JP2000013826A - Key telephone set provided with function handling power failure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a key telephone set provided with a function against power failure that can use an external ISDN line even on the occurrence of a power failure as well as at application of power of a master set. SOLUTION: This telephone set 40 (50) that is connected to a master set 20 to which an ISDN wire line is connected and is provided with a CPU 41 (51), a master set interface 42 (52), a telephone set section 44 (54) or the like, is provided with an ISDN interface 42B (52B) directly connected to the ISDN wire line. The key telephone set 40 (50) uses the master set interface 42 (52) at application of power to the master set and uses the ISDN interface 42B (52B) on the occurrence of a power failure in the master set. The key telephone set 40 (50) is in operation by a DC power supply from the master set 20 at application of power to the master set and in operation by power with a limit from the 1 ISDN wire line on the occurrence of a power failure in the master set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key telephone with a power failure function, and more particularly, to an ISDN external line, which is connected to a main device operated by an AC power supply, which can be used both when AC power is supplied and during AC power failure, and When the AC is energized, it operates by DC power supply from the main device, and performs external calls and internal calls through the interface of the main device. On the other hand, when the AC power is interrupted, it does not have an auxiliary power device such as a battery and is directly connected. The present invention relates to a key telephone that switches a power supply circuit so as to operate by power supply with limited power from an ISDN external line, changes circuits and controls used for external line transmission and external line incoming call, and operates with power within a limited range.

[0002]

2. Description of the Related Art A telephone is a communication device that is used directly by an unspecified number of people for voice communication. It has a function to send and receive call signals and the like. A key telephone is known as one of telephones. The key telephone accommodates a plurality of ISDN telephone lines, and these lines are shared by extension telephones;
This enables mutual telephone calls between extension telephones. Therefore, the line utilization cost can be reduced, and any extension telephone can supplement the office line, so that a proxy response can be made. A system-type telephone device such as a home telephone or a business telephone, or a key telephone device is capable of transmitting / receiving calls to / from any line from any telephone, holding a line during a call,
This is an apparatus that enables one or more office lines to be used efficiently by a plurality of telephones by a function such as transfer of a call to another telephone.

[0003] As a control method of the system type telephone device,
A system in which a control signal is digitized and processed by a microprocessor is employed. As the wiring method, there are a bus type in which a plurality of telephones are connected on the same cable, a star type in which a main unit individually connects to each telephone, and the like.

An example of a bus system using a key telephone will be described. As shown in FIG. 3, the bus-type system includes a main unit 11, a personal computer 12, a standard telephone 13, a telephone 14 with an answering machine function and a power failure function, a digital cordless telephone handset 15, an answering machine 16 with a color LCD (liquid crystal display) display. , FAX (facsimile) device 17
And a bus 18. The personal computer 12 is connected via a personal computer adapter 121. The digital cordless telephone handset 15 is connected via a digital cordless phone connection device 151. Answering Machine 1 with Color LCD Display
6 uses a video line 161 and is connected via a TV adapter 162 and a color camera door phone 163.
Can be connected. The FAX device 17 is connected via a telephone adapter 171. The bus 18 includes the main device 1
1 and personal computer 12, standard telephone 13, answering machine blackout telephone 14, digital cordless telephone handset 15, color LC
An answering machine 16 with a D display, a facsimile device 17 and the like are connected.

On the other hand, integrated services digital networks (ISDN), which have been recently constructed, are
services digital network). In this ISDN, the voice is 64 kbi
Fully double transmission is performed as a t / s digital code, and a channel for transmitting and receiving signals to and from an exchange is provided independently of a channel for voice transmission. In a digital telephone applied to this communication network, a codec (CODEC) is required for a communication system. However, since a subscriber line is logically formed by a four-wire system, a side protection circuit becomes unnecessary, and a sidetone is prevented. Can be set to an appropriate value in view of call quality.

It has been proposed to use a key telephone in such an ISDN, but it was not possible to use the key telephone at the time of a power failure of the main unit. This is designed so that the basic functions of calling, receiving and talking on the telephone terminal can be operated with the power supplied from the station so that they can be used even during a power outage. When the power supply failed, it could not be used. A conventional ISDN key telephone will be described. As shown in FIG. 4, a conventional ISDN key telephone 30 includes a CPU (central processing unit) 31, a main device interface 32, a POW (voltage monitoring device) 33, and a telephone unit 3.
4, a key matrix 35, a handset 36, and the like. The main device 20 includes a main device control unit 21,
A main unit ISDN interface 22, a time switch 23, a key telephone interface 24 and the like are provided. The CPU 31 controls the entire operation of the key telephone 30. The main device interface 32 is a key telephone 3
0 and the main device 20 are connected. The POW 33 is the main device 2
Power is supplied from 0 through a bus, and a predetermined voltage is supplied to the CPU 31, the telephone unit 34, and the like. The telephone unit 34 executes a call of the key telephone 30 or the like. The key matrix 35 receives a use operation of the user of the key telephone 30 or the like. However, conventional ISDN key telephones 30
However, when the main unit 20 loses power, the functions of the main unit control unit 21 and the like are stopped, so that it is impossible to execute incoming / outgoing calls via the main unit.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the related art, and is a button telephone with a power failure function that can use an ISDN external line both when the main unit is energized and when a power failure occurs. It is to provide.

