line and detecting the presence or absence of a dial tone from the telephone line means that the dial tone from the connected telephone line is detected. Repeatedly, if a dial tone is detected, the number transmitted by the DTMF tone signal immediately before that is determined to be an outside line dial number, and if no dial tone is detected by all candidate numbers of the plurality of external line dial numbers,
Repeating the dialing to the connected telephone line using a plurality of preset outside line calling numbers by pulse dialing, and detecting the presence or absence of a dial tone from the connected telephone line, repeats the connection. Line type detecting means for detecting whether the telephone line is an extension or an outside line, whether it is a tone line or a pulse line, and an outside line transmission number.

According to a seventh aspect of the present invention, in the data communication apparatus according to the sixth aspect, the line type detecting means can output a detection result to the outside.

According to an eighth aspect of the present invention, in the data communication apparatus according to the sixth aspect, the line type detecting means can store a detection result therein.

According to the ninth aspect of the present invention, there is provided means for presetting line parameters including an extension or an outside line, an outside line originating number in the case of an extension, a tone line or a pulse line before the dialing operation, and The dialing operation is performed according to the line parameters.

According to a tenth aspect of the present invention, in the data communication apparatus according to the ninth aspect, the dialing operation is stopped when a preset line parameter is different from a line parameter of an actually connected telephone line. Outputs that the setting of the line parameter is incorrect.

According to an eleventh aspect of the present invention, in a data communication apparatus connected to a telephone line by a line closing means for performing data communication, a detecting means for detecting a line voltage of the telephone line, Determining means for determining whether or not the telephone line is connected from the result, before dialing, determine whether or not the detecting means and the determining means are connected to the telephone line, and determine whether or not the telephone line is connected. If it is not connected, it outputs the determination result.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is a data communication apparatus for performing data communication by connecting to a telephone line, and determining whether or not there is a dial tone from the connected telephone line and a tone in which the dial tone is continuous. A function to determine whether the signal is an intermittent tone having an on-time and an off-time, and a DTMF
(Dual Tone Multi Frequency) It has a dialing means for performing dialing with a tone signal (PB (push button) signal) and a pulse signal.

In this embodiment, after the off-hook (the telephone line is closed), whether the dial tone from the connected telephone line is any of a continuous tone signal, an intermittent tone having an on-time and an off-time, Is determined by the determination means,
It detects whether the dial tone from the telephone line is a continuous tone from the public line or an intermittent tone from the extension, or whether the dial tone is not detected because the telephone line is not connected.

In the present embodiment, when it is determined that the connected telephone line is an outside line, an arbitrary number is dialed first with a DTMF tone signal, and then the presence or absence of a dial tone from the telephone line is determined. Is lost, it is determined that the dialing method is suitable for the connected telephone line, and if there is a dial tone, it is determined that the dialing method is not suitable for the connected telephone line. Then, a dialing method suitable for the telephone line is determined.

In the present embodiment, when a dial tone from a telephone line is determined to be a dial tone from an extension, one of a plurality of candidate numbers determined in advance as an external line dial number is assigned to the DTM.
It is generated by an F tone signal, and thereafter, it is detected whether or not there is a continuous dial tone from the telephone line. If there is a continuous dial tone, it is assumed that the current dialing method and the outside line dial number can be detected.

In this embodiment, if there is no continuous dial tone, the telephone line is once opened, the telephone line is closed again, and the next candidate number predetermined by the DTMF tone signal is dialed. The same operation is performed with all candidate numbers until a continuous dial tone from the telephone line is detected. In the present embodiment, if a continuous dial tone from the telephone line cannot be detected in all the candidate numbers, the same operation is performed from the first candidate number in the pulse signal,
The detection result is notified to the host that controls this embodiment.

In this embodiment having such a dialing means, the host performs the dialing based on the parameters of the telephone line so that the host can set the detection result as the parameter of the telephone line before the dialing operation. The dialing can be performed normally just by placing the dial.

