JPH05268376A - Network controller and its connection destination identification method - Google Patents

Abstract

PURPOSE:To attain high efficiency for line control without cost increase by providing a multiplexer to a terminal for detecting a DC state of a line of a line connection section. CONSTITUTION:A network controller 1a identifies a line connection section 6a of configuration provided with a multiplexer 9 to send a DC state from one and same terminal by providing a connection destination identification section 10 to a line control section 7. If the connection destination is a 1st line connection section able to accommodate any of external lines 4a, 4b or extensions 5a, 5b, even when a 2nd selection control signal is sent through a signal line 8h, the DC state sent through signal lines 8e, 8f corresponding to the 2nd selection control signal is not a specific DC state but a DC state corresponding to any of the external lines 4a, 4b or extensions 5a, 5b. Thus, the line control section 7 identifies the connection destination to be the 1st line connection section.

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 for connecting a data communication terminal such as a facsimile or a computer to an analog line such as a telephone line, and more particularly to a line accommodation form of two lines or one line. The present invention also relates to a network controller that can be flexibly dealt with and a connection destination identification method thereof.

[0002]

2. Description of the Related Art When a data communication terminal such as a facsimile or computer is connected to an analog line such as a public telephone line, a network control device (modem) for analog / digital conversion of data is provided between the line and the line. NCU: N
A network control unit is provided, and this network control device activates and restores the switching equipment of the data communication handling station, sends a selection signal, and confirms a response to the arriving person.

A data communication terminal may be used by being connected not only to an external line (analog line) such as a public telephone line but also to an internal line (analog line) such as a private line for a premises. For example, Japanese Patent Laid-Open No. 2-82858. As described in the publication, a network control device for selectively connecting a facsimile or the like to either an external line or an internal line has been developed.
This network control device automatically distinguishes between a first line connection unit that accommodates one line of an external line and an extension line and a second line connection unit that accommodates two lines of both an external line and an extension line. A line control unit for performing line control corresponding to the identified line connection unit is provided. By this,
The same line control unit can be used regardless of which of the first and second line connection units is used, and the cost of the network control device can be reduced.

In this network control device, the first line connection part and the second line connection part are identified based on the DC state of the accommodated line detected by each line connection part. That is, a terminal for detecting the DC state of an unaccommodated line is provided in the first line connection unit, the output state of this terminal is set to a fixed value, and this fixed output is detected to The line connection part is identified. It should be noted that if a corresponding output other than the fixed output is detected, it is identified as the second line connection unit.

However, in recent years, in the network control device, in order to reduce the number of control signals, a multiplexer or the like is provided on the second line connection unit to connect with the line control unit. For this reason, in the conventional second line connection unit,
The terminals for detecting the DC state of the lines provided for the accommodated lines are respectively integrated into one, and the number is the same as that of the first line connecting portion. That is, even in the second line connection portion, there is no DC state detection terminal for the second analog line. Therefore, in such a network control device, in order to identify the line connection portion as in the prior art, it is necessary to provide a multiplexer or the like on the first line connection portion only for the purpose of identification.

[0006]

The problem to be solved is that in a network control device equipped with a multiplexer for reducing control signals, the terminal for detecting the direct current state of the line in the second line connection section is , The same number as that of the first line connecting unit, and when the first line connecting unit and the second line connecting unit are distinguished from each other by the conventional technique, the first line connecting unit is connected to the first line connecting unit. However, it is necessary to provide a multiplexer and the like, which is very uneconomical in terms of cost. The object of the present invention is to solve these problems of the prior art,
The second line connection part and the first line connection part, which have the same number of terminals for detecting the DC state of the line by the multiplexer and the like, are automatically distinguished from each other without increasing the cost. To provide a network control device and a connection destination identification method thereof that can reduce the number of lines and improve the efficiency of line control.

[0007]

In order to achieve the above object, the network control device of the present invention comprises: (1) a first analog line that accommodates one analog line and outputs the DC state of this analog line.
Line connection unit, a second line connection unit that accommodates two analog lines and outputs the DC state of each analog line, and a first line connection unit and a second line connection unit based on the DC state Which network is connected, and based on the identification result, a network control device comprising a line control unit for performing line control corresponding to the first line connection unit or the second line connection unit, The second line connection unit selectively outputs the DC states of the two analog lines to the line control unit via the same terminal in response to the input of the first selection control signal from the line control unit. The second from the line control unit
In response to the input of the selection control signal of, the direct current state output control unit which sends out a specific direct current state not corresponding to any of the two analog lines to the line control unit through the same terminal,
Further, the line control unit inputs to the input terminal for inputting the DC state from the connected first line connection unit or the second line connection unit, and to this input terminal when outputting the second selection control signal. It is characterized by comprising a connection destination identifying unit for identifying the connection destination as either the first line connecting unit or the second line connecting unit based on the input DC state. (2) In the network control device described in (1) above, the DC state output control unit is composed of a multiplexer. Also, (3) above (1) or (2)
In the method of identifying a connection destination of a network control device according to any one of items 1 to 5, the connection destination identification unit, when outputting the second selection control signal,
The DC state input to the input terminal is detected, and if the detected DC state is a specific DC state from the DC state output control section of the second line connection section, the second line connection section is connected. If it is not a specific DC state,
It is characterized in that the first line connection unit is identified as being connected.

