JPH04354233A - Communication terminal equipment for subscriber telephone line - Google Patents

Abstract

PURPOSE:To enable the terminal equipment to easily recognize it when a transmission system of a line and that of a selection numeral signal are not in matching with each other. CONSTITUTION:The terminal equipment is provided with an incoming call detection circuit, a buzzer 31, a speech network circuit 32, a handset 33, a DP/PB generating circuit 34 and a CPU 35 similarly to the case with a conventional telephone set and in addition with a sounding tone detection circuit 24 and a display device 36. When the detection circuit 24 detects a call tone fed from a station after lapse of a prescribed time after a selection numeral signal (telephone number) by the rotary dial system or the pushbutton dial system selected by the switch of the DP/PB generating circuit 34, that is, no call tone nor a busy tone is detected, an LED of the display device 36 is blinked or a message such as 'inadequate line system' is displayed on an LCD. Thus, the operator selects a changeover switch to the correct position of the dial system.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal device connected to a subscriber telephone line.

0002

[Background of the Invention] Subscriber telephone lines to which communication terminal devices such as telephones and facsimile machines are connected include rotary dial lines (DP lines) and push button dial lines (PB lines).
There is. When using a communication terminal device connected to a rotary dial line, the DC power supply (-48V) supplied from the station is required.
) intermittently for each digit of the telephone number, a selected digit signal (the other party's telephone number) is sent to the line, which is detected by the exchange and the other party is called.

[0003] When connected to a push-button dial line, as shown in Figure 3, a selected number signal is sent to the line using a push-button dial method that assigns a high frequency and a low frequency to each number from 0 to 9. However, this is detected by the exchange and the other party is called.

[0004] The communication terminal device is configured to be able to send selected numeric signals using both methods, and by switching a changeover switch, it sends out selected numeric signals using a method that is compatible with the type of subscriber telephone line to which it is connected. This is generally how it is done.

FIG. 4A shows a signal transmission procedure when the line type and the selected digit transmission method are compatible. When the person is on the calling side, first, the DC circuit of a communication terminal device, such as a telephone, is closed by lifting the handset. This is detected and a dial tone is emitted from the central office exchange.
400Hz continuous) is transmitted.

[0006] After the communication terminal device detects the dial tone, a selection digit signal is sent out, which is detected by the exchange. Then, depending on the state of the other party, the exchange supplies a ring tone (ring back tone, 400 Hz modulation intermittent) or a busy tone (busy tone, 400 Hz intermittent), so the operator who hears this can You can decide how to respond.

FIG. 2B shows a signal transmission procedure when the line type and the selected number signal transmission method do not match. A dial tone is sent out from the exchange in the same procedure as in A of the same figure, and then a selection digit signal is sent out from the communication terminal device.

However, in this case, the exchange cannot detect the selected digit signal, so it continues to send out the dial tone and remains in a waiting state for the selected digit signal. Then, after a certain period of time has elapsed, the transmission of the dial tone is stopped and the waiting state for detecting the selected number signal is canceled.

[0009]

[Problems to be Solved by the Invention] Incidentally, in some of the above-mentioned communication terminal devices, the changeover switch for changing over the transmission method of the selected numeric signal is mounted so as to be exposed on the outside of the device in consideration of operability. . In such a device, the changeover switch may be switched, for example, when the device falls from the stand onto the floor.

[0010] Conventionally, however, the operator cannot easily recognize that the switch has been changed, so he dials the dial in that state, but only hears the dialing tone, so in some cases it may be determined that the device is malfunctioning. Something like this can happen. In this case, the communication terminal device may be sent for repair or left unused for a long period of time.

[0011] Therefore, the present invention solves the above-mentioned problem, and when the transmission method of the selected numeric signal does not match the type of subscriber telephone line to which it is connected, the operator can easily change it. This invention proposes a communication terminal device for a subscriber telephone line that can be recognized.

0012

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a communication terminal device that can be used by connecting to a rotary dial line or a push button dial line by changing a changeover switch.
A dial tone detection means detects a dial tone sent from an exchange, and when a dial tone is detected after a predetermined period of time has elapsed since the transmission of the selected digit signal, information indicating that the line and the transmission method of the selected digit signal do not match is provided. The present invention is characterized in that it includes means for outputting line mismatch information that occurs.

[0013]

[Operation] In the facsimile machine shown in FIG. 1, when a dial tone is detected by the dial tone detection circuit 24 after a predetermined period of time has elapsed since the DP signal generation circuit 20 or the PB signal generation circuit 22 sent out the selected numeric signal, the Control unit 19
A signal indicating this is supplied to the CPU 11. Then, the recording section 16 and the display section 17 operate under the control of the CPU 11, and the recording section 16 prints out a text such as "Line mismatch", and the display section 17 blinks the LED or displays the text on the LCD.

In the telephone set shown in FIG. 2, similarly to FIG. 1, after a predetermined period of time has elapsed since the DP/PB generation circuit 34 sends out the selected digit signal, the dial tone detection circuit 24 detects the dial tone supplied from the station. When detected, the LED of the display device 36 blinks under the control of the CPU 35, or a message such as "Line mismatch" is displayed on the LCD.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of a communication terminal device for subscriber telephone lines according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the configuration of a facsimile machine to which the present invention is applied. In the figure, 11 is a CPU that manages transmission and reception control, 12 is a ROM in which various control programs such as transmission and reception programs are stored, and 13 is a RAM in which image information to be transmitted and the like are stored.