Further, another embodiment of the present invention has a detecting means for detecting the connection state of the telephone line by detecting the presence or absence of the line voltage of the telephone line, and the modem side detects the detection result of the detecting means by the modem side. Monitor and check the detection result of the detection means before performing the dialing operation, and send a message to the host that there is no connection to the telephone line such as a "NO LINE" command if there is no line voltage on the telephone line. .

As described above, according to the embodiment of the present invention, the type of the connected telephone line, the outside line calling number, and the like can be automatically detected, and the normal dialing operation can be performed without troublesome setting. be able to. Also, the connection state of the telephone line can be detected before dialing, and information indicating the accurate connection state of the telephone line can be output.

Next, the present embodiment using a modem as an example of a dialing device connected to a public line will be specifically described. FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a modem chip formed of a semiconductor element as a modem. Inside the modem chip, a digital signal processor (DSP) core (which may have a CPU core) 11, a ROM 12, a RAM 13,
AFE (A / D, D / A conversion unit) 14, 2-wire to 4-wire conversion circuit 15, I / O 16 for communication, I for NCU control
/ O17. The modem 1 communicates with a host such as a personal computer or a microcomputer via a communication I / O (serial communication I / O or parallel communication I / O).
O) It is connected by 16 and is controlled by a command usually called an AT command. The AT command has a form in which the first character of the command starts with AT or at, followed by the command.

Reference numeral 2 denotes a transformer, and reference numeral 3 denotes a relay contact for opening and closing a telephone line. The relay contact 3 constitutes a circuit closing circuit for opening and closing the telephone line. The transformer 2 is a wet transformer through which current can flow when the telephone line is closed. Reference numeral 4 denotes a ring detection circuit as voltage / ring signal detection means for detecting a line voltage of the telephone line and a ring signal from the telephone line, and 5 denotes a resistor.

To detect the type of telephone line, the host issues an "AT + L?" Command (this command is an example and does not define a command) to the modem 1 and issues a line type. The detection operation is instructed to the modem 1. The modem 1 turns on the relay contact 3 and goes off-hook (closes the telephone line) in order to detect the line type according to the command. If the telephone line connected to the modem 1 is a public line, a dial tone is output from the telephone line.
I come to. The dial tone from the public line is a continuous tone as shown in FIG. When the modem 1 is connected to an extension, a dial tone from the extension comes to the modem 1.
The dial tone from the extension is an intermittent tone in which the on-time and the off-time of the tone as shown in FIG. 5 alternate. Modem 1
Determines that the telephone line is an extension when this intermittent tone is detected.

FIGS. 2 to 4 show the modem 1 according to this embodiment.
2 shows a flowchart of a processing procedure of the DSP 11 in the inside. D
The SP 11 executes the processing procedures shown in FIGS. 2 to 4 based on a program such as a telephone line connection program stored in the ROM 12 as a recording medium. DSP11
Turns on the relay contact 3 via the NCU I / O 17 to make it off-hook as shown in FIG.
01), a dial tone (tone signal) from the telephone line is A / D-converted by the AFE 14 via the relay contact 3, the transformer 2, the 2-wire to 4-wire conversion circuit 15 and input, and the dial tone is detected. (Step 102), a dialing operation is performed. In this case, the DSP 11 performs signal processing on digital data obtained by A / D converting the tone signal from the telephone line by the AFE 14, analyzes the digital data, and extracts a frequency component in a specific range to detect a dial tone.

Next, the DSP 11 determines whether the dial tone from the telephone line is a dial tone from a public line or a dial tone from an extension (steps 103 and 104). In this case, the DSP 11 measures the lengths of the on-time and the off-time of the tone signal from the telephone line, and if these are within a preset time range, the DSP 11 emits a dial tone from the telephone line. Recognizes a dial tone from an extension and recognizes a dial tone from a telephone line as a dial tone from a public line (outside line) if there is no off time of the tone signal and only the on time is longer than a preset time. I do.