[0008]

In the present invention, if the second line connection unit is connected to the line control unit, the DC input from the DC state output control unit such as a multiplexer in response to the transmitted second selection control signal. The state is a specific DC state different from both the outside line and the inside line. Further, if the first line connection unit is connected to the line control unit, the DC state input corresponding to the transmitted second selection control signal is either the external line or the internal line DC state. .. In this way, the line control unit can identify the line connection unit configured to send the DC state from the same terminal by detecting the DC state at the time of transmitting the second selection control signal. The control unit can perform the line control process as in the conventional case.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of a configuration relating to the present invention of a network control device of the present invention. The network control device 1a of the present embodiment is connected to a telephone 2 and a facsimile 3 having a modem (not shown) incorporated therein, which accommodates two lines of external lines 4a and 4b and internal lines 5a and 5b, and the telephone 2 Second line connection unit 6a to be connected, external lines 4a, 4b and internal lines 5a, 5b are selected, automatic line arrival / departure is performed for the selected line, and selective connection of the selected line to the facsimile 3 of the telephone 2 is performed. It is composed of a line control unit 7 that performs processing. The line connection unit 6a and the line control unit 7 exchange various signals via the signal lines 8a to 8h. For example, in the signal lines 8a and 8b,
Signals to the external lines 4a and 4b, signals to the internal lines 5a and 5b for the signal lines 8c and 8d, signals for the external lines 4a and 4b and internal lines 5a and 5b to the signal lines 8e and 8f, and signal lines In 8g and 8h, from the line control unit 7 to the line connection unit 6
The selection control signal to a is exchanged. The line connecting unit 6a selects one of the DC states of the external lines 4a and 4b and the internal lines 5a and 5b based on the first selection control signal sent from the line control unit 7 via the signal line 8g. do it,
Based on the second selection control signal sent from the line control unit 7 via the signal line 8h while being sent to the line control unit 7 via the signal lines 8e and 8f, the external lines 4a and 4b and the internal line 5a, A multiplexer 9 is provided as a DC state output control unit that selects a specific DC state different from any of the DC states of 5b and sends it to the line control unit 7 via the signal lines 8e and 8f. Further, the line control unit 7 sends the first selection control signal to the multiplexer 9 via the signal line 8g, and based on the direct current state sent via the signal lines 8e and 8f, the outside lines 4a and 4b. And which of the extension lines 5a and 5b are connected, the second selection control signal is sent to the multiplexer 9 via the signal line 8h, and the signal line corresponding to the second selection control signal is sent. 8e, 8
External lines 4a, 4b and internal lines 5a, 5 sent via f
A connection destination identification unit 10 is provided which identifies that the connection destination is the second line connection unit 6a based on a specific DC state different from both b.

As described above, by providing the connection destination identifying unit 10 in the line control unit 7, the network control device 1a of the present embodiment.
Can identify the line connecting unit 6a having the multiplexer 9 and sending the DC state from the same terminal. If the connection destination is the first line connection portion capable of accommodating only one of the external lines 4a and 4b or the internal lines 5a and 5b as shown in FIG. 2, the signal line 8h Even if the second selection control signal is sent via the signal line 8e,
The direct current state sent via 8f is not a specific direct current state, but external lines 4a, 4b or internal lines 5a, 5b.
It corresponds to either of. As a result, the line control unit 7 identifies that the connection destination is the first line connection unit.

FIG. 2 is a block diagram showing a second embodiment of the configuration relating to the present invention of the network control device of the present invention. The network control device 1b of this embodiment is the same as the network control device 1a in FIG.
Similarly to the above, the line control unit 7 connected to the telephone 2 and the facsimile 3 and having the connection destination identification unit 10 is provided.
Instead of the second line connection unit 6a in FIG. 1, a first line connection unit 6b for accommodating either one of an external line and an internal line is provided. In this embodiment, the outer wires 4a and 4b are housed. Further, the line connection unit 6b and the line control unit 7 are
Network control device 1 in FIG. 1 via signal lines 8a to 8h.
The same signal exchange as in a is performed. Line connection part 6b
Accommodates only one line of the external lines 4a and 4b, and is not provided with the DC state output control unit such as the multiplexer 9 included in the line connection unit 6a in FIG. Therefore, even if the connection destination identification unit 10 of the line control unit 7 sends the second selection control signal via the signal line 8h, the line connection unit 6b
Is not taken in and the DC state output to the signal lines 8e and 8f does not change. Thus, when the DC state output to the signal lines 8e and 8f does not indicate a specific DC state at the time of sending the second selection control signal, the connection destination identifying unit 10 causes the first line connecting unit 6b to operate. Can be identified as connected.