[0008]

According to the present invention, there is provided a button telephone with a power failure function which is connected to a main unit for connecting an ISDN external line and comprises a CPU, a main unit interface, a telephone unit, etc., and is directly connected to the ISDN external line. This is a button telephone with a power failure function equipped with an ISDN interface.

The present invention uses the main device interface when the main device is energized, and uses the ISD when the main device is out of power.
This is a button telephone with a power failure function using the N interface.

Further, the present invention is a button telephone with a power failure function that operates by DC power supply from the main device when the main device is energized, and performs an external call or an internal call through the main device interface.

Further, the present invention provides a power supply switching means for switching a power supply circuit so as to operate by power supply from an ISDN external line with a limited power supply, and a power failure control in which an additional function is stopped so as to operate with power within a limited range. And a control unit.

Also, the present invention is a button telephone with a power failure function, wherein the connection with the main unit is a bus.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described. An embodiment of the key telephone with a power failure function of the present invention will be described with reference to FIGS. FIG. 1 shows the first embodiment.
FIG. 2 is an explanatory diagram of a circuit of the button telephone with a power failure function of FIG. FIG.
FIG. 9 is an explanatory diagram of a circuit of a key telephone with a power failure function according to a second embodiment. FIG. 3 is an explanatory diagram of a bus type system in which a key telephone with a power failure function is used.

First, an example of a bus type system using the key telephone with a power failure function of the present invention will be described. This bus type system is the same as the conventional example, as shown in FIG. 3, and comprises a main unit 11, a personal computer 12, a standard telephone 13
And a telephone 14 with an answering machine function and a power failure function, a digital cordless telephone handset 15, an answering machine 16 with a color LCD display, a FAX device 17 and the like, and a bus 18. The main device 11 includes a personal computer 12, a standard telephone 13,
Answering machine blackout telephone 14, Digital cordless telephone handset 1
5. An answering machine 16 with a color LCD display, a facsimile device 17 and the like are connected by a bus 18. The personal computer 12 is connected to a bus 18 via a personal computer adapter 13.
The digital cordless telephone handset 15 is connected to the bus 18 via the digital cordless phone connection device 151. The answering machine 16 with a color LCD display can be connected to a bus 18 via a TV adapter 162 and a color camera door phone 163 using a video line 161. FAX device 17 is a telephone adapter 171
Is connected to the bus 18 via the.

Embodiment 1 will be described. The button telephone 40 with a power failure function according to the present embodiment is used in such a bus type system, and as shown in FIG. 1, the CPU 41 for energizing, the main device interface 42, the POW 43 for energizing, and the telephone unit 44 for energizing. , Power supply key matrix 45, handset 46, etc., power failure CPU 41B, ISDN
An interface 42B, a power failure POW 43B, a power failure telephone unit 44B, a power failure key matrix 45B, a switch 47, and the like are provided. Also, the main device 20
As in the conventional example, the main unit control unit 21 and the main unit ISD
An N interface 22, a time switch 23, a key telephone interface 24 and the like are provided. Power-on CPU 41, main device interface 42, power-on PO
W43, power-on telephone unit 44, power-on key matrix 45, etc. are the same as in the prior art,
41B controls the operation of the key telephone 40 during a power failure. The ISDN interface 42B is directly connected to an ISDN external line and is used at the time of a power failure. The power outage POW 43B supplies a voltage to the power outage CPU 41B, the power outage telephone unit 44B, and the like by power-limited power supply from an ISDN outside line at the time of power outage. Telephone unit for power failure 44B
Executes the call function of the key telephone 40 at the time of power failure.
The power failure key matrix 45B receives a use operation of the user of the key telephone 40 during a power failure. The switch 47 switches so as to select the power supply telephone unit 44B when power is supplied, but to select the power supply telephone unit 44B during power failure. As a result, the key telephone 40 with a power failure function according to the present embodiment can perform transmission and reception using an ISDN external line not only at the time of power supply but also at the time of power failure. Although the CPUs at the time of energization and at the time of a power failure have been described as separate CPUs 41 and 41B, they can be executed by being incorporated into one CPU. As a result, the button telephone 40 with a power failure function of the present embodiment switches the power supply circuit to operate by power supply with limited power from the ISDN outside line, stops the additional functions, and controls to operate with the power within the limited range. Therefore, the ISDN external line can be used both at the time of power supply and at the time of power failure.

