JPH07236012A - Telephone device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a telephone device that is economically advantageous by preventing unnecessary power consumption. [Structure] -24V power is supplied from a power supply unit 2 via a -24V line 141 to a single terminal interface unit 41-41.
It supplies to DC / DC converter 413 and DC / DC converter 513 in 4m and outside line interface units 51-5n, and these DC / DC converter 413
Further, the DC / DC converter 513 boosts the -24V power source to -48V, and supplies the -4VV power source to the independent terminal interface circuit 411 and the external line interface circuit 511 for use as a power source.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone device having a power source with a small capacity.

[0002]

2. Description of the Related Art Among conventional telephone devices, digital key telephone devices include those that can use general standard telephone terminals in addition to key telephone terminals. As a conventional digital key telephone device, there is one having a configuration as shown in FIG. In this case, the digital button telephone device B is composed of a main device 1b, a standard telephone terminal 6b1 connected to the main device 1b, digital button telephone terminals 6b2 to 6bm, and office lines 8b1 to 8bn.

The main device 1b is a digital key telephone device B.
A control unit 10b that controls the entire system, and a power supply unit 2b that supplies power to each unit in the digital key telephone device B.
And the control unit 10b has a control data highway 1
It is connected to the exchange circuit 9b and the storage unit 11b via 3b. The control data highway 13b has a single terminal interface unit 3b1 to which the standard telephone terminal 6b1 is connected and dedicated terminal interface units 3b2 to 3 to which the digital key telephone terminals 6b2 to 6bm are connected.
bm and external line interface units 5b1 to 5bn to which the office lines 8b1 to 8bn are connected.

Further, the exchange circuit 9b is provided with a single terminal interface unit 3b1 by a PCM highway 12b.
The dedicated terminal interface units 3b2-3bm and the external line interface units 5b1-5bn are connected.

The power supply unit 2b has a power supply voltage of -48.
V, -24V, -5V, and + 5V are generated respectively, and -48V line 141b, -24V line 142b, -5V are generated.
The power supply bus 14b including the line 143b, the + 5V line 144b, and the GND line 145b is connected. The independent terminal interface unit 3b1 is connected to the −48V line 141b and the GND line 145b in the power supply bus 14b, and the dedicated terminal interface units 3b2 to 3bm are connected to the −24V line 142b and the GND line 14 in the power supply bus 14b.
5b, the external line interface units 5b1 to 5bn are connected to the -48V line 141b and the GND line 145b, respectively.

By the way, in such a conventional digital key telephone device, in order to avoid the harmful effects of high voltage, such as the prevention of electric shock accidents and the prevention of insulation failure accidents, the power supply bus 14b is used in the power supply bus 14b as described above. The -24V line 142b is connected to the dedicated terminal interface units 3b2-3bm, and the digital key telephone terminal 6b is connected.
-24V voltage is used as the main power source of the system, such as driving 2 to 6 bm.

[0007]

However, the use of the -24V voltage as the main power source means that when the single terminal interface unit 3b1 and the external line interface units 5b1 to 5bn using -48V are used,
It is necessary to purposely generate the -48V voltage for operating the single terminal interface unit 3b1 and the external line interface units 5b1 to 5bn.

In this case, the outside line interface unit 5
Although b1 to 5bn are predetermined depending on the number of office lines, it is possible to use a large number of standard telephones 6b1 in the future for the single terminal interface unit 3b1, and this must be anticipated.

Therefore, the power supply unit 2b must be prepared in advance with a large current capacity, assuming the maximum number of single terminal interface units 3b1 and the like to be used.

That is, in the conventional device, from -24V to-
Since 48 V is centrally generated by the power supply unit 2b, a power supply unit 2b must always have a large current capacity in order to generate −48 V power supply, which causes excessive and extra power consumption. There has been a problem that the person bears useless expenses. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a telephone device that can prevent wasteful power consumption and can be economically advantageous.

