KR100397331B1 - apparatus and method for extension change in terminal type WLL terminal - Google Patents

Abstract

The present invention relates to an apparatus and a method for switching an extension of a terminal to which an extension can be easily switched by adding an extension switch to the terminal. The apparatus for switching an extension of a terminal according to the present invention converts a received high frequency signal into an intermediate frequency signal. A frequency converter; A modulator / demodulator for demodulating the converted modulated signal of the frequency converter, a vocoder unit for converting a signal between the analog baseband signal and a PCM (Pulse Code Modulaton) signal, and a DTMF receiver A mobile station modem (MSM) unit for generating a control signal for controlling the extension switch unit to switch a call to a corresponding receiver according to the information; A codec unit converting a digital signal of the vocoder into an analog signal; A Dual Tone Muiti Frequency (DTMF) receiver which analyzes the dial dialed by the caller to find out the desired extension number and transmits it to the MSM unit; A subscriber line interface circuit (SLIC) unit comprising a ring generator for generating a ring signal for driving a telephone ringer; By including a plurality of switches, and an internal switch consisting of an input port of the control signal for each switch can be turned on / off, it is necessary to install a separate keyphone system by adding an extension switch to the terminal type WLL terminal No cost can be saved.

Description

Apparatus and method for extension change in terminal type WLL terminal}

The present invention relates to an extension switching function in a terminal type wireless subscriber network terminal, and more particularly, to an extension switching apparatus and method for a terminal for easily switching the extension by adding an extension switch to the terminal.

In general, a terminal type WLL (wireless local loop) terminal adds a subscriber line circuit of a landline telephone company, that is, a subscriber line interface circuit (SLIC) to a code division multiple access (CDMA) mobile phone (PCS or cellular). 1 can be used by connecting a general landline or fax (fax).

In other words, just as a telephone or fax is connected to a landline telephone line, a general landline telephone or fax is connected to a terminal type WLL terminal, and a SLIC circuit is added to the cellular phone so that it can be used.

2 is a block diagram of a conventional terminal type wireless subscriber network terminal, and as shown therein, a frequency converter 110 for converting a received high frequency signal into an intermediate frequency signal, and the frequency converter 110 converted into A modulator / demodulator 120 for demodulating a modulated signal, and a vocoder unit for converting a signal between an analog baseband signal and a pulse code modulaton signal of the modulator / demodulator 120. 124, the mobile station modem 120 for generating a control signal to connect the call to the corresponding receiver according to the information informed by the DTMF receiver 140, and the digital signal of the vocoder 124 is analog. A codec unit 130 for converting a signal, a dial tone dialed by the caller, a DTMF (Dual Tone Muiti Frequency) receiver 140 for determining the desired extension number and transmitting it to the MSM 120; Ring signal that drives the telephone ringer To consist of a ring generator SLIC (Subscriber Line Interface Circuit) (150) consisting of production, it will be described the operation thereof, the process follows.

When a caller makes a call, an outgoing signal is received by the base station through the base station. The received high frequency outgoing signal is converted into an intermediate frequency through the frequency converter 110, and the modulated intermediate frequency is code division multiple access (CDMA). The demodulation / demodulation unit 120 is demodulated in a manner, and the vocoder 124 converts a signal between the analog baseband signal of the modulation / demodulation unit 120 and the PCM signal.

In addition, the GPIO 126 outputs a ring generation control signal to the SLIC 150, the codec 130 converts the digital signal of the vocoder 124 into an analog signal, the DTMF receiver 140 is the codec 130 An analog DTMF signal is received and converted into 4-bit parallel digital data DTMF_DATA [0: 3] and output to the MSM 120.

On the other hand, the SLIC 150 transmits the ring signal of the GPIO 126 to the other party to enable the call. At this time, the SLIC 150 detects the off-hook signal of the other party and transmits the detected signal to the MSM 120. Will print

As such, in the conventional terminal type WLL terminal, it is possible to connect and use several telephones or faxes simultaneously, but the extension switching function is not supported.

Accordingly, the present invention has been made to solve the above problems, and an object thereof is to enable extension switching by adding an extension switch to a terminal type WLL terminal.

1 is a schematic diagram of a conventional terminal type wireless subscriber network terminal.

2 is a detailed configuration diagram of a conventional terminal type wireless subscriber network terminal.

Figure 3 is a schematic diagram of a terminal type wireless subscriber network terminal applied to the present invention.

4 is a detailed configuration diagram of a terminal type wireless subscriber network terminal applied to the present invention.

