JPH0710085B2 - Line pull-in control method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a line pull-in control system in a subscriber line idle service between a telephone exchange and a subscriber.

(Prior Art) Conventionally, this type of system is normally used, that is, a telephone exchange.
Subscriber line-Connect the devices required for service in parallel through the wiring board in the office and the rosette in the house while the telephone is connected, and monitor the empty or used state of the subscriber line and control between the above devices. When a signal is transmitted and received and the subscriber line is empty, various information such as broadcast, music, data, etc. is provided to the subscriber from an information source connected to the in-station device.

FIG. 2 is a block diagram showing the case of broadcasting or music in a conventional subscriber line empty service,
This will be described below.

The in-station device 24 is connected in parallel with the telephone exchange 21 by a wiring board (hereinafter referred to as MDF) 22, and a monitoring circuit 240 constantly monitors the states of the subscriber lines 26a and 26b, that is, whether the lines are empty or in use. . The monitoring circuit 240 calls the telephone 27 when the subscriber goes off-hook or calls from the telephone exchange 21 (incoming call).
When there is a subscriber line, the relay 241
The relay contacts 241a and 241b are opened and the amplifier 2
43 and the PB signal receiving circuit (hereinafter referred to as PBREC) 242 are disconnected from the subscriber lines 26a and 26b. When the subscriber line is empty, the monitoring circuit 240 detects it, restores the relay 241, closes the relay contacts 241a and 241b, and the amplifier 243 and PBREC2.
42 is connected to the subscriber lines 26a and 26b. The PBREC 242 receives the information selection signal (PB signal) sent from the home device 25 via the subscriber lines 26a and 26b, and controls the selection circuit 244. Further, the selection circuit 244 selects one of the input terminals 441 to 44n, sends broadcast or music (hereinafter referred to as service information) from an information source (not shown) to the amplifier 243, and relay contact 2
Home device 25 via 41a, 241b and subscriber lines 26a, 26b
Sent to. The home device 25 is a telephone with a rosette 23.
27 connected in parallel with the monitoring circuit 250
The status of a and 26b is constantly monitored. The monitoring circuit 250 is an internal device 24.
Similarly to the monitoring circuit 240 of No. 2, when the subscriber line is in use, the relay 251 is operated, the relay contacts 251a and 251b are opened, and the amplifier 254 and the PB signal oscillation circuit (hereinafter referred to as PBOSC).
The 255 is disconnected from the subscriber lines 26a and 26b. PBOSC255 is a control panel
A PB signal, which serves as a selection signal for selecting the service information desired by the subscriber by means of 256, is sent to the in-station device 224 through the amplifier 254. The service information selected by the subscriber is provided to the subscriber by the speaker 253 via the amplifier 252.

(Problems to be Solved by the Invention) The configuration example in the case of broadcasting or music in the conventional subscriber line empty service has been described above, but there are the following problems. That is, the interface circuit of a conventional telephone exchange (hereinafter referred to as a subscriber circuit) generally has a structure as shown in FIG. 3 when the subscriber line is empty. In the figure, 31 is an A-line side input terminal and 32 is a B-line side input terminal to which a subscriber line is connected. 33 is a talkie sending circuit, which sends a talkie to the subscriber in the event of a failure,
Normally, a DC loop is formed together with the relay 34 to the off-hook of the subscriber. Reference numeral 35 is an intra-station power supply common to all subscribers, and the output of the relay 34 is multi-connected to all subscriber circuits. On the other hand, since the talker sending circuit 33 is also multi-connected by a plurality of subscriber circuits, an equivalent circuit as shown in FIG. 4 is obtained when a plurality of subscribers are simultaneously provided with this service. The first problem from FIG. 4 is that the service information from the in-station device is transmitted unbalanced because the impedance Z _T of the torch transmission circuit is quite low.
Induced noise from other lines or commercial power sources causes deterioration of service quality.

The second problem is crosstalk between subscribers who are provided with the service by the impedance Z _L of the relay (the lower the impedance Z _{L, the} greater the crosstalk).

In addition, when an incoming call arrives at a subscriber during the service, a high-voltage call signal is input to the in-office device and the in-home device, so that it is necessary to increase the withstand voltage of the amplifier and the selection signal transmitting / receiving circuit.

