JPH03106195A - Repeater for telephone system - Google Patents

Abstract

PURPOSE:To extend the distance from an exclusive use telephone set by supplying power sent from an exchange via a data line for power operating a data relay means and supplying power sent from the exchange via a voice line to the telephone set. CONSTITUTION:A power obtained by separating DO voltage from a data line is used for operating a data relay means provided in a repeater 200 and the power obtained by separating DC voltage from a voice line is fed to an exclusive use telephone set 300 via the data line. Thus, the data sent from the exclusive use telephone set 300 and an exchange 100 are relayed without power supply from an external power supply and the exclusive use telephone set 300 is energized by using a high DC voltage superimposed on the voice line to compensate the voltage drop. Thus, the connection distance of the exclusive use telephone set 300 is extended.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a telephone relay device used by being connected between a private branch exchange and a dedicated telephone.

BACKGROUND OF THE INVENTION Extension terminals connected to private automatic branch exchanges include a variety of WL types, including what is generally called a standard telephone, multifunction telephones, answering machines, facsimile machines, and the like.

In addition, key telephone devices equipped with various service functions in addition to simple exchange functions are becoming popular.

This button telephone device consists of an exchange equipped with various control functions in addition to switching functions, and a button telephone designed exclusively for the exchange.

Two sets of lines are provided between this exchange and each dedicated button telephone: a voice line for transmitting voice signals and a data line for exchanging various control data. For example, the off-hook and on-hook information of a dedicated key telephone is transmitted to the exchange via this data line, and when ringing an incoming call, instead of sending an AC bell signal directly from the exchange over the voice line, The exchange sends a signal to the dedicated button telephone via the data line to generate a ring tone, and the control unit inside the dedicated button telephone receives the command and controls the built-in ringing sound source to generate the ring tone. It happens. This data line is also used to display various information on the dedicated button telephone.

Incidentally, as one of such key telephone devices, there is a so-called hybrid key telephone device that is configured so that a terminal other than a dedicated key telephone, such as the aforementioned standard telephone, can be connected to an exchange. That is, the configuration when looking inside the exchange from the voice line connection terminal is similar to that of a standard exchange, and can be used even when a standard telephone is connected. In such a configuration, when a standard telephone is connected, off-hook and on-footer information is conveyed to the switch by the DC loop current in the voice line. When a call is received, a ringing bell signal is sent to the standard telephone via the same voice line.

Further, when a dedicated telephone is connected to this hybrid key telephone device, power is supplied from the exchange to the dedicated telephone by superimposing direct current on the data line. Further, since there is no need to supply a telephone current to a dedicated telephone, no current is supplied to the voice line, or even if it is supplied, only a small amount of current flows through it.

Problems to be Solved by the Invention However, in the conventional configuration, each device, that is, a device for transmitting voice and control data, a power supply device for passing a DC talking current, etc., has the same configuration for all extension ports. Thus, for example, the power supply capacity for powering the dedicated telephone and the data transmission capacity are all the same. However, there are many cases where, for example, it is desired to install only a certain user's telephone at a large distance from the exchange. In such a case, it would be good if the exchange could improve the power supply capacity and data transmission capacity only for the extension boat, but to do so would complicate the configuration of the exchange and increase costs. I end up.

It is also possible to configure the exchange so that the capacity can be increased for all extension boats, but in this way, even if the power supply capacity is necessary for some extensions, it may be necessary for other extensions. This leads to the provision of unnecessary capabilities, resulting in problems such as an increase in the power consumption of the entire system and a complicated configuration.

The present invention has been made in view of the above-mentioned conventional problems, and provides a telephone relay device that connects between an exchange and a dedicated telephone for an extension boat that requires an extended distance between the dedicated telephone and the telephone. aim at something.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention utilizes the power obtained by separating the DC voltage from the data line in a relay device installed between a dedicated telephone and an exchange. It is designed to be used for operating the data relay means provided in the relay device, and the power obtained by separating the DC voltage from the voice line is supplied to the dedicated telephone set via the data line. It was like this.

Effect: With the above-described configuration, the present invention allows data sent from dedicated telephones and exchanges to be relayed without receiving power from an external power source, and moreover, by utilizing the high DC voltage superimposed on the voice line. Since power can be supplied to the dedicated telephone and voltage drop can be compensated for, it is possible to secure a power supply voltage of a value necessary to operate the dedicated telephone, and therefore the connection distance of the dedicated telephone can be extended.