[0011]

SUMMARY OF THE INVENTION The present invention provides a telephone device having a plurality of terminals having different driving voltages and a terminal interface section provided corresponding to the plurality of terminals, which is driven by a low voltage among the plurality of terminals. Main power supply means for collectively supplying the power required for the terminal interface section corresponding to the terminal and the terminal interface section corresponding to the terminal driven by a high voltage among the plurality of terminals, respectively. The main power supply means comprises a power supply generating means for generating power to be supplied to each of the terminal interface sections.

The present invention, in a telephone device having a plurality of terminals having different driving voltages and a terminal interface section provided corresponding to the plurality of terminals, corresponds to a terminal driven at a low voltage among the plurality of terminals. Main power supply means for collectively supplying power required for the terminal interface section, and a plurality of terminal interface sections corresponding to terminals driven by high voltage among the plurality of terminals are provided for each of the plurality of terminals. The power supply generating means for generating the power supplied to the interface section from the low voltage source of the main power supply means.

According to the present invention, in a telephone device having a telephone terminal interface section for connecting a plurality of telephone terminals having different driving voltages and an outside line interface section for connecting an outside line, the telephone apparatus is driven at a low voltage among the plurality of telephone terminals. Main power supply means for collectively supplying power required for a telephone terminal interface unit corresponding to the telephone terminal, a telephone terminal interface unit corresponding to a telephone terminal driven at high voltage among the plurality of telephone terminals, and the above Each of the external line interface units is provided with a separate power supply generating unit that generates the power required for the telephone terminal interface unit and the external line interface unit from a low voltage source supplied from the main power supply unit.

[0014]

As a result, according to the present invention, in a telephone device having a plurality of terminals having different driving voltages and a terminal interface section provided corresponding to the plurality of terminals, the telephone device is driven at a low voltage among the plurality of terminals. The power required for the terminal interface section corresponding to the terminal is collectively supplied by the main power source means, and the power is supplied to the terminal interface section corresponding to the terminal driven by a high voltage among the plurality of terminals. Is generated from the low-voltage source of the main power supply means in the power supply generation means individually provided in the terminal interface unit. Therefore, in a telephone terminal other than the telephone terminal driven by the low voltage from the main power supply means. It is not necessary to supply the power required by the interface section.

According to the present invention, in a telephone device having a plurality of terminals having different driving voltages and a terminal interface section provided corresponding to the plurality of terminals, the terminal driven by a low voltage among the plurality of terminals is used. The main power supply means collectively supplies the power required for the corresponding terminal interface unit, and the power supplied to the terminal interface unit corresponding to the terminal driven by a high voltage among the plurality of terminals is Since the power generation means provided for each of the plurality of terminal interface units generates power from the low-voltage source of the main power supply means, it can be used for telephone terminals other than telephone terminals driven by the low voltage from the main power supply means. It is not necessary to supply the power required by the interface section.

According to the present invention, in a telephone device having a telephone terminal interface section for connecting a plurality of telephone terminals having different driving voltages and an outside line interface section for connecting an outside line, a low voltage of the plurality of telephone terminals is used. A telephone corresponding to a telephone terminal driven by a high voltage among the plurality of telephone terminals, which collectively supplies power required for a telephone terminal interface unit corresponding to the driven telephone terminal by a main power supply means. Electric power required for the terminal interface unit and the external line interface unit is generated from the low voltage source supplied from the main power source unit in the power supply generation unit separately provided for the telephone terminal interface unit and the external line interface unit. Therefore, the telephone terminal interface corresponding to the telephone terminal driven by a voltage higher than the main power supply means Necessary to supply power required each face portion or the external line interface unit is eliminated.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the digital key telephone device A of this embodiment. In FIG. 1, a digital button telephone device A is composed of a main device 1, a plurality of digital button telephone terminals 61 to 61 connected to the main device 1, standard telephone terminals 71 to 7m, and office lines 81 to 8n. There is.

