JPH05122742A - Signal transmitter and its connection mode discriminating method - Google Patents

Abstract

PURPOSE:To improve a signal transmission system reliability by discriminating automatically the difference between a transmission system to directly couple to a general public line and communicate with the line and a transmission system to communicate through a private branch exchange telephone line without depending on an artificial judgment and setting automatically the power part. CONSTITUTION:In a signal transmitter to perform the signal transmission through a matching means 11 to a general public line and a private branch exchange telephone line, a connection mode discriminating means 12 to discriminate the connection mode of the signal transmitter is provided between external terminals T1 and T2 connected to the general public line and the private branch exchange telephone line and the above-mentioned matching means 11. The connection mode discriminating means 12 is constituted of at least a signal detecting means 12A, first and second switching means 12B and 12C and a control means 12D.

Description

Detailed Description of the Invention

[Table of Contents] Industrial Application Field of the Prior Art (FIG. 4) Problem to be Solved by the Invention Means for Solving the Problem (FIG. 1) Action Example (FIGS. 2 and 3) Effect of the Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal transmission device and a connection form determination method, and more specifically,
The present invention relates to a device that is directly connected to a general public line, a private branch exchange telephone line (hereinafter referred to as a PBX private line), or another signal transmission device, and a method for determining whether the device is a "line connection" or a "direct connection".

[0003]

2. Description of the Related Art FIGS. 4 (a) to 4 (c) are explanatory views of a signal transmission device according to a conventional example, and FIG. 4 (a) is a configuration diagram thereof.

For example, a signal transmission device which is connected to another signal transmission device via a general public line or a PBX private line, or which is directly connected to another signal transmission device for communication is shown in FIG.
In (a), it comprises a matching transformer 1, a pulse detection circuit 2 and a ringer detection circuit 3.

Further, the external terminal T of the signal transmission device 7
1, T2 are connected to the general public line, the PBX premises line 5, or directly to the external terminals T1 and T2 of another signal transmission device 6, and the matching transformer 1 is a handset or a MODEM [modem].
Are connected (see FIGS. 4B and 4C).

In the first transmission system in which the signal transmission device 7 is directly connected to another signal transmission device 6 for communication,
It is necessary to connect the power supply unit 4 to the external terminals T1 and T2 (see FIGS. 4A and 4B).

However, the general public line and the PBX private line 5
In the second transmission system that communicates with another signal transmission device 6 via the power source 5A connected to the PBX private line 5 or the like.
Since the operating current is supplied by, the power supply unit 4 becomes unnecessary.

Further, FIG. 4 (c) is a block diagram for explaining a connection form of the signal transmission device. In FIG. 4C, whether the signal transmission system is the first transmission system or the second
It is artificially determined whether or not this is a transmission system. For example, the electrical continuity between the external terminals T1 and T2 and the matching transformer 1 is cut off, the voltage at both ends thereof is detected, or the ammeter is connected between the one line connected to the external terminal T1 and the one line of the matching transformer 1. Etc., and the presence or absence of the operating current was detected with the matching transformer 1 connected.

As a result, when voltage or current is detected, it is determined that the second transmission system communicates via the general public line 6 or the PBX private line, and the power supply unit 4 need not be attached. Had decided.

[0010]

By the way, according to the conventional example, the judgment of the first transmission system or the second transmission system to which the signal transmission device 7 is applied is artificially made, and the power supply unit at that time is determined. 4 is determined to be necessary or unnecessary, and as shown in FIG.
The power source unit 4 is connected by a manual changeover switch SW as shown in (c).

Therefore, the difference between the first and second transmission systems is left to artificial judgment, which may lead to erroneous setting of the power supply unit 4. For example, the signal transmission device 7
Is connected to the general public line or the PBX private line 5, but the power supply units 4 are connected in a multiplexed manner, and conversely, are directly connected to another signal transmission device 6 for communication. In the above transmission system, the power supply unit 4 may not be connected.

As a result, the original signal transmission function of the signal transmission device 7 is not exerted, and it takes a lot of processing time for normalizing the connection and the reliability of the signal transmission system is deteriorated. There is.

The present invention was created in view of the problems of the conventional example, and communicates with a transmission system that is directly connected to another signal transmission device for communication via a general public line or a PBX private line. It is possible to automatically discriminate the difference from the transmission system without relying on artificial judgment, and at the same time, to automatically set the power supply unit to improve the reliability of the signal transmission system. It is an object of the present invention to provide a signal transmission device and a connection form determination method.

[0014]

[Means for Solving the Problems] FIGS. 1 (a) and 1 (b) are
FIG. 3 is a principle diagram of a signal transmission device and a connection form determination method thereof according to the present invention.

