JPH0318169A - Subscriber's equipment in off-talk communication system - Google Patents

Abstract

PURPOSE:To simply obtain correct connection polarity at a subscriber's equip ment by registering the polarity detected at power ON into a polarity registra tion memory and discriminating the operating state of a subscriber terminal equipment based on the registered polarity relation. CONSTITUTION:The power supply of a subscriber's equipment is turned on and the initial step is proceeded, then a CPU 2 detects a voltage of talking lines L1, L2 to detect the polarity. When the voltage between X and Y is, e.g., 48V, the connection terminals X,Y are regarded to be connected to the talking lines L1, L2 and the CPU 2 sets '1' to a memory 3 as a polarization registration data. On the other hand, when the voltage is -48V, the terminals X,Y are connected to the talking lines L2, L1 and the CPU 2 registers '2' to the memory 3. When the voltage between X and Y is 48V, the polarity registration data registered in the memory 3 is discriminated and when the data is '1' off-talk communication is attained. On the other hand, when the polarity data is '2', it is discriminated that the polarity condition is not satisfied to disable the off-talk communication.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an information center on the station side, an information receiving facility on the subscriber terminal side's in-home equipment, and a communication system between the station side and the subscriber terminals. The present invention relates to the home device in an off-talk communication system in which an information signal is sent from an information center of an example station to an information receiving facility of the home device via a communication line during an off-talk period when no communication is taking place.

[Conventional technology]

Regarding the off-talk communication method, for example,
This system is well known in the art, as described in Publication No. 1846, "Broadcasting Control System Using Telephone Lines," and Japanese Patent Application Laid-open Publication No. 178029/1980, "Cable Broadcasting Service System," but an outline thereof will be explained below.

FIG. 3 is a block diagram showing an example of a conventional off-talk communication system of this type. As seen in the figure, the off-talk communication method uses an in-office device 1 installed on the exchange 100 side.
10 and an in-home device 130 installed on the subscriber telephone 120 side, which is a terminal, and the in-office device 110 and the in-home device 130 are connected by a communication line 140.

The in-office device 110 also includes an incoming call detection circuit 1l1, a line state detection circuit 112, and a changeover switch S for switching communication lines.
1, and further provided with a channel switching circuit 113 and an information center device 200 connected to the changeover switch Sl via the switching circuit 113. 210 is a line.

On the other hand, the in-home device 130 is provided with an operation section 131, an off-hook detection circuit 132, an incoming call detection circuit 133, a changeover switch S2 for switching communication lines, and a control section 135. A speaker 300 is provided that is connected to switch S2.

When transmitting information by off-talk communication, the control unit 135 operates the operation unit 131 to guide the switch S2 to the broken line position, and at the same time sends out a high resistance loop or a PB signal to the communication line 140. conduct. This signal from the home device 130 is detected by the line state detection circuit 112 of the home device 110, and a control section (not shown) guides the changeover switch S1 to the position shown by the broken line.

As a result, the information signal from the information center device 200 is transferred to the channel switching circuit 113. The signal is sent to the home device 130 via the changeover switch 31 and the communication line 140, and in the home device 130, it is output from the speaker 300 through the changeover switch S2 and the amplifier 134. To convert the information transmission channel, the control section 1 is operated by operating the operation section 131.
36, a predetermined signal is sent from a signal sending means (not shown) to the communication line 140, and the line state detection circuit 112 detects this signal, thereby switching the channel switching circuit 11.
The switching takes place at 3.

To end the off-talk communication, the changeover switch S2 is guided to the solid line position by the operation of the control unit 135 by operating the operation unit 131 of the home device 130, and this is detected by the line status detection circuit 112, as shown in the figure. The changeover switch S1 is also guided to the solid line position by the action of the drain control section.

During information transmission by off-talk communication, the telephone 12
0, the incoming call detection circuit 111 detects an incoming call signal from the exchange 100, switches the selector switch 31 from the broken line position to the solid line position by the action of a control unit (not shown), and sends the call from the communication line 140 to the information center. Disconnect device 200. As a result, the incoming call signal from the exchange 100 is detected by the incoming call detection circuit 133 of the home device 130, and the controller 135 thereby switches the changeover switch S2 from the broken line position to the solid line position, and the telephone 120 is transferred to the communication line 140. It is connected to the exchange 100 through. Therefore, by taking the telephone 120 off-hook, it is possible to make a telephone call.

Furthermore, if the telephone 120 is off-hook while transmitting information by off-talk communication, a DC loop is formed, so the off-footer detection circuit 132 detects this and the controller 135 moves the selector switch S2 to the dashed line position. to the solid line position to connect the telephone 120 to the communication line 140. Furthermore, this state is detected by the line state detection circuit 11.
2, the changeover switch S is detected and illustrated by the control unit.
By switching t from the dashed line position to the solid line position, telephone 120 is connected to exchange 100 through communication line 140. This allows normal outgoing calls from telephone 120.

