KR19990079839A - Wireless terminal access card in keyphone system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyphone system, and more particularly, to a wireless terminal access card in a keyphone system in which a wireless terminal access card is mounted in a universal slot to provide a digital European cordless telephone (DECT) service.

In the conventional key-phone system, there is no board to perform the DECT function in the part that handles the extension.

According to the present invention, an extension call can be made wirelessly by a key phone main device by inserting and using a wireless terminal connection card in a slot of a key phone system, so that an extension subscriber with frequent seat movement can conveniently talk.

Description

Wireless terminal access card in keyphone system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyphone system, and more particularly, to a wireless terminal access card in a keyphone system in which a wireless terminal access card is mounted in a universal slot to provide a digital European cordless telephone (DECT) service.

In general, a key phone system is used by a group or a private company to make a telephone call by accessing a trunk line or an extension line, and when connected to an extension line, the telephone line is automatically connected to an extension number added to the subscriber. It allows you to make phone calls directly without involving the circle.

As shown in FIG. 1, the key phone system includes a motherboard 100, which is a key phone main device, and a ring generator 19 for generating a ring signal under the control of the motherboard 100. And a power supply unit 20 for supplying power to the motherboard 100.

The motherboard 100 includes a slot unit 11, a digital backplane interface unit 12, a keyphone interface unit 13, a memory unit 14, a CPU 15, and a serial interface unit ( 16, the switching unit 17 and the sub function circuit unit 18 are provided.

The slot unit 11 inserts a card according to the purpose of the motherboard 100 to transfer the function of the card to the motherboard 100 through the digital backplane interface unit 12.

The digital backplane interface unit 12 multiplexes Pulse Code Modulation (PCM) data and High Level Data Link Control (HDLC) data and transmits the result to the slot unit 11 through the highway, and plugs each of the slot units 11 into each other. HDLC data applied from the card is applied to the CPU 15 and interfaces with the key phone interface unit 13.

The key phone interface unit 13 interfaces the digital backplane interface unit 12 and the digital key phone terminal to each other.

The memory unit 14 stores a program for processing the operation of the entire system, and temporarily stores data generated according to the operation of the program.

The CPU 15 controls the normal operation of each part of the system by using the program of the memory unit 14, performs data communication with other boards in which the CPU is embedded in the HDLC communication channel, and performs serial communication with the PC. The serial interface unit 16 is controlled.

The serial interface unit 16 is connected to the CPU 15, and the user can connect a PC or VDT (Video Display Terminal) to check the status of the system or to input the setting data required by the system. To match.

The switching unit 17 switches for the PCM data exchange operation in the system under the control of the CPU 15, for adjusting the gain and forming a conference call.

The sub function circuit 18 performs other main functions of the key phone main device, and plays a role of holding music, an external broadcasting function, an external alarm input port, and includes a DTMF (Dual Tone Mixed Frequency) sensing circuit.

Briefly looking at the operation of the key phone system configured as described above, all the voice data input and output to the key phone system is digitally processed and transferred to the desired place through the switching unit 17 and the digital backplane interface unit 12. In addition, the transmitted data is supported by the motherboard 100 and applied to a card suitable for each purpose provided in the keyphone interface 13 or the slot 11.

Accordingly, the data transmitted from the key phone interface unit 13 through the digital backplane interface unit 12 is transmitted to the digital key phone terminal, and the slot unit 11 is applied through the digital backplane interface unit 12. The data is applied to perform a function corresponding to each card.

That is, the slot part 11 has seven slots. In slot 1, slot 3 is used by inserting only a designated card, and slot 4 in slot 7 is called a universal slot which can be used by inserting other cards. The slot 1 is a voice processing card and an integrated service digital network (ISDN) card, the slot 2 is an extension card for public telephone connection, and the slot 3 is an ISDN basic rate interface (BRI) / primary rate interface (PRI) card and This card is for CO line connection.