Embodiment FIG. 1 is a block diagram showing the main functions of a relay device, a telephone set, and a private branch exchange in an embodiment of the present invention.

In FIG. 1, 1'OO is a switchboard, and 300 is a dedicated telephone designed as a dedicated machine for the switchboard 100. In FIG.

The dedicated telephone 300 is equipped with operation keys and information display LEDs, and is configured to provide various services to the user while exchanging various control data with the exchange 100 in addition to normal telephone calls. ing. 200 is a relay device provided between the exchange 100 and the dedicated telephone 300.

In the exchange 100, reference numeral 101 is provided for each extension boat, and a 1'-DC voltage source is provided for bidirectionally transmitting voice signals from telephones and communication path switches, and for applying a DC voltage of about 40 V to the voice line. is a subscriber circuit which is provided with a voltage and is configured to cause a communication current to flow depending on the voltage. The subscriber circuit 101 also has the function of supplying an AC bell signal for ringing. 102 is a power supply circuit.

Reference numeral 105 indicates a voice line consisting of a pair of lines, and 106 indicates a data line consisting of a pair of lines. A DC voltage of 12V appears on the output line of the power supply circuit 102, and the DC voltage is connected to be applied between a pair of data lines 106. In other words, it is configured to supply power to the dedicated telephone 300 by superimposing a DC voltage on the data N106 from the exchange side. Reference numeral 103 denotes a data transmitting/receiving circuit, which transmits control data to the dedicated telephone via the data line 106 and receives control data from the dedicated telephone.

In the relay device 200, 201 is an AC coupling circuit, which blocks the passage of DC current and allows only the AC audio signal to pass. The audio line 105 will be connected to the input terminal of the AC coupling circuit 201. 202 is a power supply circuit. A branch line branched from the audio line 105 before being connected to the AC coupling circuit 201 is connected to the input side of the power supply circuit 202 . The power supply circuit 202 is configured to take out only the DC voltage from the voice 1105 and perform processing such as voltage adjustment on it to provide a 12V power supply DC voltage for the dedicated telephone. Data transmitting/receiving circuits 203 and 204 bidirectionally transmit and receive control data. Further, 205 is a data reproducing circuit that reproduces data bidirectionally. 206 is a power supply circuit, which receives power sent from the exchange 1100 via the data 611106, and uses the power to power the data transmitting/receiving circuit 2.
03 and 204, power is supplied to the data reproducing circuit 205 and the like.

In the dedicated telephone 300, 301 is a communication circuit equipped with an amplifier, an impedance matching unit, etc. for performing voice calls, and 302 is a handset. A data transmitting/receiving circuit 303 is a device for transmitting control data to the exchange and receiving control data from the exchange. A control circuit 304 controls the dedicated telephone.

A power supply circuit 305 supplies power to the dedicated telephone.

FIG. 2 is a block configuration diagram when a standard telephone 300 is connected to the exchange 100. 400 is a standard telephone, 40
Reference numeral 1 denotes a telephone call circuit, and 402 a handset, which allows telephone calls to be made using a standard telephone. Since the standard telephone handset is a carbon microphone, it is necessary to supply the communication current from the subscriber circuit 101 of the exchange 100.

FIG. 3 is a block configuration diagram when a dedicated telephone is connected to the exchange. The configuration of each block is the same as in FIG.

First, the case when a standard telephone is connected to an exchange will be explained based on FIG. Standard telephone 400 and exchange 10
0 is connected only by the audio line 105. Therefore, the data terminal is in an open state, and the power supply circuit 102 and data transmission/reception circuit 103 do not function. Also standard telephone 4
Since the transmitter of the handset 402 of No. 00 is a carbon microphone, the communication current must be supplied from the subscriber circuit 101 of the exchange 100.

Next, the case when a dedicated telephone is connected to the exchange will be explained based on FIG. Dedicated telephone 300 is connected to exchange 10
If connected to 0, audio line 105 and data line 106
Both are used. That is, by connecting the subscriber circuit 101 and the telephone call circuit 301 with the voice line 105, the voice path between the handset 302 and the telephone call path switch is established.

The handset 302 of the dedicated telephone 300 uses an electronic microphone, and the subscriber circuit 10
There is no need to receive communication current supply from 1. Therefore, the communication current is limited in the communication circuit 301. Further, the data transmission/reception circuits 103 and 103 of the exchange 100 and the dedicated telephone 303 are connected via the data line 106.
303 is connected, and control data is exchanged via this data line 106. Further, a DC current is superimposed on the same data line LO6 by the power supply circuit 102, and the power supply circuit 305 uses the superimposed current to connect the dedicated telephone 30.
0.