As explained above, in the off-talk communication method, information is sent and received via the communication line during the off-talk period when telephone communication is not taking place between the central office and the telephone. Therefore, it is necessary to constantly determine the state of the telephone.

A conventional method of determining the status of a telephone in an in-home device will be described below.

FIG. 4 is a block diagram in which the configuration of the in-home device 130 in FIG. 3 is redrawn in slightly more detail for convenience of explanation.

As seen in FIG. 4, the communication line 140 is actually separated from two polarized communication lines Ll and L2.
A voltage polarity detector 136 for detecting the polarity and voltage between the two communication lines Ll and L2 is provided, and a capacitor C1 for cutting off direct current and detecting only alternating current is also provided.

In reality, the state of the phone 120 is determined by the voltage polarity detector 13
6, and the relationship is shown in FIG.

Please refer to FIG. When the telephone 120 is in the on-footer state (at this time, off-talk communication is possible), the state of the line 140 is that the A line on the exchange side across the in-office equipment is at -48V, and the B line is at G. (ground potential)
The L2 line on the terminal side is at -48V, and the L1 line is at G (ground potential). Therefore, the detector 136 detects DC 36 V or more (this condition is defined as (a)), and the polarity condition is that L2 is -4 8 V, L IJ{G (.: (7)
Detects the condition (1:l). In other words,
When the detector 136 detects conditions (a) and (b), it is determined that the telephone 120 is in the on-footer state.

Similarly, if the telephone 120 is in the receiving operation state, the state of the line 140 is 16H for calling between the A line and the B line.
The alternating current of z is superimposed, and the terminal side is in a state where a melody (bell) between the L2 line and the Ll line rings. As a result detector 1
36 detects AC 75V (average value) (this condition is (c)), and as polarity conditions, L2 is G and Ll is -48■
(This condition is set as (2)) is detected. In other words,
When the detector 136 detects conditions (c) and (2), it is determined that the telephone 120 is in the incoming call operation state.

Similarly, when the telephone 120 is in the outgoing operation state, the state of the line 140 is that the A line and the B line are connected, and on the terminal side, the L2 line and the Ll line are connected, and as a result, detection The device 136 detects DC 36V or less (this condition is (e)).
), the polarity conditions are -48V for L2 and G(
Detect condition (b)). In other words, when the detector 136 detects the condition (E) and the condition (口), the telephone 120
It is determined that the is in the transmitting operation state.

? When the telephone 120 is in the talking operation state, the polarity of the line 140 is reversed between the A line and the B line, and as a result, the detector 136 detects 36 V DC or less. (Condition (e)), as a polarity condition, L2 is G,
Ll detects -48v (condition (2)). In other words, when the detector 136 detects the condition (E) and the condition (2), it is determined that the telephone 120 is in the talking operation state.

[Problems to be Solved by the Invention] As explained above, in the conventional off-talk communication system, when connecting the home device 130 to the communication lines LL and L2, it is impossible to connect the home device 130 to the communication lines LL and L2 unless the polarity is mistaken. There was a problem. That is, the voltage polarity detector 136
detects the polarity and voltage between communication lines Ll and L2,
Since the operating state of the telephone 120 is determined by this, the in-home device 130 is first connected to the communication lines Ll, L.
2, if the intended polarity is mistaken and the connection is reversed, the subsequent detection results by the voltage polarity detector 136 will be different, making it impossible to determine the operating state of the telephone I02 at all.

Construction work to implement the off-talk communication method is often carried out from the home equipment side, and if you later complete the work on the station example and try to perform off-talk communication, you will have to change the polarity when connecting the home equipment to the communication line. There may be cases where you are unable to carry out the project because you made a mistake. In this case, the construction worker has to go back and correct the connection polarity, which is very cumbersome.

An object of the present invention is to provide an off-talk communication method that allows the correct connection polarity to be easily obtained at the home equipment side even if such a connection polarity error occurs without requiring a worker to go to each location. The purpose is to provide in-home equipment.

[Means to solve the problem]

In order to achieve the above object, the present invention includes an information center on the station side, an information receiving facility on the subscriber terminal side,
The home device in the off-talk communication method that sends an information signal from the information center of the station to the information receiving equipment of the home device via a communication line during an off-talk period when communication is not taking place between the station side and the subscriber terminal. , a registration means for detecting and registering the polarity relationship between the two communication lines of positive polarity and negative polarity constituting the communication line, and a registration means for detecting and registering the polarity relationship between the two communication lines of positive polarity and negative polarity, and monitoring the polarity and voltage of the two communication lines to monitor the operating status of the subscriber terminal. and determination means for determining.