In addition, the digital backplane interface unit 12 processes a state control with each card applied from the slot unit 11 and information required by the HDLC method, and the CPU 15 processes the corresponding information in the digital backplane interface unit. Control through (12).

In addition, the sub function circuit unit 18 processes functions required by the key phone system, and controls DTMF generation and detection of the key phone interface unit 13 and external broadcast and alarm detection relays.

On the other hand, the serial interface unit 16 allows the remote control via the external monitor or modem, such as the state of the key phone system.

As such, the voice data processed by the motherboard 100 or the cards inserted into the respective slots are connected to the trunk line or the extension line, and there is no board to perform the wireless call function in the portion corresponding to the extension line. It is inconvenient for extension subscribers with frequent seat shifts.

The present invention is to solve the problems as described above by inserting a wireless terminal connection card in the universal slot of the key phone system to enable an extension call wirelessly from the key phone host device, the convenience of wireless calls to the extension subscribers frequently move The purpose is to provide.

1 is a block diagram illustrating a key phone system.

2 is a block diagram illustrating a wireless terminal access card in a key phone system according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

21-1 to 21-4: Line driver 22-1, 22-2: EPLD

23-1 to 23-4: BMC 24: ADPCM section

25: echo cancellation section 26: PCM buffer section

27: buffer control unit 28: digital backplane interface unit

29: WTIB extension interface 30: Reset and watchdog

31: memory section 32: LED section

33: RS 232C section 34: address decoder

35: CPU

In order to achieve the above object, the present invention provides a key phone system, comprising: a line driver for driving data to and from a base station; A BMC supporting the DECT protocol of the transmission / reception data according to control data; An EPLD for processing timing of the transmission / reception data between the line driver and the BMC; An ADPCM unit for converting ADPCM data into PCM data and converting PCM data into ADPCM data; An echo removing unit for removing echoes of the data converted by the ADPCM unit; A digital backplane interface for interfacing the highway signal from the keyphone host; A PCM buffer unit for temporarily storing PCM data applied from the ADPCM unit and the digital backplane interface unit and outputting the PCM data according to a control signal; A buffer control unit controlling the output of the PCM data stored in the PCM buffer unit; A WTIB extension interface unit supporting an additional call to the BMC to extend the base station; A memory unit for storing the system-wide operation processing program, card identification number and necessary data; An LED unit which displays a card status and interrupts the BMC; RS 232C unit for monitoring the status of the card; A CPU controlling data transmission / reception with the base station using a program stored in the memory unit; A reset and watch dog for processing the reset and watch dog of the CPU; And an address decoder for selecting a peripheral portion of the BMC and the digital backplane interface unit by using the address combination of the CPU.

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

In the key phone system according to the present invention, a wireless terminal access card 200 for inserting a card into a universal slot may be used as a line driver 21-1 to 21-4 and an EPLD as shown in FIG. 2. (Electronic Programmable Logic Device; 22-1, 22-2), BMC (Burst Mode Controller) 23-1-23-4, ADPCM unit 24, echo rejection 25, PCM buffer unit (26), buffer control unit 27, digital backplane interface unit 28, WTIB (Wireless Terminal Interface Board) expansion interface unit 29, reset and watch dog 30, and memory unit 31 And an LED unit 32, an RS 232C unit 33, an address decoder 34, and a CPU 35.

The line drivers 21-1 to 21-4 transmit voice data applied through the EPLD 22-1 and 22-2 to each base station, and transmit the voice data applied from each base station to the EPLD. Send to (22-1, 22-2).

The EPLDs 22-1 and 22-2 process the timing of voice data between the BMCs 23-1 to 23-4 and the respective base stations, and each of the signals applied from the BMCs 23-1 to 23-4. Negative composite data is inserted at the guard time between voice data and transmitted to each base station through the line drivers 21-1 to 21-4, and the voice data and guard time received from each base station are transmitted. Inserted field strength data is separated and transmitted to the BMC (23-1 ~ 23-4).

