JPH07162549A - Network controller for communication terminal equipment or the like - Google Patents

Abstract

PURPOSE:To provide the network controller for a communication terminal equipment or the like by which transmission of an accurate dial pulse is disable due to an increased induced electromotive force of a transformer when a DS relay is opened and a current of a post pulse is met to standards. CONSTITUTION:This network controller for a terminal equipment or the like provided with an off-hook detection section 3 detecting polarity inversion or the like, a dial pulse transmission section 4 sending or closing a DC loop, an isolation transformer 5 making transmission reception of a signal to/from a line through electric isolation, a dial short-circuit relay 6 preventing an induced electromotive force in the transformer 5 at the transmission of the dial pulse, a call signal detection section 8 to detect a call signal from an exchange, and a line changeover relay for the selection between an externally mounted telephone set or the isolation transformer is provided with a waveform adjustment means 10 to adjust a waveform of the dial pulse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network control device such as a communication terminal device, and more particularly to a communication terminal device and the like in which distortion of a dial pulse waveform transmitted at the time of transmission (current transient characteristic after sending the dial pulse) is improved. The present invention relates to a network control device.

[0002]

2. Description of the Related Art The conventional dial pulse waveform in a general network control device has a waveform as shown in FIG.
In recent years, with the introduction of digital exchanges in various countries around the world, the portion a in the waveform shown in FIG. 3 has become a problem. The dial pulse is created by the dial pulse sending unit, and the operation of the dial pulse sending unit is schematically shown in FIG. In FIG. 2, L1 and L2 are lines,
DSR indicates a dial short relay (hereinafter, referred to as "DS relay") for preventing the induced electromotive force of the transformer at the time of sending the dial pulse, and SW is a switch for creating a dial pulse. The operation of the dial pulse transmitter having such a configuration is as follows. Normally, the switch SW is open (state of FIG. 2 (a))
However, when sending the dial pulse, first, the switch SW is closed and the DS relay is opened (state of FIG. 2B). This state corresponds to b in FIG. Next, the DS relay is closed (the state shown in FIG. 2C), and the switch SW is turned on / off the required number of times.
2 (state of FIG. 2D) and a pulse corresponding to c of FIG. 3 and a pulse (dial pulse) corresponding to d of FIG. 3 are generated. After the predetermined pulse number is generated, the switch SW is closed (state of FIG. 2E) and the DS relay is opened (state of FIG. 2F). The behavior at this time is the back electromotive force of FIG. 3a generated following the post pulse shown by e of FIG.

[0003]

When the back electromotive force (a in FIG. 3) is generated, it may be erroneously recognized as a Low signal, that is, a break time depending on the exchange. When such a situation occurs, accurate dial pulse transmission becomes impossible. As a conventional switch SW or DS relay of the dial pulse sending unit,
A photo coupler is used. An example of this is shown in FIG.
Then, as shown in FIG. 7, the waveform of the dial pulse shown in FIG. 3 (d in FIG. 3) is the CT of the photocoupler PC described above.
It changes depending on R (current transmissibility) and control current value, that is, current control resistance value R _X. Here, FIG. 7A shows the case where the current control resistance value R _X is small, and FIG. 7B shows the case where the current control resistance value R _X is large.

In the state shown in FIG. 7A, since the current control resistance value R _X is small, the portion a in the waveform shown in FIG. 3, that is, the induced electromotive force of the transformer when the DS relay is opened is large. If the current control resistance value R _X is increased in order to cause the above-mentioned problem and to prevent it, the current value of the post pulse becomes small as shown in FIG. 7 (b) f. There was a problem that it caused the problem of not conforming to the standard. The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above-mentioned problems in the related art and to increase the induced electromotive force of the transformer when the DS relay is opened, which is accurate. It is an object of the present invention to provide a network control device such as a communication terminal device capable of adapting the current value of a post pulse to a standard without causing a dial pulse transmission to become impossible. More specifically, the object of the present invention is to eliminate the portion a in the waveform shown in FIG. 3 and to eliminate the decrease in the current value of the post pulse shown in FIG. 7 (b) f. As shown in FIG. 11, there is provided a network control device such as a communication terminal device capable of transmitting a dial pulse having a regular dial pulse waveform.

[0005]

The above object of the present invention is to provide an off-hook detection section for detecting polarity reversal, a dial pulse transmission section for transmitting a dial pulse or closing a DC loop, and a line. An insulating transformer that electrically insulates signal transmission and reception, a dial short relay that prevents induced electromotive force of the transformer during dial pulse transmission, and a call signal detection unit for detecting a call signal from the exchange, In a network control device such as a communication terminal device having a line switching relay for switching between the external telephone side and the insulation transformer side, a waveform adjusting means for adjusting the waveform of the dial pulse is provided. This is achieved by a network control device such as a terminal device.