A second embodiment will be described. As shown in FIG. 2, the key telephone 50 with a power failure function according to the present embodiment has a shared CPU.
51, main device interface 52, power supply separation circuit 58,
The POW 53 for power supply, the POW 53B for power failure, the POW detection device 59, the common telephone unit 54, the common key matrix 55, and the handset 56 are provided. Further, the main device 20 includes a main device control unit 21, a main device ISDN interface 22, a time switch 23, a key telephone interface 24, and the like, similarly to the multiple examples and the first embodiment. The POW detection device 59 monitors the bus voltage, and when the supply voltage from the main device 20 is a predetermined value, for example, 24 V or more, the power-on POW
The power supply 53 is operated to stop the operation of the power failure POW 53B. On the other hand, when it is less than the predetermined value, the power failure PO
The W53B is operated to stop the operation of the power-on POW 53. The common CPU 51, the common telephone unit 54, and the common key matrix 55 are used both when power is supplied and when a power failure occurs. The power supply separation circuit 58 and the POW detection device 59 are used in comparison with the button telephone 40 with a power failure function of the first embodiment, but the common CPU 51, the common telephone unit 54, the common key matrix 55, etc. Used,
And the switch 47 is unnecessary. POW detector 5
9 determines when the main unit 20 is energized and when there is a power outage, and
This is possible because the power-on POW 53 or the power-off POW 53B is selected. According to this embodiment, the power supply separation circuit 58 and the POW detection device 59 are required, but only one common CPU 51, common telephone unit 54, and common key matrix 55 may be prepared. As a result, the key telephone 50 with a power failure function of the present embodiment switches the power supply circuit so as to operate by power supply with limited power from the ISDN outside line, stops the additional functions, and controls to operate with power within the limited range. Therefore, the ISDN external line can be used both at the time of power supply and at the time of power failure.

[0017]

According to the present invention, it is possible to obtain a key telephone with a power failure function that can use an ISDN outside line both when the main unit is energized and when a power failure occurs.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a circuit of a key telephone with a power failure function according to a first embodiment.

FIG. 2 is an explanatory diagram of a circuit of a key telephone with a power failure function according to a second embodiment.

FIG. 3 is an explanatory diagram of an example of a bus system in which a button telephone with a power failure function is used.

FIG. 4 is an explanatory diagram of a circuit of a conventional button telephone with a power failure function.

[Explanation of symbols]

Reference Signs List 11 Main device 12 Personal computer 121 Personal computer adapter 13 Standard telephone 14 Telephone with answering machine function and power failure function 15 Digital cordless telephone handset 151 Digital cordless phone connection device 16 Answering machine with color LCD display 161 Video line 162 TV adapter 163 Color camera door phone 17 FAX device 171 Telephone adapter 18 Bus 20 Main device 21 Main device control unit 22 Main device ISDN interface 23 Time switch 24 Button telephone interface 40, 50 Button telephone with power failure function 41 Power-on CPU 41B CPU for power failure 42, 52 Main device Interfaces 42B, 52B ISDN interfaces for button telephones 43, 53 POW 43B, 53B for power-on POW 44 for power-off 44 Telephone unit for power-on 44 Schema for the time the key matrix 45B outage for the time when a telephone unit 45 energized blackout trick 46,56 handset 47 switch 51 shared CPU 54 shared telephone unit 55 shared key matrix 58 power separation circuit 59 POW detector

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hirokazu Soezuka 24-4 Sakuragaoka-cho, Shibuya-ku, Tokyo Inside Nakayo Communication Aircraft Co., Ltd. (72) Kazuo Kitamura 3-9-1-2 Nishishinjuku, Shinjuku-ku, Tokyo No. Nippon Telegraph and Telephone Corporation (72) Takashi Matsumoto 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Nippon Telegraph and Telephone Corporation (72) Seiji Matsunami 3--19, Nishishinjuku, Shinjuku-ku, Tokyo 2 Nippon Telegraph and Telephone Corporation F-term (reference) 5K027 AA03 BB06 CC02 GG02 5K049 AA05 AA09 BB02 CC13 EE17 FF01 FF52

Claims (5)

[Claims] 1. A button telephone with a power failure function, which is connected to a main unit for connecting an ISDN external line and includes a CPU, a main unit interface, a telephone unit, etc., characterized by comprising an ISDN interface directly connected to the ISDN external line. Button telephone with power failure function. 2. The button telephone with a power failure function according to claim 1, wherein the main device interface is used when the main device is turned on, and the ISDN interface is used when the main device is turned off. Phone. 3. The key telephone set with a power failure function according to claim 1, wherein when the main unit is energized, the main unit operates by DC power supply, and performs an external call or an internal call through the main unit interface. Button telephone with power failure function. 4. The key telephone set with a power failure function according to claim 1, further comprising: a power supply switching unit that switches a power supply circuit so as to operate by power supply with limited power from an ISDN external line; and an additional function. And a power outage control means for stopping the power and controlling to operate with power within a limited range. 5. The button telephone with a power failure function according to claim 1, wherein the connection with the main unit is a bus.