Next, the case where a relay device is connected to the exchange and the dedicated telephone will be explained based on FIG. 3. The exchange 100 and the relay device 200 have a voice line 105 and a data line 106.
, and the relay device 200 and the dedicated telephone 3
00 is also for audio! +11105 and data line 106.

The voice bus is therefore formed by the handset 302, the AC coupling circuit 201 and the subscriber circuit 101.

The AC coupling circuit 201 allows an AC audio signal to pass through, but is insulated from a DC perspective, and the DC current supplied from the subscriber circuit 101 does not flow into the AC coupling circuit 201 . Therefore, the DC voltage between the two lines of the audio line 105 is applied to the power supply circuit 202, and the DC current supplied from the exchange side is supplied to the power supply circuit 202. The power supply circuit 202 receives power from the exchange in this way, and uses the power to supply power to the data lines of the dedicated telephones 300 of the relay device 200 and to the power supply circuit 305 of the dedicated telephones 300.
Power the dedicated phone via the

On the other hand, control data from the exchange 100 is sent to the relay device 20.
0 and sent to the dedicated telephone 300. That is, the control data sent from the data transmission circuit 103 in the exchange 100 is once received by the data transmission/reception circuit 203 of the relay device 200. The data reproduced by the data reproducing circuit 205 in the relay device 200 is sent out again from the data transmitting/receiving circuit 204 to the dedicated telephone 300.
3 to the control circuit 304.

Further, the control data from the dedicated telephone 300 follows the same route in reverse and reaches the exchange 8100. The power supplied from the power supply circuit 102 through the data line is
Power is supplied to the data transmitting/receiving circuits 203 and 204 and the data reproducing circuit 205 via the power supply circuit 206 in the relay device 200 .

As described above, by relaying control data along the way, it is possible to extend the possible transmission distance for data transmission, and the DC voltage of the voice line, which is higher than the DC voltage of the data line, can be used to connect dedicated telephones. The connection distance between the dedicated telephone and the exchange for power supply can be extended.

Effects of the Invention As described above, in a relay device installed between a dedicated telephone and an exchange, the power obtained by separating the DC voltage from the data line is used to control the operation of the data relay means of the relay device itself. It is designed to be used for
By configuring the system so that the power obtained by separating the DC voltage from the voice line is supplied to the above-mentioned dedicated telephone via the data line, power can be supplied from the dedicated telephone and exchange without a special power supply from an external power source. The data to be sent out will be relayed individually, and the connection distance can be extended without requiring an external power supply for the relay device. Moreover, since it is possible to supply power to a dedicated telephone using the DC voltage superimposed on the voice line, that is, a relatively high voltage of about 40 V for carrying the talking current for a regular telephone, even if the connection distance of the dedicated telephone is shortened, Even if the telephone is extended, it is possible to sufficiently compensate for a drop in the DC voltage for the power supply at the entrance of the dedicated telephone, and the drop in power supply voltage will not cause the telephone to become inoperable. Furthermore, there is no need to make any changes to the exchange side, and standard telephones and dedicated telephones can be accommodated with the same interface configuration.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
The figure shows a block diagram when a standard telephone is connected to an exchange, and FIG. 3 is a block diagram when a dedicated telephone is connected to an exchange. 1. O O: Exchange 101: Subscriber circuit 102; Power supply circuit 103: Data transmission/reception circuit 200
: Relay device 201: AC coupling circuit 202: Power supply circuit 203: Data transmitting/receiving circuit 204: Data transmitting/receiving circuit 205: Data reproducing circuit 300. Dedicated telephone 302: Handset 303: Data transmission/reception circuit 304-control circuit 400: Standard telephone 402: Handset 206: Power supply circuit 301: Call circuit 305: Power supply circuit 401: Call circuit

Claims (1)

[Scope of Claims] A voice line and a data line from an exchange and a telephone are configured to be connectable to each other, and data relaying control data communication carried out between the exchange and an extension telephone via the data line. a power supply device for supplying power sent from the exchange side via the data line for operation of the data relay means; and a power supply device for supplying power sent from the exchange side via the voice line for data use. A telephone relay device characterized by being equipped with a power supply circuit that supplies power to a telephone via a line.