5 is a flowchart illustrating an extension switching method of a terminal type wireless subscriber network terminal applied to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: WLL terminal 110: frequency converter

120: Mobile Station Modem (MSM)

122: variation modulation unit 124: vocoder

126: General Purpose Input and Output MSM ports

130: codec 140: DTMF receiver

150: Subscriber Line Interface Circuit (SLIC)

200: extension switch

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Extension apparatus of the terminal applied to the present invention,

A frequency converting unit converting the received high frequency signal into an intermediate frequency signal; A modulation / demodulation unit for demodulating the converted modulated signal of the frequency converter, a vocoder unit for converting a signal between an analog baseband signal and a PCM (Pulse Code Modulaton) signal, and information provided by a DTMF receiver. MSM (Mobile Station Modem) unit including a GPIO for generating a control signal for controlling the extension switch unit to switch the call to the corresponding recipient;

A codec unit converting a digital signal of the vocoder into an analog signal;

A Dual Tone Muiti Frequency (DTMF) receiver which analyzes the dial pressed by the caller to find out the desired extension number and transmits it to the MSM unit;

A subscriber line interface circuit (SLIC) unit comprising a ring generator for generating a ring signal for driving a telephone ringer;

And an extension switch unit connected to the slick unit and including an input port of a control signal capable of turning on / off each switch and a plurality of switches.

The input port is composed of a connector.

The SLIC delivers a TIP signal to the station switch.

Extension switching method of the terminal applied to the present invention,

Sending an extension indication tone signal to the caller when the hook flash is generated by the caller's extension request;

Checking whether DTMF data is transmitted from the sender;

Turning off the other switches except for a switch capable of connecting a call to a corresponding receiver according to the transmitted DTMF signal when the DTMF data is transmitted;

Stopping the transmitted extension indication tone signal after the remaining switch off and generating a ring signal to the called party;

If the receiving mode of the receiver is in the on-hook state, the switches other than the switch of the receiver remain in the off state; if the receiving mode of the receiver is in the off-hook state, turning on the remaining switches and ending the step; It is made to include.

First, the technical content mentioned in the prior art will be omitted and described.

4 is a configuration diagram of a terminal type wireless subscriber network terminal applied to the present invention, and as shown therein, a frequency converter 110 for converting a received high frequency signal into an intermediate frequency signal, and the frequency converter 110. Modulation / demodulation unit 120 for demodulating the converted modulated signal of the vocoder unit 124 for converting the signal between the analog baseband signal and the PCM signal of the modulation / demodulation unit 120, DTMF receiver 140 The mobile station modem unit 120 generates a control signal for controlling the extension switch unit 200 to switch the call to the corresponding receiver according to the information, and the digital signal of the vocoder unit 124 is an analog signal. A codec unit 130 for converting the signal to a mobile station, a dial tone pressed by the caller to find a desired extension number, and a DTMF (Dual Tone Muiti Frequency) receiver 140 transmitting the same to the MSM unit, and a ring signal for driving a telephone ringer. To It comprises a SLIC unit 150 consisting of a ring generator to generate and an extension switch 200 connected to the slick unit and including a switch and an input port of a control signal for turning on / off each switch, Referring to Figure 3 as follows.

Upon reception, all the switches SW0 to SW4 in the station switch 200 are in an ON state. That is, CON_SW [0: 4] = 11111.

The extension conversion process from RJ11 / 0 to RJ11 / 1 is as follows.

After recognizing the HOOK FLASH signal from RJ11 / 0 of FIG. 3, the CPI not shown starts an extension software routine, and the vocoder 124 generates an extension indication tone and transmits it to the caller. Mute the transmission path (Tx path) of 130. At this time, the switch state is CON_SW [0: 4] = 10000.

In addition to the hook flash signal from the SLIC 150, a DTMF signal of a special character button (eg, #, *, etc.) of the dial pad may be used.

The extension indication tone is a signal informing the caller that the recipient is performing an extension.

Recognize DTMF data of dial button [1] pressed by RJ11 / 0, turn off all switches except SW0 and SW1 (RJ11 / 1) (CON_SW [0: 4] = 11000), and extinguish the extension tone. Off), and mute the Tx path of the codec 130 and generate a ring signal in the ring generator of the SLIC 150.

If the DTMF data input does not occur within a certain time, terminate the extension software routine and reconnect RJ11 / 0 to the caller. At this time, the switch state is CON_SW [0: 4] = 11111.

In addition, it detects the off hook of RJ11 / 1 which received the ring signal and turns on the remaining switches again. At this time, the switch state is CON_SW [0: 4] = 11111.