The BMCs 23-1 to 23-4 transmit voice data received from the ADPCM unit 24 to the EPLDs 22-1 and 22-2 under the control of the CPU 35. The DECT protocol for transmitting the voice data applied from 22-1 and 22-2 to the ADPCM unit 24 is processed.

The ADPCM unit 24 converts the ADPCM data received from the BMCs 23-1 to 23-4 into PCM data and applies the PCM buffer unit 26 to the PCM buffer unit 26. The PCM buffer unit 26 applies the PCM data. The data is converted into ADPCM data and applied to each BMC 23-1 to 23-4.

The echo removing unit 25 removes echoes of the digital voice data generated by the ADPCM unit 24 under the control of the CPU 35.

The PCM buffer unit 26 temporarily stores PCM data applied from the digital backplane interface unit 28 or the ADPCM unit 24, and under the control of the buffer control unit 27, the ADPCM unit 24 or the The PCM data is output to the digital backplane interface unit 28, respectively.

The buffer control unit 27 controls and processes the output of the PCM data stored in the PCM buffer unit 26.

The digital backplane interface unit 28 transmits the PCM data applied from the key phone main unit to the PCM buffer unit 26 under the control of the CPU 35, and transfers the PCM data applied from the PCM buffer unit 26 to the key phone main unit. send.

The WTIB extension interface unit 29 supports additional calls to the BMCs 23-1 to 23-4 so that the base station can be extended and used.

The reset and watchdog 30 processes the reset and watchdog of the CPU 35.

The memory unit 31 stores a system-wide operation processing program, a card identification number, and necessary data.

The LED unit 32 displays the status of the card and interrupts the BMCs 23-1 to 23-4.

The RS 232C unit 33 supports the system operator to monitor the operation state of the wireless terminal access card 200 by using an external device.

The address decoder 34 selects the peripheral parts of the BMCs 23-1 to 23-4 and the digital backplane interface unit 28 using an address combination of the CPU 35.

Referring to the data processing operation of the wireless terminal connection card 200 in the key phone system according to the present invention configured as described above are as follows.

The wireless terminal access card 200 is a board mounted on the main device of the key phone system to make a call using a wireless terminal, and one wireless terminal access card 200 may be used in one system. The access card 200 can basically configure a cell, supports up to five simultaneous calls per cell, and additionally uses the WTIB extension interface unit 29 in the wireless terminal access card 200. It can be extended to extend support for concurrent calls.

First, if a user briefly looks at performing an initial operation for a call to a wireless terminal, when each base station receives and authorizes a connection request signal from the wireless terminal by the DECT protocol, the corresponding wireless terminal access card 200 Transmits a connection request signal to the motherboard provided in the keyphone main unit.

Accordingly, the mother phone of the key device generates a dial tone and transmits the dial tone to the wireless terminal access card 200. The wireless terminal access card 200 receives the dial tone and transmits the dial tone to the wireless terminal user through the base station. do.

Then, when the user presses the other party's telephone number using the terminal, the wireless terminal access card 200 likewise applies the telephone number received from the base station to the motherboard of the key phone main unit.

In addition, the motherboard of the key phone main unit converts the telephone number received through the wireless terminal access card 200 into a DTMF signal, analyzes it, generates a call signal, sends it to the other party's phone, and forms a call path when the other party answers. Allow them to talk.

Then, a process of receiving and processing voice data of a wireless terminal through the base station to the wireless terminal access card 200 will be described. Line drivers 21-1 to 21-4 provided in the wireless terminal access card 200 will be described. ) Transmits the voice data received through each base station to EPLD 22-1 and 22-2.

Accordingly, the EPLDs 22-1 and 22-2 transmit the applied voice data between the digital backplane interface unit 28 and the ADPCM unit 24, and the BMCs 23-1 to 23-4 and the ADPCM unit ( It is generated as a frame for data transmission between the 24) and applied to the BMC (23-1 ~ 23-4).

Accordingly, the BMCs 23-1 to 23-4 analyze data applied from the EPLDs 22-1 and 22-2 under the control of the CPU 35 and apply the same to the ADPCM unit 24. do.