Therefore, after going off-hook, the DSP 11 analyzes the tone signal from the telephone line and recognizes whether the dial tone from the telephone line is a dial tone from a public telephone line or a dial tone from an extension. can do. Since the intermittent tone from the extension may change depending on the automatic exchange PBX, the DSP 11 may determine the intermittent tone other than the busy tone, which is the intermittent tone from the telephone line, as the tone from the extension. If no tone signal is detected from the telephone line, the DSP 11 outputs a "NO DIALTONE" code to the host via the communication I / O 16 to notify that there is a problem with the telephone line (step 105). I for NCU
The relay contact 3 is turned on via / O17 to be off-hook (step 106).

When the DSP 11 recognizes that the dial tone from the telephone line is a dial tone from an outside line, the DSP 11 performs a public line detection process (step 108), and turns on the relay contact 3 via the NCU I / O 17. And off-hook (step 106). In the public line detection process, as shown in FIG. 3, the DSP 11 generates and dials a DTMF tone signal of the first digit (for example, “0”) of the number designated by the host in advance (step 111).
In this case, when generating the DTMF tone signal, the DSP 11 calculates a signal obtained by combining two different frequencies as digital data by a table or an operation, and outputs the digital data to the D / A converter of the AFE 14 to determine the signal in advance. Generated time. This signal is sent to the telephone line via the 2-wire to 4-wire conversion circuit 15, the transformer 2, and the relay contact 3.

After that, the DSP 11 switches from the telephone line to the relay contact 3, the transformer 2, the 2-wire to 4-wire conversion circuit 15, the AF
It is checked whether or not the tone signal input via E14 has disappeared (step 112). If the tone signal from the telephone line has disappeared, it is the result of the telephone network correctly recognizing the tone signal, and this diagram It determines that the ring system is correct, and outputs the detection result of the dial tone from the telephone line to the host (step 117).

If the dial tone is not lost, the DSP 11 dials again the first digit of the number specified by the host by a high-speed pulse dialing method (step 113). In the pulse dialing, the DSP 11 controls the relay contact 3 via the NCU I / O 17 to open the telephone line closed 20 or 10 times per second corresponding to the number of the dialing number. This dialing method has a line speed of 20 pps as described above.
(Pulse / second) Since there are two methods of 10 pps (pulse / second), the DSP 11 first dials at 20 pps (step 113), and from the telephone line, the relay contact 3, the transformer 2, the 2-wire- 4-wire conversion circuit 15, AF
The presence or absence of a dial tone (tone signal) input via E14 is checked (step 114). If the dial tone from the telephone line disappears, the detection result is output to the host (step 117).

If the dial tone from the telephone line is not lost, the DSP 11 dials the same number again in a pulse manner at 10 pps (step 115), and relays the relay contact 3, the transformer 2, the 2-wire-4 from the telephone line. Line conversion circuit 15, A
The presence or absence of a dial tone (tone signal) input via the FE 14 is checked (step 116), and if the dial tone from the telephone line disappears, the detection result is output to the host (step 117). If there is a tone from the telephone line, the DSP 11 outputs a detection error to the host via the communication I / O 16 because there is a possibility that the telephone line is abnormal (step 118). In this embodiment, the DTMF tone signal is generated first. However, the dialing may be performed first by the pulse method and then by the DTMF tone signal.

When the DSP 11 recognizes that the dial tone from the telephone line after the off-hook is a dial tone from the extension as shown in FIG. 2, the DSP 11 performs extension detection processing (step 10).
7), the relay contact 3 is turned on via the NCU I / O 17 to be off-hook (step 106). DSP1
In the extension detection process, as shown in FIG. 4, one dials one of a plurality of numbers set in advance as candidates for the outside line transmission number using the DTMF tone method (steps 121 to 123). Thereafter, the DSP 11 checks a dial tone (tone signal) input from the telephone line via the relay contact 3, the transformer 2, the 2-wire to 4-wire conversion circuit 15, and the AFE 14 (step 124), and makes a call from the public line. If a sound (continuous dial tone) is detected, the outside line dial number and the dialing method are recognized as correct, and the detection result is output to the host (step 129).