FIG. 3 is a circuit diagram showing an embodiment of the internal structure of the second line connection section in FIG. 1 according to the present invention. In the second line connection unit 6b of this embodiment, the outside line 4
The signals on a and 4b are exchanged on the signal lines 8a and 8b via the switch 11 for opening and closing the external lines 4a and 4b, the resistor 13 and the transformer 12. This resistance 1
3, a photocoupler 14 and a resistor 15 are connected in parallel, and the output of the photocoupler 14 has a pull-up resistor 2
It is input to the multiplexer 9 via 7, 28 and the waveform shaping circuits 16, 17. Similarly, the signals on the extension lines 5a and 5b are switched by the switch 2 for closing the extension lines 5a and 5b.
0 and the signal line 8 via the resistor 22 and the transformer 21.
The photocoupler 23 and the resistor 24 are connected in parallel to the resistor 22.
The output of 3 is input to the multiplexer 9 via pull-up resistors 27 and 28 and waveform shaping circuits 25 and 26. Here, the multiplexer 9 receives either the signal input from the waveform shaping circuits 16 and 17 or the signal input from the waveform shaping circuits 25 and 26 according to the first selection control signal from the signal line 8g. Whether to output to 8e or 8f is selected. Further, the multiplexer 9 causes the signal line 8e, the second selection control signal from the signal line 8h,
A signal (DC state) of a specific level different from the signals input from the waveform shaping circuits 16 and 17 and the waveform shaping circuits 25 and 26 is output to 8f. The line control unit 7 in FIG. 1 can identify the connected second line connection unit 6b by using the signal of this specific level as an input.

FIG. 4 is a circuit diagram showing an embodiment of the internal configuration of the first line connection section in FIG. The first line connection unit 6b of the present embodiment accommodates only one line of the outside lines 4a and 4b, and the signals on the outside lines 4a and 4b are the outside lines 4a and 4b.
The signal line 8a, 8b is exchanged with the switch 41 for opening and closing 4b, the resistor 43 and the transformer 42. The resistor 43 includes a photo coupler 44 and a resistor 45.
Are connected in parallel, and the respective outputs of the photocoupler 44 are sent to the signal lines 8e and 8f via the pull-up resistors 48 and 49 and the waveform shaping circuits 46 and 47. Here, the signal lines 8g and 8g for the first selection control signal and the second selection control signal sent from the line control unit 7 in FIG.
Since h is open, the signals on the signal lines 8e and 8f always indicate the DC state of the external lines 4a and 4b. As a result, the line control unit 7 in FIG. 1 can identify the connection of the first line connection unit 6b. The symbol lines 8c and 8d are connected to the transformer 40 whose primary side is open.

FIG. 5 is an explanatory view showing an embodiment of the operation of the connection destination identification section in FIG. 1 according to the present invention. This figure shows a signal line 8e corresponding to the signal lines 8g and 8h indicating the states of the output first selection control signal and second output selection control signal.
8F is an output table of FIG. 8F, and FIG.
5B corresponds to the first line connection unit 6b in FIG. When the signal line 8g is "L" (low), it is the external line DC state detection mode, and when it is "H" (high), it is the internal line DC state detection mode. Then, the case where the signal line 8h is "H" is the connection destination detection mode. First, in the case where the signal line 8h is "L", the signal line 8g corresponds to each of the "L" and "H" states of the signal line 8g in both FIGS. The outputs of 8e and 8f are any combination of "H" and "H", "L" and "H", or "H" and "L". In FIG. 5B, the extension DC state does not make sense when the first line connecting portion 6b is connected to the outside line as shown in FIG. Next, when the signal line 8h is "H", the connection destination detection mode is set. At this time, as shown in FIG. 2, when the first line connection unit 6b is connected to the line control unit 6,
The signal lines 8e and 8f cannot be at a low level at the same time, and the external line DC state is always output to the signal lines 8e and 8f. In FIG. 5B, the signal lines 8e and 8f are
It is a combination of "H" and "H", "L" and "H", or "H" and "L". However, FIG.
In (a), both the signal lines 8e and 8f are "L". In this way, in the state where both of the signal lines 8e and 8f are "L", the connection destination identification unit 10 in FIG. 1 has the connection destination line connection unit accommodates the two lines in the second line in FIG. The connection portion 6a is identified.