At this time, the ADPCM unit 24 converts the ADPCM data applied from the BMCs 23-1 to 23-4 into PCM data and applies it to the echo removing unit 25, and the echo removing unit 25 is The echo of the applied voice data is removed and then applied to the PCM buffer unit 26.

Then, the PCM buffer unit 26 temporarily stores the echo canceled voice data applied from the ADPCM unit 24 and digitally connects all common boards in the system under the control of the buffer controller 27. Output to the digital backplane interface unit 28.

The digital backplane interface unit 28 transmits the voice data applied from the PCM buffer unit 26 to the motherboard of the key phone main unit through the PCM highway.

However, there are three digital backplane interface units 28 in the wireless terminal access card 200. Since each of the digital backplane interface units 28 supports 12 voice channels, 32 voice channels can be used simultaneously, and the CPU 35 controls the CPU 35. There are 64 registers that operate accordingly.

On the other hand, the BMCs 23-1 to 23-4 exchange control data with the CPU 35 regardless of whether or not the voice data is processed. At this time, if the CPU 35 does not operate normally, reset and watch are performed. The dog 30 generates a watch dog to reset the CPU 35.

The CPU 35 performs normal voice data transmission with the base station using a program stored in the memory unit 31, and the base station according to the DECT protocol in the BMCs 23-1 to 23-4. Call switching is performed so that normal data exchange with the system is performed, and the LED unit 33 and the RS 232C unit 33 are controlled to provide a system operator to check the processing state of voice data.

In addition, the wireless terminal access card 200 is stored in the memory unit 31 when a user wants to register and use a specific wireless terminal while the registration information for a plurality of wireless terminals is stored in the memory unit 31. If the registered information and the registered information of a specific terminal do not match, use of the corresponding wireless terminal is prohibited. That is, the user should always register the terminal to match the wireless terminal registration information stored in the memory unit 31.

As such, the wireless terminal access card 200 is used by plugging into a universal slot, and provides a DECT service in a key phone host device, thereby providing convenience for an extension subscriber having a large number of seat movements by wirelessly making an extension call.

As described above, by using the wireless terminal connection card by inserting the wireless terminal connection card into the slot part of the key phone system to enable the extension call wirelessly from the key phone main device, the extension subscriber with frequent seat movement can conveniently talk.

Claims (1)

In a key phone system, Line drivers 21-1 to 21-4 for driving transmission / reception data with each base station; BMCs 23-1 to 23-4 supporting the DECT protocol of the transmission / reception data according to control data; EPLDs 22-1 and 22-2 for processing timing of the transmission / reception data between the line drivers 21-1 to 21-4 and the BMCs 23-1 to 23-4; An ADPCM unit 24 for converting ADPCM data into PCM data and converting PCM data into ADPCM data; An echo removing unit 25 for removing echoes of the data converted by the ADPCM unit 24; A digital backplane interface 28 for interfacing the highway signal from the keyphone host; A PCM buffer unit 26 for temporarily storing PCM data applied from the ADPCM unit 24 and the digital backplane interface unit 28 and outputting the PCM data according to a control signal; A buffer control unit 27 for controlling the output of the PCM data stored in the PCM buffer unit 26; A WTIB extension interface unit 29 for supporting an additional call to the BMCs 23-1 to 23-4 to expand the base station; A memory unit 31 which stores an operation processing program, a card identification number, and necessary data of the entire system; An LED unit 32 for displaying the card status and interrupt processing of the BMCs 23-1 to 23-4; RS 232C unit 33 for monitoring the status of the card; A CPU (35) for controlling a data transmission / reception operation with the base station using a program stored in the memory unit (31); A reset and watch dog 30 for processing the reset and watch dog of the CPU 35; A key phone system, comprising: an address decoder 34 for selecting peripheral portions of the BMCs 23-1 to 23-4 and the digital backplane interface unit 28 by using an address combination of the CPU 35; Wireless terminal access card in.