If off-hook does not occur within a certain time, terminate the extension software routine and reconnect RJ11 / 0 to the caller. At this time, the switch state is CON_SW [0: 4] = 11111.

DTMF_DATA [0: 3] is digital data corresponding to the analog DTMF signal converted by the DTMF receiver 140.

The CPI, not shown, performs software items necessary for the extension switching function according to the extension switching software routine, which is stored in a flash memory (ROM) not shown.

The hook flash becomes a state transition (low → high → low) of DET_OFF HOOK that occurs while the hook button is pressed for a predetermined time in a call state, and the call should not be disconnected.

The ring signal is generated when the output control signal CON_RING_GEN of the MSM 120 that controls whether the ring generator of the ring generator of the SLIC unit 150 is 1 and the ring signal is extinguished when 0 is zero.

The CON_SW [0: 4] is a GPIO 126 output control signal of the MSM 120 that can turn on / off the switches inside the station switch.

When the vocoder 124 of the MSM 120 generates an extension indication tone, the caller hears this sound and knows that the caller is performing the extension on the receiver side and waits for the completion of the extension.

In addition, the terminal-type WLL applied to the present invention, like a general landline telephone, is a signal that informs the WLL terminal that the user performs other functions, not a call, when the user is on hook for less than 1000 ms. This is called a hook flash signal.

If the phone stays on hook for more than 1000ms, the call will be disconnected.

In addition, the DET_OFF HOOK signal goes low during off-hook and goes high when on-hook. This indicates a state transition of the DET_OFF HOOK and is not a state of hook flash.

In addition to the hook flash signal from the SLIC 150, DTMF signals of special character buttons (eg, #, *, etc.) of the dial pad may be used.

In addition, the DTMF receiver 140 receives analog DTMF signals generated when a button on the dial pad is pressed in the WLL terminal and converts them into 4-bit parallel digital data. In this case, the target number (1: RJ11 / When 1) is displayed by pressing a dial button, the data is converted to data and notified to the MSM 120.

SLIC 150 is a set of circuits constituting the subscriber line of the telephone exchange, which can be implemented as a single chip and includes a ring generator for generating a ring signal for driving the telephone ringer.

Therefore, the extension switch can be controlled by appropriately controlling the extension switch.

5 is a flowchart illustrating a method of switching an extension of a terminal type wireless subscriber network terminal applied to the present invention.

When the hook flash is generated by the caller's extension request, the caller of the extension indication tone signal is transmitted to the caller.

If the caller does not recognize the DTMF data of the dial button pressed, the ring is in the state of disappearing the ring. When the DTMF data is recognized, all the switches except for the receiver side are turned off. (S30 to S50)

After the remaining switch off, the extension tone indicator is turned off and a ring signal is generated (S60).

If the receive mode is in the on-hook state, the remaining switches except for the received switch are in the off state. If the receive mode is in the off-hook state, the remaining switches in the off state are turned on and then terminated.

As described above, according to the present invention, it is not necessary to install a separate key phone system by adding an extension switch to the terminal type WLL terminal, thereby reducing the cost.

Claims (4)

A frequency converting unit converting the received high frequency signal into an intermediate frequency signal; A modulation / demodulation unit for demodulating the converted modulated signal of the frequency converter, a vocoder unit for converting a signal between an analog baseband signal and a PCM (Pulse Code Modulaton) signal, and information provided by a DTMF receiver. A mobile station modem (MSM) unit including a GPIO unit for generating a control signal for controlling the extension switch unit to switch a call to a corresponding receiver; A codec unit converting a digital signal of the vocoder into an analog signal; A Dual Tone Muiti Frequency (DTMF) receiver which analyzes the dial pressed by the caller to find out the desired extension number and transmits it to the MSM unit; A subscriber line interface circuit (SLIC) unit comprising a ring generator for generating a ring signal for driving a telephone ringer; And an internal switch unit connected to the slick unit and including a plurality of switches and an input port of a control signal capable of turning on / off each of the switches. The apparatus of claim 1, wherein the input port comprises a connector. delete Sending an extension indication tone signal to the caller when the hook flash is generated by the caller's extension request; Checking whether DTMF data is transmitted from the sender; Turning off the other switches except for a switch capable of connecting a call to a corresponding receiver according to the transmitted DTMF signal when the DTMF data is transmitted; Stopping the transmitted extension indication tone signal after the remaining switch off and generating a ring signal to a corresponding receiver; If the receiving mode of the receiver is in the on-hook state, the switches other than the switch of the receiver remain in the off state; if the receiving mode of the receiver is in the off-hook state, turning on the remaining switches and ending the step; Extension switching method of the terminal comprising a.