The main unit 1 includes a control unit 10, a storage unit 11, an exchange circuit 9, and dedicated terminal interface units 31 to 31.
1, a single terminal interface unit 41 to 4m, an external line interface unit 51 to 5n, and a power supply unit 2. The control unit 10 performs overall control of the digital key telephone device A, and the switching circuit 9 and the storage unit 11 are connected via a control data highway 13 for transmitting and receiving control data signals. The control data highway 13 includes dedicated terminal interface units 31 to 31 and individual terminal interface units 41 to 41.
4m and external line interface units 51 to 5n are connected.

To the exchange circuit 9, dedicated terminal interface units 31 to 31, individual terminal interface units 41 to 4m, and external line interface units 51 to 5n are connected via a PCM highway 12 for transmitting and receiving PCM data signals.

Here, the exchange circuit 9 is configured to perform an exchange operation between the dedicated terminal interface units 31 to 31l or the individual terminal interface units 41 to 4m and the outside line interface units 51 to 5n according to a control command from the control unit 10. ing.

Dedicated terminal interface units 31 to 3
The digital button telephone terminals 61 to 61 are connected to the digital button telephone terminals 61 to 61, respectively.
And the digital key telephone device A. Single terminal interface unit 41
4 m connect standard telephone terminals 71 to 7 m and form an interface function between the standard telephone terminals 71 to 7 m and the digital button telephone apparatus A. And
The outside line interface units 51 to 5n are connected to the office lines 81 to 8n, respectively, and serve as an interface between the office lines 81 to 8n and the digital button telephone apparatus A.

The power supply unit 2 is -2 as a power supply voltage for supplying power to each section in the digital key telephone device A.
Generates 4V, -5V, + 5V. -24V line 14
1, -5V line 142, + 5V line 143, GND line 144
Is connected to the power bus 14.

Dedicated terminal interface units 31 to 31 and individual terminal interface units 41 to 4
m and the external line interface units 51 to 5n, the -24V line 141 and the GN in the power supply bus 14 are respectively provided.
The D line 144 is connected.

The power supply unit 2 includes a 100V / -24V converter 21, a -24V / -5V converter 22, and a -24V / +.
A power cord 25 for obtaining a 100V power source from a commercial power source is composed of a 5V converter 23
It is connected to the 0V / -24V conversion unit 21. And 1
The 00V / -24V conversion unit 21 is -24 of the power supply bus 14.
V line 141, -24V / -5V conversion unit 22, and -2
It is connected to the 4V / + 5V conversion unit 23. Furthermore -2
The 4V / -5V conversion unit 22 includes the -5V line 14 of the power supply bus 14.
2 and the -24V / + 5V converter 23 is connected to the + 5V line 143 of the power supply bus 14.

Here, the 100V / -24V conversion unit 21 generates -24V from 100V, the -24V / -5V conversion unit 22 generates -24V to -5V, and -24V / + 5.
The V converter 23 generates + 5V from -24V,
Each consists of a DC / DC converter.

The -24V line 141 and the GND line 144 in the power bus 14 are connected to the dedicated terminal interface unit 31.
~ 3l, individual terminal interface units 41-4m,
And the connection to the outside line interface units 51 to 5n is as described above.

On the other hand, the dedicated terminal interface unit 3
1 to 3l have a dedicated terminal interface circuit 311 and a dedicated terminal interface control circuit 312. The -24V line 141 and the dedicated terminal interface control circuit 312 are connected to the dedicated terminal interface circuit 311, the GND line 144 is connected to the dedicated terminal interface units 31 to 31, and the dedicated terminal interface circuit 311 is connected to the main device. 1. Digital button telephone terminals 61 to 61 are connected to the outside.

Here, the dedicated terminal interface control circuit 312 controls the operation of the dedicated terminal interface circuit 311. Single terminal interface unit 41-4m
Has a single terminal interface circuit 411, a single terminal interface control circuit 412, and a DC / DC converter 413. In this case, the −24V line 141 is connected to the DC / DC converter 413, and the GND line 144 is connected to the individual terminal interface units 41 to 4m. Further, the DC / DC converter 413 and the independent terminal interface control circuit 412 are connected to the independent terminal interface circuit 411,
Standard telephone terminals 71 to 7m are connected to the outside of the main device 1 in the independent terminal interface circuit 411.