The signal transmission apparatus of the present invention is a signal transmission apparatus for transmitting a signal to a general public line or a PBX private line through a matching means 11 as shown in FIG.
A connection form determination unit 12 for determining the connection form of the signal transmission device is provided between the matching unit 11 and the external terminals T1 and T2 connected to the general public line or the PBX private line.

In the signal transmission device, as shown in FIG. 1 (b), the connection form determining means 12 matches at least the signal detecting means 12A for detecting the operation signal i and the external terminals T1 and T2. A first switching means 12B for controlling connection with the means 11 and the external terminal T
From the second switching means 12C for controlling the connection of the power supply unit 13 supplied to the terminals 1 and T2, and the control means 12D for controlling the input / output of the signal detecting means 12A and the first and second switching means 12B, 12C. It is characterized by being formed.

Further, the method of determining the connection state of the signal transmission device of the present invention is a signal transmission system for transmitting signals in conformity with a general public line or a PBX private line, after the power is turned on or after the communication is completed. The operating current i is detected based on the closed circuit state of, and the automatic determination process of the connection form of the signal transmission system is performed based on the detecting process.

In the method of determining the connection form of the signal transmission device, the process of detecting the operating current i is performed between the external terminals T1 and T2 and the matching means 11 and the external terminal T.
1 and T2 are temporarily opened and the power supply unit 13 supplied to
After the open state, the external terminals T1 and T2 and the matching means 11 are electrically closed, and the power supply unit 13 is cut off. To achieve.

[0019]

[Operation] According to the signal transmission device of the present invention, FIG.
In the signal transmission device for transmitting a signal to the general public line or the PBX private line through the matching means 11 as shown in FIG. 1, the signal detection means 12A, the first and second switching means 12B and 12C, and the control means 12D. The connection form discrimination means 12 is provided.

Therefore, the control means 12D is provided between the external terminals T1 and T2 and the matching means 11 when the power is turned on or after the communication is completed.
When the connection is controlled by the first switching means 12B via, the operation signal i is detected by the signal detecting means 12A. Further, based on the detection of the operation signal i, the external terminal T1,
The power supply unit 13 for supplying to T2 is the second switching means 12
The connection is controlled by C.

Thus, the difference between the transmission system that directly communicates with another signal transmission device and communicates with the transmission system that communicates via the general public line or the PBX private line is not left to artificial judgment. To automatically determine this,
Also, the power supply unit 13 can be automatically set.

Further, according to the connection state determination method of the signal transmission device of the present invention, the signal transmission system is detected based on the detection process of the operating current i related to the closed circuit state of the signal transmission system after the power is turned on or after the communication is completed. The connection type is automatically discriminated.

For example, the external terminals T1 and T2 and the matching means 1
1 and the power supply unit 13 for supplying to the external terminals T1 and T2
Are once opened and then the external terminals T1, T2
The operating current i is detected and processed in a state where the circuit between the power supply unit 13 and the matching unit 11 is electrically closed and the supply state of the power supply unit 13 is cut off.

Therefore, when the operating current i is detected, it is automatically determined to be a transmission system that communicates via a general public line or a PBX private line, and when the operating current i is not detected. , It is automatically determined to be a transmission system that communicates directly with another signal transmission device.

As a result, it becomes possible to automatically set the power supply unit 13 based on the automatic judgment processing. From this, when the signal transmission device is connected to the general public line or the PBX private line as in the conventional example, the power supply unit 13 is used.
Will not be multiplexed and connected. In addition, in a transmission system that directly communicates with another signal transmission device,
The disconnection of the power supply unit 14 is avoided.

As a result, the original signal transmission function of the signal transmission apparatus is fully exerted, the processing time for normalizing the incorrect connection as in the conventional example is eliminated, and the reliability of the signal transmission system is improved. It is possible to plan.

[0027]

Embodiments of the present invention will now be described with reference to the drawings. 2 and 3 are diagrams for explaining the signal transmission device and the connection form determination method according to the embodiment of the present invention.
FIG. 2 shows a block diagram of a signal transmission device according to an embodiment of the present invention.

For example, a signal transmission device for transmitting signals in conformity with a general public line, a PBX private line, or another signal transmission device is shown in FIG.
It comprises a matching transformer 1, a pulse detection circuit 2, a ringer detection circuit 3 and a power supply unit 13.

That is, the connection state judging circuit 22 is an embodiment of the connection form judging means 12, and the current detecting circuit 22A,
Resistors R1, R2, first and second relays RLY1, RLY2
It is composed of a CPU (Central Processing Unit) 22D. The current detection circuit 22A and the resistor R1 are an example of the signal detection means 12A, and detect a current that is an example of the operation signal i flowing through the resistor R1. The detection current i is converted from analog to digital, and the detection data Di is output to the CPU 22D.