When the DSP 11 does not detect a dial tone from a public line, the DSP 11 detects a dial tone from an external line by dialing the external dial number for all of a plurality of numbers preset as candidates for the external line number. (Step 1
23, 124) is completed (step 125), and detection of a dial tone from an outside line by dialing the outside line number for all of a plurality of numbers that are set in advance as candidates for the outside line number. (Step 123,
124), the outside line calling number is changed to the next number among a plurality of numbers set in advance as candidates for the outside line calling number (step 126), and once the PBX disconnects the telephone line. When the relay contact 3 is turned off via the I / O 17 for NCU control during a time when it is possible to recognize the
27) Then, the relay contact 3 is turned on again via the NCU control I / O 17 to turn off the hook (close the line) (step 128), and return to step 123.

Also, the DSP 11 has completed the detection of the dial tone from the outside line by dialing the outside line number (steps 123 and 124) for all of the plurality of numbers that are set in advance as candidates for the outside line number. In this case, for all of the plurality of numbers that have been set in advance as candidates for the outside line transmission number for all dialing methods, detection of a dial tone from the outside line by dialing the outside line transmission number (steps 123 to 128). It is determined whether or not the calling is completed (step 130), and for all dialing methods, detection of a dial tone from an outside line by dialing the outside line transmission number for all of a plurality of numbers set in advance as candidates for the outside line transmission number. (Steps 123-1
If the execution of step 28) has not been completed, the flow returns to step 122 to select a number that has not been dialed yet from among a plurality of numbers that have been set in advance as candidates for the outside line transmission number. Check the dial tone from the telephone line by dialing using the ring method.

The DSP 11 performs such an operation until a dial tone from the telephone line is detected or until dialing is completed for all candidates for the outside line transmission number. DSP11
Changes the dialing system to the 20 pps pulse dialing system if no dial tone from the telephone line is detected in this series of operations (step 131). Then DS
P11 performs the same operation as described above in the public line detection processing (step 1108), and checks the dial tone from the telephone line. DSP11 uses this dialing method.
The same operation as described above is performed until a dial tone is detected or dialing of all outside line candidate numbers is completed.

If the DSP 11 does not detect a dial tone from the telephone line in a series of operations, the DSP 11 changes the dialing system to a pulse dial system of 10 pps (step 131). Thereafter, the DSP 11 performs the same operation as described above in the public line detection processing (step 108), and checks the dial tone from the telephone line. If the DSP 11 does not detect the dial tone from the public line even in this series of operations, the DSP 11 determines that there is no correct number among the preset outside line numbers and determines that it is a detection error, and communicates a predetermined error code. The data is output to the host via the I / O 16 (step 132). This error code is, for example, "PB
XERR "code. When the detection error is input from the DSP 11, the host sets another outside line transmission number candidate to the DSP 11 via the communication I / O 16, and causes the telephone line type to be detected again.

If the DSP 11 detects a dial tone from the public line (if the dial tone from the public line disappears), the DSP 11 determines the dialing number and the dialing method at that time to be an external line dial number suitable for the public line. , It is determined that the dialing method is detected, and the detection result is used as the communication I / O.
Output to the host via O16 (step 117).
As an example, whether an extension is an outside line or an outside line (0: outside line, 1: inside line), dialing method (0: tone, 1:20 pps pulse, 2:10 pps pulse), outside line transmission number (0 to 9)
Then, the detection result is output as “100” in the case of the extension, the tone dialing method, and the outside line transmission number 0.
When a detection error occurs, the DSP 11 outputs a numerical value indicating a predetermined error. DSP1
1 has a non-volatile memory, it is also possible to store the line identification detection results (telephone line type, dialing system, detection result of outside line transmission number) in the non-volatile memory as internal parameters. is there. If the internal parameters are stored in the non-volatile memory, the modem 1 can perform a correct dialing operation by the internal parameters stored in the non-volatile memory even after a reset or power-off unless the connected telephone line is changed. It becomes possible.