The image information read by the image reading unit 14 is stored in the RAM 13 or sent directly to a modem and a network control circuit (NCU) that function as transmitting/receiving means.
15. Further, the image information inputted through the communication line is stored in the RAM 13 via the modem and the NCU 15, or is directly supplied to the recording section 16 which functions as a printer, and its contents are recorded.

[0018] The telephone number of the recipient is displayed on the display section 17.
This is displayed by being supplied with . The operation unit 18 provided in the facsimile machine is provided with a plurality of keys (not shown), and when these keys are operated, the contents are imported into the CPU 11.

In addition, when the selected number signal is sent out using the rotary dial method by setting a changeover switch (not shown), the DP signal generation circuit 20 is controlled by the communication control unit 19 to switch from the DC power supply supplied from the station to the DP signal generation circuit 20. performs an intermittent operation and sends a selected numeric signal to the line. A call signal supplied from the exchange is detected by an incoming call detection circuit 21, and a communication control section 19 controls each section based on this.

[0020] When the selector switch is changed and the selected number signal is sent out using the push-button/dial method,
Under the control of the communication control section 19, high frequency and low frequency waves corresponding to each digit of the telephone number are sent out from the PB signal generation circuit 22, and sent out to the telephone line via the transformer 23.

Reference numeral 24 denotes a tone detection circuit, which supplies a signal to the communication control section 19 when detecting a tone transmitted from the station. When the communication control section 19 receives a signal from the dial tone detection circuit 24 after a predetermined period of time has elapsed since sending out the selected number signal, it supplies the signal to the CPU 11 . and,
The CPU 11 controls the recording section 16 and the display section 17 to display line mismatch information indicating that the line and the transmission method of the selected numeric signal do not match.

The recording section 16 prints out a text such as "line mismatch", and the display section 17 displays the text by blinking an LED or using an LCD, for example. This allows the operator to easily recognize if the line and the transmission method of the selected numeric signal do not match, and therefore can switch the selector switch to the correct method.

FIG. 2 shows the configuration of a telephone 30 to which the present invention is applied. Reference numeral 21 designates an incoming call detection circuit similar to that shown in FIG. 1, which outputs a signal to the buzzer 31 when it detects a calling signal sent from the station, causing the buzzer 31 to sound. 3
2 is a speech network circuit, and handset 3
The voice signal from 3 is sent to the line, and the voice signal supplied from the line is supplied to the handset 33.

Reference numeral 34 denotes a DP/PB generation circuit, which sends out a selected number signal by a rotary dial method or a push button dial method by switching a changeover switch (not shown). Reference numeral 24 denotes a tone detection circuit similar to that shown in FIG. 1, which supplies a signal to the CPU 35 when it detects a tone supplied from the line.

When the CPU 35 receives a signal from the dial tone detection circuit 24 after a predetermined period of time has elapsed since the transmission of the selected number signal, it controls the display device 36 to determine whether the transmission method of the selected number signal matches the line. display line mismatch information indicating that there is no connection. The method for displaying line mismatch information is L.
There is a blinking ED and text display on the LCD.

[0026] In this telephone set 30 as well, if the connected subscriber telephone line and the selection digit signal transmission method do not match, the operator can immediately recognize this and can change the changeover switch to the correct side. can.

[0027]

Effects of the Invention As described above, when the type of subscriber telephone line connected and the transmission method of the selected numeric signal do not match, the line mismatch information indicating this is displayed on the LED or L
It can be displayed on a CD or printed out.

Therefore, according to the present invention, even if the changeover switch for changing over the transmission method of the selection number signal has been switched to another system, the operator can easily recognize this, so that he cannot change the changeover switch. This has the effect of being able to switch to the correct method.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a communication terminal device for a subscriber telephone line according to the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of a communication terminal device for a subscriber telephone line according to the present invention.

FIG. 3 is an explanatory diagram showing selection numeric signals of the push-button/dial system.

FIG. 4 is an explanatory diagram illustrating a signal sending procedure.

[Explanation of symbols]

10 Facsimile machine 11 CPU 12 ROM 13 RAM 16 Recording Department 17 Display section 19 Communication control section 20 DP signal generation circuit 21 Incoming call detection circuit 22 PB signal generation circuit 24 Tone detection circuit 30 Telephone 31 Buzzer 32 Speech network circuit 33 Handset 34 DP/PB generation circuit 35 CPU 36 Display device

Claims (1)

[Claims] Claim 1: A communication terminal device that can be used by connecting to a rotary dial line or a push button dial line by switching a changeover switch, comprising a dial tone detection means for detecting a dial tone sent from an exchange, and a selected numeric signal. and line mismatch information output means for generating information indicating that the transmission method of the selected numeric signal does not match the transmission method of the selected numeric signal when the dial tone is detected after a predetermined period of time has elapsed since the transmission of the selected numeric signal. Communication terminal equipment for subscriber telephone lines.