The first relay RLY1 is an embodiment of the first switching means 12B, and the connection state between the external terminals T1 and T2 and the matching transformer 1 is determined based on the first control signal S1 from the CPU 22D. It controls opening and closing.

The second relay RLY2 is an embodiment of the second switching means 12C, and opens / closes the connection state of the power supply section 13 supplied to the external terminals T1 and T2 based on the second control signal S2 from the CPU 22D. It controls.

The CPU 22D is an embodiment of the control means 12D, and includes a current detection circuit 22A and first and second relays RLY1,
It controls the input and output of RLY2. For example, the first and second control signals S1 and S2 are output to the first and second relays RLY1 and RLY2 respectively, and whether the signal transmission device is a general public line, a PBX private line, or another signal transmission device. It is for determining the connection mode for recognizing whether or not the connection is established.

The matching transformer 1 is a transformer that matches the signal transmission device with the general public line, the PBX private line, or another signal transmission device, and is normally terminated to 600 [Ω]. The pulse detection circuit 2 detects a pulse signal or the like transmitted. The ringer detection circuit 3 detects a ringing tone or the like.

The power supply unit 13 supplies an operating voltage to the signal transmission system when the signal transmission device is directly connected to another signal transmission device for communication. For example, -48
[V] voltage, ground wire GND = 0 [V] is the second relay R
It is applied to the external terminals T1 and T2 via LY2. In addition,
When communicating via the general public line or the PBX private line 5, the operating current is supplied from the power supply 5A connected to the PBX private line 5 or the like, so that the power supply unit 4 is not necessary (see FIG. See b)).

As described above, according to the signal transmission apparatus according to the embodiment of the present invention, as shown in FIG. 2, in the signal transmission apparatus for transmitting the signal in conformity with the general public line or the PBX private line, Current detection circuit 22A, resistors R1, R2
A connection form determination circuit 22 including first and second relays RLY1, RLY2 and CPU 22D is provided.

Therefore, when the power is turned on or after the communication is completed, the CP between the external terminals T1 and T2 and the matching transformer 1 is generated.
When the connection is controlled by the first relay RLY1 via U22D, the current i is detected by the current detection circuit 22A. Further, the connection of the power supply unit 13 supplied to the external terminals T1 and T2 based on the detection of the current i is controlled by the second relay RLY2.

Thus, the difference between the transmission system that directly communicates with another signal transmission device and communicates with the transmission system that communicates via the general public line or the PBX private line is not left to artificial judgment. To automatically determine this,
Also, it becomes possible to automatically connect / disconnect the power supply unit 13.

Next, the connection form determination method will be described while supplementing the operation of the signal transmission device. Figure 3
FIG. 8 shows a connection form determination flowchart according to the embodiment of the present invention.

For example, in the case of determining the connection form of a signal transmission system for transmitting signals in conformity with a general public line, a PBX private line, or another signal transmission device, in FIG. 3, when power is turned on or after communication is completed. , First, in step P1,
The second relays RLY1 and RLY2 are brought into an open circuit (hereinafter referred to as break state) state. At this time, for example, the CPU 22D
From the first and second relays RLY1 and RLY2 respectively, the first and second control signals S1 and S2 are cut off,
The first and second relays RLY1 and RLY2 are "OF
F ”action.

Then, in step P2, the first relay RLY
Only 1 is put in a closed circuit (hereinafter referred to as a make state).
At this time, the first control signal S1 is output from the CPU 22D to the first relay RLY1 and the first relay RLY1 becomes “O”.
N "operation.

Then, in step P3, it is determined whether or not the current i is detected. At this time, in the current detection circuit 22A,
When the current i is detected (YES), the process goes to Step P6 to put the first relay RLY1 into the break state. When the current i is not detected (NO), the process goes to step P4 to put the first relay RLY1 into the break state.

Here, for example, if a general public line or a PBX private line is connected to the signal transmission device, the current i flowing through the resistor R1 is detected by the current detection circuit 22A, and it is converted from analog to digital. , The detection data Di is output to the CPU 22D.

In step P5, a general public line or P
It is determined that there is no direct connection of the BX premises line or the like, that is, a state in which another signal transmission device and the signal transmission device are directly connected. At this time, the second relay RLY2 is put in the make state. For example, the second control signal S2 is output from the CPU 22D to the second relay RLY2, and the second relay RLY2 operates "ON".

In step P7, the general public line and P
It is judged as "line connection" with the intervening BX internal line.
At this time, the second relay RLY2 is maintained in the break state and the power supply 13 is cut off. As a result, the signal waiting state is set thereafter in step P8.

As described above, according to the connection mode determining method of the embodiment of the present invention, as shown in the flowchart of FIG.
[Ω] Automatic determination processing of the connection form of the signal transmission system is performed based on the detection processing of the current i related to the termination state.