The host stores the line type detection result in the nonvolatile memory based on the result of the line type detection from the DSP 11.
When the host is operated after resetting the modem 1, the line parameters (telephone line type, dialing method, outside line transmission number) are used by using the numerical value of the line type detection result.
Is set to the modem 1, and the parameters of the telephone line are set by, for example, an "AT + L = 100" code or the like. Next, the host dials the desired number using the "ATD" command. In order to dial the number 123456, the host issues a command of “ATD123456” to the DSP 11 and instructs the DSP 11 to dial.

According to the line parameters set by the host, the DSP 11 in the modem 1 first sets the NCU I / O
The relay contact 3 is turned on via O17 to go off-hook, and if an internal dial tone is detected in order to expect a dial tone from the internal line, the external line number 0 is dialed by a tone dialing method, and the telephone line is connected to the public. After detecting the dial tone of the line, dial the number "123456" in a tone system. If the DSP 11 detects a dial tone of an external line from the telephone line instead of the dial tone of the internal line after the first off-hook, the DSP 11 determines that the connected telephone line has been changed, and stops dialing. "WRONG L
A code "INE" is output to the host via the communication I / O 16 to notify the host that the line parameters are different. The host causes the modem 1 to perform the line type detection operation again from the result, obtains the correct line parameters from the modem 1, sets the line parameters in the modem 1, and performs the dialing operation again.

As described above, according to this embodiment, the distinction between the public line (external line) / extension and the tone line / external line
Pulse lines can be distinguished and the line parameters of the outside line calling number can be automatically and easily detected without depending on the user.The host that controls the dialing operation always sets the line parameters in advance, so that the same dial command is always used. The dial operation suitable for the telephone line can be easily performed by using. For this reason, the user can be released from the task of manually setting the parameters (line parameters) of the telephone line type. Also,
Even if the telephone line connected to the modem is changed, the modem reports the change to the host, so that the host can easily know the telephone line change and change the line parameters.

Further, by storing the set line parameters in the memory of the modem, from the next telephone line connection, the host side only needs to send a command in which the connection start command and the individual number are combined to the modem. Connection is possible. Note that part of the above processing of the host can be performed by the DSP 11 using a program in the ROM 12 of the modem 1.

FIG. 6 shows the configuration of a ring detection circuit according to another embodiment of the present invention. This embodiment is different from the above embodiment in that a ring detection circuit 4 as a voltage / ring signal detection means for detecting a line voltage of a telephone line and a ring signal from the telephone line has a configuration as shown in FIG. A ring detection circuit is used. Relay RL1 is connected to contact P
1, the connection between P3 and the connection between the contacts P2 and P3 can be selected, and the connection between the contacts P4 and P6 and the connection between the contacts P5 and P6 can be selected. The connection and the connection between the contacts P4 and P6 are selected.

Zener diodes ZD1 and ZD2 determine the operating threshold voltage of the ring detection circuit.
It is a Zener diode of 0 to 30V. The time during which the transient response current flows is determined by the values of the resistor R1 and the capacitor C1. The photocoupler OP1 converts a transient current into a digital signal, and outputs a pulse signal of a time determined by the values of the resistor R1 and the capacitor C1 as an output signal.

A ring signal (20 Hz, 75
Vrms AC signal), this ring signal is input to the photocoupler OP1 via the contacts P1 and P3, between the contacts P4 and P6, the Zener diodes ZD1 and ZD2, the resistor R1 and the capacitor C1, and from the photocoupler OP1. When the ring signal rises and falls, a pulse signal having a frequency twice as high as the frequency of the ring signal is output as a ring detection signal.

If the telephone line is normally connected, a voltage of DC 48 V is normally applied between the lines L1 and L2 of the telephone line. To check for telephone line voltage,
The relay control signal to the relay RL1 is controlled to turn on the relay RL1. Thereby, the relay RL1 selects the connection between the contacts P2 and P3 and the connection between the contacts P5 and P6, and the voltage applied to the photocoupler OP1 via the Zener diodes ZD1, ZD2, the resistor R1, and the capacitor C1 is inverted. As a result, a pulse signal is output from the photocoupler OP1. If the telephone line is not connected, since no voltage is applied between the lines L1 and L2 of the telephone line, no pulse signal is output from the photocoupler OP1 even when the relay RL1 is turned on.