FIG. 6 is a flowchart showing the connection destination identifying operation according to the present invention of the line controller in FIGS. 1 and 2. First, the connection destination identifying unit 10 in FIGS. 1 and 2 sends a second selection control signal to activate (high) the signal line 8h (step 601), and the signal states of the signal lines 8e and 8f at this time point. Enter (Step 60
2) The signal states of the input signal lines 8e and 8f are detected (step 603). Here, the signal line 8e,
If both 8f are at the low level, it is identified that the second line connection unit for accommodating two lines is connected, and control corresponding to accommodating two lines is performed (step 604). If both signals on the signal lines 8e and 8f are not at the low level, it is determined that the first line connection unit that accommodates only one line is connected, and control corresponding to one line accommodation is performed. (Step 605).

As described above with reference to FIGS. 1 to 6, in the network control device of this embodiment, when the second selection control signal is transmitted, the two signal lines indicating the direct current state from the line connection part are transmitted. Identify that the second line connection unit that accommodates two lines is connected only when both become low level, and otherwise, the first line connection that accommodates only one line Identify that the department is connected. As a result, even if the second line connection section for accommodating two lines is configured to include a multiplexer or the like to reduce the control signal, the line control section can be operated by either the first or second line connection section. Whether it is connected can be automatically identified without increasing the cost.
The present invention is not limited to the embodiment described with reference to FIGS.

[0017]

According to the present invention, a second line for accommodating two lines is provided.
Even if the terminals for detecting the direct current state of the line of the line connection unit of (1) have the same number as the first line connection unit for accommodating only one line, the new first Since the first line connection part and the second line connection part can be identified without providing a multiplexer or the like on the line connection part, it is possible to improve the line control efficiency without increasing the cost.

[0018]

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a configuration relating to the present invention of a network control device of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the configuration related to the present invention of the network control device of the present invention.

FIG. 3 is a circuit diagram showing an embodiment of the internal configuration of the second line connection unit in FIG. 1 according to the present invention.

4 is a circuit diagram showing an example of an internal configuration of a first line connection unit in FIG.

5 is an explanatory diagram showing an embodiment of the operation of the connection destination identification unit in FIG. 1 according to the present invention. FIG.

FIG. 6 is a flowchart showing the operation of the line controller in FIGS. 1 and 2 according to the present invention.

[Explanation of symbols]

 1a, 1b Network control device 2 Telephone 3 Facsimile 4a, 4b Outer line 5a, 5b Extension 6a Second line connection part 6b First line connection part 7 Line control part 8a-8h Signal line 9 Multiplexer 10 Connection destination identification part 11 Switch 12 transformer 13 resistor 14 photocoupler 15 resistor 16, 17 waveform shaping circuit 18, 19 pull-up resistor 20 switch 21 transformer 22 resistor 23 photocoupler 24 resistor 25, 26 waveform shaping circuit 27, 28 pull-up resistor 40 transformer 41 switch 42 transformer 43 resistance 44 photo coupler 45 resistance 46, 47 waveform shaping circuit 48, 49 pull-up resistance

Claims (3)

[Claims] 1. A first line connecting means for accommodating one analog line and outputting the DC state of the analog line, and a second line accommodating two analog lines and outputting the DC state of each analog line. Of the first line connecting means and the second line connecting means based on the DC state, and the first line connecting means based on the identification result. Alternatively, it is a network control device comprising line control means for performing line control corresponding to the second line connection means, wherein the second line connection means is
In response to the input of the first selection control signal from the line control means, the DC states of the two analog lines are selectively sent to the line control means via the same terminal and the line In response to the input of the second selection control signal from the control means, a direct current state in which a specific direct current state not corresponding to any of the two analog lines is sent to the line control means via the same terminal. The output control means, the line control means outputs an input terminal for inputting a DC state from the connected first line connection means or second line connection means, and outputs the second selection control signal. Sometimes, a connection destination identifying means for identifying the connection destination as either the first line connecting means or the second line connecting means based on the DC state input to the input terminal is provided. Characterizing The control device. 2. The network control device according to claim 1,
The network control device, wherein the DC state output control means comprises a multiplexer. 3. The connection destination identification method for a network control device according to claim 1, wherein the connection destination identification means inputs the input when the second selection control signal is output. If the direct current state input to the terminal is detected and the detected direct current state is a specific direct current state from the direct current state output control means of the second line connection means, then the second
A method for identifying a connection destination of a network control device, characterized in that the line connecting means is identified as connected, and if not in a specific DC state, the first line connecting means is identified as connected.