Here, the single terminal interface control circuit 412 controls the operation of the single terminal interface circuit 411. The DC / DC converter 413 is composed of a switching regulator, and is -24V of the power supply bus 14.
If a voltage of -24V is applied from the line 141, -24V
/ -48V conversion is performed, and -48V power is supplied to the single terminal interface circuit 411.

Also, the outside line interface units 51 to 51
5n is an outside line interface circuit 511, an outside line interface control circuit 512, and a DC / DC converter 5
Have 13. In this case, the -24V line 141 is DC
/ DC converter 513 and G
The ND line 144 is the outside line interface unit 51-5n
It is connected to the. Furthermore, the DC / DC converter 513
And the outside line interface control circuit 512 are connected to the outside line interface circuit 511, and the outside line interface circuit 511 is connected to the external lines 81 to 8n outside the main unit 1.

Here, the outside line interface control circuit 51
Reference numeral 2 controls the operation of the outside line interface circuit 511. The DC / DC converter 513 is composed of a switching regulator. When a voltage of -24V is applied from the -24V line of the power supply bus 14, the DC / DC converter 513 performs -24V / -48V conversion, and the external line interface circuit 511 receives -48V.
Power supply.

FIG. 2 is a block diagram showing the configuration of the single terminal interface units 41 to 4m for the standard telephone terminals 71 to 7m. In this case, the single terminal interface unit 41 has a single terminal interface circuit 411, a single terminal interface control circuit 412, and a DC / DC converter 413. In the independent terminal interface circuit 411, 421 indicates a codec section, and this codec section 421 is a 2-wire / 4-wire conversion circuit 4
22 is connected.

The 2-wire / 4-wire conversion circuit 422 is a transformer 42.
3 is connected to one winding of the transformer 423, and the other winding of the transformer 423 is connected to the constant current feeding circuit 426 via the capacitor 424 and the constant current feeding circuit 42 via the capacitor 425.
7 are connected respectively. The constant current feeding circuits 426 and 427 are connected to the DC / DC converter 413.

Further, the capacitor 424 is a switch 429.
, And the capacitor 425 is connected to the fixed piece in the switch 430. Then, the fixed piece in the switch 429 and the fixed piece in the switch 430 have the ringer signal generator 42 with these as ends.
8, the standard telephone terminal 71 is connected to the movable piece of the switch 429 and the movable piece of the switch 430.

Here, the DC / DC converter 413 comprises a switching regulator, and the power supply bus 14
Connected to -24V line 141 and GND line 144 of
4V / -48V conversion is performed.

The codec section 421 is a PCM highway 1
The PCM decoding of the reception signal sent from 2 is performed, and the PCM coding of the transmission signal sent from the 2-line to 4-line conversion circuit 422 is performed. The movable pieces of the switch 429 and the switch 430 are in contact with the fixed pieces of the capacitors 424 and 425, respectively, in the incoming call waiting state or the talking state, but when the incoming call is received, they are fixed on the ringer signal generator 428 side. And the standard telephone terminal 71 is switched by the ringer signal generator 428.
Is trying to generate a ringtone.

The codec section 421 is connected to the PCM highway 12 and is also connected to the independent terminal interface control circuit 412. The single terminal interface control circuit 412 controls the operation of the single terminal interface 411, and is connected to the control data highway 13.

Next, the operation of the key telephone device A configured as above will be described with reference to FIGS. 1 and 2. During operation of the digital key telephone device A, the 100V power supplied from the power cord 25 in the power supply unit 2 is transferred to the 100V / -24V conversion unit 21 via the transformer 24.
Converted to 24V. Then, the power supply converted to -24V is supplied from the 100V / -24V conversion unit 21 to the power supply bus 1
4 -24V line 141 and -24V / -5V converter 22,
And −24V / + 5V converter 23.