Note that this ring detection circuit is an example of voltage detection means, and a simple voltage detection circuit using a comparator or an A / D converter may be used instead of the ring signal detection. FIG. 7 shows a connection detection flow of the telephone line. The DSP 11 executes a telephone line connection detection flow shown in FIG. 7 based on a program stored in the ROM 12. That is, before dialing, the DSP 11 turns on the relay RL1 via the NCU control I / O 17 (step 141), and outputs the pulse signal input from the photocoupler OP1 via the NCU control I / O 17. By checking the presence or absence, it is determined whether or not a pulse signal is output from the photocoupler OP1 within a predetermined time (specified time) (step 142).

If no pulse signal is output from the photocoupler OP1 within the specified time, the DSP 11 determines that the modem 1 is not connected to the telephone line, and sends an error message to the host via the NCU control I / O 17 as " An error is notified by outputting a "NO LINE" code, and the dialing operation is stopped (step 143).
The host can see that the modem 1 is not connected to the telephone line by looking at the error message from the DSP 11. After that, the DSP 11 turns off the relay RL1 via the NCU control I / O 17 (step 144).

According to this embodiment, the connection of the telephone line can be confirmed with a simple configuration before dialing, and an error message can be issued if the telephone line is not connected. The load can be reduced without requiring any hardware resources or software for checking the connection of the telephone line on the host side.

[0060]

As described above, according to the first to ninth aspects of the present invention, the type of the connected telephone line can be automatically detected, and the line parameter setting is automatically set without depending on the user. This allows normal dialing according to the connected telephone line. According to the tenth aspect, even when the connected telephone line is changed, the line parameters can be automatically changed. According to the eleventh aspect, the connection of the telephone line can be confirmed with a simple configuration before dialing.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a processing procedure of a DSP according to the embodiment.

FIG. 3 is a flowchart showing in detail a public line detection processing procedure of the processing procedure.

FIG. 4 is a flowchart showing in detail an extension detection processing procedure of the processing procedure.

FIG. 5 is a diagram showing a dial tone of a public line and a dial tone of an extension.

FIG. 6 is a circuit diagram illustrating a configuration of a ring detection circuit according to another embodiment of the present invention.

FIG. 7 is a flowchart showing a telephone line connection detection flow of the DSP in the embodiment.

[Explanation of symbols]

 Reference Signs List 1 modem 2 transformer 3 relay contact 11 DSP 12 ROM 13 RAM 14 AFE 15 2-wire to 4-wire conversion circuit 16 communication I / O 17 NCU control I / O RL1 relays P1 to P6 contacts ZD1, ZD2 Zener diode R1 resistance C1 Capacitor OP1 Photocoupler

Claims (11)