[0006]

In the network control device such as the communication terminal device according to the present invention, by providing the dial pulse waveform adjusting means as described above, the two types of waveform distortion of the dial pulse waveform described above are applied in the applicable area (country). ) It becomes possible to conform to the standard. Specifically, in the case of an applicable area (country) where accurate dial pulse transmission becomes impossible when the induced electromotive force of the transformer when the DS relay is opened becomes large, the above-mentioned current control resistance value R _X , And conversely, in the case of applicable areas (countries) where it is required to conform the post-pulse current value to the standard,
The current control resistance value R _X is selected from a plurality of preset values so as to reduce R _X. Further, in the network control device such as the communication terminal device according to the present invention, the photocoupler PC used for the switch SW and the DS relay of the dial pulse transmitting unit described above.
Since it is possible to absorb the characteristic variation of the above, there is a great secondary effect that the yield of the photocoupler PC used for the switch SW and the DS relay is significantly improved.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block configuration diagram of a communication terminal device according to an embodiment of the present invention. In the figure, symbol 1 is a telephone line, 2 is an external telephone, 3 is an off-hook detector for detecting polarity reversal, etc., 4 is a dial pulse, and DP (dial pulse) is a pulse for closing a DC loop. And 5 are insulation transformers for transmitting and receiving signals to and from the line in a DC-insulated state, and 6 is a DS for preventing induced electromotive force by the insulation transformer 5 during dial pulse transmission.
(Dial short) relay, 7 is a driver for driving the DP sending unit 4, DS relay 6, etc., 8 is a calling signal detecting unit for detecting a calling signal from the exchange, and 9 is the telephone 2 side and the insulating transformer 5. OH for switching between the side
A relay, 10 is a dial pulse waveform adjusting section which is a feature of the communication terminal apparatus according to the present embodiment, and these constitute a network control apparatus (a portion surrounded by a broken line).

Reference numerals 11 and thereafter show the components of the facsimile apparatus as the main system side of the communication terminal apparatus according to the present embodiment, and numeral 11 denotes a predetermined operation or LCD.
And the like, an operation display unit for displaying, a CPU for controlling the entire communication terminal apparatus, a RAM for forming a work area of the CPU 12, and a program for basing the operation of the CPU 12 and the like. A ROM, 15 is a communication control unit for controlling the above-mentioned network control device and various communication controls, and 16 is an encoding / encoding of image information according to a predetermined encoding method.
An encoding / decoding unit for decoding encoded image information, 1
7 is a modem for modulating a transmission signal and demodulating a reception signal, 1
8 is a scanner for reading image information, 19 is a CPU 1
2 is an interface circuit between the scanner 18 and 20, a plotter 20 for printing out received information, and 21 is an interface circuit between the CPU 12 and the plotter 20.

In the communication terminal device according to this embodiment,
The dial pulse waveform adjusting unit 10 in the network control device is
As the above-mentioned current control resistance value R _X , two resistance values R1 and R
It is configured such that either one of the two resistors 2 can be selected. FIG. 5 shows a specific configuration example in which either of the two resistance values R1 and R2 described above can be selected. Here, of the two resistances of the resistance values R1 and R2 in FIG. Either one is selected by setting a hard jumper (see FIG. 6) in one of the sockets 22a and 22b. According to the present embodiment, as the current control resistance value R _X described above, either of the two resistance values R1 and R2 can be selected, so that various standards of the applicable region (country) can be satisfied. It becomes possible to easily set the current control resistance value so that it can be adapted, and it is possible to adapt the two types of waveform distortion of the dial pulse waveform described above to the standards of the applicable region (country). can get.

FIG. 8 is a block diagram showing another example of the dial pulse waveform adjusting section 10 according to this embodiment. In FIG. 8, reference numeral 23 denotes a multiplexer that selects one of the two resistances R1 and R2 described above as the current control resistance according to the current control resistance selection signal from the system side. The same effect as the configuration example shown can be obtained. According to this embodiment, it is possible to obtain the same effect as that of the device shown in the above-mentioned embodiment. FIG. 9 is a flowchart according to the invention shown in claim 4 of the present invention. Here, by designating a French country code, the dial pulse waveform adjusting unit 10 as well as other parameters, It is set to select a current control resistor that satisfies the French dial pulse waveform standard.

That is, by entering the country code setting mode (step 31) and setting the French country code by a predetermined operation from the operation display section 11 (step 32), the dial pulse waveform adjusting section 10 also operates. It is set to automatically select a current control resistor that satisfies the standard of the country (steps 33 and 34). According to this embodiment, the same effects as those of the devices shown in the above-described embodiments can be obtained, and further, the setting operation can be further simplified. Further, FIG. 10 is a flowchart according to the invention shown in claim 3 of the present invention, in which the on / off of the adjusting function of the dial pulse waveform adjusting unit 10 is set by software on the system side. It is configured in. Then, the setting status is displayed visually on the operation display unit 11 of the system (for example, LED or LCD).
So that it can be displayed.