In the -24V / -5V conversion section 22, -24V
When the power source of V is received, it is converted to -5V, and the power source converted to -5V is output to the -5V line 142 of the power source bus 14. Further, when the -24V / + 5V conversion unit 23 also receives the power of -24V, it converts it to + 5V, and outputs the power converted to + 5V to the + 5V line 143 of the power supply bus 14.

The -24V power supplied from the power supply unit 2 via the power supply bus 14 is the DC / DC converter 41 of the individual terminal interface units 41 to 4m.
3 is supplied.

-24V supplied to the DC / DC converter 413 is boosted by the switching operation to -48V.
It is converted and supplied to the constant current feeding circuits 426 and 427 of the single terminal interface circuit 411.

Similarly, the outside line interface unit 51
Also in 5n, the -24V power supplied from the power supply unit 2 via the power supply bus 14 is supplied to the DC / DC converters 513 of the external line interface units 51-5n.

Then, the -24V power supply supplied to the DC / DC converter 513 is boosted by the switching operation and converted to -48V, and the external line interface circuit 51.
1 is supplied.

From this state, the digital key telephone system A
When the outside line interface control circuit 512 detects an incoming call through the outside line interface circuit 511, the outside line interface control circuit 512 informs the control unit 10 that the control data highway 13 indicates that there is an incoming call through the station line 81. Notify via.

When the control unit 10 receives the extension number of the incoming digital key telephone apparatus A from the outside line interface control circuit 512, the extension number and the storage unit 11 are received.
The extension number stored in (1) is collated, and the extension telephone terminal (standard telephone terminal 71 in this embodiment) corresponding to the extension number is detected.

Next, the control unit 10 notifies the single terminal interface control circuit 412 of the single terminal interface unit 41 via the control data highway 13 that there is an incoming call.

Then, the independent terminal interface control circuit 4
12 is a codec unit 421, a two-wire four-wire conversion circuit 42
2, the movable piece in the switch 429 and the movable piece in the switch 430 through the transformer 423, the condenser 424, and the condenser 425, respectively.
By switching from the side, the condenser 425 side to the ringer signal generator 428 side, the ringer signal generator 428 causes the standard telephone terminal 71 to generate a ring tone.

Subsequently, when the user of the standard telephone terminal 71 who listens to the ring tone picks up the handset in the standard telephone terminal 71, the movable piece in the switch 429 and the movable piece in the switch 430 are respectively moved from the ringer signal generator 428 side. It is switched to the condenser 424 side and the condenser 425 side. Then, the independent terminal interface control circuit 412 sends it to the capacitors 424 and 425, the transformer 423, the two-wire to four-wire conversion circuit 422,
Detected as off-hook via the codec section 421,
To that effect, the control unit 10 via the control data highway 13
To notify.

When the control unit 10 receives the off-hook notification in the standard telephone terminal 71, the PCM highway 1
The communication path of the single terminal interface unit 41 and the external line interface unit 51 in 2 is formed by the switching circuit 9.

When the communication path between the independent terminal interface unit 41 and the outside line interface unit 51 is formed, an analog voice signal from the office line 81 is transmitted to the outside line interface circuit 51 in the outside line interface unit 51.
1 is received and is PCM encoded, and the PCM voice signal is sent to the single terminal interface circuit 411 in the single terminal interface unit 41 via the PCM highway 12.

PC from outside line interface circuit 511
When the codec unit 421 in the single terminal interface circuit 411 receives the M audio signal, the single terminal interface control circuit 412 PCM-decodes the PCM audio signal in the codec unit 421, and converts the analog audio signal into the 2-wire 4-wire conversion circuit 422. send.

Next, in the 2-wire / 4-wire conversion circuit 422, the received analog audio signal is converted into 4-wire / 2-wire, and the analog signal is converted into a transformer 423, a capacitor 424 and a capacitor 425, a switch 429 and a switch 43.
0 to the standard telephone terminal 71, and the standard telephone terminal 71
Received voice is output from the handset in.