[Claims] 1. A telephone line connection method for connecting a data communication device to a telephone line, comprising: a first step of connecting the data communication device to a telephone line; and a call originating from the telephone line connected in the first step. A second step of determining whether the telephone line is an internal line or an external line by sound;
In the step, when it is determined that the connected telephone line is an outside line, transmitting a predetermined DTMF tone signal or pulse signal to the connected telephone line, and detecting the presence or absence of a dial tone from the telephone line. A third step of determining whether the connected telephone line is a tone line or a pulse line, and a predetermined setting when the connected telephone line is determined to be an extension in the second step. A number out of a plurality of candidates for outside line transmission numbers is transmitted to the connected telephone line by a DTMF tone signal or a pulse signal, and the presence or absence of a dial tone from the telephone line is detected, whereby the connected telephone line becomes a tone line. And a pulse line. If no dial tone is detected in the fourth step, check the dial tone of the closed telephone line. Sending a DTMF tone signal or pulse signal of the next number among the plurality of outside line candidate numbers to the connected telephone line to detect the presence or absence of a dial tone from the telephone line. A fifth step of repeating until a dial tone from the connected telephone line is detected, and determining a number transmitted by a DTMF tone signal or a pulse signal immediately before the dial tone is detected as an outside line dial number when the dial tone is detected. A telephone line connection method. 2. A telephone line connection program for connecting a data communication device to a telephone line, comprising: a first procedure for connecting the data communication device to a telephone line; and a telephone line connected by the first procedure. A second procedure for determining whether the telephone line is an internal line or an external line based on a dial tone from
In the second procedure, when it is determined that the connected telephone line is an outside line, a predetermined DTMF tone signal or pulse signal is transmitted to the connected telephone line, and it is determined whether there is a dial tone from the telephone line. A third procedure of detecting whether the connected telephone line is a tone line or a pulse line by detecting, and in the second procedure, when it is determined that the connected telephone line is an extension, A number out of a plurality of candidates for a set outside line transmission number is transmitted to the connected telephone line by a DTMF tone signal or a pulse signal, and the presence or absence of a dial tone from the telephone line is detected to detect the connected telephone line. Is a tone line or a pulse line, and in this fourth step,
If the dial tone is not detected, after confirming the dial tone of the closed telephone line, the DTMF tone signal or the pulse signal of the next number among the plurality of outside line candidates is transmitted to the connected telephone line. Detecting the presence or absence of a dial tone from the telephone line is repeatedly performed until a dial tone from the connected telephone line is detected, and if a dial tone is detected, a DTMF tone signal or pulse signal is detected immediately before the dial tone is detected. And a fifth step of judging the number transmitted in step (c) as an outside line transmission number. 3. A first procedure for connecting a data communication device to a telephone line, and a second step of determining whether the telephone line is an internal line or an external line based on a dial tone from the telephone line connected in the first step. If it is determined in the second procedure and the second procedure that the connected telephone line is an outside line, a predetermined DT
Transmitting an MF tone signal or a pulse signal to the connected telephone line, and detecting whether there is a dial tone from the telephone line to determine whether the connected telephone line is a tone line or a pulse line. 3 procedures and the second
In the procedure, when it is determined that the connected telephone line is an extension, a number among a plurality of preset outside line transmission number candidates is transmitted to the connected telephone line by a DTMF tone signal or a pulse signal, A fourth step of determining whether the connected telephone line is a tone line or a pulse line by detecting the presence or absence of a dial tone from the telephone line, and a case where no dial tone is detected in the fourth step. After confirming the dial tone of the closed telephone line, a DTMF tone signal or pulse signal of the next number among the plurality of outside line candidate numbers is transmitted to the connected telephone line, and Detecting the presence or absence of a dial tone is repeated until a dial tone from the connected telephone line is detected.
A computer-readable recording medium recording a program for causing a computer to execute a fifth procedure of determining a number transmitted by a TMF tone signal or a pulse signal as an outside line transmission number. 4. A semiconductor device connected to a telephone line by a line closing means for performing data communication, wherein said first function causes said line closing means to connect to a telephone line, and is connected by said first function. A second function of determining whether the telephone line is an internal line or an external line based on a dial tone from the telephone line; and a predetermined function when the connected telephone line is determined to be an external line by the second function. DTMF tone signal or pulse signal is transmitted to the connected telephone line, and the presence or absence of a dial tone from the telephone line is detected to determine whether the connected telephone line is a tone line or a pulse line. In the third function and the second function, when it is determined that the connected telephone line is an extension, a number among a plurality of preset outside line transmission number candidates is set to a DTMF tone signal or a pulse signal. A fourth function of transmitting to the connected telephone line and detecting whether there is a dial tone from the telephone line to determine whether the connected telephone line is a tone line or a pulse line; If the dial tone is not detected by the function, after confirming the dial tone of the closed telephone line, the DTMF tone signal or the pulse signal of the next number among the plurality of outside line candidate numbers is transmitted to the connected telephone line. Sending out and detecting the presence or absence of a dial tone from the telephone line is repeated until a dial tone from the connected telephone line is detected, and if a dial tone is detected, a DTMF tone signal or A semiconductor element having a fifth function of determining a number transmitted by a pulse signal as an outside line transmission number. 5. A line identification method for detecting a type of a telephone line to which a data communication device is connected, wherein said data communication device is connected to a telephone line by line closing means for dialing. Connect to the phone line,
