JPH05176066A - Private automatic exchange - Google Patents

Abstract

PURPOSE:To enable the outside line outgoing from a radio telephone set at the time of a fault or power failure by shifting to the connection frequency band to the public network using the radio telephone set and making the outside line outgoing and later. CONSTITUTION:In case of abnormal data transfer, a control unit 23 counts the number of failures, and when it becomes more than consecutive (n)-times, the private automatic exchange is judged to be troubled or turned off. The incoming/outgoing control and later is not performed through the private automatic exchange, the switch 12 switches the channel to a voice channel control section 11 associated with the control from the private frequency zone to the public frequency zone, and the LED of a key scanning section 22 shows the private frequency zone is not available. Further, in case a fault in reception data, the switch 12 switches the channel to the voice channel control section 11 associated with the public network frequency band. In case of the fault and power failure of the private automatic exchange or a fault in the received data, the outside line outgoing from the radio telephone set through the public network is enabled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private automatic branch exchange to which a wireless telephone using a private radio frequency band and a public network frequency band is connected.

[0002]

2. Description of the Related Art Regarding a wireless telephone connected to a private automatic branch exchange, the structure of a conventional wireless telephone will be described with reference to the drawings.

FIG. 7 is a block diagram showing the concept of a wireless telephone connected to a conventional private automatic branch exchange. Reference numeral 1 is a wireless transmission / reception unit that transmits and receives radio waves in the local frequency band, 2 is a local audio frequency band voice path control unit that performs interface control of the audio path, 3 is a compander that removes noise in the wireless system, and 4 is a private branch exchange (Fig. (Not shown) and a control data converting modem for performing D-A conversion of control data between the wireless telephone, 5 a speaker for transmitting a received voice, 6 a microphone as an input unit of the transmitted voice, and 7 an antenna for a local frequency band. , 8 is a key operation unit that enables key input on the wireless telephone, and 9 is a control unit that determines the key pressed on the key operation unit and logically controls the control data received from the modem 4. is there.

The operation of the radio telephone connected to the conventional private automatic branch exchange constructed as described above will be described below. When making a call from the wireless telephone, the user inputs a key from the key operation unit 8 on the wireless telephone. Control unit 9
When the key is received, the control section 9 informs the control data that the wireless transmission / reception section 1 will make a call to the private automatic branch exchange via the modem 4. After that, transmission control is performed via the wireless transmission / reception unit 1 according to the dial continuously input from the key operation unit 8.

[0005]

However, in the above-mentioned conventional method, when the radio telephone cannot be used when radio wave transmission / reception to / from the private automatic exchange main unit becomes impossible, particularly when the private automatic exchange main unit suffers a failure or a power failure. The call origination / receipt operation from the wireless telephone was completely stopped.
In addition, if there is a failure in the outside line connected to the private branch exchange, there is no means for dealing with it, and even the minimum outside line transmission required when the private branch exchange main unit fails is not guaranteed. However, there is a problem that serviceability is remarkably deteriorated because it becomes impossible to make an outside line.

The present invention has been made to solve the above-mentioned conventional problems, and has a private branch exchange main body and a private branch exchange means for sending and receiving a call from a wireless telephone via a public network when a failure occurs in the external line. It provides an automatic exchange.

[0007]

In order to solve the above-mentioned conventional problems, the present invention has a transmitter / receiver unit for a radio frequency band used in a premises and a transmitter / receiver unit for a radio frequency band used in a public network, and has a premises radio. When the fault information on the private automatic branch exchange is transmitted to the wireless telephone by the control data between the private automatic branch exchange and the wireless telephone transmitted on the frequency band,
Alternatively, when transmission / reception of control data becomes impossible, the wireless telephone shifts from the local frequency band to the public network frequency band, and the selection switch on the wireless telephone allows the user to arbitrarily select the outgoing frequency band. There is.

[0008]

With the above-described structure, the present invention enables an outside line to be transmitted from a wireless telephone even when the main unit of the private branch exchange is out of order or has a power failure, and when an external line connected to the private branch exchange is out of order. Not only that, even when the outside line connected to the private branch exchange is busy, the user can voluntarily select the transmission frequency band and transmit, thereby significantly improving the serviceability.