[Effect]

When the power is turned on, the in-home device detects the polarity relationship in which it is connected to the two communication lines of positive polarity and negative polarity that make up the communication line, and registers the detected polarity relationship. It is registered in memory by a registration means. Thereafter, by monitoring the polarity and voltage of the two communication lines, the determining means determines the operating state of the subscriber terminal in preparation for off-talk communication based on the polarity relationship registered in the polarity registration memory. .

In this way, even if the polarity connection is incorrect, if you turn off the power and then turn it on again, it will be the same as having obtained the correct polarity connection, and there is no need to do any work to change the polarity connection. become.

〔Example〕

FIG. 1 is a block diagram showing the main parts of an embodiment of the in-home device according to the present invention.

In the same figure, the connection terminal for the communication line on the home equipment side is
,Y. 1 is voltage detection interface, 2 is CPU
(Central processing unit), 3 is registration memory, 4 is relay 5
is its power source.

FIG. 2 is a flowchart showing the flow of operations executed by the CPU 2 in FIG.

Please refer to FIGS. 1 and 2. First, in step S1, the power of the home device is turned on, and in step S, initial settings are started.
Proceed to step 2. Next, in step S3, the CPU 2 detects the voltage of the communication line via the voltage detection interface 1 and performs polarity detection.

In other words, in step S4, it is determined whether the connection terminals X and Y on the home equipment side are connected to the communication lines Ll and L2 or to L2 and LL, depending on what voltage state is detected as the detection result. That is to judge.

As seen in step S5, the voltage between X and Y is 48
If it is V, it is determined that the connection terminals X and Y are connected to the communication lines LL and L2, and the CPU 2 sets 1 as polarity registration data in the memory 3, as shown in step S6.

On the other hand, as seen in step S7, if the voltage between X and Y is -48V, the connection terminal χ. Y is the communication line L2,
Determining that it is connected to Ll, the CPU 2 sets 2 as polarity registration data in the memo +73, as shown in step S8. Step S9.10.11 does not require any explanation.

After the above initial settings, the process finally advances to the step of determining the operating state of the telephone. After steps S12 and 13,
As a result, as seen in step S14, if the voltage between If it is 1, it is determined that the polarity condition described above with reference to FIG. 5 is satisfied, and the process proceeds to step S16, where off-talk communication operation becomes possible.

In step S15, if the polarity registration data registered in the memory 3 is 2, it is determined that the polarity condition (ex) is not satisfied, and the process proceeds to step S19, where off-talk communication is disabled.

If the process advances to step 317, day 1, it can be similarly determined whether off-talk communication is possible.

In short, in the present invention, the connection terminals X,
Is Y connected to communication lines L2, Ll?
The standard for determining the status of the telephone is changed depending on whether it is connected to the connection terminal X. Regardless of the polarity of the Y connection, the software executed by the CPU 2 is designed to be able to determine the state of the telephone.

If it is determined that off-talk communication is possible, CPU 2 operates relay 4 and closes switch 2 to enter off-talk communication.

C. Effects of the Invention] As explained above, according to the present invention, even if the polarity is incorrect when connecting a home device to a communication line, the correct polarity connection can be established by turning the power back on and performing the initial settings. This is the same thing as if the construction work had been done, and there is no need for the workers to go out to do the construction work again, which has the advantage of eliminating the troublesome work that previously occurred.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the main parts of an embodiment of the home device according to the present invention, FIG. 2 is a flowchart showing the flow of operations executed by the CPU 2 in FIG. 1, and FIG. A block diagram showing a conventional example, FIG. 4 is a block diagram that redraws the configuration of the home device 130 in FIG. 3 in slightly more detail for convenience of explanation, and FIG. FIG. 3 is an explanatory diagram showing the relationship with detection results. Explanation of symbols 1...Voltage detection interface, 2...CPU, 3
...Memory, 4...Relay, 5...Power supply 130 Figure 4

Claims (1)

[Claims] 1) The station side is equipped with an information center, and the in-home equipment on the subscriber terminal side is equipped with information receiving equipment. In the home device in the off-talk communication method that sends information signals to the information receiving equipment of the home device via a communication line, the home device has two communication lines of positive polarity and negative polarity that make up the communication line. and a registration means for detecting what kind of polarity relationship the two communication lines are connected to when the power is turned on and registering the detected polarity relationship in a polarity registration memory, and thereafter monitoring the polarity and voltage of the two communication lines. In the off-talk communication method, the off-talk communication method is characterized by comprising: a determination means for determining the operating state of the subscriber terminal in preparation for off-talk communication based on the polarity relationship registered in the polarity registration memory. In-home equipment.