The present invention eliminates the drawbacks of service quality deterioration, crosstalk between subscribers, and high withstand voltage circuit as described above, and provides a line pull-in control system in a subscriber line idle service having excellent service quality and economy. It is a thing.

(Means for Solving the Problems) In order to achieve this object, the present invention provides an in-station device and an in-home device at both ends of a subscriber line connecting an exchange and a subscriber terminal, that is, inside a premises and inside a premises, respectively. Set up and use the idle time when the subscriber line is not used for communication through the exchange, transfer signals between the in-office device and the in-home device, and specify the subscriber from the in-office device to the in-home device In the subscriber line idle utilization service for providing information, switching means for selectively connecting the line from the exchange and the information transmitting means for providing the information specified by the subscriber to the subscriber's line in the station device, and the exchange. Monitoring means for detecting an incoming call from the subscriber, polarity reversing means for supplying power to the in-home device via the subscriber's line and reversing the polarity of the power source, and call detection for detecting a call from the subscriber terminal. Means and Provided,
A subscriber line is introduced into the in-home device so as to be connected in parallel with the subscriber terminal, and a call origination detection circuit for detecting a call origination, and an information receiving means for receiving service information selected by the subscriber,
A connection / disconnection means that can be connected / disconnected is provided between the transmission detection circuit and the information reception means, and when the idle service is being provided, the exchange is disconnected, and the information transmission means in the station device and the information reception in the home device are always available. Means is connected to the subscriber line, and if the subscriber receives an incoming call while providing the idle service, the polarity reversing means in the in-station device inverts the voltage polarity of the subscriber line in the in-home device. After disconnecting the information receiving means from the subscriber line by controlling the connecting / disconnecting means, operating the switching means of the in-station device to connect the subscriber line to the exchange, and if the subscriber originates while providing the idle service, The transmission detection means in the device and the transmission detection circuit in the home device respectively detect the transmission, and the information transmission means in the intra-office device is controlled by the switching means. Control After disconnecting from the subscriber line by the a line pull-in control system, characterized in that connected to the subscriber line a line from the exchange via the switching means.

(Operation) According to the above-mentioned means, in the present invention, since the telephone exchange is disconnected while the service is being provided, the impedance on the exchange side cannot be seen, and perfect balanced transmission of various services becomes possible. Crosstalk between persons is eliminated, and high quality service can be provided.

Therefore, the problem can be eliminated.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.
11 is a telephone exchange, 12 is a telephone exchange 11 and subscriber lines 16a, 16
Wiring board that connects b, 13 is telephone 17 and subscriber lines 16a, 16b
Rosettes, 14 and 15 for connecting with each other, an internal device and a home device required for the service, and 481 to 48n are input terminals to which service information from an information source (not shown) is input.

First, when the subscriber lines 16a and 16b are empty, the in-station device 14,
The contacts 144a, 144b of the relay 144 and the contacts 152a, 152b of the relay 152 provided in the in-home device 15 are closed, and the subscriber operates the operation panel.
Operate the 157. As a result, the PB signal for selecting the desired service information type is the PB signal transmission circuit 156 (hereinafter P
(Referred to as BOSC) and sent to the in-station device 14 via the amplifier 155.

The PB signal is input to the PB signal receiving circuit 145 of the internal device 14,
The output is input to the selection circuit 147 and the service information desired by the subscriber is selected. The selected service information is sent to the home device 15 through the amplifier 146 and provided to the subscriber through the amplifier 153 and the speaker 154.

On the other hand, when an incoming call is received by the subscriber during the service, or when the subscriber makes a call with the telephone set 17, the relay contact 152 is immediately released.
Open a and 152b and switch relay contacts 144a and 144b to the exchange side.

The monitoring circuit 141 constantly monitors the output state of the telephone exchange 11. When the subscriber receives an incoming call, the monitoring circuit 141 detects the calling signal and controls the polarity reversing circuit 142. After a certain period of time, the relay 144 is operated to switch the contacts 144a and 144b to the exchange side.