[0009]

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 a concept of a wireless telephone connected to a private branch exchange according to an embodiment of the present invention, FIG. 2 is a diagram showing a concept of a private automatic branch exchange device and an image of the wireless telephone, and FIG. 3 is a wireless telephone. 6 is a flow chart showing a frequency designation transmission procedure from the mobile phone, FIG. 4 is a flow chart showing a reception procedure to the wireless telephone, FIG. 5 is a flow chart showing a procedure for switching a frequency to be used when a failure occurs, and FIG.
Indicates a data transmission format between the private branch exchange and the wireless telephone.

In FIG. 1, reference numeral 10 is a radio transmitter / receiver unit for transmitting and receiving radio waves in the local frequency band, 11 is a voice path control unit in the local frequency band for performing interface control of the voice path, and 12 is a voice path in the local frequency band or a public network. A call path switch for switching to a frequency band, 13 for a control data conversion modem for performing D-A conversion of control data between a private branch exchange (not shown) and a wireless telephone, and 14 for a compander for removing radio noise. Reference numeral 15 is a speaker for transmitting the received voice, 1
6 is a microphone that is an input unit of the transmission voice, 17 is an antenna of a local frequency band, 18 is an antenna of a public network frequency band, 19
Is a wireless transmission / reception unit in the public network frequency band for transmitting / receiving radio waves in the public network frequency band, 20 is a voice path control unit in the public network frequency band for performing interface control of the voice path, and 21 is control data between the public network and the wireless telephone. A control data conversion modem for D-A conversion, 22 is a key operation unit that enables key input on the wireless telephone, 23 is a determination of the key pressed on the key operation unit 22, and reception from the modems 13 and 21. The control unit logically controls the control data.

In FIG. 2, reference numeral 24 is a private automatic branch exchange accommodating a radio telephone, 25 is an outside line control unit for performing interface control such as detection of an incoming call from an outside line and dial transmission to an outside line, and 26 is a distribution and an outgoing call control of an incoming call. And a control unit 27 for setting a communication path, etc., a base station control unit 27 for controlling an interface with the base station and receiving control data, etc.
Is an outside line connected to the outside line control unit 25, 29 is a base station for transmitting and receiving radio waves by an interface unit with the wireless telephone, 30 is an outline drawing of the wireless telephone, 31 is a public network frequency band at the time of calling and receiving. A public network frequency selection key to be selected, 32 is a local frequency selection key for selecting a local frequency band at the time of calling and receiving, and 33 is a public network.

The operation of the private branch exchange of this embodiment having the above components will be described below with reference to FIG. First, the case of making a frequency band designation call from the wireless telephone 30 will be described.
Calling is started by pressing the public network key 31 or the premises key 32 on the 0. When the control unit 23 receives a key input from the key operation unit 22 (step 1), the control unit 23 determines whether it is a call using the local frequency band.
It is determined whether the call is made using the public network frequency band (step 2). When it is determined that the call is made using the indoor frequency band (when the indoor key 32 is pressed),
The control unit 23 switches the switch 12 to the local frequency band (step 3), and the wireless transmission / reception unit 1 via the modem 13.
The control data tells the private automatic branch exchange 24 that the call is to be made. Then, according to the dial continuously input from the key operation unit 22, normal transmission control is performed via the wireless transmission / reception unit 10 (step 5). When it is determined that the call is made using the public network frequency band (when the public network key 31 is pressed), the control unit 23 causes the switch 1 to operate.
2 is switched to the public network frequency band (step 4), and the fact that the call is to be transmitted to the public network 33 is notified by the wireless transmitting / receiving unit 19 via the modem 21. After that, the normal transmission control is performed according to the reception dial as in the case of the local frequency band (step 5). With this transmission method, even when the local frequency band is busy, it is possible to make an emergency call by selecting the public network frequency band.

Next, the case where a call arrives at the wireless telephone 30 will be described with reference to FIG. First, the control unit 23 detects an incoming call in the local frequency band with the control information from the modem 13 or an incoming call from the public network frequency band with the control information from the modem 21 (steps 6 and 7). When the incoming call is from the local frequency band, the control unit 23
Displays the incoming call by blinking the LED of the indoor key 32 on the wireless telephone 30 (step 8), and sends out a bell sound indicating that the incoming call is from the indoor frequency band (step 9). When the incoming call is from the public network frequency band, the control unit 23 sets the LE of the public network key 31 on the wireless telephone 30.
An incoming call is displayed by blinking D (step 10), and a bell sound indicating that the incoming call is from the public network frequency band is transmitted (step 11).