On the other hand, in the case of the voice transmission from the standard telephone terminal 71, when the voice of the user is input from the transmitter of the standard telephone terminal 71, the analog signal is the switch 429 and the switch 430, the condenser 424 and the condenser 425. , 4-wire conversion circuit 4 via the transformer 423
Sent to 22.

Next, the 2-line to 4-line conversion circuit 422 converts the received analog voice signal into 2-line / 4-line and sends the analog signal to the codec section 421. Then, in the codec unit 421, the received analog signal is sent to the PC.
M-encoded the PCM audio signal to PCM highway 1
Output to 2.

After that, the PCM voice signal is appropriately processed in the outside line interface unit 51, and the office line 8
The process output to 1 is a process that is the reverse of the case of the above-described reception, and the description thereof will be omitted.

Therefore, according to such an embodiment, the -24V power is supplied from the power supply unit 2 via the -24V line 141 to the DC / D in the individual terminal interface units 41 to 4m and the external line interface units 51 to 5n.
The C / DC converter 413 and the DC / DC converter 513 are supplied to the DC / DC converter 413 and the DC / DC converter 413.
DC converter 513 supplies -24V power to -48V
Since the -48V power source is supplied to the independent terminal interface circuit 411 and the external line interface circuit 511 to be used as a power source, it is not necessary to equip the power source unit 2 with the -48V power source, and the corresponding size is required. Since it is not necessary to always have a current capacity of 1, the excess power consumption can be eliminated, and unnecessary costs can be reduced for the user.

The present invention is not limited to the above-mentioned embodiments, but can be modified and implemented as appropriate without departing from the scope of the invention.
For example, in the above embodiment, the DC / DC converter 41 is provided in each of the individual terminal interface units 41 to 4m and the outside line interface units 51 to 5n.
However, it is also possible to collect a single terminal interface unit and an external line interface unit into a plurality, and to respectively provide a DC / DC converter for each of these plurality.

Further, in the above-mentioned embodiment, the example in which the external line interface unit is provided in addition to the single terminal interface unit has been described, but the present invention can be applied to the case where the external line interface unit is not provided.

[0059]

According to the present invention, in a telephone device having a plurality of terminals having different driving voltages and a terminal interface portion provided corresponding to the plurality of terminals, the telephone device is driven at a low voltage among the plurality of terminals. The power required for the terminal interface unit corresponding to the terminal is collectively supplied by the main power supply means, and the power is supplied to the terminal interface unit corresponding to the terminal driven by a high voltage among the plurality of terminals. Since the power supply generation means individually provided in the terminal interface section generates the power from the low voltage source of the main power supply means, the interface of the telephone terminal other than the telephone terminal driven by the low voltage from the main power supply means. It is no longer necessary to supply the electric power required by the parts, which eliminates the need for a correspondingly large current capacity, It is possible to eliminate the extra power consumption, can reduce unnecessary costs for the user.

According to the present invention, in a telephone device having a plurality of terminals having different driving voltages and a terminal interface section provided corresponding to the plurality of terminals, one of the plurality of terminals which is driven at a low voltage is used. The main power supply means collectively supplies the power required for the corresponding terminal interface unit, and the power supplied to the terminal interface unit corresponding to the terminal driven by a high voltage among the plurality of terminals is Since the power generation means provided for each of the plurality of terminal interface units generates power from the low-voltage source of the main power supply means, it can be used for telephone terminals other than telephone terminals driven by the low voltage from the main power supply means. There is no need to supply the power required by the interface section,
As a result, it is not necessary to always have a correspondingly large current capacity, and it is possible to eliminate excessive extra power consumption and reduce unnecessary costs for the user.