The polarity reversing circuit 142 supplies a voltage to the detection circuit 151 of the in-home device 15, but in the call monitoring state, it sends a battery (-48V) to the subscriber line 16a and a ground (0V) to 16b (NOR).
When there is a call, the reverse voltage is sent (REV
Power supply).

On the other hand, the detection circuit 143 monitors the state of the telephone set 17, and when the subscriber goes off-hook during the service, it detects a loop through the polarity reversing circuit 142, and activates the relay 144 through the monitoring circuit 141, and the contacts 144a and 144b are also operated. To the exchange side.

The detection circuit 151 detects the voltage of the REV power supply by the polarity reversing circuit 142, or detects the voltage change when the telephone 17 is off-hook even when the voltage of the NOR power supply is input, and activates the relay 152. The contacts 152a, 152b are opened.

(Effects of the Invention) As described in detail above, according to the present invention, since the telephone exchange is disconnected during service provision, the impedance on the exchange side disappears, and perfect balanced transmission of various services becomes possible. Crosstalk between the subscribers who receive it can be eliminated, and high quality service can be provided.

Furthermore, since a high-voltage call signal is not input to the service information transmission / reception circuits such as the amplifiers of the local equipment and the home equipment, it can be realized with a low withstand voltage circuit and is excellent in economic efficiency.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram for explaining a conventional subscriber line empty utilization service system, and FIGS. 3 and 4 are shown in FIG. FIG. 11 …… telephone exchange, 12 …… wiring board, 13 …… rosette,
14 ... In-office device, 15 ... home device, 16a, 16b ... subscriber line, 17 ... telephone, 141 ... monitoring circuit, 142 ... polarity reversing circuit, 143,151 ... detection circuit, 144,152 ... relay, 14
4a, 144b, 152a, 152b …… Relay contact, 145 …… PB signal receiving circuit, 146,153,155 …… Amplifier, 147 …… Selection circuit, 154
… Speaker, 156 …… PB signal oscillation circuit, 157 …… Operating panel,
481-48n …… Input terminals.

Front page continued (72) Inventor Masaharu Kawaguchi 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Inventor Atsushi Ushiwata 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. In-house (72) Inventor Eiichi Ochi 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nihon Telegraph Telephone Co., Ltd. (72) Inventor Eiji Kuwahara 1-1-6 Uchisai-cho, Chiyoda-ku, Tokyo Nihon Telegraph Telephone Incorporated (56) Reference JP 47-45513 (JP, A) JP 49-24004 (JP, A) JP 48-37004 (JP, A)

Claims (1)

[Claims] 1. An in-office device and an in-home device are installed at both ends of a subscriber line connecting an exchange and a subscriber terminal, that is, inside a premises and inside a premises, respectively, and the subscriber line is used for communication through the exchange. In the subscriber line idle service, which transfers information between the in-station device and the in-home device by using the unused time, and provides the information specified by the subscriber from the in-station device to the in-home device, The switching means for selectively connecting the line from the exchange and the information transmission means for providing the information specified by the subscriber to the subscriber line, the monitoring means for detecting an incoming call from the exchange, and the via the subscriber line. Then, a polarity reversing means for supplying power to the in-home device and reversing the polarity of the power source, and a call detecting means for detecting a call from a subscriber terminal are provided, and a subscriber line is added to the in-home device. Parallel with the worker terminal Retraction so that continued, and the outgoing detection circuit for detecting a call, and information receiving means for receiving the service information selected by the subscriber,
A connection / disconnection means that can be connected / disconnected is provided between the transmission detection circuit and the information reception means, and the switch is disconnected when the idle service is being provided, and the information transmission means in the station equipment and the information reception in the home equipment are always available. Means is connected to the subscriber's line, and if the subscriber receives an incoming call during the provision of the empty service, the polarity reversing means in the in-station device reverses the voltage polarity of the subscriber's line After disconnecting the information receiving means from the subscriber's line by controlling the connecting / disconnecting means, operating the switching means of the in-office device to connect the subscriber's line to the exchange, The transmission detection means in the device and the transmission detection circuit in the home device respectively detect the transmission, and the information transmission means in the intra-office device is controlled by the switching means. Control Subscriber after disconnecting from the line, the line pull-in control system, characterized in that connected to the subscriber line a line from the exchange via the switching means by.