The characteristics of the dial tone from the connected telephone line are detected, and from the result, it is determined whether the connected telephone line is an internal line or an external line. If the connected telephone line is an external line, a predetermined DTMF is determined. Sending a tone signal or a pulse signal to the connected telephone line, and determining whether the connected telephone line is a tone line or a pulse line by detecting the presence or absence of a dial tone from the telephone line, If the connected telephone line is an extension, a number among a plurality of preset outside line transmission number candidates is transmitted to the connected telephone line by a DTMF tone signal, and the presence or absence of a dial tone from the telephone line is detected. If no outgoing tone is detected, the DTMF tone signal of the next number among the plurality of outside line candidates is transmitted to the connected telephone line after confirming the outgoing tone of the telephone line. Detecting the presence or absence of a dial tone from a telephone line is repeated until a dial tone from the connected telephone line is detected, and if a dial tone is detected, the number transmitted by the DTMF tone signal immediately before that is detected. Judgment as an outside line calling number, if no dial tone is detected in all candidate numbers of the plurality of outside line calling numbers, the connection is established using a plurality of outside line calling numbers set again in advance by pulse dialing. Dialing the telephone line and repeatedly detecting the presence or absence of a dial tone from the connected telephone line to determine whether the connected telephone line is an internal line or an external line, a tone line or a pulse line, and an external line calling number. A line type detection method characterized by detecting. 6. A data communication apparatus for performing data communication by connecting to a telephone line, a selection signal generating means for generating a DTMF tone signal and a pulse signal, and a line closing means for connecting the data communication apparatus to a telephone line. Connecting the data communication device to a telephone line by the line closing means, detecting characteristics of a dial tone from the connected telephone line, and determining from the result whether the connected telephone line is an internal line or an external line. If the connected telephone line is an outside line, a predetermined DTMF tone signal or pulse signal is transmitted to the connected telephone line, and the connection is established by detecting the presence or absence of a dial tone from the telephone line. It is determined whether the telephone line is a tone line or a pulse line, and if the connected telephone line is an extension, a plurality of preset outside line numbers are set. A number is transmitted to the connected telephone line as a DTMF tone signal, and if a dial tone is detected by detecting the presence or absence of a dial tone from the telephone line, the dial tone of the telephone line is confirmed, and then the plurality of outgoing calls are made. Sending the DTMF tone signal of the next number among the number candidates to the connected telephone line and detecting the presence or absence of a dial tone from the telephone line means that the dial tone from the connected telephone line is detected. When a dial tone is detected, the number transmitted by the DTMF tone signal immediately before that is determined as an outside line dial number, and a dial tone must be detected from all candidate numbers of the plurality of external line dial numbers. For example, dialing is performed to the connected telephone line again using a plurality of preset outside line calling numbers by pulse dialing, and the presence or absence of a dial tone from the connected telephone line is detected. Repeat the door,
A data communication device comprising: a line type detecting means for detecting whether the connected telephone line is an extension or an outside line, a tone line or a pulse line, and an outside line transmission number. 7. The data communication device according to claim 6, wherein
A data communication device, wherein the line type detection means can output a detection result to the outside. 8. The data communication device according to claim 6, wherein
A data communication device, wherein the line type detection means can store a detection result therein. 9. A means for presetting a line parameter including an extension or an outside line, an outside line originating number in the case of an extension, a tone line or a pulse line before a dialing operation, and dialing according to the set line parameter. A data communication device performing a ring operation. 10. The data communication apparatus according to claim 9, wherein the dialing operation is stopped when the preset line parameters are different from the line parameters of the actually connected telephone line, and the setting of the line parameters is incorrect. A data communication device for outputting a message indicating that the data communication has been performed. 11. A data communication apparatus connected to a telephone line by a line closing means for performing data communication, comprising: detecting means for detecting a line voltage of the telephone line; Determination means for determining whether or not the telephone line is connected, and before dialing, the detection means and the determination means determine whether or not the telephone line is connected, and determine if the telephone line is not connected. A data communication device for outputting a result.