For example, between the external terminals T1 and T2 and the matching transformer 1 and the power supply unit 13 which supplies the external terminals T1 and T2, at step P1, the first and second relays RLY.
1, RLY2, a break state is once set, and thereafter, in step P2, the external terminals T1 and T2 and the matching transformer 1 are electrically set to a make state, and the supply state of the power supply unit 13 is cut off. In the state, the current i is detected and processed.

Therefore, when the current i is detected in step P3 (YES), it is automatically determined to be a transmission system which communicates via a general public line or a PBX private line, and the current i is detected. If not (NO), it is automatically determined to be a transmission system that directly communicates with another signal transmission device for communication.

As a result, it becomes possible to automatically connect / disconnect the power supply unit 13 based on the automatic judgment processing.
From this, when the signal transmission device is connected to a general public line or a PBX private line as in the conventional example,
The power supply units 13 are not connected in a multiple manner. On the contrary, in the transmission system in which communication is performed by directly connecting to another signal transmission device, disconnection of the power supply unit 13 is also avoided.

As a result, the original signal transmission function of the signal transmission device is fully exerted, the processing time for normalizing the incorrect connection as in the conventional example is eliminated, and the reliability of the signal transmission system is improved. It is possible to plan.

[0050]

As described above, according to the signal transmission device of the present invention, the connection form discrimination means including the signal detection means, the first and second switching means and the control means is provided.

For this reason, the difference between the transmission system that directly communicates with another signal transmission device for communication by the connection form discrimination means and the transmission system that communicates via the general public line or the PBX private line is used for artificial judgment. It is possible to automatically discriminate this and automatically connect / disconnect the power supply unit without being entrusted with it.

Further, according to the method for determining the connection state of the signal transmission device of the present invention, the signal transmission system of the signal transmission system is detected on the basis of the detection process of the operating current related to the closed circuit state of the signal transmission system after the power is turned on or after the communication is completed. The connection type is automatically determined.

Therefore, when the operating current is detected, it is automatically determined to be the transmission system which communicates via the general public line or the PBX private line, and when the operating current is not detected, another system is detected. It is automatically determined to be a transmission system that communicates directly with the signal transmission device.

Further, since the power supply unit is automatically set based on the automatic judgment processing, when the signal transmission device is connected to the general public line or PBX private line as in the conventional example, the power supply unit is set. Will not be multiplexed and connected. In addition, in a transmission system in which communication is performed by directly connecting to another signal transmission device, disconnection of the power supply unit is also avoided.

As a result, the original signal transmission function of the signal transmission device can be fully exerted, and the reliability of the signal transmission system can be improved.

[Brief description of drawings]

FIG. 1 is a principle diagram of a signal transmission device and a connection form determination method thereof according to the present invention.

FIG. 2 is a configuration diagram of a signal transmission device according to an embodiment of the present invention.

FIG. 3 is a flowchart for determining a connection form according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram of a signal transmission device according to a conventional example.

[Explanation of symbols]

 11 ... Matching means, 12 ... Connection form determining means, 13 ... Power supply section, 12A ... Signal detecting means, 12B, 12c ... First and second switching means, 12D ... Control means, i ... Operation signal.

Claims (4)

[Claims] 1. A signal transmission device for transmitting a signal to a general public line or a private branch exchange telephone line through a matching means (11), wherein an external terminal (T1) connected to the general public line or the private branch exchange telephone line. , T2) and the matching means (1
A signal transmission device characterized in that a connection form determination means (12) for determining the connection form of the signal transmission device is provided between the signal transmission device and 1). 2. The signal transmission device according to claim 1, wherein
The connection form determination means (12) controls connection between at least the signal detection means (12A) for detecting the operation signal (i), the external terminals (T1, T2) and the matching means (11). A second switching means (12C) for controlling connection between a first switching means (12B) and a power supply section (13) supplied to the external terminals (T1, T2), the signal detecting means (12A) and a second switching means (12A). Control means (12D) for controlling input / output of the first and second switching means (12B, 12C)
A signal transmission device comprising: 3. In a signal transmission system for transmitting a signal in conformity with a general public line or a private branch exchange telephone line, the operating current (i) based on the closed circuit state of the signal transmission system is turned on at the time of power-on or after the end of communication. A connection form determination method for a signal transmission device, which comprises performing a detection process and automatically determining a connection form of the signal transmission system based on the detection process. 4. The method of determining the connection form of a signal transmission device according to claim 3, wherein the detection process of the operating current (i) is
A power supply unit (1) for supplying between the external terminals (T1, T2) and the matching means (11) and the external terminals (T1, T2).
3) is once opened, and after the open state, the external terminals (T1, T2) and the matching means (11) are electrically closed circuit, and the power supply section (13) A method for determining a connection form, which is performed in a state where the supply state is cut off.