Lastly, the fault countermeasure function will be described with reference to FIG. 5. The private branch exchange 24 and the wireless telephone 30 will be described.
Periodically transmits and receives control data via the base station 29 and the wireless transceiver 10 (step 12). When one control data transmission / reception is completed, the control unit 23 determines whether or not the data transmission is normally performed (step 13). If the data transmission is not normal, the control unit 23 counts the number of failures, and if the number is consecutive n times (eg, 8 times) or more (step 14), the private automatic branch exchange 24 The following control is performed assuming that there is a failure or power failure. First, since the subsequent transmission / reception control is not performed via the private automatic branch exchange 24, the communication path is switched to the public network frequency band control section by the switch 12 (step 17). Next, in order to indicate that the indoor frequency band cannot be used, the LED of the indoor key 32 is displayed.
Is displayed as a busy display (step 18). When the data transmission is normally completed, the received data from the private automatic branch exchange 12 is analyzed (step 15). If the received data is not the fault data (step 16), the process according to the received content is activated (step 19). If the received data is fault data (fault data such as an external line port abnormality) (step 16), subsequent call control is not performed via the private branch exchange 24.
2 switches the communication path to the voice path control unit 11 for public network frequency band control (step 18), and the LED of the indoor key 32 indicates that the indoor frequency band cannot be used.
Is displayed busy (step 18).

[0015]

As described above, according to the present invention, an outside line can be transmitted from a wireless telephone even in the case of a failure or a power failure of the private automatic branch exchange main body and a failure of an external line connected to the private automatic branch exchange. Not only in the event of a failure, but also when the outside line connected to the private branch exchange is busy, it is possible to select the transmission frequency band according to the user's will and make a transmission, which significantly improves the serviceability and has a great practical effect. There is something.

[Brief description of drawings]

FIG. 1 is a block diagram showing a concept of a wireless telephone connected to a private automatic branch exchange according to an embodiment of the present invention.

FIG. 2 is a diagram showing a concept of a private branch exchange and an image of a wireless telephone.

FIG. 3 is a flowchart showing a transmission procedure in a processing process of the private branch exchange.

FIG. 4 is a flowchart showing an incoming call procedure in a processing process of the private branch exchange.

FIG. 5 is a flowchart showing a frequency switching procedure in a processing process of the private branch exchange.

FIG. 6 is a block diagram showing the configuration of a conventional private automatic branch exchange.

[Explanation of symbols]

 10 wireless transmission / reception unit in the local frequency band 11 voice path control unit in the local frequency band 12 call path selector switch 13 control data conversion modem 14 compander 15 speaker 16 microphone 17 antenna in the local frequency band 18 public network frequency band antenna 19 public network Frequency band wireless transmitter / receiver unit 20 Public network frequency band voice path control unit 21 Control data conversion modem 22 Key operation unit 23 Control unit

Claims (4)

[Claims] 1. A wireless transmission / reception unit, which is connected to a private automatic branch exchange capable of exchange connection of a wireless telephone, transmits / receives radio waves in a radio frequency band used for voice and control data, and a voice path interface. Performs voice path interface with a local radio unit configured by a voice path control unit that performs the function, a control unit that controls functions on the wireless telephone, a wireless transmission / reception unit that transmits and receives radio waves in the radio frequency band in the public network. In a radio telephone equipped with both a public network radio unit having a voice path control unit, radio wave reception from the private automatic branch exchange may be impaired at the radio reception unit of the private radio unit of the radio telephone due to radio interference or a failure of the private automatic exchange main unit. When it becomes possible, the above-mentioned wireless telephone shifts to the frequency band connected to the public network, and the automatic premises exchange is configured so that it does not hinder subsequent outside line transmission. Machine. 2. When a failure occurs in an outside line connected to a private automatic branch exchange, the contents of the failure are notified to the wireless telephone from the private automatic branch exchange, and thereafter, the outside line transmission from the wireless telephone is performed through the public network. The private automatic branch exchange according to claim 1. 3. The private automatic branch exchange according to claim 1, wherein an incoming call can be received from both the private automatic branch exchange and the public network, and the incoming call type is notified by a bell sound on the wireless telephone and lighting on the display key. 4. The private automatic branch exchange according to claim 1, wherein when making a call from a wireless telephone, the private frequency band or the public network frequency band is designated in advance to make the call.