According to the present invention, in a telephone device having a telephone terminal interface section for connecting a plurality of telephone terminals having different driving voltages and an outside line interface section for connecting an outside line, a low voltage of the plurality of telephone terminals is used. A telephone corresponding to a telephone terminal driven by a high voltage among the plurality of telephone terminals, which collectively supplies power required for a telephone terminal interface unit corresponding to the driven telephone terminal by a main power supply means. Electric power required for the terminal interface unit and the external line interface unit is generated from the low voltage source supplied from the main power source unit in the power supply generation unit separately provided for the telephone terminal interface unit and the external line interface unit. Therefore, the main power supply means is driven by a high voltage except for the telephone terminal which is driven by the low voltage. It is no longer necessary to supply the required power to the telephone terminal interface unit corresponding to the telephone terminal or the external line interface unit, thereby eliminating the need to constantly maintain a correspondingly large current capacity, and to avoid excessive excess capacity. It is possible to eliminate the power consumption of the device and reduce unnecessary costs for the user.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a digital key telephone device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of a single terminal interface unit of the digital key telephone device in one embodiment.

FIG. 3 is a block diagram showing a configuration of a digital key telephone device in a conventional example.

[Explanation of symbols]

A ... Digital key telephone device, 1 ... Main device, 2 ... Power supply unit, 21 ... 100V / -24V converter, 22 ...- 2
4V / -5V converter, 23 ...- 24V / + 5V converter,
24 ... Transformer, 25 ... Power cord, 31-3 l ... Dedicated terminal interface unit, 311 ... Dedicated terminal interface circuit, 312 ... Dedicated terminal interface control circuit, 41-4 m ... Single terminal interface unit, 4
11 ... Single terminal interface circuit, 412 ... Single terminal interface control circuit, 413 ... DC / DC converter, 51-5n ... External line interface unit, 511
External line interface circuit 512 External line interface control circuit 513 DC / DC converter 61 to 6
l ... Digital button telephone terminal, 71-7m ... Standard telephone terminal, 81-8n ... Station line, 9 ... Switching circuit, 10 ... Control section,
11 ... Storage unit, 12 ... PCM highway, 13 ... Control data highway, 14 ... Power bus, 141 ... -24V
Line, 142 ...- 5V line, 143 ... + 5V line, 144 ... G
ND line, 421 ... Codec section, 422 ... 2-line / four-line conversion circuit, 423 ... Transformer, 424 ... Capacitor, 425
... Capacitor, 426 ... Constant current feeding circuit, 427 ... Constant current feeding circuit, 428 ... Ringer signal generator, 429 ... Switch, 430 ... Switch, B ... Digital button telephone device.

Claims (3)

[Claims] 1. A telephone device having a plurality of terminals having different driving voltages and a terminal interface section provided corresponding to the plurality of terminals, wherein a terminal interface corresponding to a terminal driven at a low voltage among the plurality of terminals. Main power supply means for collectively supplying necessary power to the parts, and a terminal interface part corresponding to a terminal driven by a high voltage among the plurality of terminals, respectively, and respectively supplied to these terminal interface parts. And a power supply generating means for generating a power supply to be generated from the low voltage source of the main power supply means. 2. A telephone device having a plurality of terminals having different driving voltages and a terminal interface section provided corresponding to the plurality of terminals, wherein a terminal interface corresponding to a terminal driven at a low voltage among the plurality of terminals. A main power supply unit for collectively supplying necessary power to the unit, and a plurality of terminal interface units corresponding to terminals driven by a high voltage among the plurality of terminals. And a power supply generation means for generating power to be supplied to each of the main power supply means from the low voltage source. 3. A telephone device having a telephone terminal interface section for connecting a plurality of telephone terminals having different drive voltages and an outside line interface section for connecting an outside line, wherein the telephone terminal is driven at a low voltage among the plurality of telephone terminals. Main power supply means for collectively supplying power required for a telephone terminal interface unit corresponding to the above, a telephone terminal interface unit corresponding to a telephone terminal driven at high voltage among the plurality of telephone terminals, and the outside line interface. A telephone device characterized in that it is provided with a power supply generation means which is separately provided in each section and generates the power required for the telephone terminal interface section and the external line interface section from a low voltage source supplied from the main power source means. .