That is, the dial pulse waveform adjusting unit 10
To turn on the adjusting function of No. 2, the system enters the current control resistance selection mode of the dial pulse waveform adjusting unit 10 in step 44, and the resistance value R described above is used as the current control resistance.
A signal indicating which of the two resistors R1 and R2 is selected is output. Based on this, the network controller sets the current control resistor to the one indicated (steps 45-4).
7). Next, the system side displays the result of the setting on the operation display unit 1.
It is displayed on the visible display means such as the LCD of No. 1 (step 43).
If the adjustment function of the dial pulse waveform adjustment unit 10 is not turned on in the determination in step 41, the process proceeds to step 42 and the content of the parameter set by the current country code is fixed as it is.

According to this embodiment, the same effects as those of the devices shown in the above-described embodiments can be obtained, and the setting status of the adjusting function of the dial pulse waveform adjusting unit 10 can be easily grasped. The practical effect of becoming is obtained. It is needless to say that each of the above embodiments is an example of the present invention and the present invention should not be limited to this. For example, the dial pulse waveform adjusting unit 10
Selection of the current control resistor of the two resistance values R shown in the embodiment.
It is not limited to selecting one of the resistors having R1 and R2, and may be configured to have three or more options. Needless to say, various selection methods other than those shown in the embodiments can be used.

[0014]

As described above in detail, according to the present invention, the induced electromotive force of the transformer when the DS relay is opened is not increased and the accurate dial pulse transmission is not possible. Further, the remarkable effect that the network control device such as the communication terminal device capable of conforming the current value of the post pulse to the standard can be realized.
Further, in the network control device such as the communication terminal device according to the present invention, the switches SW and D of the dial pulse transmitting unit described above are used.
Since the characteristic variation of the photocoupler PC used for the S relay can be absorbed, the yield of the photocoupler PC used for the switch SW and the DS relay is greatly improved, which is also a large secondary effect.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a communication terminal apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram schematically showing the operation of a dial pulse transmission unit.

FIG. 3 is a diagram showing a dial pulse waveform in a general network control device.

FIG. 4 is a diagram showing a configuration example of a switch SW and a DS relay of a conventional dial pulse transmission unit.

FIG. 5 is a diagram showing a specific configuration example in which either one of the two resistance values R1 and R2 used in the embodiment can be selected.

FIG. 6 is a diagram showing a hard jumper used in the specific configuration shown in FIG.

FIG. 7 is a diagram showing a relationship between a value of a current control resistance value R _X and a waveform of a dial pulse in the related art.

FIG. 8 is a block diagram showing another example of the dial pulse waveform adjusting section 10 according to the embodiment shown in FIG.

FIG. 9 is a flowchart according to the invention shown in claim 4 of the present invention.

FIG. 10 is a flowchart according to the invention shown in claim 3 of the present invention.

FIG. 11 is a diagram showing a dial pulse having a regular dial pulse waveform.

[Explanation of symbols]

1 Telephone line 2 External telephone 3 Off-hook detection unit 4 Dial pulse transmission unit 5 Insulation transformer 6 DS relay 8 Call signal detection unit 9 OH relay 10 Dial pulse waveform adjustment unit 11 Operation display unit 12 CPU 13 RAM 14 ROM 15 Communication control unit 16 Encoding / Decoding Section 17 Modem 18 Scanner 19 Interface Circuit Between CPU 12 and Scanner 18 20 Plotter 21 Interface Circuit Between CPU 12 and Plotter 20

Claims (5)

[Claims] 1. An off-hook detection unit for detecting polarity reversal, a dial pulse transmission unit for transmitting a dial pulse or closing a DC loop, and a signal transmission / reception with a line are electrically isolated. Insulation transformer, dial short relay to prevent induced electromotive force of the transformer when sending dial pulse, ringing signal detector for detecting ringing signal from exchange, switching between external telephone side and insulation transformer side In a network control device such as a communication terminal device having a line switching relay for performing the above, waveform control means for adjusting the waveform of the dial pulse is provided. 2. A network control device such as a communication terminal device according to claim 1, further comprising, in addition to the respective means, means for controlling the waveform adjusting means by software. 3. The communication terminal device according to claim 1, further comprising, in addition to the respective means, means for outputting the setting status of the dial pulse waveform adjusting function by the waveform adjusting means to the display means. Web controller. 4. In addition to the respective means, means for storing the dial pulse waveform adjustment value by the waveform adjusting means corresponding to the country code set for each country, and corresponding to this by specifying the country code 4. A network control device such as a communication terminal device according to claim 1, further comprising means for setting a dial pulse waveform adjustment value. 5. The network of a communication terminal device or the like according to claim 4, further comprising, in addition to the respective means, means for controlling the presence / absence of setting of the function of the dial pulse waveform adjustment value setting means by software. Control device.